blob: ed9a41643ff41f26afe6b6c4f8916137f4baed0d [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
David Brownell090ffa92005-08-31 09:54:50 -07002 * USB Network driver infrastructure
David Brownellf29fc252005-08-31 09:52:31 -07003 * Copyright (C) 2000-2005 by David Brownell
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21/*
22 * This is a generic "USB networking" framework that works with several
David Brownell090ffa92005-08-31 09:54:50 -070023 * kinds of full and high speed networking devices: host-to-host cables,
24 * smart usb peripherals, and actual Ethernet adapters.
Linus Torvalds1da177e2005-04-16 15:20:36 -070025 *
David Brownell090ffa92005-08-31 09:54:50 -070026 * These devices usually differ in terms of control protocols (if they
27 * even have one!) and sometimes they define new framing to wrap or batch
28 * Ethernet packets. Otherwise, they talk to USB pretty much the same,
29 * so interface (un)binding, endpoint I/O queues, fault handling, and other
30 * issues can usefully be addressed by this framework.
31 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
33// #define DEBUG // error path messages, extra info
34// #define VERBOSE // more; success messages
35
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include <linux/init.h>
38#include <linux/netdevice.h>
39#include <linux/etherdevice.h>
Peter Holik03ad0322009-04-18 07:24:17 +000040#include <linux/ctype.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <linux/ethtool.h>
42#include <linux/workqueue.h>
43#include <linux/mii.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include <linux/usb.h>
Jussi Kivilinna3692e942008-01-26 00:51:45 +020045#include <linux/usb/usbnet.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090046#include <linux/slab.h>
Andy Shevchenkofd1f1702010-07-23 03:18:08 +000047#include <linux/kernel.h>
Ming Leib0786b42010-11-01 07:11:54 -070048#include <linux/pm_runtime.h>
David Brownellf29fc252005-08-31 09:52:31 -070049
50#define DRIVER_VERSION "22-Aug-2005"
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
52
53/*-------------------------------------------------------------------------*/
54
55/*
56 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max.
57 * Several dozen bytes of IPv4 data can fit in two such transactions.
58 * One maximum size Ethernet packet takes twenty four of them.
59 * For high speed, each frame comfortably fits almost 36 max size
60 * Ethernet packets (so queues should be bigger).
David Brownellf29fc252005-08-31 09:52:31 -070061 *
62 * REVISIT qlens should be members of 'struct usbnet'; the goal is to
63 * let the USB host controller be busy for 5msec or more before an irq
64 * is required, under load. Jumbograms change the equation.
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 */
Jamie Paintera99c1942006-07-27 14:17:28 -040066#define RX_MAX_QUEUE_MEMORY (60 * 1518)
67#define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
68 (RX_MAX_QUEUE_MEMORY/(dev)->rx_urb_size) : 4)
69#define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
70 (RX_MAX_QUEUE_MEMORY/(dev)->hard_mtu) : 4)
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
Linus Torvalds1da177e2005-04-16 15:20:36 -070072// reawaken network queue this soon after stopping; else watchdog barks
73#define TX_TIMEOUT_JIFFIES (5*HZ)
74
75// throttle rx/tx briefly after some faults, so khubd might disconnect()
76// us (it polls at HZ/4 usually) before we report too many false errors.
77#define THROTTLE_JIFFIES (HZ/8)
78
Linus Torvalds1da177e2005-04-16 15:20:36 -070079// between wakeups
80#define UNLINK_TIMEOUT_MS 3
81
82/*-------------------------------------------------------------------------*/
83
84// randomly generated ethernet address
85static u8 node_id [ETH_ALEN];
86
Linus Torvalds1da177e2005-04-16 15:20:36 -070087static const char driver_name [] = "usbnet";
88
89/* use ethtool to change the level for any given device */
90static int msg_level = -1;
91module_param (msg_level, int, 0);
92MODULE_PARM_DESC (msg_level, "Override default message level");
93
Linus Torvalds1da177e2005-04-16 15:20:36 -070094/*-------------------------------------------------------------------------*/
95
Linus Torvalds1da177e2005-04-16 15:20:36 -070096/* handles CDC Ethernet and many other network "bulk data" interfaces */
David Brownell2e55cc72005-08-31 09:53:10 -070097int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
Linus Torvalds1da177e2005-04-16 15:20:36 -070098{
99 int tmp;
100 struct usb_host_interface *alt = NULL;
101 struct usb_host_endpoint *in = NULL, *out = NULL;
102 struct usb_host_endpoint *status = NULL;
103
104 for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
105 unsigned ep;
106
107 in = out = status = NULL;
108 alt = intf->altsetting + tmp;
109
110 /* take the first altsetting with in-bulk + out-bulk;
111 * remember any status endpoint, just in case;
112 * ignore other endpoints and altsetttings.
113 */
114 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
115 struct usb_host_endpoint *e;
116 int intr = 0;
117
118 e = alt->endpoint + ep;
119 switch (e->desc.bmAttributes) {
120 case USB_ENDPOINT_XFER_INT:
Luiz Fernando N. Capitulinofc6e2542006-10-26 13:03:01 -0300121 if (!usb_endpoint_dir_in(&e->desc))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 continue;
123 intr = 1;
124 /* FALLTHROUGH */
125 case USB_ENDPOINT_XFER_BULK:
126 break;
127 default:
128 continue;
129 }
Luiz Fernando N. Capitulinofc6e2542006-10-26 13:03:01 -0300130 if (usb_endpoint_dir_in(&e->desc)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 if (!intr && !in)
132 in = e;
133 else if (intr && !status)
134 status = e;
135 } else {
136 if (!out)
137 out = e;
138 }
139 }
140 if (in && out)
141 break;
142 }
143 if (!alt || !in || !out)
144 return -EINVAL;
145
Joe Perches8e95a202009-12-03 07:58:21 +0000146 if (alt->desc.bAlternateSetting != 0 ||
147 !(dev->driver_info->flags & FLAG_NO_SETINT)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber,
149 alt->desc.bAlternateSetting);
150 if (tmp < 0)
151 return tmp;
152 }
David Brownellcb1cebb2007-02-15 18:52:30 -0800153
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 dev->in = usb_rcvbulkpipe (dev->udev,
155 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
156 dev->out = usb_sndbulkpipe (dev->udev,
157 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
158 dev->status = status;
159 return 0;
160}
David Brownell2e55cc72005-08-31 09:53:10 -0700161EXPORT_SYMBOL_GPL(usbnet_get_endpoints);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162
Peter Holik03ad0322009-04-18 07:24:17 +0000163int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress)
164{
165 int tmp, i;
166 unsigned char buf [13];
167
168 tmp = usb_string(dev->udev, iMACAddress, buf, sizeof buf);
169 if (tmp != 12) {
170 dev_dbg(&dev->udev->dev,
171 "bad MAC string %d fetch, %d\n", iMACAddress, tmp);
172 if (tmp >= 0)
173 tmp = -EINVAL;
174 return tmp;
175 }
176 for (i = tmp = 0; i < 6; i++, tmp += 2)
177 dev->net->dev_addr [i] =
Andy Shevchenkofd1f1702010-07-23 03:18:08 +0000178 (hex_to_bin(buf[tmp]) << 4) + hex_to_bin(buf[tmp + 1]);
Peter Holik03ad0322009-04-18 07:24:17 +0000179 return 0;
180}
181EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr);
182
David Howells7d12e782006-10-05 14:55:46 +0100183static void intr_complete (struct urb *urb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184
185static int init_status (struct usbnet *dev, struct usb_interface *intf)
186{
187 char *buf = NULL;
188 unsigned pipe = 0;
189 unsigned maxp;
190 unsigned period;
191
192 if (!dev->driver_info->status)
193 return 0;
194
195 pipe = usb_rcvintpipe (dev->udev,
196 dev->status->desc.bEndpointAddress
197 & USB_ENDPOINT_NUMBER_MASK);
198 maxp = usb_maxpacket (dev->udev, pipe, 0);
199
200 /* avoid 1 msec chatter: min 8 msec poll rate */
201 period = max ((int) dev->status->desc.bInterval,
202 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3);
203
Christoph Lametere94b1762006-12-06 20:33:17 -0800204 buf = kmalloc (maxp, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 if (buf) {
Christoph Lametere94b1762006-12-06 20:33:17 -0800206 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 if (!dev->interrupt) {
208 kfree (buf);
209 return -ENOMEM;
210 } else {
211 usb_fill_int_urb(dev->interrupt, dev->udev, pipe,
212 buf, maxp, intr_complete, dev, period);
213 dev_dbg(&intf->dev,
214 "status ep%din, %d bytes period %d\n",
215 usb_pipeendpoint(pipe), maxp, period);
216 }
217 }
David Brownell18ab4582007-05-25 12:31:32 -0700218 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219}
220
David Brownell2e55cc72005-08-31 09:53:10 -0700221/* Passes this packet up the stack, updating its accounting.
