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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
Jeff Kirsher9cb00072013-12-06 06:28:46 -080017 * along with this program; if not, see <http://www.gnu.org/licenses/>.
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 */
19
20/*
21 * This is a generic "USB networking" framework that works with several
David Brownell090ffa92005-08-31 09:54:50 -070022 * kinds of full and high speed networking devices: host-to-host cables,
23 * smart usb peripherals, and actual Ethernet adapters.
Linus Torvalds1da177e2005-04-16 15:20:36 -070024 *
David Brownell090ffa92005-08-31 09:54:50 -070025 * These devices usually differ in terms of control protocols (if they
26 * even have one!) and sometimes they define new framing to wrap or batch
27 * Ethernet packets. Otherwise, they talk to USB pretty much the same,
28 * so interface (un)binding, endpoint I/O queues, fault handling, and other
29 * issues can usefully be addressed by this framework.
30 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
32// #define DEBUG // error path messages, extra info
33// #define VERBOSE // more; success messages
34
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <linux/init.h>
37#include <linux/netdevice.h>
38#include <linux/etherdevice.h>
Peter Holik03ad0322009-04-18 07:24:17 +000039#include <linux/ctype.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include <linux/ethtool.h>
41#include <linux/workqueue.h>
42#include <linux/mii.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include <linux/usb.h>
Jussi Kivilinna3692e942008-01-26 00:51:45 +020044#include <linux/usb/usbnet.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090045#include <linux/slab.h>
Andy Shevchenkofd1f1702010-07-23 03:18:08 +000046#include <linux/kernel.h>
Ming Leib0786b42010-11-01 07:11:54 -070047#include <linux/pm_runtime.h>
David Brownellf29fc252005-08-31 09:52:31 -070048
49#define DRIVER_VERSION "22-Aug-2005"
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
51
52/*-------------------------------------------------------------------------*/
53
54/*
55 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max.
56 * Several dozen bytes of IPv4 data can fit in two such transactions.
57 * One maximum size Ethernet packet takes twenty four of them.
58 * For high speed, each frame comfortably fits almost 36 max size
59 * Ethernet packets (so queues should be bigger).
David Brownellf29fc252005-08-31 09:52:31 -070060 *
Ming Leia88c32a2013-07-25 13:47:53 +080061 * The goal is to let the USB host controller be busy for 5msec or
62 * more before an irq is required, under load. Jumbograms change
63 * the equation.
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 */
Ming Leia88c32a2013-07-25 13:47:53 +080065#define MAX_QUEUE_MEMORY (60 * 1518)
66#define RX_QLEN(dev) ((dev)->rx_qlen)
67#define TX_QLEN(dev) ((dev)->tx_qlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
Linus Torvalds1da177e2005-04-16 15:20:36 -070069// reawaken network queue this soon after stopping; else watchdog barks
70#define TX_TIMEOUT_JIFFIES (5*HZ)
71
72// throttle rx/tx briefly after some faults, so khubd might disconnect()
73// us (it polls at HZ/4 usually) before we report too many false errors.
74#define THROTTLE_JIFFIES (HZ/8)
75
Linus Torvalds1da177e2005-04-16 15:20:36 -070076// between wakeups
77#define UNLINK_TIMEOUT_MS 3
78
79/*-------------------------------------------------------------------------*/
80
81// randomly generated ethernet address
82static u8 node_id [ETH_ALEN];
83
Linus Torvalds1da177e2005-04-16 15:20:36 -070084static const char driver_name [] = "usbnet";
85
86/* use ethtool to change the level for any given device */
87static int msg_level = -1;
88module_param (msg_level, int, 0);
89MODULE_PARM_DESC (msg_level, "Override default message level");
90
Linus Torvalds1da177e2005-04-16 15:20:36 -070091/*-------------------------------------------------------------------------*/
92
Linus Torvalds1da177e2005-04-16 15:20:36 -070093/* handles CDC Ethernet and many other network "bulk data" interfaces */
David Brownell2e55cc72005-08-31 09:53:10 -070094int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070095{
96 int tmp;
97 struct usb_host_interface *alt = NULL;
98 struct usb_host_endpoint *in = NULL, *out = NULL;
99 struct usb_host_endpoint *status = NULL;
100
101 for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
102 unsigned ep;
103
104 in = out = status = NULL;
105 alt = intf->altsetting + tmp;
106
107 /* take the first altsetting with in-bulk + out-bulk;
108 * remember any status endpoint, just in case;
Justin P. Mattock70f23fd2011-05-10 10:16:21 +0200109 * ignore other endpoints and altsettings.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 */
111 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
112 struct usb_host_endpoint *e;
113 int intr = 0;
114
115 e = alt->endpoint + ep;
116 switch (e->desc.bmAttributes) {
117 case USB_ENDPOINT_XFER_INT:
Luiz Fernando N. Capitulinofc6e2542006-10-26 13:03:01 -0300118 if (!usb_endpoint_dir_in(&e->desc))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 continue;
120 intr = 1;
121 /* FALLTHROUGH */
122 case USB_ENDPOINT_XFER_BULK:
123 break;
124 default:
125 continue;
126 }
Luiz Fernando N. Capitulinofc6e2542006-10-26 13:03:01 -0300127 if (usb_endpoint_dir_in(&e->desc)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 if (!intr && !in)
129 in = e;
130 else if (intr && !status)
131 status = e;
132 } else {
133 if (!out)
134 out = e;
135 }
136 }
137 if (in && out)
138 break;
139 }
140 if (!alt || !in || !out)
141 return -EINVAL;
142
Joe Perches8e95a202009-12-03 07:58:21 +0000143 if (alt->desc.bAlternateSetting != 0 ||
144 !(dev->driver_info->flags & FLAG_NO_SETINT)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber,
146 alt->desc.bAlternateSetting);
147 if (tmp < 0)
148 return tmp;
149 }
David Brownellcb1cebb2007-02-15 18:52:30 -0800150
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 dev->in = usb_rcvbulkpipe (dev->udev,
152 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
153 dev->out = usb_sndbulkpipe (dev->udev,
154 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
155 dev->status = status;
156 return 0;
157}
David Brownell2e55cc72005-08-31 09:53:10 -0700158EXPORT_SYMBOL_GPL(usbnet_get_endpoints);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
Peter Holik03ad0322009-04-18 07:24:17 +0000160int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress)
161{
162 int tmp, i;
163 unsigned char buf [13];
164
165 tmp = usb_string(dev->udev, iMACAddress, buf, sizeof buf);
166 if (tmp != 12) {
167 dev_dbg(&dev->udev->dev,
168 "bad MAC string %d fetch, %d\n", iMACAddress, tmp);
169 if (tmp >= 0)
170 tmp = -EINVAL;
171 return tmp;
172 }
173 for (i = tmp = 0; i < 6; i++, tmp += 2)
174 dev->net->dev_addr [i] =
Andy Shevchenkofd1f1702010-07-23 03:18:08 +0000175 (hex_to_bin(buf[tmp]) << 4) + hex_to_bin(buf[tmp + 1]);
Peter Holik03ad0322009-04-18 07:24:17 +0000176 return 0;
177}
178EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr);
179
tom.leiming@gmail.com24ead292012-06-11 15:19:44 +0000180static void intr_complete (struct urb *urb)
181{
182 struct usbnet *dev = urb->context;
183 int status = urb->status;
184
185 switch (status) {
186 /* success */
187 case 0:
188 dev->driver_info->status(dev, urb);
189 break;
190
191 /* software-driven interface shutdown */
192 case -ENOENT: /* urb killed */
193 case -ESHUTDOWN: /* hardware gone */
194 netif_dbg(dev, ifdown, dev->net,
195 "intr shutdown, code %d\n", status);
196 return;
197
198 /* NOTE: not throttling like RX/TX, since this endpoint
199 * already polls infrequently
200 */
201 default:
202 netdev_dbg(dev->net, "intr status %d\n", status);
203 break;
204 }
205
tom.leiming@gmail.com24ead292012-06-11 15:19:44 +0000206 status = usb_submit_urb (urb, GFP_ATOMIC);
207 if (status != 0)
208 netif_err(dev, timer, dev->net,
209 "intr resubmit --> %d\n", status);
210}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211
212static int init_status (struct usbnet *dev, struct usb_interface *intf)
213{
214 char *buf = NULL;
215 unsigned pipe = 0;
216 unsigned maxp;
217 unsigned period;
218
219 if (!dev->driver_info->status)
220 return 0;
221
222 pipe = usb_rcvintpipe (dev->udev,
223 dev->status->desc.bEndpointAddress
224 & USB_ENDPOINT_NUMBER_MASK);
225 maxp = usb_maxpacket (dev->udev, pipe, 0);
226
227 /* avoid 1 msec chatter: min 8 msec poll rate */
228 period = max ((int) dev->status->desc.bInterval,
229 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3);
230
Christoph Lametere94b1762006-12-06 20:33:17 -0800231 buf = kmalloc (maxp, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 if (buf) {
Christoph Lametere94b1762006-12-06 20:33:17 -0800233 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 if (!dev->interrupt) {
235 kfree (buf);
236 return -ENOMEM;
237 } else {
238 usb_fill_int_urb(dev->interrupt, dev->udev, pipe,
239 buf, maxp, intr_complete, dev, period);
tom.leiming@gmail.com720f3d72012-04-29 22:51:02 +0000240 dev->interrupt->transfer_flags |= URB_FREE_BUFFER;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 dev_dbg(&intf->dev,
242 "status ep%din, %d bytes period %d\n",
243 usb_pipeendpoint(pipe), maxp, period);
244 }
245 }
David Brownell18ab4582007-05-25 12:31:32 -0700246 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247}
248
Dan Williams6eecdc52013-05-06 11:29:23 +0000249/* Submit the interrupt URB if not previously submitted, increasing refcount */
250int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags)
251{
252 int ret = 0;
253
254 WARN_ON_ONCE(dev->interrupt == NULL);
255 if (dev->interrupt) {
256 mutex_lock(&dev->interrupt_mutex);
257
258 if (++dev->interrupt_count == 1)
259 ret = usb_submit_urb(dev->interrupt, mem_flags);
260
261 dev_dbg(&dev->udev->dev, "incremented interrupt URB count to %d\n",
262 dev->interrupt_count);
263 mutex_unlock(&dev->interrupt_mutex);
264 }
265 return ret;
266}
267EXPORT_SYMBOL_GPL(usbnet_status_start);
268
269/* For resume; submit interrupt URB if previously submitted */
270static int __usbnet_status_start_force(struct usbnet *dev, gfp_t mem_flags)
271{
272 int ret = 0;
273
274 mutex_lock(&dev->interrupt_mutex);
275 if (dev->interrupt_count) {
276 ret = usb_submit_urb(dev->interrupt, mem_flags);
277 dev_dbg(&dev->udev->dev,
278 "submitted interrupt URB for resume\n");
279 }
280 mutex_unlock(&dev->interrupt_mutex);
281 return ret;
282}
283
284/* Kill the interrupt URB if all submitters want it killed */
285void usbnet_status_stop(struct usbnet *dev)
286{
287 if (dev->interrupt) {
288 mutex_lock(&dev->interrupt_mutex);
289 WARN_ON(dev->interrupt_count == 0);
290
291 if (dev->interrupt_count && --dev->interrupt_count == 0)
292 usb_kill_urb(dev->interrupt);
293
294 dev_dbg(&dev->udev->dev,
295 "decremented interrupt URB count to %d\n",
296 dev->interrupt_count);
297 mutex_unlock(&dev->interrupt_mutex);
298 }
299}
300EXPORT_SYMBOL_GPL(usbnet_status_stop);
301
302/* For suspend; always kill interrupt URB */
303static void __usbnet_status_stop_force(struct usbnet *dev)
304{
305 if (dev->interrupt) {
306 mutex_lock(&dev->interrupt_mutex);
307 usb_kill_urb(dev->interrupt);
308 dev_dbg(&dev->udev->dev, "killed interrupt URB for suspend\n");
309 mutex_unlock(&dev->interrupt_mutex);
310 }
311}
312
David Brownell2e55cc72005-08-31 09:53:10 -0700313/* Passes this packet up the stack, updating its accounting.
