1 /* 2 * USB Network driver infrastructure 3 * Copyright (C) 2000-2005 by David Brownell 4 * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 */ 20 21 /* 22 * This is a generic "USB networking" framework that works with several 23 * kinds of full and high speed networking devices: host-to-host cables, 24 * smart usb peripherals, and actual Ethernet adapters. 25 * 26 * 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 */ 32 33 // #define DEBUG // error path messages, extra info 34 // #define VERBOSE // more; success messages 35 36 #include <linux/module.h> 37 #include <linux/init.h> 38 #include <linux/netdevice.h> 39 #include <linux/etherdevice.h> 40 #include <linux/ctype.h> 41 #include <linux/ethtool.h> 42 #include <linux/workqueue.h> 43 #include <linux/mii.h> 44 #include <linux/usb.h> 45 #include <linux/usb/usbnet.h> 46 47 #define DRIVER_VERSION "22-Aug-2005" 48 49 50 /*-------------------------------------------------------------------------*/ 51 52 /* 53 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max. 54 * Several dozen bytes of IPv4 data can fit in two such transactions. 55 * One maximum size Ethernet packet takes twenty four of them. 56 * For high speed, each frame comfortably fits almost 36 max size 57 * Ethernet packets (so queues should be bigger). 58 * 59 * REVISIT qlens should be members of 'struct usbnet'; the goal is to 60 * let the USB host controller be busy for 5msec or more before an irq 61 * is required, under load. Jumbograms change the equation. 62 */ 63 #define RX_MAX_QUEUE_MEMORY (60 * 1518) 64 #define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \ 65 (RX_MAX_QUEUE_MEMORY/(dev)->rx_urb_size) : 4) 66 #define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \ 67 (RX_MAX_QUEUE_MEMORY/(dev)->hard_mtu) : 4) 68 69 // 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 76 // between wakeups 77 #define UNLINK_TIMEOUT_MS 3 78 79 /*-------------------------------------------------------------------------*/ 80 81 // randomly generated ethernet address 82 static u8 node_id [ETH_ALEN]; 83 84 static const char driver_name [] = "usbnet"; 85 86 /* use ethtool to change the level for any given device */ 87 static int msg_level = -1; 88 module_param (msg_level, int, 0); 89 MODULE_PARM_DESC (msg_level, "Override default message level"); 90 91 /*-------------------------------------------------------------------------*/ 92 93 /* handles CDC Ethernet and many other network "bulk data" interfaces */ 94 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf) 95 { 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; 109 * ignore other endpoints and altsetttings. 110 */ 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: 118 if (!usb_endpoint_dir_in(&e->desc)) 119 continue; 120 intr = 1; 121 /* FALLTHROUGH */ 122 case USB_ENDPOINT_XFER_BULK: 123 break; 124 default: 125 continue; 126 } 127 if (usb_endpoint_dir_in(&e->desc)) { 128 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; 142 143 if (alt->desc.bAlternateSetting != 0 144 || !(dev->driver_info->flags & FLAG_NO_SETINT)) { 145 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber, 146 alt->desc.bAlternateSetting); 147 if (tmp < 0) 148 return tmp; 149 } 150 151 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 } 158 EXPORT_SYMBOL_GPL(usbnet_get_endpoints); 159 160 static u8 nibble(unsigned char c) 161 { 162 if (likely(isdigit(c))) 163 return c - '0'; 164 c = toupper(c); 165 if (likely(isxdigit(c))) 166 return 10 + c - 'A'; 167 return 0; 168 } 169 170 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress) 171 { 172 int tmp, i; 173 