222 * Some link protocols batch packets, so their rx_fixup paths
223 * can return clones as well as just modify the original skb.
224 */
225void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226{
227 int status;
228
Jussi Kivilinna7834ddb2009-08-11 22:57:16 +0300229 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) {
230 skb_queue_tail(&dev->rxq_pause, skb);
231 return;
232 }
233
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 skb->protocol = eth_type_trans (skb, dev->net);
Herbert Xu79638372009-06-29 16:53:28 +0000235 dev->net->stats.rx_packets++;
236 dev->net->stats.rx_bytes += skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237
Joe Perchesa475f602010-02-17 10:30:24 +0000238 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n",
239 skb->len + sizeof (struct ethhdr), skb->protocol);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 memset (skb->cb, 0, sizeof (struct skb_data));
241 status = netif_rx (skb);
Joe Perchesa475f602010-02-17 10:30:24 +0000242 if (status != NET_RX_SUCCESS)
243 netif_dbg(dev, rx_err, dev->net,
244 "netif_rx status %d\n", status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245}
David Brownell2e55cc72005-08-31 09:53:10 -0700246EXPORT_SYMBOL_GPL(usbnet_skb_return);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247
248
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249/*-------------------------------------------------------------------------
250 *
251 * Network Device Driver (peer link to "Host Device", from USB host)
252 *
253 *-------------------------------------------------------------------------*/
254
Stephen Hemminger777baa42009-03-20 19:35:54 +0000255int usbnet_change_mtu (struct net_device *net, int new_mtu)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256{
257 struct usbnet *dev = netdev_priv(net);
David Brownellf29fc252005-08-31 09:52:31 -0700258 int ll_mtu = new_mtu + net->hard_header_len;
Jamie Paintera99c1942006-07-27 14:17:28 -0400259 int old_hard_mtu = dev->hard_mtu;
260 int old_rx_urb_size = dev->rx_urb_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261
Jamie Paintera99c1942006-07-27 14:17:28 -0400262 if (new_mtu <= 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 // no second zero-length packet read wanted after mtu-sized packets
David Brownellf29fc252005-08-31 09:52:31 -0700265 if ((ll_mtu % dev->maxpacket) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 return -EDOM;
267 net->mtu = new_mtu;
Jamie Paintera99c1942006-07-27 14:17:28 -0400268
269 dev->hard_mtu = net->mtu + net->hard_header_len;
270 if (dev->rx_urb_size == old_hard_mtu) {
271 dev->rx_urb_size = dev->hard_mtu;
272 if (dev->rx_urb_size > old_rx_urb_size)
273 usbnet_unlink_rx_urbs(dev);
274 }
275
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 return 0;
277}
Stephen Hemminger777baa42009-03-20 19:35:54 +0000278EXPORT_SYMBOL_GPL(usbnet_change_mtu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279
280/*-------------------------------------------------------------------------*/
281
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282/* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
283 * completion callbacks. 2.5 should have fixed those bugs...
284 */
285
David S. Miller8728b832005-08-09 19:25:21 -0700286static void defer_bh(struct usbnet *dev, struct sk_buff *skb, struct sk_buff_head *list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 unsigned long flags;
289
David S. Miller8728b832005-08-09 19:25:21 -0700290 spin_lock_irqsave(&list->lock, flags);
291 __skb_unlink(skb, list);
292 spin_unlock(&list->lock);
293 spin_lock(&dev->done.lock);
294 __skb_queue_tail(&dev->done, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 if (dev->done.qlen == 1)
David S. Miller8728b832005-08-09 19:25:21 -0700296 tasklet_schedule(&dev->bh);
297 spin_unlock_irqrestore(&dev->done.lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298}
299
300/* some work can't be done in tasklets, so we use keventd
301 *
302 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
303 * but tasklet_schedule() doesn't. hope the failure is rare.
304 */
David Brownell2e55cc72005-08-31 09:53:10 -0700305void usbnet_defer_kevent (struct usbnet *dev, int work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306{
307 set_bit (work, &dev->flags);
308 if (!schedule_work (&dev->kevent))
Joe Perches60b86752010-02-17 10:30:23 +0000309 netdev_err(dev->net, "kevent %d may have been dropped\n", work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 else
Joe Perches60b86752010-02-17 10:30:23 +0000311 netdev_dbg(dev->net, "kevent %d scheduled\n", work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312}
David Brownell2e55cc72005-08-31 09:53:10 -0700313EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
315/*-------------------------------------------------------------------------*/
316
David Howells7d12e782006-10-05 14:55:46 +0100317static void rx_complete (struct urb *urb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318
David S. Millerdacb3972010-08-10 02:50:55 -0700319static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320{
321 struct sk_buff *skb;
322 struct skb_data *entry;
323 int retval = 0;
324 unsigned long lockflags;
David Brownell2e55cc72005-08-31 09:53:10 -0700325 size_t size = dev->rx_urb_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 if ((skb = alloc_skb (size + NET_IP_ALIGN, flags)) == NULL) {
Joe Perchesa475f602010-02-17 10:30:24 +0000328 netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
David Brownell2e55cc72005-08-31 09:53:10 -0700329 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 usb_free_urb (urb);
David S. Millerdacb3972010-08-10 02:50:55 -0700331 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 }
333 skb_reserve (skb, NET_IP_ALIGN);
334
335 entry = (struct skb_data *) skb->cb;
336 entry->urb = urb;
337 entry->dev = dev;
338 entry->state = rx_start;
339 entry->length = 0;
340
341 usb_fill_bulk_urb (urb, dev->udev, dev->in,
342 skb->data, size, rx_complete, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343
344 spin_lock_irqsave (&dev->rxq.lock, lockflags);
345
Joe Perches8e95a202009-12-03 07:58:21 +0000346 if (netif_running (dev->net) &&
347 netif_device_present (dev->net) &&
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800348 !test_bit (EVENT_RX_HALT, &dev->flags) &&
349 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
David Brownell18ab4582007-05-25 12:31:32 -0700350 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 case -EPIPE:
David Brownell2e55cc72005-08-31 09:53:10 -0700352 usbnet_defer_kevent (dev, EVENT_RX_HALT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 break;
354 case -ENOMEM:
David Brownell2e55cc72005-08-31 09:53:10 -0700355 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 break;
357 case -ENODEV:
Joe Perchesa475f602010-02-17 10:30:24 +0000358 netif_dbg(dev, ifdown, dev->net, "device gone\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 netif_device_detach (dev->net);
360 break;
David S. Millerdacb3972010-08-10 02:50:55 -0700361 case -EHOSTUNREACH:
362 retval = -ENOLINK;
363 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 default:
Joe Perchesa475f602010-02-17 10:30:24 +0000365 netif_dbg(dev, rx_err, dev->net,
366 "rx submit, %d\n", retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 tasklet_schedule (&dev->bh);
368 break;
369 case 0:
370 __skb_queue_tail (&dev->rxq, skb);
371 }
372 } else {
Joe Perchesa475f602010-02-17 10:30:24 +0000373 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 retval = -ENOLINK;
375 }
376 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
377 if (retval) {
378 dev_kfree_skb_any (skb);
379 usb_free_urb (urb);
380 }
David S. Millerdacb3972010-08-10 02:50:55 -0700381 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382}
383
384
385/*-------------------------------------------------------------------------*/
386
387static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
388{
Joe Perches8e95a202009-12-03 07:58:21 +0000389 if (dev->driver_info->rx_fixup &&
390 !dev->driver_info->rx_fixup (dev, skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 goto error;
392 // else network stack removes extra byte if we forced a short packet
393
Alexey Orishko073285f2010-11-29 23:23:27 +0000394 if (skb->len) {
395 /* all data was already cloned from skb inside the driver */
396 if (dev->driver_info->flags & FLAG_MULTI_PACKET)
397 dev_kfree_skb_any(skb);
398 else
399 usbnet_skb_return(dev, skb);
400 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 }
Alexey Orishko073285f2010-11-29 23:23:27 +0000402
403 netif_dbg(dev, rx_err, dev->net, "drop\n");
404error:
405 dev->net->stats.rx_errors++;
406 skb_queue_tail(&dev->done, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407}
408
409/*-------------------------------------------------------------------------*/
410
David Howells7d12e782006-10-05 14:55:46 +0100411static void rx_complete (struct urb *urb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412{
413 struct sk_buff *skb = (struct sk_buff *) urb->context;
414 struct skb_data *entry = (struct skb_data *) skb->cb;
415 struct usbnet *dev = entry->dev;
416 int urb_status = urb->status;
417
418 skb_put (skb, urb->actual_length);
419 entry->state = rx_done;
420 entry->urb = NULL;
421
422 switch (urb_status) {
David Brownell18ab4582007-05-25 12:31:32 -0700423 /* success */
424 case 0:
David Brownellf29fc252005-08-31 09:52:31 -0700425 if (skb->len < dev->net->hard_header_len) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 entry->state = rx_cleanup;
Herbert Xu79638372009-06-29 16:53:28 +0000427 dev->net->stats.rx_errors++;
428 dev->net->stats.rx_length_errors++;
Joe Perchesa475f602010-02-17 10:30:24 +0000429 netif_dbg(dev, rx_err, dev->net,
430 "rx length %d\n", skb->len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 }
432 break;
433
David Brownell18ab4582007-05-25 12:31:32 -0700434 /* stalls need manual reset. this is rare ... except that
435 * when going through USB 2.0 TTs, unplug appears this way.