314 * Some link protocols batch packets, so their rx_fixup paths
315 * can return clones as well as just modify the original skb.
316 */
317void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318{
319 int status;
320
Jussi Kivilinna7834ddb2009-08-11 22:57:16 +0300321 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) {
322 skb_queue_tail(&dev->rxq_pause, skb);
323 return;
324 }
325
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 skb->protocol = eth_type_trans (skb, dev->net);
Herbert Xu79638372009-06-29 16:53:28 +0000327 dev->net->stats.rx_packets++;
328 dev->net->stats.rx_bytes += skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
Joe Perchesa475f602010-02-17 10:30:24 +0000330 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n",
331 skb->len + sizeof (struct ethhdr), skb->protocol);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 memset (skb->cb, 0, sizeof (struct skb_data));
Michael Rieschf9b491e2011-09-29 04:06:26 +0000333
334 if (skb_defer_rx_timestamp(skb))
335 return;
336
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 status = netif_rx (skb);
Joe Perchesa475f602010-02-17 10:30:24 +0000338 if (status != NET_RX_SUCCESS)
339 netif_dbg(dev, rx_err, dev->net,
340 "netif_rx status %d\n", status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341}
David Brownell2e55cc72005-08-31 09:53:10 -0700342EXPORT_SYMBOL_GPL(usbnet_skb_return);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343
Ming Leia88c32a2013-07-25 13:47:53 +0800344/* must be called if hard_mtu or rx_urb_size changed */
345void usbnet_update_max_qlen(struct usbnet *dev)
346{
347 enum usb_device_speed speed = dev->udev->speed;
348
349 switch (speed) {
350 case USB_SPEED_HIGH:
351 dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size;
352 dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu;
353 break;
Ming Lei452c4472013-07-25 13:47:54 +0800354 case USB_SPEED_SUPER:
355 /*
356 * Not take default 5ms qlen for super speed HC to
357 * save memory, and iperf tests show 2.5ms qlen can
358 * work well
359 */
360 dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size;
361 dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu;
362 break;
Ming Leia88c32a2013-07-25 13:47:53 +0800363 default:
364 dev->rx_qlen = dev->tx_qlen = 4;
365 }
366}
367EXPORT_SYMBOL_GPL(usbnet_update_max_qlen);
368
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370/*-------------------------------------------------------------------------
371 *
372 * Network Device Driver (peer link to "Host Device", from USB host)
373 *
374 *-------------------------------------------------------------------------*/
375
Stephen Hemminger777baa42009-03-20 19:35:54 +0000376int usbnet_change_mtu (struct net_device *net, int new_mtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377{
378 struct usbnet *dev = netdev_priv(net);
David Brownellf29fc252005-08-31 09:52:31 -0700379 int ll_mtu = new_mtu + net->hard_header_len;
Jamie Paintera99c1942006-07-27 14:17:28 -0400380 int old_hard_mtu = dev->hard_mtu;
381 int old_rx_urb_size = dev->rx_urb_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382
Jamie Paintera99c1942006-07-27 14:17:28 -0400383 if (new_mtu <= 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 // no second zero-length packet read wanted after mtu-sized packets
David Brownellf29fc252005-08-31 09:52:31 -0700386 if ((ll_mtu % dev->maxpacket) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 return -EDOM;
388 net->mtu = new_mtu;
Jamie Paintera99c1942006-07-27 14:17:28 -0400389
390 dev->hard_mtu = net->mtu + net->hard_header_len;
391 if (dev->rx_urb_size == old_hard_mtu) {
392 dev->rx_urb_size = dev->hard_mtu;
393 if (dev->rx_urb_size > old_rx_urb_size)
394 usbnet_unlink_rx_urbs(dev);
395 }
396
Ming Leia88c32a2013-07-25 13:47:53 +0800397 /* max qlen depend on hard_mtu and rx_urb_size */
398 usbnet_update_max_qlen(dev);
399
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 return 0;
401}
Stephen Hemminger777baa42009-03-20 19:35:54 +0000402EXPORT_SYMBOL_GPL(usbnet_change_mtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800404/* The caller must hold list->lock */
405static void __usbnet_queue_skb(struct sk_buff_head *list,
406 struct sk_buff *newsk, enum skb_state state)
407{
408 struct skb_data *entry = (struct skb_data *) newsk->cb;
409
410 __skb_queue_tail(list, newsk);
411 entry->state = state;
412}
413
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414/*-------------------------------------------------------------------------*/
415
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416/* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
417 * completion callbacks. 2.5 should have fixed those bugs...
418 */
419
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800420static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb,
421 struct sk_buff_head *list, enum skb_state state)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 unsigned long flags;
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800424 enum skb_state old_state;
425 struct skb_data *entry = (struct skb_data *) skb->cb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426
David S. Miller8728b832005-08-09 19:25:21 -0700427 spin_lock_irqsave(&list->lock, flags);
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800428 old_state = entry->state;
429 entry->state = state;
David S. Miller8728b832005-08-09 19:25:21 -0700430 __skb_unlink(skb, list);
431 spin_unlock(&list->lock);
432 spin_lock(&dev->done.lock);
433 __skb_queue_tail(&dev->done, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 if (dev->done.qlen == 1)
David S. Miller8728b832005-08-09 19:25:21 -0700435 tasklet_schedule(&dev->bh);
436 spin_unlock_irqrestore(&dev->done.lock, flags);
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800437 return old_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438}
439
440/* some work can't be done in tasklets, so we use keventd
441 *
442 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
443 * but tasklet_schedule() doesn't. hope the failure is rare.
444 */
David Brownell2e55cc72005-08-31 09:53:10 -0700445void usbnet_defer_kevent (struct usbnet *dev, int work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446{
447 set_bit (work, &dev->flags);
Steve Glendinning95320212012-11-08 06:26:21 +0000448 if (!schedule_work (&dev->kevent)) {
449 if (net_ratelimit())
450 netdev_err(dev->net, "kevent %d may have been dropped\n", work);
451 } else {
Joe Perches60b86752010-02-17 10:30:23 +0000452 netdev_dbg(dev->net, "kevent %d scheduled\n", work);
Steve Glendinning95320212012-11-08 06:26:21 +0000453 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454}
David Brownell2e55cc72005-08-31 09:53:10 -0700455EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456
457/*-------------------------------------------------------------------------*/
458
David Howells7d12e782006-10-05 14:55:46 +0100459static void rx_complete (struct urb *urb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460
David S. Millerdacb3972010-08-10 02:50:55 -0700461static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462{
463 struct sk_buff *skb;
464 struct skb_data *entry;
465 int retval = 0;
466 unsigned long lockflags;
David Brownell2e55cc72005-08-31 09:53:10 -0700467 size_t size = dev->rx_urb_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468
Bjørn Mork70c37bf2013-01-28 23:51:28 +0000469 /* prevent rx skb allocation when error ratio is high */
470 if (test_bit(EVENT_RX_KILL, &dev->flags)) {
471 usb_free_urb(urb);
472 return -ENOLINK;
473 }
474
Eric Dumazet7bdd4022012-03-14 06:56:25 +0000475 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);
476 if (!skb) {
Joe Perchesa475f602010-02-17 10:30:24 +0000477 netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
David Brownell2e55cc72005-08-31 09:53:10 -0700478 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 usb_free_urb (urb);
David S. Millerdacb3972010-08-10 02:50:55 -0700480 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482
483 entry = (struct skb_data *) skb->cb;
484 entry->urb = urb;
485 entry->dev = dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 entry->length = 0;
487
488 usb_fill_bulk_urb (urb, dev->udev, dev->in,
489 skb->data, size, rx_complete, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490
491 spin_lock_irqsave (&dev->rxq.lock, lockflags);
492
Joe Perches8e95a202009-12-03 07:58:21 +0000493 if (netif_running (dev->net) &&
494 netif_device_present (dev->net) &&
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800495 !test_bit (EVENT_RX_HALT, &dev->flags) &&
496 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
David Brownell18ab4582007-05-25 12:31:32 -0700497 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 case -EPIPE:
David Brownell2e55cc72005-08-31 09:53:10 -0700499 usbnet_defer_kevent (dev, EVENT_RX_HALT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 break;
501 case -ENOMEM:
David Brownell2e55cc72005-08-31 09:53:10 -0700502 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 break;
504 case -ENODEV:
Joe Perchesa475f602010-02-17 10:30:24 +0000505 netif_dbg(dev, ifdown, dev->net, "device gone\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 netif_device_detach (dev->net);
507 break;
David S. Millerdacb3972010-08-10 02:50:55 -0700508 case -EHOSTUNREACH:
509 retval = -ENOLINK;
510 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 default:
Joe Perchesa475f602010-02-17 10:30:24 +0000512 netif_dbg(dev, rx_err, dev->net,
513 "rx submit, %d\n", retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 tasklet_schedule (&dev->bh);
515 break;
516 case 0:
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800517 __usbnet_queue_skb(&dev->rxq, skb, rx_start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 }
519 } else {
Joe Perchesa475f602010-02-17 10:30:24 +0000520 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 retval = -ENOLINK;
522 }
523 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
524 if (retval) {
525 dev_kfree_skb_any (skb);
526 usb_free_urb (urb);
527 }
David S. Millerdacb3972010-08-10 02:50:55 -0700528 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529}
530
531
532/*-------------------------------------------------------------------------*/
533
534static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
535{
Joe Perches8e95a202009-12-03 07:58:21 +0000536 if (dev->driver_info->rx_fixup &&
Andrzej Zaborowski7a635ea2011-03-28 12:56:33 +0000537 !dev->driver_info->rx_fixup (dev, skb)) {
538 /* With RX_ASSEMBLE, rx_fixup() must update counters */
539 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE))
540 dev->net->stats.rx_errors++;
541 goto done;
542 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 // else network stack removes extra byte if we forced a short packet
544
Emil Goodeeb855692014-02-13 17:50:19 +0100545 /* all data was already cloned from skb inside the driver */
546 if (dev->driver_info->flags & FLAG_MULTI_PACKET)
547 goto done;
548
549 if (skb->len < ETH_HLEN) {
550 dev->net->stats.rx_errors++;
551 dev->net->stats.rx_length_errors++;
552 netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len);
553 } else {
554 usbnet_skb_return(dev, skb);
Alexey Orishko073285f2010-11-29 23:23:27 +0000555 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 }
Alexey Orishko073285f2010-11-29 23:23:27 +0000557
Andrzej Zaborowski7a635ea2011-03-28 12:56:33 +0000558done:
Alexey Orishko073285f2010-11-29 23:23:27 +0000559 skb_queue_tail(&dev->done, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560}
561
562/*-------------------------------------------------------------------------*/
563
David Howells7d12e782006-10-05 14:55:46 +0100564static void rx_complete (struct urb *urb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565{
566 struct sk_buff *skb = (struct sk_buff *) urb->context;
567 struct skb_data *entry = (struct skb_data *) skb->cb;
568 struct usbnet *dev = entry->dev;
569 int urb_status = urb->status;
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800570 enum skb_state state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571
572 skb_put (skb, urb->actual_length);
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800573 state = rx_done;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 entry->urb = NULL;
575
576 switch (urb_status) {
David Brownell18ab4582007-05-25 12:31:32 -0700577 /* success */
578 case 0:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 break;
580
David Brownell18ab4582007-05-25 12:31:32 -0700581 /* stalls need manual reset. this is rare ... except that
582 * when going through USB 2.0 TTs, unplug appears this way.