unsigned char buf [13]; 174 175 tmp = usb_string(dev->udev, iMACAddress, buf, sizeof buf); 176 if (tmp != 12) { 177 dev_dbg(&dev->udev->dev, 178 "bad MAC string %d fetch, %d\n", iMACAddress, tmp); 179 if (tmp >= 0) 180 tmp = -EINVAL; 181 return tmp; 182 } 183 for (i = tmp = 0; i < 6; i++, tmp += 2) 184 dev->net->dev_addr [i] = 185 (nibble(buf [tmp]) << 4) + nibble(buf [tmp + 1]); 186 return 0; 187 } 188 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr); 189 190 static void intr_complete (struct urb *urb); 191 192 static int init_status (struct usbnet *dev, struct usb_interface *intf) 193 { 194 char *buf = NULL; 195 unsigned pipe = 0; 196 unsigned maxp; 197 unsigned period; 198 199 if (!dev->driver_info->status) 200 return 0; 201 202 pipe = usb_rcvintpipe (dev->udev, 203 dev->status->desc.bEndpointAddress 204 & USB_ENDPOINT_NUMBER_MASK); 205 maxp = usb_maxpacket (dev->udev, pipe, 0); 206 207 /* avoid 1 msec chatter: min 8 msec poll rate */ 208 period = max ((int) dev->status->desc.bInterval, 209 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3); 210 211 buf = kmalloc (maxp, GFP_KERNEL); 212 if (buf) { 213 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL); 214 if (!dev->interrupt) { 215 kfree (buf); 216 return -ENOMEM; 217 } else { 218 usb_fill_int_urb(dev->interrupt, dev->udev, pipe, 219 buf, maxp, intr_complete, dev, period); 220 dev_dbg(&intf->dev, 221 "status ep%din, %d bytes period %d\n", 222 usb_pipeendpoint(pipe), maxp, period); 223 } 224 } 225 return 0; 226 } 227 228 /* Passes this packet up the stack, updating its accounting. 229 * Some link protocols batch packets, so their rx_fixup paths 230 * can return clones as well as just modify the original skb. 231 */ 232 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb) 233 { 234 int status; 235 236 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) { 237 skb_queue_tail(&dev->rxq_pause, skb); 238 return; 239 } 240 241 skb->protocol = eth_type_trans (skb, dev->net); 242 dev->net->stats.rx_packets++; 243 dev->net->stats.rx_bytes += skb->len; 244 245 if (netif_msg_rx_status (dev)) 246 devdbg (dev, "< rx, len %zu, type 0x%x", 247 skb->len + sizeof (struct ethhdr), skb->protocol); 248 memset (skb->cb, 0, sizeof (struct skb_data)); 249 status = netif_rx (skb); 250 if (status != NET_RX_SUCCESS && netif_msg_rx_err (dev)) 251 devdbg (dev, "netif_rx status %d", status); 252 } 253 EXPORT_SYMBOL_GPL(usbnet_skb_return); 254 255 256 /*------------------------------------------------------------------------- 257 * 258 * Network Device Driver (peer link to "Host Device", from USB host) 259 * 260 *-------------------------------------------------------------------------*/ 261 262 int usbnet_change_mtu (struct net_device *net, int new_mtu) 263 { 264 struct usbnet *dev = netdev_priv(net); 265 int ll_mtu = new_mtu + net->hard_header_len; 266 int old_hard_mtu = dev->hard_mtu; 267 int old_rx_urb_size = dev->rx_urb_size; 268 269 if (new_mtu <= 0) 270 return -EINVAL; 271 // no second zero-length packet read wanted after mtu-sized packets 272 if ((ll_mtu % dev->maxpacket) == 0) 273 return -EDOM; 274 net->mtu = new_mtu; 275 276 dev->hard_mtu = net->mtu + net->hard_header_len; 277 if (dev->rx_urb_size == old_hard_mtu) { 278 dev->rx_urb_size = dev->hard_mtu; 279 if (dev->rx_urb_size > old_rx_urb_size) 280 usbnet_unlink_rx_urbs(dev); 281 } 282 283 return 0; 284 } 285 EXPORT_SYMBOL_GPL(usbnet_change_mtu); 286 287 /*-------------------------------------------------------------------------*/ 288 289 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from 290 * completion callbacks. 