Jean Delvare3ac49a12009-06-04 16:20:28 +0200436 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
David Brownell18ab4582007-05-25 12:31:32 -0700437 * storm, recovering as needed.
438 */
439 case -EPIPE:
Herbert Xu79638372009-06-29 16:53:28 +0000440 dev->net->stats.rx_errors++;
David Brownell2e55cc72005-08-31 09:53:10 -0700441 usbnet_defer_kevent (dev, EVENT_RX_HALT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 // FALLTHROUGH
443
David Brownell18ab4582007-05-25 12:31:32 -0700444 /* software-driven interface shutdown */
445 case -ECONNRESET: /* async unlink */
446 case -ESHUTDOWN: /* hardware gone */
Joe Perchesa475f602010-02-17 10:30:24 +0000447 netif_dbg(dev, ifdown, dev->net,
448 "rx shutdown, code %d\n", urb_status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 goto block;
450
David Brownell18ab4582007-05-25 12:31:32 -0700451 /* we get controller i/o faults during khubd disconnect() delays.
452 * throttle down resubmits, to avoid log floods; just temporarily,
453 * so we still recover when the fault isn't a khubd delay.
454 */
455 case -EPROTO:
456 case -ETIME:
457 case -EILSEQ:
Herbert Xu79638372009-06-29 16:53:28 +0000458 dev->net->stats.rx_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 if (!timer_pending (&dev->delay)) {
460 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
Joe Perchesa475f602010-02-17 10:30:24 +0000461 netif_dbg(dev, link, dev->net,
462 "rx throttle %d\n", urb_status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 }
464block:
465 entry->state = rx_cleanup;
466 entry->urb = urb;
467 urb = NULL;
468 break;
469
David Brownell18ab4582007-05-25 12:31:32 -0700470 /* data overrun ... flush fifo? */
471 case -EOVERFLOW:
Herbert Xu79638372009-06-29 16:53:28 +0000472 dev->net->stats.rx_over_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 // FALLTHROUGH
David Brownellcb1cebb2007-02-15 18:52:30 -0800474
David Brownell18ab4582007-05-25 12:31:32 -0700475 default:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 entry->state = rx_cleanup;
Herbert Xu79638372009-06-29 16:53:28 +0000477 dev->net->stats.rx_errors++;
Joe Perchesa475f602010-02-17 10:30:24 +0000478 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 break;
480 }
481
David S. Miller8728b832005-08-09 19:25:21 -0700482 defer_bh(dev, skb, &dev->rxq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483
484 if (urb) {
Joe Perches8e95a202009-12-03 07:58:21 +0000485 if (netif_running (dev->net) &&
486 !test_bit (EVENT_RX_HALT, &dev->flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 rx_submit (dev, urb, GFP_ATOMIC);
488 return;
489 }
490 usb_free_urb (urb);
491 }
Joe Perchesa475f602010-02-17 10:30:24 +0000492 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493}
494
David Howells7d12e782006-10-05 14:55:46 +0100495static void intr_complete (struct urb *urb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496{
497 struct usbnet *dev = urb->context;
498 int status = urb->status;
499
500 switch (status) {
David Brownell18ab4582007-05-25 12:31:32 -0700501 /* success */
502 case 0:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 dev->driver_info->status(dev, urb);
504 break;
505
David Brownell18ab4582007-05-25 12:31:32 -0700506 /* software-driven interface shutdown */
507 case -ENOENT: /* urb killed */
508 case -ESHUTDOWN: /* hardware gone */
Joe Perchesa475f602010-02-17 10:30:24 +0000509 netif_dbg(dev, ifdown, dev->net,
510 "intr shutdown, code %d\n", status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 return;
512
David Brownell18ab4582007-05-25 12:31:32 -0700513 /* NOTE: not throttling like RX/TX, since this endpoint
514 * already polls infrequently
515 */
516 default:
Joe Perches60b86752010-02-17 10:30:23 +0000517 netdev_dbg(dev->net, "intr status %d\n", status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 break;
519 }
520
521 if (!netif_running (dev->net))
522 return;
523
524 memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
525 status = usb_submit_urb (urb, GFP_ATOMIC);
Joe Perchesa475f602010-02-17 10:30:24 +0000526 if (status != 0)
527 netif_err(dev, timer, dev->net,
528 "intr resubmit --> %d\n", status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529}
530
531/*-------------------------------------------------------------------------*/
Jussi Kivilinna7834ddb2009-08-11 22:57:16 +0300532void usbnet_pause_rx(struct usbnet *dev)
533{
534 set_bit(EVENT_RX_PAUSED, &dev->flags);
535
Joe Perchesa475f602010-02-17 10:30:24 +0000536 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
Jussi Kivilinna7834ddb2009-08-11 22:57:16 +0300537}
538EXPORT_SYMBOL_GPL(usbnet_pause_rx);
539
540void usbnet_resume_rx(struct usbnet *dev)
541{
542 struct sk_buff *skb;
543 int num = 0;
544
545 clear_bit(EVENT_RX_PAUSED, &dev->flags);
546
547 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
548 usbnet_skb_return(dev, skb);
549 num++;
550 }
551
552 tasklet_schedule(&dev->bh);
553
Joe Perchesa475f602010-02-17 10:30:24 +0000554 netif_dbg(dev, rx_status, dev->net,
555 "paused rx queue disabled, %d skbs requeued\n", num);
Jussi Kivilinna7834ddb2009-08-11 22:57:16 +0300556}
557EXPORT_SYMBOL_GPL(usbnet_resume_rx);
558
559void usbnet_purge_paused_rxq(struct usbnet *dev)
560{
561 skb_queue_purge(&dev->rxq_pause);
562}
563EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
564
565/*-------------------------------------------------------------------------*/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566
567// unlink pending rx/tx; completion handlers do all other cleanup
568
569static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
570{
571 unsigned long flags;
572 struct sk_buff *skb, *skbnext;
573 int count = 0;
574
575 spin_lock_irqsave (&q->lock, flags);
David S. Miller83bfba52008-09-22 20:18:47 -0700576 skb_queue_walk_safe(q, skb, skbnext) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 struct skb_data *entry;
578 struct urb *urb;
579 int retval;
580
581 entry = (struct skb_data *) skb->cb;
582 urb = entry->urb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583
584 // during some PM-driven resume scenarios,
585 // these (async) unlinks complete immediately
586 retval = usb_unlink_urb (urb);
587 if (retval != -EINPROGRESS && retval != 0)
Joe Perches60b86752010-02-17 10:30:23 +0000588 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 else
590 count++;
591 }
592 spin_unlock_irqrestore (&q->lock, flags);
593 return count;
594}
595
Jamie Paintera99c1942006-07-27 14:17:28 -0400596// Flush all pending rx urbs
597// minidrivers may need to do this when the MTU changes
598
599void usbnet_unlink_rx_urbs(struct usbnet *dev)
600{
601 if (netif_running(dev->net)) {
602 (void) unlink_urbs (dev, &dev->rxq);
603 tasklet_schedule(&dev->bh);
604 }
605}
606EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607
608/*-------------------------------------------------------------------------*/
609
610// precondition: never called in_interrupt