Jean Delvare3ac49a12009-06-04 16:20:28 +0200583 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
David Brownell18ab4582007-05-25 12:31:32 -0700584 * storm, recovering as needed.
585 */
586 case -EPIPE:
Herbert Xu79638372009-06-29 16:53:28 +0000587 dev->net->stats.rx_errors++;
David Brownell2e55cc72005-08-31 09:53:10 -0700588 usbnet_defer_kevent (dev, EVENT_RX_HALT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 // FALLTHROUGH
590
David Brownell18ab4582007-05-25 12:31:32 -0700591 /* software-driven interface shutdown */
592 case -ECONNRESET: /* async unlink */
593 case -ESHUTDOWN: /* hardware gone */
Joe Perchesa475f602010-02-17 10:30:24 +0000594 netif_dbg(dev, ifdown, dev->net,
595 "rx shutdown, code %d\n", urb_status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 goto block;
597
David Brownell18ab4582007-05-25 12:31:32 -0700598 /* we get controller i/o faults during khubd disconnect() delays.
599 * throttle down resubmits, to avoid log floods; just temporarily,
600 * so we still recover when the fault isn't a khubd delay.
601 */
602 case -EPROTO:
603 case -ETIME:
604 case -EILSEQ:
Herbert Xu79638372009-06-29 16:53:28 +0000605 dev->net->stats.rx_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 if (!timer_pending (&dev->delay)) {
607 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
Joe Perchesa475f602010-02-17 10:30:24 +0000608 netif_dbg(dev, link, dev->net,
609 "rx throttle %d\n", urb_status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 }
611block:
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800612 state = rx_cleanup;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 entry->urb = urb;
614 urb = NULL;
615 break;
616
David Brownell18ab4582007-05-25 12:31:32 -0700617 /* data overrun ... flush fifo? */
618 case -EOVERFLOW:
Herbert Xu79638372009-06-29 16:53:28 +0000619 dev->net->stats.rx_over_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 // FALLTHROUGH
David Brownellcb1cebb2007-02-15 18:52:30 -0800621
David Brownell18ab4582007-05-25 12:31:32 -0700622 default:
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800623 state = rx_cleanup;
Herbert Xu79638372009-06-29 16:53:28 +0000624 dev->net->stats.rx_errors++;
Joe Perchesa475f602010-02-17 10:30:24 +0000625 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 break;
627 }
628
Bjørn Mork70c37bf2013-01-28 23:51:28 +0000629 /* stop rx if packet error rate is high */
630 if (++dev->pkt_cnt > 30) {
631 dev->pkt_cnt = 0;
632 dev->pkt_err = 0;
633 } else {
634 if (state == rx_cleanup)
635 dev->pkt_err++;
636 if (dev->pkt_err > 20)
637 set_bit(EVENT_RX_KILL, &dev->flags);
638 }
639
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800640 state = defer_bh(dev, skb, &dev->rxq, state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641
642 if (urb) {
Joe Perches8e95a202009-12-03 07:58:21 +0000643 if (netif_running (dev->net) &&
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800644 !test_bit (EVENT_RX_HALT, &dev->flags) &&
645 state != unlink_start) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 rx_submit (dev, urb, GFP_ATOMIC);
Oliver Neukum8a783352012-03-03 18:45:07 +0100647 usb_mark_last_busy(dev->udev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 return;
649 }
650 usb_free_urb (urb);
651 }
Joe Perchesa475f602010-02-17 10:30:24 +0000652 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653}
654
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655/*-------------------------------------------------------------------------*/
Jussi Kivilinna7834ddb2009-08-11 22:57:16 +0300656void usbnet_pause_rx(struct usbnet *dev)
657{
658 set_bit(EVENT_RX_PAUSED, &dev->flags);
659
Joe Perchesa475f602010-02-17 10:30:24 +0000660 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
Jussi Kivilinna7834ddb2009-08-11 22:57:16 +0300661}
662EXPORT_SYMBOL_GPL(usbnet_pause_rx);
663
664void usbnet_resume_rx(struct usbnet *dev)
665{
666 struct sk_buff *skb;
667 int num = 0;
668
669 clear_bit(EVENT_RX_PAUSED, &dev->flags);
670
671 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
672 usbnet_skb_return(dev, skb);
673 num++;
674 }
675
676 tasklet_schedule(&dev->bh);
677
Joe Perchesa475f602010-02-17 10:30:24 +0000678 netif_dbg(dev, rx_status, dev->net,
679 "paused rx queue disabled, %d skbs requeued\n", num);
Jussi Kivilinna7834ddb2009-08-11 22:57:16 +0300680}
681EXPORT_SYMBOL_GPL(usbnet_resume_rx);
682
683void usbnet_purge_paused_rxq(struct usbnet *dev)
684{
685 skb_queue_purge(&dev->rxq_pause);
686}
687EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
688
689/*-------------------------------------------------------------------------*/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690
691// unlink pending rx/tx; completion handlers do all other cleanup
692
693static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
694{
695 unsigned long flags;
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800696 struct sk_buff *skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697 int count = 0;
698
699 spin_lock_irqsave (&q->lock, flags);
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800700 while (!skb_queue_empty(q)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 struct skb_data *entry;
702 struct urb *urb;
703 int retval;
704
Ming Lei5b6e9bc2012-04-26 11:33:46 +0800705 skb_queue_walk(q, skb) {
706 entry = (struct skb_data *) skb->cb;
707 if (entry->state != unlink_start)
708 goto found;
709 }
710 break;
711found:
712 entry->state = unlink_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 urb = entry->urb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714
tom.leiming@gmail.com0956a8c2012-03-22 03:22:18 +0000715 /*
716 * Get reference count of the URB to avoid it to be
717 * freed during usb_unlink_urb, which may trigger
718 * use-after-free problem inside usb_unlink_urb since
719 * usb_unlink_urb is always racing with .complete
720 * handler(include defer_bh).
721 */
722 usb_get_urb(urb);
Sebastian Siewior4231d472012-03-07 10:19:28 +0000723 spin_unlock_irqrestore(&q->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 // during some PM-driven resume scenarios,
725 // these (async) unlinks complete immediately
726 retval = usb_unlink_urb (urb);
727 if (retval != -EINPROGRESS && retval != 0)
Joe Perches60b86752010-02-17 10:30:23 +0000728 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 else
730 count++;
tom.leiming@gmail.com0956a8c2012-03-22 03:22:18 +0000731 usb_put_urb(urb);
Sebastian Siewior4231d472012-03-07 10:19:28 +0000732 spin_lock_irqsave(&q->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 }
734 spin_unlock_irqrestore (&q->lock, flags);
735 return count;
736}
737
Jamie Paintera99c1942006-07-27 14:17:28 -0400738// Flush all pending rx urbs
739// minidrivers may need to do this when the MTU changes
740
741void usbnet_unlink_rx_urbs(struct usbnet *dev)
742{
743 if (netif_running(dev->net)) {
744 (void) unlink_urbs (dev, &dev->rxq);
745 tasklet_schedule(&dev->bh);
746 }
747}
748EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749
750/*-------------------------------------------------------------------------*/
751
752// precondition: never called in_interrupt
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800753static void usbnet_terminate_urbs(struct usbnet *dev)
754{
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800755 DECLARE_WAITQUEUE(wait, current);
756 int temp;
757
758 /* ensure there are no more active urbs */
Oliver Neukum14a0d632014-03-26 14:32:51 +0100759 add_wait_queue(&dev->wait, &wait);
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800760 set_current_state(TASK_UNINTERRUPTIBLE);
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800761 temp = unlink_urbs(dev, &dev->txq) +
762 unlink_urbs(dev, &dev->rxq);
763
764 /* maybe wait for deletions to finish. */
765 while (!skb_queue_empty(&dev->rxq)
766 && !skb_queue_empty(&dev->txq)
767 && !skb_queue_empty(&dev->done)) {
Kulikov Vasiliy66cc42a42010-07-25 22:25:42 +0000768 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800769 set_current_state(TASK_UNINTERRUPTIBLE);
Joe Perchesa475f602010-02-17 10:30:24 +0000770 netif_dbg(dev, ifdown, dev->net,
771 "waited for %d urb completions\n", temp);
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800772 }
773 set_current_state(TASK_RUNNING);
Oliver Neukum14a0d632014-03-26 14:32:51 +0100774 remove_wait_queue(&dev->wait, &wait);
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800775}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776
Stephen Hemminger777baa42009-03-20 19:35:54 +0000777int usbnet_stop (struct net_device *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778{
779 struct usbnet *dev = netdev_priv(net);
Jussi Kivilinnaa33e9e72009-06-16 17:17:27 +0300780 struct driver_info *info = dev->driver_info;
Oliver Neukum14a0d632014-03-26 14:32:51 +0100781 int retval, pm;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782
Ming Lei75bd0cb2011-04-28 22:37:09 +0000783 clear_bit(EVENT_DEV_OPEN, &dev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 netif_stop_queue (net);
785
Joe Perchesa475f602010-02-17 10:30:24 +0000786 netif_info(dev, ifdown, dev->net,
Ben Hutchings8ccef432010-06-08 08:20:59 +0000787 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
Joe Perchesa475f602010-02-17 10:30:24 +0000788 net->stats.rx_packets, net->stats.tx_packets,
789 net->stats.rx_errors, net->stats.tx_errors);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790
Oliver Neukum14a0d632014-03-26 14:32:51 +0100791 /* to not race resume */
792 pm = usb_autopm_get_interface(dev->intf);
Jussi Kivilinnaa33e9e72009-06-16 17:17:27 +0300793 /* allow minidriver to stop correctly (wireless devices to turn off
794 * radio etc) */
795 if (info->stop) {
796 retval = info->stop(dev);
Joe Perchesa475f602010-02-17 10:30:24 +0000797 if (retval < 0)
798 netif_info(dev, ifdown, dev->net,
799 "stop fail (%d) usbnet usb-%s-%s, %s\n",
800 retval,
801 dev->udev->bus->bus_name, dev->udev->devpath,
802 info->description);
Jussi Kivilinnaa33e9e72009-06-16 17:17:27 +0300803 }
804
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800805 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
806 usbnet_terminate_urbs(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807
Dan Williams6eecdc52013-05-06 11:29:23 +0000808 usbnet_status_stop(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809
Jussi Kivilinna7834ddb2009-08-11 22:57:16 +0300810 usbnet_purge_paused_rxq(dev);
811
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 /* deferred work (task, timer, softirq) must also stop.
813 * can't flush_scheduled_work() until we drop rtnl (later),
814 * else workers could deadlock; so make workers a NOP.