2.5 should have fixed those bugs... 291 */ 292 293 static void defer_bh(struct usbnet *dev, struct sk_buff *skb, struct sk_buff_head *list) 294 { 295 unsigned long flags; 296 297 spin_lock_irqsave(&list->lock, flags); 298 __skb_unlink(skb, list); 299 spin_unlock(&list->lock); 300 spin_lock(&dev->done.lock); 301 __skb_queue_tail(&dev->done, skb); 302 if (dev->done.qlen == 1) 303 tasklet_schedule(&dev->bh); 304 spin_unlock_irqrestore(&dev->done.lock, flags); 305 } 306 307 /* some work can't be done in tasklets, so we use keventd 308 * 309 * NOTE: annoying asymmetry: if it's active, schedule_work() fails, 310 * but tasklet_schedule() doesn't. hope the failure is rare. 311 */ 312 void usbnet_defer_kevent (struct usbnet *dev, int work) 313 { 314 set_bit (work, &dev->flags); 315 if (!schedule_work (&dev->kevent)) 316 deverr (dev, "kevent %d may have been dropped", work); 317 else 318 devdbg (dev, "kevent %d scheduled", work); 319 } 320 EXPORT_SYMBOL_GPL(usbnet_defer_kevent); 321 322 /*-------------------------------------------------------------------------*/ 323 324 static void rx_complete (struct urb *urb); 325 326 static void rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) 327 { 328 struct sk_buff *skb; 329 struct skb_data *entry; 330 int retval = 0; 331 unsigned long lockflags; 332 size_t size = dev->rx_urb_size; 333 334 if ((skb = alloc_skb (size + NET_IP_ALIGN, flags)) == NULL) { 335 if (netif_msg_rx_err (dev)) 336 devdbg (dev, "no rx skb"); 337 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 338 usb_free_urb (urb); 339 return; 340 } 341 skb_reserve (skb, NET_IP_ALIGN); 342 343 entry = (struct skb_data *) skb->cb; 344 entry->urb = urb; 345 entry->dev = dev; 346 entry->state = rx_start; 347 entry->length = 0; 348 349 usb_fill_bulk_urb (urb, dev->udev, dev->in, 350 skb->data, size, rx_complete, skb); 351 352 spin_lock_irqsave (&dev->rxq.lock, lockflags); 353 354 if (netif_running (dev->net) 355 && netif_device_present (dev->net) 356 && !test_bit (EVENT_RX_HALT, &dev->flags)) { 357 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) { 358 case -EPIPE: 359 usbnet_defer_kevent (dev, EVENT_RX_HALT); 360 break; 361 case -ENOMEM: 362 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 363 break; 364 case -ENODEV: 365 if (netif_msg_ifdown (dev)) 366 devdbg (dev, "device gone"); 367 netif_device_detach (dev->net); 368 break; 369 default: 370 if (netif_msg_rx_err (dev)) 371 devdbg (dev, "rx submit, %d", retval); 372 tasklet_schedule (&dev->bh); 373 break; 374 case 0: 375 __skb_queue_tail (&dev->rxq, skb); 376 } 377 } else { 378 if (netif_msg_ifdown (dev)) 379 devdbg (dev, "rx: stopped"); 380 retval = -ENOLINK; 381 } 382 spin_unlock_irqrestore (&dev->rxq.lock, lockflags); 383 if (retval) { 384 dev_kfree_skb_any (skb); 385 usb_free_urb (urb); 386 } 387 } 388 389 390 /*-------------------------------------------------------------------------*/ 391 392 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb) 393 { 394 if (dev->driver_info->rx_fixup 395 && !dev->driver_info->rx_fixup (dev, skb)) 396 goto error; 397 // else network stack removes extra byte if we forced a short packet 398 399 if (skb->len) 400 usbnet_skb_return (dev, skb); 401 else { 402 if (netif_msg_rx_err (dev)) 403 devdbg (dev, "drop"); 404 error: 405 dev->net->stats.rx_errors++; 406 skb_queue_tail (&dev->done, skb); 407 } 408 } 409 410 /*-------------------------------------------------------------------------*/ 411 412 static void rx_complete (struct urb *urb) 413 { 414 struct sk_buff *skb = (struct sk_buff *) urb->context; 415 struct skb_data *entry = (struct skb_data *) skb->cb; 416 struct usbnet *dev = entry->dev; 417 int urb_status = urb->status; 418 419 skb_put (skb, urb->actual_length); 420 entry->state = rx_done; 421 entry->urb = NULL; 422 423 switch (urb_status) { 424 /* success */ 425 case 0: 426 if (skb->len < dev->net->hard_header_len) { 427 entry->state = rx_cleanup; 428 dev->net->stats.rx_errors++; 429 dev->net->stats.rx_length_errors++; 430 if (netif_msg_rx_err (dev)) 431 devdbg (dev, "rx length %d", skb->len); 432 } 433 break; 434 435 /* stalls need manual reset. this is rare ... except that 436 * when going through USB 2.0 TTs, unplug appears this way. 437 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ 438 * storm, recovering as needed. 439 */ 440 case -EPIPE: 441 dev->net->stats.rx_errors++; 442 usbnet_defer_kevent (dev, EVENT_RX_HALT); 443 // FALLTHROUGH 444 445 /* software-driven interface shutdown */ 446 case -ECONNRESET: /* async unlink */ 447 case -ESHUTDOWN: /* hardware gone */ 448 if (netif_msg_ifdown (dev)) 449 devdbg (dev, "rx shutdown, code %d", urb_status); 450 goto block; 451 452 /* we get controller i/o faults during khubd disconnect() delays. 453 * throttle down resubmits, to avoid log floods; just temporarily, 454 * so we still recover when the fault isn't a khubd delay. 455 */ 456 case -EPROTO: 457 case -ETIME: 458 case -EILSEQ: 459 dev->net->stats.rx_errors++; 460 if (!timer_pending (&dev->delay)) { 461 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); 462 if (netif_msg_link (dev)) 463 devdbg (dev, "rx throttle %d", urb_status); 464 } 465 block: 466 entry->state = rx_cleanup; 467 entry->urb = urb; 468 urb = NULL; 469 break; 470 471 /* data overrun ... flush fifo? */ 472 case -EOVERFLOW: 473 dev->net->stats.rx_over_errors++; 474 // FALLTHROUGH 475 476 default: 477 entry->state = rx_cleanup; 478 dev->net->stats.rx_errors++; 479 if (netif_msg_rx_err (dev)) 480 devdbg (dev, "rx status %d", urb_status); 481 break; 482 } 483 484 defer_bh(dev, skb, &dev->rxq); 485 486 if (urb) { 487 if (netif_running (dev->net) 488 && !test_bit (EVENT_RX_HALT, &dev->flags)) { 489 rx_submit (dev, urb, GFP_ATOMIC); 490 return; 491 } 492 usb_free_urb (urb); 493 } 494 if (netif_msg_rx_err (dev)) 495 devdbg (dev, "no read resubmitted"); 496 } 497 498 static void intr_complete (struct urb *urb) 499 { 500 struct usbnet *dev = urb->context; 501 int status = urb->status; 502 503 switch (status) { 504 /* success */ 505 case 0: 506 dev->driver_info->status(dev, urb); 507 break; 508 509 /* software-driven interface shutdown */ 510 case -ENOENT: /* urb killed */ 511 case -ESHUTDOWN: /* hardware gone */ 512 if (netif_msg_ifdown (dev)) 513 devdbg (dev, "intr shutdown, code %d", status); 514 return; 515 516 /* NOTE: not throttling like RX/TX, since this endpoint 517 * already polls infrequently 518 */ 519 default: 520 devdbg (dev, "intr status %d", status); 521 break; 522 } 523 524 if (!netif_running (dev->net)) 525 return; 526 527 memset(urb->transfer_buffer, 0, urb->transfer_buffer_length); 528 status = usb_submit_urb (urb, GFP_ATOMIC); 529 if (status != 0 && netif_msg_timer (dev)) 530 deverr(dev, "intr resubmit --> %d", status); 531 } 532 533 /*-------------------------------------------------------------------------*/ 534 void usbnet_pause_rx(struct usbnet *dev) 535 { 536 set_bit(EVENT_RX_PAUSED, &dev->flags); 537 538 if (netif_msg_rx_status(dev)) 539 devdbg(dev, "paused rx queue enabled"); 540 } 541 EXPORT_SYMBOL_GPL(usbnet_pause_rx); 542 543 void usbnet_resume_rx(struct usbnet *dev) 544 { 545 struct sk_buff *skb; 546 int num = 0; 547 548 clear_bit(EVENT_RX_PAUSED, &dev->flags); 