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800611static void usbnet_terminate_urbs(struct usbnet *dev)
612{
613 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup);
614 DECLARE_WAITQUEUE(wait, current);
615 int temp;
616
617 /* ensure there are no more active urbs */
618 add_wait_queue(&unlink_wakeup, &wait);
619 set_current_state(TASK_UNINTERRUPTIBLE);
620 dev->wait = &unlink_wakeup;
621 temp = unlink_urbs(dev, &dev->txq) +
622 unlink_urbs(dev, &dev->rxq);
623
624 /* maybe wait for deletions to finish. */
625 while (!skb_queue_empty(&dev->rxq)
626 && !skb_queue_empty(&dev->txq)
627 && !skb_queue_empty(&dev->done)) {
Kulikov Vasiliy66cc42a42010-07-25 22:25:42 +0000628 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800629 set_current_state(TASK_UNINTERRUPTIBLE);
Joe Perchesa475f602010-02-17 10:30:24 +0000630 netif_dbg(dev, ifdown, dev->net,
631 "waited for %d urb completions\n", temp);
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800632 }
633 set_current_state(TASK_RUNNING);
634 dev->wait = NULL;
635 remove_wait_queue(&unlink_wakeup, &wait);
636}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637
Stephen Hemminger777baa42009-03-20 19:35:54 +0000638int usbnet_stop (struct net_device *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639{
640 struct usbnet *dev = netdev_priv(net);
Jussi Kivilinnaa33e9e72009-06-16 17:17:27 +0300641 struct driver_info *info = dev->driver_info;
Jussi Kivilinnaa33e9e72009-06-16 17:17:27 +0300642 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643
644 netif_stop_queue (net);
645
Joe Perchesa475f602010-02-17 10:30:24 +0000646 netif_info(dev, ifdown, dev->net,
Ben Hutchings8ccef432010-06-08 08:20:59 +0000647 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
Joe Perchesa475f602010-02-17 10:30:24 +0000648 net->stats.rx_packets, net->stats.tx_packets,
649 net->stats.rx_errors, net->stats.tx_errors);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650
Jussi Kivilinnaa33e9e72009-06-16 17:17:27 +0300651 /* allow minidriver to stop correctly (wireless devices to turn off
652 * radio etc) */
653 if (info->stop) {
654 retval = info->stop(dev);
Joe Perchesa475f602010-02-17 10:30:24 +0000655 if (retval < 0)
656 netif_info(dev, ifdown, dev->net,
657 "stop fail (%d) usbnet usb-%s-%s, %s\n",
658 retval,
659 dev->udev->bus->bus_name, dev->udev->devpath,
660 info->description);
Jussi Kivilinnaa33e9e72009-06-16 17:17:27 +0300661 }
662
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800663 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
664 usbnet_terminate_urbs(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665
666 usb_kill_urb(dev->interrupt);
667
Jussi Kivilinna7834ddb2009-08-11 22:57:16 +0300668 usbnet_purge_paused_rxq(dev);
669
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 /* deferred work (task, timer, softirq) must also stop.
671 * can't flush_scheduled_work() until we drop rtnl (later),
672 * else workers could deadlock; so make workers a NOP.
673 */
674 dev->flags = 0;
675 del_timer_sync (&dev->delay);
676 tasklet_kill (&dev->bh);
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800677 if (info->manage_power)
678 info->manage_power(dev, 0);
679 else
680 usb_autopm_put_interface(dev->intf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681
682 return 0;
683}
Stephen Hemminger777baa42009-03-20 19:35:54 +0000684EXPORT_SYMBOL_GPL(usbnet_stop);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685
686/*-------------------------------------------------------------------------*/
687
688// posts reads, and enables write queuing
689
690// precondition: never called in_interrupt
691
Stephen Hemminger777baa42009-03-20 19:35:54 +0000692int usbnet_open (struct net_device *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693{
694 struct usbnet *dev = netdev_priv(net);
Oliver Neukuma11a6542007-08-03 13:52:19 +0200695 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 struct driver_info *info = dev->driver_info;
697
Oliver Neukuma11a6542007-08-03 13:52:19 +0200698 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
Joe Perchesa475f602010-02-17 10:30:24 +0000699 netif_info(dev, ifup, dev->net,
700 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
701 retval,
702 dev->udev->bus->bus_name,
703 dev->udev->devpath,
704 info->description);
Oliver Neukuma11a6542007-08-03 13:52:19 +0200705 goto done_nopm;
706 }
707
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 // put into "known safe" state
709 if (info->reset && (retval = info->reset (dev)) < 0) {
Joe Perchesa475f602010-02-17 10:30:24 +0000710 netif_info(dev, ifup, dev->net,
711 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
712 retval,
713 dev->udev->bus->bus_name,
714 dev->udev->devpath,
715 info->description);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 goto done;
717 }
718
719 // insist peer be connected
720 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
Joe Perchesa475f602010-02-17 10:30:24 +0000721 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 goto done;
723 }
724
725 /* start any status interrupt transfer */
726 if (dev->interrupt) {
727 retval = usb_submit_urb (dev->interrupt, GFP_KERNEL);
728 if (retval < 0) {
Joe Perchesa475f602010-02-17 10:30:24 +0000729 netif_err(dev, ifup, dev->net,
730 "intr submit %d\n", retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 goto done;
732 }
733 }
734
735 netif_start_queue (net);
Joe Perchesa475f602010-02-17 10:30:24 +0000736 netif_info(dev, ifup, dev->net,
737 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
738 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
739 dev->net->mtu,
740 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
741 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
742 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
743 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
744 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
745 "simple");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746
747 // delay posting reads until we're fully open
748 tasklet_schedule (&dev->bh);
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800749 if (info->manage_power) {
750 retval = info->manage_power(dev, 1);
751 if (retval < 0)
752 goto done;
753 usb_autopm_put_interface(dev->intf);
754 }
Oliver Neukuma11a6542007-08-03 13:52:19 +0200755 return retval;
Joe Perchesa475f602010-02-17 10:30:24 +0000756
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757done:
Oliver Neukuma11a6542007-08-03 13:52:19 +0200758 usb_autopm_put_interface(dev->intf);
759done_nopm:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 return retval;
761}
Stephen Hemminger777baa42009-03-20 19:35:54 +0000762EXPORT_SYMBOL_GPL(usbnet_open);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763
764/*-------------------------------------------------------------------------*/
765
David Brownell2e55cc72005-08-31 09:53:10 -0700766/* ethtool methods; minidrivers may need to add some more, but
767 * they'll probably want to use this base set.