815 */
816 dev->flags = 0;
817 del_timer_sync (&dev->delay);
818 tasklet_kill (&dev->bh);
Oliver Neukum14a0d632014-03-26 14:32:51 +0100819 if (!pm)
820 usb_autopm_put_interface(dev->intf);
821
Oliver Neukuma1c088e2012-12-18 04:45:29 +0000822 if (info->manage_power &&
823 !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags))
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800824 info->manage_power(dev, 0);
825 else
826 usb_autopm_put_interface(dev->intf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827
828 return 0;
829}
Stephen Hemminger777baa42009-03-20 19:35:54 +0000830EXPORT_SYMBOL_GPL(usbnet_stop);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831
832/*-------------------------------------------------------------------------*/
833
834// posts reads, and enables write queuing
835
836// precondition: never called in_interrupt
837
Stephen Hemminger777baa42009-03-20 19:35:54 +0000838int usbnet_open (struct net_device *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839{
840 struct usbnet *dev = netdev_priv(net);
Oliver Neukuma11a6542007-08-03 13:52:19 +0200841 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 struct driver_info *info = dev->driver_info;
843
Oliver Neukuma11a6542007-08-03 13:52:19 +0200844 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
Joe Perchesa475f602010-02-17 10:30:24 +0000845 netif_info(dev, ifup, dev->net,
846 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
847 retval,
848 dev->udev->bus->bus_name,
849 dev->udev->devpath,
850 info->description);
Oliver Neukuma11a6542007-08-03 13:52:19 +0200851 goto done_nopm;
852 }
853
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854 // put into "known safe" state
855 if (info->reset && (retval = info->reset (dev)) < 0) {
Joe Perchesa475f602010-02-17 10:30:24 +0000856 netif_info(dev, ifup, dev->net,
857 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
858 retval,
859 dev->udev->bus->bus_name,
860 dev->udev->devpath,
861 info->description);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862 goto done;
863 }
864
Ming Leia88c32a2013-07-25 13:47:53 +0800865 /* hard_mtu or rx_urb_size may change in reset() */
866 usbnet_update_max_qlen(dev);
867
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 // insist peer be connected
869 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
Joe Perchesa475f602010-02-17 10:30:24 +0000870 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 goto done;
872 }
873
874 /* start any status interrupt transfer */
875 if (dev->interrupt) {
Dan Williams6eecdc52013-05-06 11:29:23 +0000876 retval = usbnet_status_start(dev, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 if (retval < 0) {
Joe Perchesa475f602010-02-17 10:30:24 +0000878 netif_err(dev, ifup, dev->net,
879 "intr submit %d\n", retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880 goto done;
881 }
882 }
883
Paul Stewart68972ef2011-04-28 05:43:37 +0000884 set_bit(EVENT_DEV_OPEN, &dev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885 netif_start_queue (net);
Joe Perchesa475f602010-02-17 10:30:24 +0000886 netif_info(dev, ifup, dev->net,
887 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
888 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
889 dev->net->mtu,
890 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
891 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
892 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
893 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
894 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
895 "simple");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896
Bjørn Mork70c37bf2013-01-28 23:51:28 +0000897 /* reset rx error state */
898 dev->pkt_cnt = 0;
899 dev->pkt_err = 0;
900 clear_bit(EVENT_RX_KILL, &dev->flags);
901
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 // delay posting reads until we're fully open
903 tasklet_schedule (&dev->bh);
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800904 if (info->manage_power) {
905 retval = info->manage_power(dev, 1);
Oliver Neukuma1c088e2012-12-18 04:45:29 +0000906 if (retval < 0) {
907 retval = 0;
908 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
909 } else {
910 usb_autopm_put_interface(dev->intf);
911 }
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800912 }
Oliver Neukuma11a6542007-08-03 13:52:19 +0200913 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914done:
Oliver Neukuma11a6542007-08-03 13:52:19 +0200915 usb_autopm_put_interface(dev->intf);
916done_nopm:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917 return retval;
918}
Stephen Hemminger777baa42009-03-20 19:35:54 +0000919EXPORT_SYMBOL_GPL(usbnet_open);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920
921/*-------------------------------------------------------------------------*/
922
David Brownell2e55cc72005-08-31 09:53:10 -0700923/* ethtool methods; minidrivers may need to add some more, but
924 * they'll probably want to use this base set.
925 */
926
Arnd Bergmannc41286f2006-10-09 00:08:01 +0200927int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
928{
929 struct usbnet *dev = netdev_priv(net);
930
931 if (!dev->mii.mdio_read)
932 return -EOPNOTSUPP;
933
934 return mii_ethtool_gset(&dev->mii, cmd);
935}
936EXPORT_SYMBOL_GPL(usbnet_get_settings);
937
938int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
939{
940 struct usbnet *dev = netdev_priv(net);
941 int retval;
942
943 if (!dev->mii.mdio_write)
944 return -EOPNOTSUPP;
945
946 retval = mii_ethtool_sset(&dev->mii, cmd);
947
948 /* link speed/duplex might have changed */
949 if (dev->driver_info->link_reset)
950 dev->driver_info->link_reset(dev);
951
Ming Leia88c32a2013-07-25 13:47:53 +0800952 /* hard_mtu or rx_urb_size may change in link_reset() */
953 usbnet_update_max_qlen(dev);
954
Arnd Bergmannc41286f2006-10-09 00:08:01 +0200955 return retval;
956
957}
958EXPORT_SYMBOL_GPL(usbnet_set_settings);
959
Arnd Bergmannc41286f2006-10-09 00:08:01 +0200960u32 usbnet_get_link (struct net_device *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961{
962 struct usbnet *dev = netdev_priv(net);
963
David Brownellf29fc252005-08-31 09:52:31 -0700964 /* If a check_connect is defined, return its result */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965 if (dev->driver_info->check_connect)
966 return dev->driver_info->check_connect (dev) == 0;
967
Arnd Bergmannc41286f2006-10-09 00:08:01 +0200968 /* if the device has mii operations, use those */
969 if (dev->mii.mdio_read)
970 return mii_link_ok(&dev->mii);
971
Bjørn Mork05ffb3e2009-03-01 20:45:40 -0800972 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
973 return ethtool_op_get_link(net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974}
Arnd Bergmannc41286f2006-10-09 00:08:01 +0200975EXPORT_SYMBOL_GPL(usbnet_get_link);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976
David Brownell18ee91fa2006-11-02 12:29:12 -0800977int usbnet_nway_reset(struct net_device *net)
978{
979 struct usbnet *dev = netdev_priv(net);
980
981 if (!dev->mii.mdio_write)
982 return -EOPNOTSUPP;
983
984 return mii_nway_restart(&dev->mii);
985}
986EXPORT_SYMBOL_GPL(usbnet_nway_reset);
987
David Brownell18ee91fa2006-11-02 12:29:12 -0800988void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
989{
990 struct usbnet *dev = netdev_priv(net);
991
Phil Sutter86a2f412012-06-14 01:18:42 +0000992 strlcpy (info->driver, dev->driver_name, sizeof info->driver);
993 strlcpy (info->version, DRIVER_VERSION, sizeof info->version);
994 strlcpy (info->fw_version, dev->driver_info->description,
David Brownell18ee91fa2006-11-02 12:29:12 -0800995 sizeof info->fw_version);
996 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
997}
998EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
999
David Brownell2e55cc72005-08-31 09:53:10 -07001000u32 usbnet_get_msglevel (struct net_device *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001{
1002 struct usbnet *dev = netdev_priv(net);
1003
1004 return dev->msg_enable;
1005}
David Brownell2e55cc72005-08-31 09:53:10 -07001006EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007
David Brownell2e55cc72005-08-31 09:53:10 -07001008void usbnet_set_msglevel (struct net_device *net, u32 level)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009{
1010 struct usbnet *dev = netdev_priv(net);
1011
1012 dev->msg_enable = level;
1013}
David Brownell2e55cc72005-08-31 09:53:10 -07001014EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015
David Brownell2e55cc72005-08-31 09:53:10 -07001016/* drivers may override default ethtool_ops in their bind() routine */
Stephen Hemminger0fc0b732009-09-02 01:03:33 -07001017static const struct ethtool_ops usbnet_ethtool_ops = {
Arnd Bergmannc41286f2006-10-09 00:08:01 +02001018 .get_settings = usbnet_get_settings,
1019 .set_settings = usbnet_set_settings,
David Brownell2e55cc72005-08-31 09:53:10 -07001020 .get_link = usbnet_get_link,
Arnd Bergmannc41286f2006-10-09 00:08:01 +02001021 .nway_reset = usbnet_nway_reset,
David Brownell18ee91fa2006-11-02 12:29:12 -08001022 .get_drvinfo = usbnet_get_drvinfo,
David Brownell2e55cc72005-08-31 09:53:10 -07001023 .get_msglevel = usbnet_get_msglevel,
1024 .set_msglevel = usbnet_set_msglevel,
Richard Cochran123edb12012-04-03 22:59:41 +00001025 .get_ts_info = ethtool_op_get_ts_info,
David Brownell2e55cc72005-08-31 09:53:10 -07001026};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027
1028/*-------------------------------------------------------------------------*/
1029
Ming Lei4b49f582013-04-11 04:40:40 +00001030static void __handle_link_change(struct usbnet *dev)
1031{
1032 if (!test_bit(EVENT_DEV_OPEN, &dev->flags))
1033 return;
1034
1035 if (!netif_carrier_ok(dev->net)) {
1036 /* kill URBs for reading packets to save bus bandwidth */
1037 unlink_urbs(dev, &dev->rxq);
1038
1039 /*
1040 * tx_timeout will unlink URBs for sending packets and
1041 * tx queue is stopped by netcore after link becomes off
1042 */
1043 } else {
1044 /* submitting URBs for reading packets */
1045 tasklet_schedule(&dev->bh);
1046 }
1047
Ming Leia88c32a2013-07-25 13:47:53 +08001048 /* hard_mtu or rx_urb_size may change during link change */
1049 usbnet_update_max_qlen(dev);
1050
Ming Lei4b49f582013-04-11 04:40:40 +00001051 clear_bit(EVENT_LINK_CHANGE, &dev->flags);
1052}
1053
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054/* work that cannot be done in interrupt context uses keventd.
1055 *
1056 * NOTE: with 2.5 we could do more of this using completion callbacks,
1057 * especially now that control transfers can be queued.