549 550 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) { 551 usbnet_skb_return(dev, skb); 552 num++; 553 } 554 555 tasklet_schedule(&dev->bh); 556 557 if (netif_msg_rx_status(dev)) 558 devdbg(dev, "paused rx queue disabled, %d skbs requeued", num); 559 } 560 EXPORT_SYMBOL_GPL(usbnet_resume_rx); 561 562 void usbnet_purge_paused_rxq(struct usbnet *dev) 563 { 564 skb_queue_purge(&dev->rxq_pause); 565 } 566 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq); 567 568 /*-------------------------------------------------------------------------*/ 569 570 // unlink pending rx/tx; completion handlers do all other cleanup 571 572 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) 573 { 574 unsigned long flags; 575 struct sk_buff *skb, *skbnext; 576 int count = 0; 577 578 spin_lock_irqsave (&q->lock, flags); 579 skb_queue_walk_safe(q, skb, skbnext) { 580 struct skb_data *entry; 581 struct urb *urb; 582 int retval; 583 584 entry = (struct skb_data *) skb->cb; 585 urb = entry->urb; 586 587 // during some PM-driven resume scenarios, 588 // these (async) unlinks complete immediately 589 retval = usb_unlink_urb (urb); 590 if (retval != -EINPROGRESS && retval != 0) 591 devdbg (dev, "unlink urb err, %d", retval); 592 else 593 count++; 594 } 595 spin_unlock_irqrestore (&q->lock, flags); 596 return count; 597 } 598 599 // Flush all pending rx urbs 600 // minidrivers may need to do this when the MTU changes 601 602 void usbnet_unlink_rx_urbs(struct usbnet *dev) 603 { 604 if (netif_running(dev->net)) { 605 (void) unlink_urbs (dev, &dev->rxq); 606 tasklet_schedule(&dev->bh); 607 } 608 } 609 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); 610 611 /*-------------------------------------------------------------------------*/ 612 613 // precondition: never called in_interrupt 614 615 int usbnet_stop (struct net_device *net) 616 { 617 struct usbnet *dev = netdev_priv(net); 618 struct driver_info *info = dev->driver_info; 619 int temp; 620 int retval; 621 DECLARE_WAIT_QUEUE_HEAD_ONSTACK (unlink_wakeup); 622 DECLARE_WAITQUEUE (wait, current); 623 624 netif_stop_queue (net); 625 626 if (netif_msg_ifdown (dev)) 627 devinfo (dev, "stop stats: rx/tx %ld/%ld, errs %ld/%ld", 628 net->stats.rx_packets, net->stats.tx_packets, 629 net->stats.rx_errors, net->stats.tx_errors 630 ); 631 632 /* allow minidriver to stop correctly (wireless devices to turn off 633 * radio etc) */ 634 if (info->stop) { 635 retval = info->stop(dev); 636 if (retval < 0 && netif_msg_ifdown(dev)) 637 devinfo(dev, 638 "stop fail (%d) usbnet usb-%s-%s, %s", 639 retval, 640 dev->udev->bus->bus_name, dev->udev->devpath, 641 info->description); 642 } 643 644 if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) { 645 /* ensure there are no more active urbs */ 646 add_wait_queue(&unlink_wakeup, &wait); 647 dev->wait = &unlink_wakeup; 648 temp = unlink_urbs(dev, &dev->txq) + 649 unlink_urbs(dev, &dev->rxq); 650 651 /* maybe wait for deletions to finish. */ 652 while (!skb_queue_empty(&dev->rxq) 653 && !skb_queue_empty(&dev->txq) 654 && !skb_queue_empty(&dev->done)) { 655 msleep(UNLINK_TIMEOUT_MS); 656 if (netif_msg_ifdown(dev)) 657 devdbg(dev, "waited for %d urb completions", 658 temp); 659 } 660 dev->wait = NULL; 661 remove_wait_queue(&unlink_wakeup, &wait); 662 } 663 664 usb_kill_urb(dev->interrupt); 665 666 usbnet_purge_paused_rxq(dev); 667 668 /* deferred work (task, timer, softirq) must also stop. 669 * can't flush_scheduled_work() until we drop rtnl (later), 670 * else workers could deadlock; so make workers a NOP. 671 */ 672 dev->flags = 0; 673 