768 */
769
Arnd Bergmannc41286f2006-10-09 00:08:01 +0200770int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
771{
772 struct usbnet *dev = netdev_priv(net);
773
774 if (!dev->mii.mdio_read)
775 return -EOPNOTSUPP;
776
777 return mii_ethtool_gset(&dev->mii, cmd);
778}
779EXPORT_SYMBOL_GPL(usbnet_get_settings);
780
781int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
782{
783 struct usbnet *dev = netdev_priv(net);
784 int retval;
785
786 if (!dev->mii.mdio_write)
787 return -EOPNOTSUPP;
788
789 retval = mii_ethtool_sset(&dev->mii, cmd);
790
791 /* link speed/duplex might have changed */
792 if (dev->driver_info->link_reset)
793 dev->driver_info->link_reset(dev);
794
795 return retval;
796
797}
798EXPORT_SYMBOL_GPL(usbnet_set_settings);
799
Arnd Bergmannc41286f2006-10-09 00:08:01 +0200800u32 usbnet_get_link (struct net_device *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801{
802 struct usbnet *dev = netdev_priv(net);
803
David Brownellf29fc252005-08-31 09:52:31 -0700804 /* If a check_connect is defined, return its result */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 if (dev->driver_info->check_connect)
806 return dev->driver_info->check_connect (dev) == 0;
807
Arnd Bergmannc41286f2006-10-09 00:08:01 +0200808 /* if the device has mii operations, use those */
809 if (dev->mii.mdio_read)
810 return mii_link_ok(&dev->mii);
811
Bjørn Mork05ffb3e2009-03-01 20:45:40 -0800812 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
813 return ethtool_op_get_link(net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814}
Arnd Bergmannc41286f2006-10-09 00:08:01 +0200815EXPORT_SYMBOL_GPL(usbnet_get_link);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816
David Brownell18ee91fa2006-11-02 12:29:12 -0800817int usbnet_nway_reset(struct net_device *net)
818{
819 struct usbnet *dev = netdev_priv(net);
820
821 if (!dev->mii.mdio_write)
822 return -EOPNOTSUPP;
823
824 return mii_nway_restart(&dev->mii);
825}
826EXPORT_SYMBOL_GPL(usbnet_nway_reset);
827
David Brownell18ee91fa2006-11-02 12:29:12 -0800828void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
829{
830 struct usbnet *dev = netdev_priv(net);
831
David Brownell296c0242007-04-17 16:10:10 -0700832 strncpy (info->driver, dev->driver_name, sizeof info->driver);
David Brownell18ee91fa2006-11-02 12:29:12 -0800833 strncpy (info->version, DRIVER_VERSION, sizeof info->version);
834 strncpy (info->fw_version, dev->driver_info->description,
835 sizeof info->fw_version);
836 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
837}
838EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
839
David Brownell2e55cc72005-08-31 09:53:10 -0700840u32 usbnet_get_msglevel (struct net_device *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841{
842 struct usbnet *dev = netdev_priv(net);
843
844 return dev->msg_enable;
845}
David Brownell2e55cc72005-08-31 09:53:10 -0700846EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847
David Brownell2e55cc72005-08-31 09:53:10 -0700848void usbnet_set_msglevel (struct net_device *net, u32 level)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849{
850 struct usbnet *dev = netdev_priv(net);
851
852 dev->msg_enable = level;
853}
David Brownell2e55cc72005-08-31 09:53:10 -0700854EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855
David Brownell2e55cc72005-08-31 09:53:10 -0700856/* drivers may override default ethtool_ops in their bind() routine */
Stephen Hemminger0fc0b732009-09-02 01:03:33 -0700857static const struct ethtool_ops usbnet_ethtool_ops = {
Arnd Bergmannc41286f2006-10-09 00:08:01 +0200858 .get_settings = usbnet_get_settings,
859 .set_settings = usbnet_set_settings,
David Brownell2e55cc72005-08-31 09:53:10 -0700860 .get_link = usbnet_get_link,
Arnd Bergmannc41286f2006-10-09 00:08:01 +0200861 .nway_reset = usbnet_nway_reset,
David Brownell18ee91fa2006-11-02 12:29:12 -0800862 .get_drvinfo = usbnet_get_drvinfo,
David Brownell2e55cc72005-08-31 09:53:10 -0700863 .get_msglevel = usbnet_get_msglevel,
864 .set_msglevel = usbnet_set_msglevel,
865};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866
867/*-------------------------------------------------------------------------*/
868
869/* work that cannot be done in interrupt context uses keventd.
870 *
871 * NOTE: with 2.5 we could do more of this using completion callbacks,
872 * especially now that control transfers can be queued.
873 */
874static void
David Howellsc4028952006-11-22 14:57:56 +0000875kevent (struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876{
David Howellsc4028952006-11-22 14:57:56 +0000877 struct usbnet *dev =
878 container_of(work, struct usbnet, kevent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879 int status;
880
881 /* usb_clear_halt() needs a thread context */
882 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
883 unlink_urbs (dev, &dev->txq);
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800884 status = usb_autopm_get_interface(dev->intf);
885 if (status < 0)
886 goto fail_pipe;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 status = usb_clear_halt (dev->udev, dev->out);
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800888 usb_autopm_put_interface(dev->intf);
Joe Perches8e95a202009-12-03 07:58:21 +0000889 if (status < 0 &&
890 status != -EPIPE &&
891 status != -ESHUTDOWN) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 if (netif_msg_tx_err (dev))
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800893fail_pipe:
Joe Perches60b86752010-02-17 10:30:23 +0000894 netdev_err(dev->net, "can't clear tx halt, status %d\n",
895 status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 } else {
897 clear_bit (EVENT_TX_HALT, &dev->flags);
David Brownellf29fc252005-08-31 09:52:31 -0700898 if (status != -ESHUTDOWN)
899 netif_wake_queue (dev->net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 }
901 }
902 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
903 unlink_urbs (dev, &dev->rxq);
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800904 status = usb_autopm_get_interface(dev->intf);
905 if (status < 0)
906 goto fail_halt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 status = usb_clear_halt (dev->udev, dev->in);
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800908 usb_autopm_put_interface(dev->intf);
Joe Perches8e95a202009-12-03 07:58:21 +0000909 if (status < 0 &&
910 status != -EPIPE &&
911 status != -ESHUTDOWN) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 if (netif_msg_rx_err (dev))
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800913fail_halt:
Joe Perches60b86752010-02-17 10:30:23 +0000914 netdev_err(dev->net, "can't clear rx halt, status %d\n",
915 status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 } else {
917 clear_bit (EVENT_RX_HALT, &dev->flags);
918 tasklet_schedule (&dev->bh);
919 }
920 }
921
922 /* tasklet could resubmit itself forever if memory is tight */
923 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
924 struct urb *urb = NULL;
David S. Millerdacb3972010-08-10 02:50:55 -0700925 int resched = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926
927 if (netif_running (dev->net))
928 urb = usb_alloc_urb (0, GFP_KERNEL);
929 else
930 clear_bit (EVENT_RX_MEMORY, &dev->flags);
931 if (urb != NULL) {
932 clear_bit (EVENT_RX_MEMORY, &dev->flags);
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800933 status = usb_autopm_get_interface(dev->intf);
934 if (status < 0)
935 goto fail_lowmem;
David S. Millerdacb3972010-08-10 02:50:55 -0700936 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
937 resched = 0;
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800938 usb_autopm_put_interface(dev->intf);
939fail_lowmem:
David S. Millerdacb3972010-08-10 02:50:55 -0700940 if (resched)
941 tasklet_schedule (&dev->bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942 }
943 }
944
David Hollis7ea13c92005-04-22 15:07:02 -0700945 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
David Brownellcb1cebb2007-02-15 18:52:30 -0800946 struct driver_info *info = dev->driver_info;
David Hollis7ea13c92005-04-22 15:07:02 -0700947 int retval = 0;
948
949 clear_bit (EVENT_LINK_RESET, &dev->flags);
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800950 status = usb_autopm_get_interface(dev->intf);
951 if (status < 0)
952 goto skip_reset;
David Hollis7ea13c92005-04-22 15:07:02 -0700953 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800954 usb_autopm_put_interface(dev->intf);
955skip_reset:
Joe Perches60b86752010-02-17 10:30:23 +0000956 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
957 retval,
958 dev->udev->bus->bus_name,
959 dev->udev->devpath,
960 info->description);
Oliver Neukum69ee472f2009-12-03 15:31:18 -0800961 } else {
962 usb_autopm_put_interface(dev->intf);
David Hollis7ea13c92005-04-22 15:07:02 -0700963 }
964 }
965
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966 if (dev->flags)
Joe Perches60b86752010-02-17 10:30:23 +0000967 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968}
969
970/*-------------------------------------------------------------------------*/
971
David Howells7d12e782006-10-05 14:55:46 +0100972static void tx_complete (struct urb *urb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973{
974 struct sk_buff *skb = (struct sk_buff *) urb->context;
975 struct skb_data *entry = (struct skb_data *) skb->cb;
976 struct usbnet *dev = entry->dev;
977
978 if (urb->status == 0) {
Alexey Orishko073285f2010-11-29 23:23:27 +0000979 if (!(dev->driver_info->flags & FLAG_MULTI_PACKET))
980 dev->net->stats.tx_packets++;
Herbert Xu79638372009-06-29 16:53:28 +0000981 dev->net->stats.tx_bytes += entry->length;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982 } else {
Herbert Xu79638372009-06-29 16:53:28 +0000983 dev->net->stats.tx_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984
985 switch (urb->status) {
986 case -EPIPE:
David Brownell2e55cc72005-08-31 09:53:10 -0700987 usbnet_defer_kevent (dev, EVENT_TX_HALT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 break;
989
990 /* software-driven interface shutdown */
991 case -ECONNRESET: // async unlink
992 case -ESHUTDOWN: // hardware gone
993 break;
994
995 // like rx, tx gets controller i/o faults during khubd delays
996 // and so it uses the same throttling mechanism.