1058 */
1059static void
David Howellsc4028952006-11-22 14:57:56 +00001060kevent (struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061{
David Howellsc4028952006-11-22 14:57:56 +00001062 struct usbnet *dev =
1063 container_of(work, struct usbnet, kevent);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 int status;
1065
1066 /* usb_clear_halt() needs a thread context */
1067 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
1068 unlink_urbs (dev, &dev->txq);
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001069 status = usb_autopm_get_interface(dev->intf);
1070 if (status < 0)
1071 goto fail_pipe;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072 status = usb_clear_halt (dev->udev, dev->out);
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001073 usb_autopm_put_interface(dev->intf);
Joe Perches8e95a202009-12-03 07:58:21 +00001074 if (status < 0 &&
1075 status != -EPIPE &&
1076 status != -ESHUTDOWN) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 if (netif_msg_tx_err (dev))
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001078fail_pipe:
Joe Perches60b86752010-02-17 10:30:23 +00001079 netdev_err(dev->net, "can't clear tx halt, status %d\n",
1080 status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081 } else {
1082 clear_bit (EVENT_TX_HALT, &dev->flags);
David Brownellf29fc252005-08-31 09:52:31 -07001083 if (status != -ESHUTDOWN)
1084 netif_wake_queue (dev->net);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 }
1086 }
1087 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
1088 unlink_urbs (dev, &dev->rxq);
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001089 status = usb_autopm_get_interface(dev->intf);
1090 if (status < 0)
1091 goto fail_halt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092 status = usb_clear_halt (dev->udev, dev->in);
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001093 usb_autopm_put_interface(dev->intf);
Joe Perches8e95a202009-12-03 07:58:21 +00001094 if (status < 0 &&
1095 status != -EPIPE &&
1096 status != -ESHUTDOWN) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097 if (netif_msg_rx_err (dev))
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001098fail_halt:
Joe Perches60b86752010-02-17 10:30:23 +00001099 netdev_err(dev->net, "can't clear rx halt, status %d\n",
1100 status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101 } else {
1102 clear_bit (EVENT_RX_HALT, &dev->flags);
1103 tasklet_schedule (&dev->bh);
1104 }
1105 }
1106
1107 /* tasklet could resubmit itself forever if memory is tight */
1108 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
1109 struct urb *urb = NULL;
David S. Millerdacb3972010-08-10 02:50:55 -07001110 int resched = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111
1112 if (netif_running (dev->net))
1113 urb = usb_alloc_urb (0, GFP_KERNEL);
1114 else
1115 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1116 if (urb != NULL) {
1117 clear_bit (EVENT_RX_MEMORY, &dev->flags);
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001118 status = usb_autopm_get_interface(dev->intf);
Jesper Juhlab607072011-02-10 10:58:45 +00001119 if (status < 0) {
1120 usb_free_urb(urb);
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001121 goto fail_lowmem;
Jesper Juhlab607072011-02-10 10:58:45 +00001122 }
David S. Millerdacb3972010-08-10 02:50:55 -07001123 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
1124 resched = 0;
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001125 usb_autopm_put_interface(dev->intf);
1126fail_lowmem:
David S. Millerdacb3972010-08-10 02:50:55 -07001127 if (resched)
1128 tasklet_schedule (&dev->bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129 }
1130 }
1131
David Hollis7ea13c92005-04-22 15:07:02 -07001132 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
David Brownellcb1cebb2007-02-15 18:52:30 -08001133 struct driver_info *info = dev->driver_info;
David Hollis7ea13c92005-04-22 15:07:02 -07001134 int retval = 0;
1135
1136 clear_bit (EVENT_LINK_RESET, &dev->flags);
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001137 status = usb_autopm_get_interface(dev->intf);
1138 if (status < 0)
1139 goto skip_reset;
David Hollis7ea13c92005-04-22 15:07:02 -07001140 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001141 usb_autopm_put_interface(dev->intf);
1142skip_reset:
Joe Perches60b86752010-02-17 10:30:23 +00001143 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
1144 retval,
1145 dev->udev->bus->bus_name,
1146 dev->udev->devpath,
1147 info->description);
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001148 } else {
1149 usb_autopm_put_interface(dev->intf);
David Hollis7ea13c92005-04-22 15:07:02 -07001150 }
Ming Lei4b49f582013-04-11 04:40:40 +00001151
1152 /* handle link change from link resetting */
1153 __handle_link_change(dev);
David Hollis7ea13c92005-04-22 15:07:02 -07001154 }
1155
Ming Lei4b49f582013-04-11 04:40:40 +00001156 if (test_bit (EVENT_LINK_CHANGE, &dev->flags))
1157 __handle_link_change(dev);
1158
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159 if (dev->flags)
Joe Perches60b86752010-02-17 10:30:23 +00001160 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161}
1162
1163/*-------------------------------------------------------------------------*/
1164
David Howells7d12e782006-10-05 14:55:46 +01001165static void tx_complete (struct urb *urb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166{
1167 struct sk_buff *skb = (struct sk_buff *) urb->context;
1168 struct skb_data *entry = (struct skb_data *) skb->cb;
1169 struct usbnet *dev = entry->dev;
1170
1171 if (urb->status == 0) {
Alexey Orishko073285f2010-11-29 23:23:27 +00001172 if (!(dev->driver_info->flags & FLAG_MULTI_PACKET))
1173 dev->net->stats.tx_packets++;
Herbert Xu79638372009-06-29 16:53:28 +00001174 dev->net->stats.tx_bytes += entry->length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175 } else {
Herbert Xu79638372009-06-29 16:53:28 +00001176 dev->net->stats.tx_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177
1178 switch (urb->status) {
1179 case -EPIPE:
David Brownell2e55cc72005-08-31 09:53:10 -07001180 usbnet_defer_kevent (dev, EVENT_TX_HALT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 break;
1182
1183 /* software-driven interface shutdown */
1184 case -ECONNRESET: // async unlink
1185 case -ESHUTDOWN: // hardware gone
1186 break;
1187
1188 // like rx, tx gets controller i/o faults during khubd delays
1189 // and so it uses the same throttling mechanism.
Pete Zaitcev38e2bfc2006-09-18 22:49:02 -07001190 case -EPROTO:
1191 case -ETIME:
1192 case -EILSEQ:
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001193 usb_mark_last_busy(dev->udev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194 if (!timer_pending (&dev->delay)) {
1195 mod_timer (&dev->delay,
1196 jiffies + THROTTLE_JIFFIES);
Joe Perchesa475f602010-02-17 10:30:24 +00001197 netif_dbg(dev, link, dev->net,
1198 "tx throttle %d\n", urb->status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199 }
1200 netif_stop_queue (dev->net);
1201 break;
1202 default:
Joe Perchesa475f602010-02-17 10:30:24 +00001203 netif_dbg(dev, tx_err, dev->net,
1204 "tx err %d\n", entry->urb->status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 break;
1206 }
1207 }
1208
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001209 usb_autopm_put_interface_async(dev->intf);
Ming Lei5b6e9bc2012-04-26 11:33:46 +08001210 (void) defer_bh(dev, skb, &dev->txq, tx_done);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211}
1212
1213/*-------------------------------------------------------------------------*/
1214
Stephen Hemminger777baa42009-03-20 19:35:54 +00001215void usbnet_tx_timeout (struct net_device *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216{
1217 struct usbnet *dev = netdev_priv(net);
1218
1219 unlink_urbs (dev, &dev->txq);
1220 tasklet_schedule (&dev->bh);
Oliver Neukumdbcdd4d2014-08-01 14:01:51 +02001221 /* this needs to be handled individually because the generic layer
1222 * doesn't know what is sufficient and could not restore private
1223 * information if a remedy of an unconditional reset were used.
1224 */
1225 if (dev->driver_info->recover)
1226 (dev->driver_info->recover)(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227}
Stephen Hemminger777baa42009-03-20 19:35:54 +00001228EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229
1230/*-------------------------------------------------------------------------*/
1231
Ming Lei638c5112013-08-08 21:48:24 +08001232static int build_dma_sg(const struct sk_buff *skb, struct urb *urb)
1233{
1234 unsigned num_sgs, total_len = 0;
1235 int i, s = 0;
1236
1237 num_sgs = skb_shinfo(skb)->nr_frags + 1;
1238 if (num_sgs == 1)
1239 return 0;
1240
Ming Lei60e453a2013-09-23 20:59:35 +08001241 /* reserve one for zero packet */
1242 urb->sg = kmalloc((num_sgs + 1) * sizeof(struct scatterlist),
1243 GFP_ATOMIC);
Ming Lei638c5112013-08-08 21:48:24 +08001244 if (!urb->sg)
1245 return -ENOMEM;
1246
1247 urb->num_sgs = num_sgs;
Bjørn Morkfdc34522014-01-10 23:10:17 +01001248 sg_init_table(urb->sg, urb->num_sgs + 1);
Ming Lei638c5112013-08-08 21:48:24 +08001249
1250 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb));
1251 total_len += skb_headlen(skb);
1252
1253 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1254 struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i];
1255
1256 total_len += skb_frag_size(f);
1257 sg_set_page(&urb->sg[i + s], f->page.p, f->size,
1258 f->page_offset);
1259 }
1260 urb->transfer_buffer_length = total_len;
1261
1262 return 1;
1263}
1264
Stephen Hemminger25a79c42009-08-31 19:50:45 +00001265netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1266 struct net_device *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267{
1268 struct usbnet *dev = netdev_priv(net);
1269 int length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 struct urb *urb = NULL;
1271 struct skb_data *entry;
1272 struct driver_info *info = dev->driver_info;
1273 unsigned long flags;
Stephen Hemminger25a79c42009-08-31 19:50:45 +00001274 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275
Konstantin Khlebnikov23ba0792011-11-07 05:54:58 +00001276 if (skb)
1277 skb_tx_timestamp(skb);
Michael Rieschf9b491e2011-09-29 04:06:26 +00001278
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279 // some devices want funky USB-level framing, for
1280 // win32 driver (usually) and/or hardware quirks
1281 if (info->tx_fixup) {
1282 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1283 if (!skb) {
Bjørn Morkbf414b32013-01-31 08:36:05 +00001284 /* packet collected; minidriver waiting for more */
1285 if (info->flags & FLAG_MULTI_PACKET)
Alexey Orishko073285f2010-11-29 23:23:27 +00001286 goto not_drop;
Bjørn Morkbf414b32013-01-31 08:36:05 +00001287 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1288 goto drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289 }
1290 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291
1292 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
Joe Perchesa475f602010-02-17 10:30:24 +00001293 netif_dbg(dev, tx_err, dev->net, "no urb\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294 goto drop;
1295 }
1296
1297 entry = (struct skb_data *) skb->cb;
1298 entry->urb = urb;
1299 entry->dev = dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1302 skb->data, skb->len, tx_complete, skb);
Ming Lei638c5112013-08-08 21:48:24 +08001303 if (dev->can_dma_sg) {
1304 if (build_dma_sg(skb, urb) < 0)
1305 goto drop;
1306 }
Ming Lei60e453a2013-09-23 20:59:35 +08001307 length = urb->transfer_buffer_length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308
1309 /* don't assume the hardware handles USB_ZERO_PACKET
1310 * NOTE: strictly conforming cdc-ether devices should expect
1311 * the ZLP here, but ignore the one-byte packet.
Alexey Orishko073285f2010-11-29 23:23:27 +00001312 * NOTE2: CDC NCM specification is different from CDC ECM when
1313 * handling ZLP/short packets, so cdc_ncm driver will make short
1314 * packet itself if needed.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315 */
Elina Pashevab4d562e32010-04-06 14:23:07 +00001316 if (length % dev->maxpacket == 0) {
1317 if (!(info->flags & FLAG_SEND_ZLP)) {
Alexey Orishko073285f2010-11-29 23:23:27 +00001318 if (!(info->flags & FLAG_MULTI_PACKET)) {
Ming Lei60e453a2013-09-23 20:59:35 +08001319 length++;
1320 if (skb_tailroom(skb) && !urb->num_sgs) {
Alexey Orishko073285f2010-11-29 23:23:27 +00001321 skb->data[skb->len] = 0;
1322 __skb_put(skb, 1);
Ming Lei60e453a2013-09-23 20:59:35 +08001323 } else if (urb->num_sgs)
1324 sg_set_buf(&urb->sg[urb->num_sgs++],
1325 dev->padding_pkt, 1);
Elina Pashevab4d562e32010-04-06 14:23:07 +00001326 }
1327 } else
1328 urb->transfer_flags |= URB_ZERO_PACKET;
Peter Korsgaard3e323f32007-06-27 08:48:15 +02001329 }
Ming Lei60e453a2013-09-23 20:59:35 +08001330 entry->length = urb->transfer_buffer_length = length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001332 spin_lock_irqsave(&dev->txq.lock, flags);
1333 retval = usb_autopm_get_interface_async(dev->intf);
1334 if (retval < 0) {
1335 spin_unlock_irqrestore(&dev->txq.lock, flags);
1336 goto drop;
1337 }
1338
1339#ifdef CONFIG_PM
1340 /* if this triggers the device is still a sleep */
1341 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1342 /* transmission will be done in resume */
1343 usb_anchor_urb(urb, &dev->deferred);
1344 /* no use to process more packets */
1345 netif_stop_queue(net);
Hemant Kumar39707c22012-10-25 18:17:54 +00001346 usb_put_urb(urb);
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001347 spin_unlock_irqrestore(&dev->txq.lock, flags);
Joe Perches60b86752010-02-17 10:30:23 +00001348 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001349 goto deferred;
1350 }
1351#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1354 case -EPIPE:
1355 netif_stop_queue (net);
David Brownell2e55cc72005-08-31 09:53:10 -07001356 usbnet_defer_kevent (dev, EVENT_TX_HALT);
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001357 usb_autopm_put_interface_async(dev->intf);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358 break;
1359 default:
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001360 usb_autopm_put_interface_async(dev->intf);
Joe Perchesa475f602010-02-17 10:30:24 +00001361 netif_dbg(dev, tx_err, dev->net,
1362 "tx: submit urb err %d\n", retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363 break;
1364 case 0:
1365 net->trans_start = jiffies;
Ming Lei5b6e9bc2012-04-26 11:33:46 +08001366 __usbnet_queue_skb(&dev->txq, skb, tx_start);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367 if (dev->txq.qlen >= TX_QLEN (dev))
1368 netif_stop_queue (net);
1369 }
1370 spin_unlock_irqrestore (&dev->txq.lock, flags);
1371
1372 if (retval) {
Joe Perchesa475f602010-02-17 10:30:24 +00001373 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374drop:
Herbert Xu79638372009-06-29 16:53:28 +00001375 dev->net->stats.tx_dropped++;
Alexey Orishko073285f2010-11-29 23:23:27 +00001376not_drop:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377 if (skb)
1378 dev_kfree_skb_any (skb);
Ming Lei638c5112013-08-08 21:48:24 +08001379 if (urb) {
1380 kfree(urb->sg);
1381 usb_free_urb(urb);
1382 }
Joe Perchesa475f602010-02-17 10:30:24 +00001383 } else
1384 netif_dbg(dev, tx_queued, dev->net,
1385 "> tx, len %d, type 0x%x\n", length, skb->protocol);
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001386#ifdef CONFIG_PM
1387deferred:
1388#endif
Stephen Hemminger25a79c42009-08-31 19:50:45 +00001389 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390}
Stephen Hemminger777baa42009-03-20 19:35:54 +00001391EXPORT_SYMBOL_GPL(usbnet_start_xmit);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392
Bjørn Mork85e87872012-09-02 22:26:18 +00001393static int rx_alloc_submit(struct usbnet *dev, gfp_t flags)
Ming Lei65841fd2012-06-19 21:15:53 +00001394{
1395 struct urb *urb;
1396 int i;
Bjørn Mork85e87872012-09-02 22:26:18 +00001397 int ret = 0;
Ming Lei65841fd2012-06-19 21:15:53 +00001398
1399 /* don't refill the queue all at once */
1400 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) {
1401 urb = usb_alloc_urb(0, flags);
1402 if (urb != NULL) {
Bjørn Mork85e87872012-09-02 22:26:18 +00001403 ret = rx_submit(dev, urb, flags);
1404 if (ret)
1405 goto err;
1406 } else {
1407 ret = -ENOMEM;
1408 goto err;
Ming Lei65841fd2012-06-19 21:15:53 +00001409 }
1410 }
Bjørn Mork85e87872012-09-02 22:26:18 +00001411err:
1412 return ret;
Ming Lei65841fd2012-06-19 21:15:53 +00001413}
1414
Linus Torvalds1da177e2005-04-16 15:20:36 -07001415/*-------------------------------------------------------------------------*/
1416
1417// tasklet (work deferred from completions, in_irq) or timer
1418
1419static void usbnet_bh (unsigned long param)
1420{
1421 struct usbnet *dev = (struct usbnet *) param;
1422 struct sk_buff *skb;
1423 struct skb_data *entry;
1424
1425 while ((skb = skb_dequeue (&dev->done))) {
1426 entry = (struct skb_data *) skb->cb;
1427 switch (entry->state) {
David Brownell18ab4582007-05-25 12:31:32 -07001428 case rx_done:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429 entry->state = rx_cleanup;
1430 rx_process (dev, skb);
1431 continue;
David Brownell18ab4582007-05-25 12:31:32 -07001432 case tx_done:
Ming Lei638c5112013-08-08 21:48:24 +08001433 kfree(entry->urb->sg);
David Brownell18ab4582007-05-25 12:31:32 -07001434 case rx_cleanup:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001435 usb_free_urb (entry->urb);
1436 dev_kfree_skb (skb);
1437 continue;
David Brownell18ab4582007-05-25 12:31:32 -07001438 default:
Joe Perches60b86752010-02-17 10:30:23 +00001439 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440 }
1441 }
1442
Bjørn Mork70c37bf2013-01-28 23:51:28 +00001443 /* restart RX again after disabling due to high error rate */
1444 clear_bit(EVENT_RX_KILL, &dev->flags);
1445
Oliver Neukum14a0d632014-03-26 14:32:51 +01001446 /* waiting for all pending urbs to complete?
1447 * only then can we forgo submitting anew
1448 */
1449 if (waitqueue_active(&dev->wait)) {
1450 if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0)
1451 wake_up_all(&dev->wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452
1453 // or are we maybe short a few urbs?
Joe Perches8e95a202009-12-03 07:58:21 +00001454 } else if (netif_running (dev->net) &&
1455 netif_device_present (dev->net) &&
Ming Lei4b49f582013-04-11 04:40:40 +00001456 netif_carrier_ok(dev->net) &&
Joe Perches8e95a202009-12-03 07:58:21 +00001457 !timer_pending (&dev->delay) &&
1458 !test_bit (EVENT_RX_HALT, &dev->flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459 int temp = dev->rxq.qlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460
Ming Lei65841fd2012-06-19 21:15:53 +00001461 if (temp < RX_QLEN(dev)) {
Bjørn Mork85e87872012-09-02 22:26:18 +00001462 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK)
1463 return;
Joe Perchesa475f602010-02-17 10:30:24 +00001464 if (temp != dev->rxq.qlen)
1465 netif_dbg(dev, link, dev->net,
1466 "rxqlen %d --> %d\n",
1467 temp, dev->rxq.qlen);
Ming Lei65841fd2012-06-19 21:15:53 +00001468 if (dev->rxq.qlen < RX_QLEN(dev))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469 tasklet_schedule (&dev->bh);
1470 }
1471 if (dev->txq.qlen < TX_QLEN (dev))
1472 netif_wake_queue (dev->net);
1473 }
1474}
1475
1476
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477/*-------------------------------------------------------------------------
1478 *
1479 * USB Device Driver support
1480 *
1481 *-------------------------------------------------------------------------*/
David Brownellcb1cebb2007-02-15 18:52:30 -08001482
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483// precondition: never called in_interrupt
1484
David Brownell38bde1d2005-08-31 09:52:45 -07001485void usbnet_disconnect (struct usb_interface *intf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486{
1487 struct usbnet *dev;
1488 struct usb_device *xdev;
1489 struct net_device *net;
1490
1491 dev = usb_get_intfdata(intf);
1492 usb_set_intfdata(intf, NULL);
1493 if (!dev)
1494 return;
1495
1496 xdev = interface_to_usbdev (intf);
1497
Joe Perchesa475f602010-02-17 10:30:24 +00001498 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1499 intf->dev.driver->name,
1500 xdev->bus->bus_name, xdev->devpath,
1501 dev->driver_info->description);
David Brownellcb1cebb2007-02-15 18:52:30 -08001502
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503 net = dev->net;
1504 unregister_netdev (net);
1505
Tejun Heo23f333a2010-12-12 16:45:14 +01001506 cancel_work_sync(&dev->kevent);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001507
Hemant Kumar39707c22012-10-25 18:17:54 +00001508 usb_scuttle_anchored_urbs(&dev->deferred);
1509
Linus Torvalds1da177e2005-04-16 15:20:36 -07001510 if (dev->driver_info->unbind)
1511 dev->driver_info->unbind (dev, intf);
1512
Paul Stewart68972ef2011-04-28 05:43:37 +00001513 usb_kill_urb(dev->interrupt);
1514 usb_free_urb(dev->interrupt);
Ming Lei60e453a2013-09-23 20:59:35 +08001515 kfree(dev->padding_pkt);
Paul Stewart68972ef2011-04-28 05:43:37 +00001516
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517 free_netdev(net);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001518}
David Brownell38bde1d2005-08-31 09:52:45 -07001519EXPORT_SYMBOL_GPL(usbnet_disconnect);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001520
Stephen Hemminger777baa42009-03-20 19:35:54 +00001521static const struct net_device_ops usbnet_netdev_ops = {
1522 .ndo_open = usbnet_open,
1523 .ndo_stop = usbnet_stop,
1524 .ndo_start_xmit = usbnet_start_xmit,
1525 .ndo_tx_timeout = usbnet_tx_timeout,
1526 .ndo_change_mtu = usbnet_change_mtu,
1527 .ndo_set_mac_address = eth_mac_addr,
1528 .ndo_validate_addr = eth_validate_addr,
1529};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530
1531/*-------------------------------------------------------------------------*/
1532
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533// precondition: never called in_interrupt
1534
Marcel Holtmann225794f2009-10-02 05:15:26 +00001535static struct device_type wlan_type = {
1536 .name = "wlan",
1537};
1538
1539static struct device_type wwan_type = {
1540 .name = "wwan",
1541};
1542
David Brownell38bde1d2005-08-31 09:52:45 -07001543int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001544usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1545{
1546 struct usbnet *dev;
David Brownellcb1cebb2007-02-15 18:52:30 -08001547 struct net_device *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548 struct usb_host_interface *interface;
1549 struct driver_info *info;
1550 struct usb_device *xdev;
1551 int status;
David Brownell296c0242007-04-17 16:10:10 -07001552 const char *name;
Ming Leib0786b42010-11-01 07:11:54 -07001553 struct usb_driver *driver = to_usb_driver(udev->dev.driver);
1554
1555 /* usbnet already took usb runtime pm, so have to enable the feature
1556 * for usb interface, otherwise usb_autopm_get_interface may return
Alan Stern98f541c2013-05-01 12:13:54 -04001557 * failure if RUNTIME_PM is enabled.