Pete Zaitcev38e2bfc2006-09-18 22:49:02 -0700997 case -EPROTO:
998 case -ETIME:
999 case -EILSEQ:
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001000 usb_mark_last_busy(dev->udev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001 if (!timer_pending (&dev->delay)) {
1002 mod_timer (&dev->delay,
1003 jiffies + THROTTLE_JIFFIES);
Joe Perchesa475f602010-02-17 10:30:24 +00001004 netif_dbg(dev, link, dev->net,
1005 "tx throttle %d\n", urb->status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006 }
1007 netif_stop_queue (dev->net);
1008 break;
1009 default:
Joe Perchesa475f602010-02-17 10:30:24 +00001010 netif_dbg(dev, tx_err, dev->net,
1011 "tx err %d\n", entry->urb->status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 break;
1013 }
1014 }
1015
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001016 usb_autopm_put_interface_async(dev->intf);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 urb->dev = NULL;
1018 entry->state = tx_done;
David S. Miller8728b832005-08-09 19:25:21 -07001019 defer_bh(dev, skb, &dev->txq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020}
1021
1022/*-------------------------------------------------------------------------*/
1023
Stephen Hemminger777baa42009-03-20 19:35:54 +00001024void usbnet_tx_timeout (struct net_device *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025{
1026 struct usbnet *dev = netdev_priv(net);
1027
1028 unlink_urbs (dev, &dev->txq);
1029 tasklet_schedule (&dev->bh);
1030
1031 // FIXME: device recovery -- reset?
1032}
Stephen Hemminger777baa42009-03-20 19:35:54 +00001033EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034
1035/*-------------------------------------------------------------------------*/
1036
Stephen Hemminger25a79c42009-08-31 19:50:45 +00001037netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1038 struct net_device *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039{
1040 struct usbnet *dev = netdev_priv(net);
1041 int length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 struct urb *urb = NULL;
1043 struct skb_data *entry;
1044 struct driver_info *info = dev->driver_info;
1045 unsigned long flags;
Stephen Hemminger25a79c42009-08-31 19:50:45 +00001046 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047
1048 // some devices want funky USB-level framing, for
1049 // win32 driver (usually) and/or hardware quirks
1050 if (info->tx_fixup) {
1051 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1052 if (!skb) {
Alexey Orishko073285f2010-11-29 23:23:27 +00001053 if (netif_msg_tx_err(dev)) {
1054 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1055 goto drop;
1056 } else {
1057 /* cdc_ncm collected packet; waits for more */
1058 goto not_drop;
1059 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060 }
1061 }
1062 length = skb->len;
1063
1064 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
Joe Perchesa475f602010-02-17 10:30:24 +00001065 netif_dbg(dev, tx_err, dev->net, "no urb\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 goto drop;
1067 }
1068
1069 entry = (struct skb_data *) skb->cb;
1070 entry->urb = urb;
1071 entry->dev = dev;
1072 entry->state = tx_start;
1073 entry->length = length;
1074
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1076 skb->data, skb->len, tx_complete, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077
1078 /* don't assume the hardware handles USB_ZERO_PACKET
1079 * NOTE: strictly conforming cdc-ether devices should expect
1080 * the ZLP here, but ignore the one-byte packet.
Alexey Orishko073285f2010-11-29 23:23:27 +00001081 * NOTE2: CDC NCM specification is different from CDC ECM when
1082 * handling ZLP/short packets, so cdc_ncm driver will make short
1083 * packet itself if needed.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084 */
Elina Pashevab4d562e32010-04-06 14:23:07 +00001085 if (length % dev->maxpacket == 0) {
1086 if (!(info->flags & FLAG_SEND_ZLP)) {
Alexey Orishko073285f2010-11-29 23:23:27 +00001087 if (!(info->flags & FLAG_MULTI_PACKET)) {
1088 urb->transfer_buffer_length++;
1089 if (skb_tailroom(skb)) {
1090 skb->data[skb->len] = 0;
1091 __skb_put(skb, 1);
1092 }
Elina Pashevab4d562e32010-04-06 14:23:07 +00001093 }
1094 } else
1095 urb->transfer_flags |= URB_ZERO_PACKET;
Peter Korsgaard3e323f32007-06-27 08:48:15 +02001096 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001098 spin_lock_irqsave(&dev->txq.lock, flags);
1099 retval = usb_autopm_get_interface_async(dev->intf);
1100 if (retval < 0) {
1101 spin_unlock_irqrestore(&dev->txq.lock, flags);
1102 goto drop;
1103 }
1104
1105#ifdef CONFIG_PM
1106 /* if this triggers the device is still a sleep */
1107 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1108 /* transmission will be done in resume */
1109 usb_anchor_urb(urb, &dev->deferred);
1110 /* no use to process more packets */
1111 netif_stop_queue(net);
1112 spin_unlock_irqrestore(&dev->txq.lock, flags);
Joe Perches60b86752010-02-17 10:30:23 +00001113 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001114 goto deferred;
1115 }
1116#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117
Linus Torvalds1da177e2005-04-16 15:20:36 -07001118 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1119 case -EPIPE:
1120 netif_stop_queue (net);
David Brownell2e55cc72005-08-31 09:53:10 -07001121 usbnet_defer_kevent (dev, EVENT_TX_HALT);
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001122 usb_autopm_put_interface_async(dev->intf);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123 break;
1124 default:
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001125 usb_autopm_put_interface_async(dev->intf);
Joe Perchesa475f602010-02-17 10:30:24 +00001126 netif_dbg(dev, tx_err, dev->net,
1127 "tx: submit urb err %d\n", retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 break;
1129 case 0:
1130 net->trans_start = jiffies;
1131 __skb_queue_tail (&dev->txq, skb);
1132 if (dev->txq.qlen >= TX_QLEN (dev))
1133 netif_stop_queue (net);
1134 }
1135 spin_unlock_irqrestore (&dev->txq.lock, flags);
1136
1137 if (retval) {
Joe Perchesa475f602010-02-17 10:30:24 +00001138 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139drop:
Herbert Xu79638372009-06-29 16:53:28 +00001140 dev->net->stats.tx_dropped++;
Alexey Orishko073285f2010-11-29 23:23:27 +00001141not_drop:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142 if (skb)
1143 dev_kfree_skb_any (skb);
1144 usb_free_urb (urb);
Joe Perchesa475f602010-02-17 10:30:24 +00001145 } else
1146 netif_dbg(dev, tx_queued, dev->net,
1147 "> tx, len %d, type 0x%x\n", length, skb->protocol);
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001148#ifdef CONFIG_PM
1149deferred:
1150#endif
Stephen Hemminger25a79c42009-08-31 19:50:45 +00001151 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152}
Stephen Hemminger777baa42009-03-20 19:35:54 +00001153EXPORT_SYMBOL_GPL(usbnet_start_xmit);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154
1155/*-------------------------------------------------------------------------*/
1156
1157// tasklet (work deferred from completions, in_irq) or timer
1158
1159static void usbnet_bh (unsigned long param)
1160{
1161 struct usbnet *dev = (struct usbnet *) param;
1162 struct sk_buff *skb;
1163 struct skb_data *entry;
1164
1165 while ((skb = skb_dequeue (&dev->done))) {
1166 entry = (struct skb_data *) skb->cb;
1167 switch (entry->state) {
David Brownell18ab4582007-05-25 12:31:32 -07001168 case rx_done:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169 entry->state = rx_cleanup;
1170 rx_process (dev, skb);
1171 continue;
David Brownell18ab4582007-05-25 12:31:32 -07001172 case tx_done:
1173 case rx_cleanup:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174 usb_free_urb (entry->urb);
1175 dev_kfree_skb (skb);
1176 continue;
David Brownell18ab4582007-05-25 12:31:32 -07001177 default:
Joe Perches60b86752010-02-17 10:30:23 +00001178 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 }
1180 }
1181
1182 // waiting for all pending urbs to complete?