Ming Leib0786b42010-11-01 07:11:54 -07001558 */
1559 if (!driver->supports_autosuspend) {
1560 driver->supports_autosuspend = 1;
1561 pm_runtime_enable(&udev->dev);
1562 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563
David Brownell296c0242007-04-17 16:10:10 -07001564 name = udev->dev.driver->name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565 info = (struct driver_info *) prod->driver_info;
1566 if (!info) {
David Brownell296c0242007-04-17 16:10:10 -07001567 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001568 return -ENODEV;
1569 }
1570 xdev = interface_to_usbdev (udev);
1571 interface = udev->cur_altsetting;
1572
Linus Torvalds1da177e2005-04-16 15:20:36 -07001573 status = -ENOMEM;
1574
1575 // set up our own records
1576 net = alloc_etherdev(sizeof(*dev));
Joe Perches41de8d42012-01-29 13:47:52 +00001577 if (!net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001578 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001579
Ben Hutchings0dacca72010-07-02 21:49:02 -07001580 /* netdev_printk() needs this so do it as early as possible */
1581 SET_NETDEV_DEV(net, &udev->dev);
1582
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583 dev = netdev_priv(net);
1584 dev->udev = xdev;
Oliver Neukuma11a6542007-08-03 13:52:19 +02001585 dev->intf = udev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001586 dev->driver_info = info;
David Brownell296c0242007-04-17 16:10:10 -07001587 dev->driver_name = name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001588 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1589 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
Oliver Neukum14a0d632014-03-26 14:32:51 +01001590 init_waitqueue_head(&dev->wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001591 skb_queue_head_init (&dev->rxq);
1592 skb_queue_head_init (&dev->txq);
1593 skb_queue_head_init (&dev->done);
Jussi Kivilinna7834ddb2009-08-11 22:57:16 +03001594 skb_queue_head_init(&dev->rxq_pause);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001595 dev->bh.func = usbnet_bh;
1596 dev->bh.data = (unsigned long) dev;
David Howellsc4028952006-11-22 14:57:56 +00001597 INIT_WORK (&dev->kevent, kevent);
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001598 init_usb_anchor(&dev->deferred);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001599 dev->delay.function = usbnet_bh;
1600 dev->delay.data = (unsigned long) dev;
1601 init_timer (&dev->delay);
Arnd Bergmanna9fc6332006-10-09 00:08:02 +02001602 mutex_init (&dev->phy_mutex);
Dan Williams6eecdc52013-05-06 11:29:23 +00001603 mutex_init(&dev->interrupt_mutex);
1604 dev->interrupt_count = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001605
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606 dev->net = net;
1607 strcpy (net->name, "usb%d");
1608 memcpy (net->dev_addr, node_id, sizeof node_id);
1609
David Brownell2e55cc72005-08-31 09:53:10 -07001610 /* rx and tx sides can use different message sizes;
1611 * bind() should set rx_urb_size in that case.
1612 */
1613 dev->hard_mtu = net->mtu + net->hard_header_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614#if 0
1615// dma_supported() is deeply broken on almost all architectures
1616 // possible with some EHCI controllers
Yang Hongyang6a355282009-04-06 19:01:13 -07001617 if (dma_supported (&udev->dev, DMA_BIT_MASK(64)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001618 net->features |= NETIF_F_HIGHDMA;
1619#endif
1620
Stephen Hemminger777baa42009-03-20 19:35:54 +00001621 net->netdev_ops = &usbnet_netdev_ops;
Stephen Hemminger777baa42009-03-20 19:35:54 +00001622 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001623 net->ethtool_ops = &usbnet_ethtool_ops;
1624
1625 // allow device-specific bind/init procedures
1626 // NOTE net->name still not usable ...
1627 if (info->bind) {
1628 status = info->bind (dev, udev);
David Brownellcb1cebb2007-02-15 18:52:30 -08001629 if (status < 0)
1630 goto out1;
1631
Linus Torvalds1da177e2005-04-16 15:20:36 -07001632 // heuristic: "usb%d" for links we know are two-host,
1633 // else "eth%d" when there's reasonable doubt. userspace
1634 // can rename the link if it knows better.
Joe Perches8e95a202009-12-03 07:58:21 +00001635 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
Arnd Bergmannc2613442011-04-01 20:12:02 -07001636 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 ||
1637 (net->dev_addr [0] & 0x02) == 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001638 strcpy (net->name, "eth%d");
Jussi Kivilinna6e3bbcc2008-01-26 00:51:06 +02001639 /* WLAN devices should always be named "wlan%d" */
1640 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1641 strcpy(net->name, "wlan%d");
Marcel Holtmanne1e499e2009-10-02 05:15:25 +00001642 /* WWAN devices should always be named "wwan%d" */
1643 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1644 strcpy(net->name, "wwan%d");
David Brownellf29fc252005-08-31 09:52:31 -07001645
Wei Shuai65091412013-01-21 06:00:31 +00001646 /* devices that cannot do ARP */
1647 if ((dev->driver_info->flags & FLAG_NOARP) != 0)
1648 net->flags |= IFF_NOARP;
1649
David Brownellf29fc252005-08-31 09:52:31 -07001650 /* maybe the remote can't receive an Ethernet MTU */
1651 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1652 net->mtu = dev->hard_mtu - net->hard_header_len;
David Brownell2e55cc72005-08-31 09:53:10 -07001653 } else if (!info->in || !info->out)
1654 status = usbnet_get_endpoints (dev, udev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655 else {
1656 dev->in = usb_rcvbulkpipe (xdev, info->in);
1657 dev->out = usb_sndbulkpipe (xdev, info->out);
1658 if (!(info->flags & FLAG_NO_SETINT))
1659 status = usb_set_interface (xdev,
1660 interface->desc.bInterfaceNumber,
1661 interface->desc.bAlternateSetting);
1662 else
1663 status = 0;
1664
1665 }
Peter Korsgaard9514bfe2007-07-03 00:46:42 +02001666 if (status >= 0 && dev->status)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001667 status = init_status (dev, udev);
1668 if (status < 0)
David Brownellcb1cebb2007-02-15 18:52:30 -08001669 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670
David Brownell2e55cc72005-08-31 09:53:10 -07001671 if (!dev->rx_urb_size)
1672 dev->rx_urb_size = dev->hard_mtu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001673 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
David Brownellcb1cebb2007-02-15 18:52:30 -08001674
Bjørn Morkeef23b52013-09-04 09:42:32 +02001675 /* let userspace know we have a random address */
1676 if (ether_addr_equal(net->dev_addr, node_id))
1677 net->addr_assign_type = NET_ADDR_RANDOM;
1678
Marcel Holtmann225794f2009-10-02 05:15:26 +00001679 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1680 SET_NETDEV_DEVTYPE(net, &wlan_type);
1681 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1682 SET_NETDEV_DEVTYPE(net, &wwan_type);
1683
Ming Leia88c32a2013-07-25 13:47:53 +08001684 /* initialize max rx_qlen and tx_qlen */
1685 usbnet_update_max_qlen(dev);
1686
Ming Lei60e453a2013-09-23 20:59:35 +08001687 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) &&
1688 !(info->flags & FLAG_MULTI_PACKET)) {
1689 dev->padding_pkt = kzalloc(1, GFP_KERNEL);
Wei Yongjun09b69022013-10-12 14:24:08 +08001690 if (!dev->padding_pkt) {
1691 status = -ENOMEM;
Ming Lei60e453a2013-09-23 20:59:35 +08001692 goto out4;
Wei Yongjun09b69022013-10-12 14:24:08 +08001693 }
Ming Lei60e453a2013-09-23 20:59:35 +08001694 }
1695
Linus Torvalds1da177e2005-04-16 15:20:36 -07001696 status = register_netdev (net);
1697 if (status)
Ming Lei60e453a2013-09-23 20:59:35 +08001698 goto out5;
Joe Perchesa475f602010-02-17 10:30:24 +00001699 netif_info(dev, probe, dev->net,
1700 "register '%s' at usb-%s-%s, %s, %pM\n",
1701 udev->dev.driver->name,
1702 xdev->bus->bus_name, xdev->devpath,
1703 dev->driver_info->description,
1704 net->dev_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001705
1706 // ok, it's ready to go.
1707 usb_set_intfdata (udev, dev);
1708
Linus Torvalds1da177e2005-04-16 15:20:36 -07001709 netif_device_attach (net);
1710
Ben Hutchings37e82732009-11-04 15:29:52 +00001711 if (dev->driver_info->flags & FLAG_LINK_INTR)
Ming Lei0162c552013-04-11 04:40:39 +00001712 usbnet_link_change(dev, 0, 0);
Ben Hutchings37e82732009-11-04 15:29:52 +00001713
Linus Torvalds1da177e2005-04-16 15:20:36 -07001714 return 0;
1715
Ming Lei60e453a2013-09-23 20:59:35 +08001716out5:
1717 kfree(dev->padding_pkt);
tom.leiming@gmail.coma4723842012-04-29 22:51:03 +00001718out4:
1719 usb_free_urb(dev->interrupt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720out3:
1721 if (info->unbind)
1722 info->unbind (dev, udev);
1723out1:
1724 free_netdev(net);
1725out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001726 return status;
1727}
David Brownell38bde1d2005-08-31 09:52:45 -07001728EXPORT_SYMBOL_GPL(usbnet_probe);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001729
1730/*-------------------------------------------------------------------------*/
1731
Oliver Neukum36433122007-04-30 01:37:44 -07001732/*
1733 * suspend the whole driver as soon as the first interface is suspended
1734 * resume only when the last interface is resumed
David Brownell38bde1d2005-08-31 09:52:45 -07001735 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001736
David Brownell38bde1d2005-08-31 09:52:45 -07001737int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001738{
1739 struct usbnet *dev = usb_get_intfdata(intf);
David Brownellcb1cebb2007-02-15 18:52:30 -08001740
Oliver Neukum36433122007-04-30 01:37:44 -07001741 if (!dev->suspend_count++) {
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001742 spin_lock_irq(&dev->txq.lock);
1743 /* don't autosuspend while transmitting */
Alan Stern5b1b0b82011-08-19 23:49:48 +02001744 if (dev->txq.qlen && PMSG_IS_AUTO(message)) {
Ming Lei5eeb3132012-06-19 21:15:52 +00001745 dev->suspend_count--;
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001746 spin_unlock_irq(&dev->txq.lock);
1747 return -EBUSY;
1748 } else {
1749 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1750 spin_unlock_irq(&dev->txq.lock);
1751 }
Oliver Neukuma11a6542007-08-03 13:52:19 +02001752 /*
1753 * accelerate emptying of the rx and queues, to avoid
Oliver Neukum36433122007-04-30 01:37:44 -07001754 * having everything error out.