1183 if (dev->wait) {
1184 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) {
1185 wake_up (dev->wait);
1186 }
1187
1188 // or are we maybe short a few urbs?
Joe Perches8e95a202009-12-03 07:58:21 +00001189 } else if (netif_running (dev->net) &&
1190 netif_device_present (dev->net) &&
1191 !timer_pending (&dev->delay) &&
1192 !test_bit (EVENT_RX_HALT, &dev->flags)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193 int temp = dev->rxq.qlen;
1194 int qlen = RX_QLEN (dev);
1195
1196 if (temp < qlen) {
1197 struct urb *urb;
1198 int i;
1199
1200 // don't refill the queue all at once
1201 for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) {
1202 urb = usb_alloc_urb (0, GFP_ATOMIC);
David S. Millerdacb3972010-08-10 02:50:55 -07001203 if (urb != NULL) {
1204 if (rx_submit (dev, urb, GFP_ATOMIC) ==
1205 -ENOLINK)
1206 return;
1207 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208 }
Joe Perchesa475f602010-02-17 10:30:24 +00001209 if (temp != dev->rxq.qlen)
1210 netif_dbg(dev, link, dev->net,
1211 "rxqlen %d --> %d\n",
1212 temp, dev->rxq.qlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213 if (dev->rxq.qlen < qlen)
1214 tasklet_schedule (&dev->bh);
1215 }
1216 if (dev->txq.qlen < TX_QLEN (dev))
1217 netif_wake_queue (dev->net);
1218 }
1219}
1220
1221
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222/*-------------------------------------------------------------------------
1223 *
1224 * USB Device Driver support
1225 *
1226 *-------------------------------------------------------------------------*/
David Brownellcb1cebb2007-02-15 18:52:30 -08001227
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228// precondition: never called in_interrupt
1229
David Brownell38bde1d2005-08-31 09:52:45 -07001230void usbnet_disconnect (struct usb_interface *intf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231{
1232 struct usbnet *dev;
1233 struct usb_device *xdev;
1234 struct net_device *net;
1235
1236 dev = usb_get_intfdata(intf);
1237 usb_set_intfdata(intf, NULL);
1238 if (!dev)
1239 return;
1240
1241 xdev = interface_to_usbdev (intf);
1242
Joe Perchesa475f602010-02-17 10:30:24 +00001243 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1244 intf->dev.driver->name,
1245 xdev->bus->bus_name, xdev->devpath,
1246 dev->driver_info->description);
David Brownellcb1cebb2007-02-15 18:52:30 -08001247
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248 net = dev->net;
1249 unregister_netdev (net);
1250
Tejun Heo23f333a2010-12-12 16:45:14 +01001251 cancel_work_sync(&dev->kevent);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252
1253 if (dev->driver_info->unbind)
1254 dev->driver_info->unbind (dev, intf);
1255
1256 free_netdev(net);
1257 usb_put_dev (xdev);
1258}
David Brownell38bde1d2005-08-31 09:52:45 -07001259EXPORT_SYMBOL_GPL(usbnet_disconnect);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260
Stephen Hemminger777baa42009-03-20 19:35:54 +00001261static const struct net_device_ops usbnet_netdev_ops = {
1262 .ndo_open = usbnet_open,
1263 .ndo_stop = usbnet_stop,
1264 .ndo_start_xmit = usbnet_start_xmit,
1265 .ndo_tx_timeout = usbnet_tx_timeout,
1266 .ndo_change_mtu = usbnet_change_mtu,
1267 .ndo_set_mac_address = eth_mac_addr,
1268 .ndo_validate_addr = eth_validate_addr,
1269};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270
1271/*-------------------------------------------------------------------------*/
1272
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273// precondition: never called in_interrupt
1274
Marcel Holtmann225794f2009-10-02 05:15:26 +00001275static struct device_type wlan_type = {
1276 .name = "wlan",
1277};
1278
1279static struct device_type wwan_type = {
1280 .name = "wwan",
1281};
1282
David Brownell38bde1d2005-08-31 09:52:45 -07001283int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1285{
1286 struct usbnet *dev;
David Brownellcb1cebb2007-02-15 18:52:30 -08001287 struct net_device *net;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288 struct usb_host_interface *interface;
1289 struct driver_info *info;
1290 struct usb_device *xdev;
1291 int status;
David Brownell296c0242007-04-17 16:10:10 -07001292 const char *name;
Ming Leib0786b42010-11-01 07:11:54 -07001293 struct usb_driver *driver = to_usb_driver(udev->dev.driver);
1294
1295 /* usbnet already took usb runtime pm, so have to enable the feature
1296 * for usb interface, otherwise usb_autopm_get_interface may return
1297 * failure if USB_SUSPEND(RUNTIME_PM) is enabled.
1298 */
1299 if (!driver->supports_autosuspend) {
1300 driver->supports_autosuspend = 1;
1301 pm_runtime_enable(&udev->dev);
1302 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303
David Brownell296c0242007-04-17 16:10:10 -07001304 name = udev->dev.driver->name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305 info = (struct driver_info *) prod->driver_info;
1306 if (!info) {
David Brownell296c0242007-04-17 16:10:10 -07001307 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308 return -ENODEV;
1309 }
1310 xdev = interface_to_usbdev (udev);
1311 interface = udev->cur_altsetting;
1312
1313 usb_get_dev (xdev);
1314
1315 status = -ENOMEM;
1316
1317 // set up our own records
1318 net = alloc_etherdev(sizeof(*dev));
1319 if (!net) {
1320 dbg ("can't kmalloc dev");
1321 goto out;
1322 }
1323
Ben Hutchings0dacca72010-07-02 21:49:02 -07001324 /* netdev_printk() needs this so do it as early as possible */
1325 SET_NETDEV_DEV(net, &udev->dev);
1326
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327 dev = netdev_priv(net);
1328 dev->udev = xdev;
Oliver Neukuma11a6542007-08-03 13:52:19 +02001329 dev->intf = udev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330 dev->driver_info = info;
David Brownell296c0242007-04-17 16:10:10 -07001331 dev->driver_name = name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1333 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1334 skb_queue_head_init (&dev->rxq);
1335 skb_queue_head_init (&dev->txq);
1336 skb_queue_head_init (&dev->done);
Jussi Kivilinna7834ddb2009-08-11 22:57:16 +03001337 skb_queue_head_init(&dev->rxq_pause);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338 dev->bh.func = usbnet_bh;
1339 dev->bh.data = (unsigned long) dev;
David Howellsc4028952006-11-22 14:57:56 +00001340 INIT_WORK (&dev->kevent, kevent);
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001341 init_usb_anchor(&dev->deferred);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342 dev->delay.function = usbnet_bh;
1343 dev->delay.data = (unsigned long) dev;
1344 init_timer (&dev->delay);
Arnd Bergmanna9fc6332006-10-09 00:08:02 +02001345 mutex_init (&dev->phy_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347 dev->net = net;
1348 strcpy (net->name, "usb%d");
1349 memcpy (net->dev_addr, node_id, sizeof node_id);
1350
David Brownell2e55cc72005-08-31 09:53:10 -07001351 /* rx and tx sides can use different message sizes;
1352 * bind() should set rx_urb_size in that case.
1353 */
1354 dev->hard_mtu = net->mtu + net->hard_header_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355#if 0
1356// dma_supported() is deeply broken on almost all architectures
1357 // possible with some EHCI controllers
Yang Hongyang6a355282009-04-06 19:01:13 -07001358 if (dma_supported (&udev->dev, DMA_BIT_MASK(64)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359 net->features |= NETIF_F_HIGHDMA;
1360#endif
1361
Stephen Hemminger777baa42009-03-20 19:35:54 +00001362 net->netdev_ops = &usbnet_netdev_ops;
Stephen Hemminger777baa42009-03-20 19:35:54 +00001363 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364 net->ethtool_ops = &usbnet_ethtool_ops;
1365
1366 // allow device-specific bind/init procedures
1367 // NOTE net->name still not usable ...