1755 */
1756 netif_device_detach (dev->net);
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001757 usbnet_terminate_urbs(dev);
Dan Williams6eecdc52013-05-06 11:29:23 +00001758 __usbnet_status_stop_force(dev);
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001759
Oliver Neukuma11a6542007-08-03 13:52:19 +02001760 /*
1761 * reattach so runtime management can use and
1762 * wake the device
1763 */
1764 netif_device_attach (dev->net);
Oliver Neukum36433122007-04-30 01:37:44 -07001765 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001766 return 0;
1767}
David Brownell38bde1d2005-08-31 09:52:45 -07001768EXPORT_SYMBOL_GPL(usbnet_suspend);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001769
David Brownell38bde1d2005-08-31 09:52:45 -07001770int usbnet_resume (struct usb_interface *intf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001771{
1772 struct usbnet *dev = usb_get_intfdata(intf);
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001773 struct sk_buff *skb;
1774 struct urb *res;
1775 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001776
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001777 if (!--dev->suspend_count) {
Dan Williams6eecdc52013-05-06 11:29:23 +00001778 /* resume interrupt URB if it was previously submitted */
1779 __usbnet_status_start_force(dev, GFP_NOIO);
Paul Stewart68972ef2011-04-28 05:43:37 +00001780
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001781 spin_lock_irq(&dev->txq.lock);
1782 while ((res = usb_get_from_anchor(&dev->deferred))) {
1783
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001784 skb = (struct sk_buff *)res->context;
1785 retval = usb_submit_urb(res, GFP_ATOMIC);
1786 if (retval < 0) {
1787 dev_kfree_skb_any(skb);
Ming Lei638c5112013-08-08 21:48:24 +08001788 kfree(res->sg);
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001789 usb_free_urb(res);
1790 usb_autopm_put_interface_async(dev->intf);
1791 } else {
1792 dev->net->trans_start = jiffies;
1793 __skb_queue_tail(&dev->txq, skb);
1794 }
1795 }
1796
1797 smp_mb();
1798 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1799 spin_unlock_irq(&dev->txq.lock);
Ming Lei75bd0cb2011-04-28 22:37:09 +00001800
1801 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) {
Oliver Neukum14a0d632014-03-26 14:32:51 +01001802 /* handle remote wakeup ASAP
1803 * we cannot race against stop
1804 */
1805 if (netif_device_present(dev->net) &&
Ming Lei65841fd2012-06-19 21:15:53 +00001806 !timer_pending(&dev->delay) &&
1807 !test_bit(EVENT_RX_HALT, &dev->flags))
Oliver Neukumab6f1482012-08-26 20:41:38 +00001808 rx_alloc_submit(dev, GFP_NOIO);
Ming Lei65841fd2012-06-19 21:15:53 +00001809
Ming Lei75bd0cb2011-04-28 22:37:09 +00001810 if (!(dev->txq.qlen >= TX_QLEN(dev)))
Alexey Orishko1aa9bc52012-03-14 04:00:24 +00001811 netif_tx_wake_all_queues(dev->net);
Ming Lei75bd0cb2011-04-28 22:37:09 +00001812 tasklet_schedule (&dev->bh);
1813 }
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001814 }
Oliver Neukum5d9d01a32012-10-11 02:50:10 +00001815
1816 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags))
1817 usb_autopm_get_interface_no_resume(intf);
1818
Linus Torvalds1da177e2005-04-16 15:20:36 -07001819 return 0;
1820}
David Brownell38bde1d2005-08-31 09:52:45 -07001821EXPORT_SYMBOL_GPL(usbnet_resume);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001822
Oliver Neukum5d9d01a32012-10-11 02:50:10 +00001823/*
1824 * Either a subdriver implements manage_power, then it is assumed to always
1825 * be ready to be suspended or it reports the readiness to be suspended
1826 * explicitly
1827 */
1828void usbnet_device_suggests_idle(struct usbnet *dev)
1829{
1830 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) {
1831 dev->intf->needs_remote_wakeup = 1;
1832 usb_autopm_put_interface_async(dev->intf);
1833 }
1834}
1835EXPORT_SYMBOL(usbnet_device_suggests_idle);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001836
Oliver Neukum2dd7c8c2012-12-18 04:45:52 +00001837/*
1838 * For devices that can do without special commands
1839 */
1840int usbnet_manage_power(struct usbnet *dev, int on)
1841{
1842 dev->intf->needs_remote_wakeup = on;
1843 return 0;
1844}
1845EXPORT_SYMBOL(usbnet_manage_power);
1846
Ming Leiac649952013-04-11 04:40:30 +00001847void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset)
1848{
1849 /* update link after link is reseted */
1850 if (link && !need_reset)
1851 netif_carrier_on(dev->net);
1852 else
1853 netif_carrier_off(dev->net);
1854
1855 if (need_reset && link)
1856 usbnet_defer_kevent(dev, EVENT_LINK_RESET);
Ming Lei4b49f582013-04-11 04:40:40 +00001857 else
1858 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
Ming Leiac649952013-04-11 04:40:30 +00001859}
1860EXPORT_SYMBOL(usbnet_link_change);
1861
Linus Torvalds1da177e2005-04-16 15:20:36 -07001862/*-------------------------------------------------------------------------*/
Ming Lei0547fad2012-11-06 04:53:04 +00001863static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1864 u16 value, u16 index, void *data, u16 size)
Ming Lei877bd862012-10-24 19:46:54 +00001865{
1866 void *buf = NULL;
1867 int err = -ENOMEM;
1868
1869 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x"
1870 " value=0x%04x index=0x%04x size=%d\n",
1871 cmd, reqtype, value, index, size);
1872
1873 if (data) {
1874 buf = kmalloc(size, GFP_KERNEL);
1875 if (!buf)
1876 goto out;
1877 }
1878
1879 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
1880 cmd, reqtype, value, index, buf, size,
1881 USB_CTRL_GET_TIMEOUT);
1882 if (err > 0 && err <= size)
1883 memcpy(data, buf, err);
1884 kfree(buf);
1885out:
1886 return err;
1887}
Ming Lei877bd862012-10-24 19:46:54 +00001888
Ming Lei0547fad2012-11-06 04:53:04 +00001889static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1890 u16 value, u16 index, const void *data,
1891 u16 size)
Ming Lei877bd862012-10-24 19:46:54 +00001892{
1893 void *buf = NULL;
1894 int err = -ENOMEM;
1895
1896 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
1897 " value=0x%04x index=0x%04x size=%d\n",
1898 cmd, reqtype, value, index, size);
1899
1900 if (data) {
1901 buf = kmemdup(data, size, GFP_KERNEL);
1902 if (!buf)
1903 goto out;
1904 }
1905
1906 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
1907 cmd, reqtype, value, index, buf, size,
1908 USB_CTRL_SET_TIMEOUT);
1909 kfree(buf);
1910
1911out:
1912 return err;
1913}
Ming Lei0547fad2012-11-06 04:53:04 +00001914
1915/*
1916 * The function can't be called inside suspend/resume callback,
1917 * otherwise deadlock will be caused.
1918 */
1919int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1920 u16 value, u16 index, void *data, u16 size)
1921{
Ming Lei6f0a0982012-11-06 04:53:08 +00001922 int ret;
1923
1924 if (usb_autopm_get_interface(dev->intf) < 0)
1925 return -ENODEV;
1926 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index,
1927 data, size);
1928 usb_autopm_put_interface(dev->intf);
1929 return ret;
Ming Lei0547fad2012-11-06 04:53:04 +00001930}
1931EXPORT_SYMBOL_GPL(usbnet_read_cmd);
1932
1933/*
1934 * The function can't be called inside suspend/resume callback,
1935 * otherwise deadlock will be caused.
1936 */
1937int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1938 u16 value, u16 index, const void *data, u16 size)
1939{
Ming Lei6f0a0982012-11-06 04:53:08 +00001940 int ret;
1941
1942 if (usb_autopm_get_interface(dev->intf) < 0)
1943 return -ENODEV;
1944 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index,
1945 data, size);
1946 usb_autopm_put_interface(dev->intf);
1947 return ret;
Ming Lei0547fad2012-11-06 04:53:04 +00001948}
Ming Lei877bd862012-10-24 19:46:54 +00001949EXPORT_SYMBOL_GPL(usbnet_write_cmd);
1950
Ming Lei0547fad2012-11-06 04:53:04 +00001951/*
1952 * The function can be called inside suspend/resume callback safely
1953 * and should only be called by suspend/resume callback generally.
1954 */
1955int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
1956 u16 value, u16 index, void *data, u16 size)
1957{
1958 return __usbnet_read_cmd(dev, cmd, reqtype, value, index,
1959 data, size);
1960}
1961EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm);
1962
1963/*
1964 * The function can be called inside suspend/resume callback safely
1965 * and should only be called by suspend/resume callback generally.
1966 */
1967int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
1968 u16 value, u16 index, const void *data,
1969 u16 size)
1970{
1971 return __usbnet_write_cmd(dev, cmd, reqtype, value, index,
1972 data, size);
1973}
1974EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm);
1975
Ming Lei877bd862012-10-24 19:46:54 +00001976static void usbnet_async_cmd_cb(struct urb *urb)
1977{
1978 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;
1979 int status = urb->status;
1980
1981 if (status < 0)
1982 dev_dbg(&urb->dev->dev, "%s failed with %d",
1983 __func__, status);
1984
1985 kfree(req);
1986 usb_free_urb(urb);
1987}
1988
Ming Lei0547fad2012-11-06 04:53:04 +00001989/*
1990 * The caller must make sure that device can't be put into suspend
1991 * state until the control URB completes.
1992 */
Ming Lei877bd862012-10-24 19:46:54 +00001993int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,
1994 u16 value, u16 index, const void *data, u16 size)
1995{
1996 struct usb_ctrlrequest *req = NULL;
1997 struct urb *urb;
1998 int err = -ENOMEM;
1999 void *buf = NULL;
2000
2001 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
2002 " value=0x%04x index=0x%04x size=%d\n",
2003 cmd, reqtype, value, index, size);
2004
2005 urb = usb_alloc_urb(0, GFP_ATOMIC);
2006 if (!urb) {
2007 netdev_err(dev->net, "Error allocating URB in"
2008 " %s!\n", __func__);
2009 goto fail;
2010 }
2011
2012 if (data) {
2013 buf = kmemdup(data, size, GFP_ATOMIC);
2014 if (!buf) {
2015 netdev_err(dev->net, "Error allocating buffer"
2016 " in %s!\n", __func__);
2017 goto fail_free;
2018 }
2019 }
2020
2021 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
Joe Perches38673c82013-02-03 17:28:11 +00002022 if (!req)
Ming Lei877bd862012-10-24 19:46:54 +00002023 goto fail_free_buf;
Ming Lei877bd862012-10-24 19:46:54 +00002024
2025 req->bRequestType = reqtype;
2026 req->bRequest = cmd;
2027 req->wValue = cpu_to_le16(value);
2028 req->wIndex = cpu_to_le16(index);
2029 req->wLength = cpu_to_le16(size);
2030
2031 usb_fill_control_urb(urb, dev->udev,
2032 usb_sndctrlpipe(dev->udev, 0),
2033 (void *)req, buf, size,
2034 usbnet_async_cmd_cb, req);
2035 urb->transfer_flags |= URB_FREE_BUFFER;
2036
2037 err = usb_submit_urb(urb, GFP_ATOMIC);
2038 if (err < 0) {
2039 netdev_err(dev->net, "Error submitting the control"
2040 " message: status=%d\n", err);
2041 goto fail_free;
2042 }
2043 return 0;
2044
2045fail_free_buf:
2046 kfree(buf);
2047fail_free:
2048 kfree(req);
2049 usb_free_urb(urb);
2050fail:
2051 return err;
2052
2053}
2054EXPORT_SYMBOL_GPL(usbnet_write_cmd_async);
2055/*-------------------------------------------------------------------------*/
Linus Torvalds1da177e2005-04-16 15:20:36 -07002056
David Brownellf29fc252005-08-31 09:52:31 -07002057static int __init usbnet_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002058{
Thiago Farinac582a952011-04-17 17:49:21 -07002059 /* Compiler should optimize this out. */
2060 BUILD_BUG_ON(
2061 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002062
Joe Perchesc7e12ea2012-07-12 19:33:07 +00002063 eth_random_addr(node_id);
David Brownellcb1cebb2007-02-15 18:52:30 -08002064 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002065}
David Brownellf29fc252005-08-31 09:52:31 -07002066module_init(usbnet_init);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002067
David Brownellf29fc252005-08-31 09:52:31 -07002068static void __exit usbnet_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002069{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002070}
David Brownellf29fc252005-08-31 09:52:31 -07002071module_exit(usbnet_exit);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002072
David Brownellf29fc252005-08-31 09:52:31 -07002073MODULE_AUTHOR("David Brownell");
David Brownell090ffa92005-08-31 09:54:50 -07002074MODULE_DESCRIPTION("USB network driver framework");
David Brownellf29fc252005-08-31 09:52:31 -07002075MODULE_LICENSE("GPL");