1368 if (info->bind) {
1369 status = info->bind (dev, udev);
David Brownellcb1cebb2007-02-15 18:52:30 -08001370 if (status < 0)
1371 goto out1;
1372
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373 // heuristic: "usb%d" for links we know are two-host,
1374 // else "eth%d" when there's reasonable doubt. userspace
1375 // can rename the link if it knows better.
Joe Perches8e95a202009-12-03 07:58:21 +00001376 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
1377 (net->dev_addr [0] & 0x02) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378 strcpy (net->name, "eth%d");
Jussi Kivilinna6e3bbcc2008-01-26 00:51:06 +02001379 /* WLAN devices should always be named "wlan%d" */
1380 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1381 strcpy(net->name, "wlan%d");
Marcel Holtmanne1e499e2009-10-02 05:15:25 +00001382 /* WWAN devices should always be named "wwan%d" */
1383 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1384 strcpy(net->name, "wwan%d");
David Brownellf29fc252005-08-31 09:52:31 -07001385
1386 /* maybe the remote can't receive an Ethernet MTU */
1387 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1388 net->mtu = dev->hard_mtu - net->hard_header_len;
David Brownell2e55cc72005-08-31 09:53:10 -07001389 } else if (!info->in || !info->out)
1390 status = usbnet_get_endpoints (dev, udev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391 else {
1392 dev->in = usb_rcvbulkpipe (xdev, info->in);
1393 dev->out = usb_sndbulkpipe (xdev, info->out);
1394 if (!(info->flags & FLAG_NO_SETINT))
1395 status = usb_set_interface (xdev,
1396 interface->desc.bInterfaceNumber,
1397 interface->desc.bAlternateSetting);
1398 else
1399 status = 0;
1400
1401 }
Peter Korsgaard9514bfe2007-07-03 00:46:42 +02001402 if (status >= 0 && dev->status)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403 status = init_status (dev, udev);
1404 if (status < 0)
David Brownellcb1cebb2007-02-15 18:52:30 -08001405 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406
David Brownell2e55cc72005-08-31 09:53:10 -07001407 if (!dev->rx_urb_size)
1408 dev->rx_urb_size = dev->hard_mtu;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
David Brownellcb1cebb2007-02-15 18:52:30 -08001410
Marcel Holtmann225794f2009-10-02 05:15:26 +00001411 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1412 SET_NETDEV_DEVTYPE(net, &wlan_type);
1413 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1414 SET_NETDEV_DEVTYPE(net, &wwan_type);
1415
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416 status = register_netdev (net);
1417 if (status)
1418 goto out3;
Joe Perchesa475f602010-02-17 10:30:24 +00001419 netif_info(dev, probe, dev->net,
1420 "register '%s' at usb-%s-%s, %s, %pM\n",
1421 udev->dev.driver->name,
1422 xdev->bus->bus_name, xdev->devpath,
1423 dev->driver_info->description,
1424 net->dev_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425
1426 // ok, it's ready to go.
1427 usb_set_intfdata (udev, dev);
1428
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429 netif_device_attach (net);
1430
Ben Hutchings37e82732009-11-04 15:29:52 +00001431 if (dev->driver_info->flags & FLAG_LINK_INTR)
1432 netif_carrier_off(net);
1433
Linus Torvalds1da177e2005-04-16 15:20:36 -07001434 return 0;
1435
1436out3:
1437 if (info->unbind)
1438 info->unbind (dev, udev);
1439out1:
1440 free_netdev(net);
1441out:
1442 usb_put_dev(xdev);
1443 return status;
1444}
David Brownell38bde1d2005-08-31 09:52:45 -07001445EXPORT_SYMBOL_GPL(usbnet_probe);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001446
1447/*-------------------------------------------------------------------------*/
1448
Oliver Neukum36433122007-04-30 01:37:44 -07001449/*
1450 * suspend the whole driver as soon as the first interface is suspended
1451 * resume only when the last interface is resumed
David Brownell38bde1d2005-08-31 09:52:45 -07001452 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453
David Brownell38bde1d2005-08-31 09:52:45 -07001454int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455{
1456 struct usbnet *dev = usb_get_intfdata(intf);
David Brownellcb1cebb2007-02-15 18:52:30 -08001457
Oliver Neukum36433122007-04-30 01:37:44 -07001458 if (!dev->suspend_count++) {
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001459 spin_lock_irq(&dev->txq.lock);
1460 /* don't autosuspend while transmitting */
1461 if (dev->txq.qlen && (message.event & PM_EVENT_AUTO)) {
1462 spin_unlock_irq(&dev->txq.lock);
1463 return -EBUSY;
1464 } else {
1465 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1466 spin_unlock_irq(&dev->txq.lock);
1467 }
Oliver Neukuma11a6542007-08-03 13:52:19 +02001468 /*
1469 * accelerate emptying of the rx and queues, to avoid
Oliver Neukum36433122007-04-30 01:37:44 -07001470 * having everything error out.
1471 */
1472 netif_device_detach (dev->net);
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001473 usbnet_terminate_urbs(dev);
1474 usb_kill_urb(dev->interrupt);
1475
Oliver Neukuma11a6542007-08-03 13:52:19 +02001476 /*
1477 * reattach so runtime management can use and
1478 * wake the device
1479 */
1480 netif_device_attach (dev->net);
Oliver Neukum36433122007-04-30 01:37:44 -07001481 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001482 return 0;
1483}
David Brownell38bde1d2005-08-31 09:52:45 -07001484EXPORT_SYMBOL_GPL(usbnet_suspend);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001485
David Brownell38bde1d2005-08-31 09:52:45 -07001486int usbnet_resume (struct usb_interface *intf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487{
1488 struct usbnet *dev = usb_get_intfdata(intf);
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001489 struct sk_buff *skb;
1490 struct urb *res;
1491 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001493 if (!--dev->suspend_count) {
1494 spin_lock_irq(&dev->txq.lock);
1495 while ((res = usb_get_from_anchor(&dev->deferred))) {
1496
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001497 skb = (struct sk_buff *)res->context;
1498 retval = usb_submit_urb(res, GFP_ATOMIC);
1499 if (retval < 0) {
1500 dev_kfree_skb_any(skb);
1501 usb_free_urb(res);
1502 usb_autopm_put_interface_async(dev->intf);
1503 } else {
1504 dev->net->trans_start = jiffies;
1505 __skb_queue_tail(&dev->txq, skb);
1506 }
1507 }
1508
1509 smp_mb();
1510 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1511 spin_unlock_irq(&dev->txq.lock);
1512 if (!(dev->txq.qlen >= TX_QLEN(dev)))
1513 netif_start_queue(dev->net);
Oliver Neukum36433122007-04-30 01:37:44 -07001514 tasklet_schedule (&dev->bh);
Oliver Neukum69ee472f2009-12-03 15:31:18 -08001515 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516 return 0;
1517}
David Brownell38bde1d2005-08-31 09:52:45 -07001518EXPORT_SYMBOL_GPL(usbnet_resume);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001519
Linus Torvalds1da177e2005-04-16 15:20:36 -07001520
1521/*-------------------------------------------------------------------------*/
1522
David Brownellf29fc252005-08-31 09:52:31 -07001523static int __init usbnet_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001524{
David Brownell090ffa92005-08-31 09:54:50 -07001525 /* compiler should optimize this out */
Alexey Dobriyanf8ac2322006-10-08 16:02:00 +04001526 BUILD_BUG_ON (sizeof (((struct sk_buff *)0)->cb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527 < sizeof (struct skb_data));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001528
1529 random_ether_addr(node_id);
David Brownellcb1cebb2007-02-15 18:52:30 -08001530 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531}
David Brownellf29fc252005-08-31 09:52:31 -07001532module_init(usbnet_init);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533
David Brownellf29fc252005-08-31 09:52:31 -07001534static void __exit usbnet_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001535{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001536}
David Brownellf29fc252005-08-31 09:52:31 -07001537module_exit(usbnet_exit);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001538
David Brownellf29fc252005-08-31 09:52:31 -07001539MODULE_AUTHOR("David Brownell");
David Brownell090ffa92005-08-31 09:54:50 -07001540MODULE_DESCRIPTION("USB network driver framework");
David Brownellf29fc252005-08-31 09:52:31 -07001541MODULE_LICENSE("GPL");