del_timer_sync (&dev->delay); 674 tasklet_kill (&dev->bh); 675 usb_autopm_put_interface(dev->intf); 676 677 return 0; 678 } 679 EXPORT_SYMBOL_GPL(usbnet_stop); 680 681 /*-------------------------------------------------------------------------*/ 682 683 // posts reads, and enables write queuing 684 685 // precondition: never called in_interrupt 686 687 int usbnet_open (struct net_device *net) 688 { 689 struct usbnet *dev = netdev_priv(net); 690 int retval; 691 struct driver_info *info = dev->driver_info; 692 693 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { 694 if (netif_msg_ifup (dev)) 695 devinfo (dev, 696 "resumption fail (%d) usbnet usb-%s-%s, %s", 697 retval, 698 dev->udev->bus->bus_name, dev->udev->devpath, 699 info->description); 700 goto done_nopm; 701 } 702 703 // put into "known safe" state 704 if (info->reset && (retval = info->reset (dev)) < 0) { 705 if (netif_msg_ifup (dev)) 706 devinfo (dev, 707 "open reset fail (%d) usbnet usb-%s-%s, %s", 708 retval, 709 dev->udev->bus->bus_name, dev->udev->devpath, 710 info->description); 711 goto done; 712 } 713 714 // insist peer be connected 715 if (info->check_connect && (retval = info->check_connect (dev)) < 0) { 716 if (netif_msg_ifup (dev)) 717 devdbg (dev, "can't open; %d", retval); 718 goto done; 719 } 720 721 /* start any status interrupt transfer */ 722 if (dev->interrupt) { 723 retval = usb_submit_urb (dev->interrupt, GFP_KERNEL); 724 if (retval < 0) { 725 if (netif_msg_ifup (dev)) 726 deverr (dev, "intr submit %d", retval); 727 goto done; 728 } 729 } 730 731 netif_start_queue (net); 732 if (netif_msg_ifup (dev)) { 733 char *framing; 734 735 if (dev->driver_info->flags & FLAG_FRAMING_NC) 736 framing = "NetChip"; 737 else if (dev->driver_info->flags & FLAG_FRAMING_GL) 738 framing = "GeneSys"; 739 else if (dev->driver_info->flags & FLAG_FRAMING_Z) 740 framing = "Zaurus"; 741 else if (dev->driver_info->flags & FLAG_FRAMING_RN) 742 framing = "RNDIS"; 743 else if (dev->driver_info->flags & FLAG_FRAMING_AX) 744 framing = "ASIX"; 745 else 746 framing = "simple"; 747 748 devinfo (dev, "open: enable queueing " 749 "(rx %d, tx %d) mtu %d %s framing", 750 (int)RX_QLEN (dev), (int)TX_QLEN (dev), dev->net->mtu, 751 framing); 752 } 753 754 // delay posting reads until we're fully open 755 tasklet_schedule (&dev->bh); 756 return retval; 757 done: 758 usb_autopm_put_interface(dev->intf); 759 done_nopm: 760 return retval; 761 } 762 EXPORT_SYMBOL_GPL(usbnet_open); 763 764 /*-------------------------------------------------------------------------*/ 765 766 /* ethtool methods; minidrivers may need to add some more, but 767 * they'll probably want to use this base set. 768 */ 769 770 int 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 } 779 EXPORT_SYMBOL_GPL(usbnet_get_settings); 780 781 int 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 } 798 EXPORT_SYMBOL_GPL(usbnet_set_settings); 799 800 u32 usbnet_get_link (struct net_device *net) 801 { 802 struct usbnet *dev = netdev_priv(net); 803 804 /* If a check_connect is defined, return its result */ 805 if (dev->driver_info->check_connect) 806 return dev->driver_info->check_connect (dev) == 0; 807 808 /* if the device has mii operations, use those */ 809 if (dev->mii.mdio_read) 810 return mii_link_ok(&dev->mii); 811 812 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ 813 return ethtool_op_get_link(net); 814 } 815 EXPORT_SYMBOL_GPL(usbnet_get_link); 816 817 int 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 } 826 EXPORT_SYMBOL_GPL(usbnet_nway_reset); 827 828 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) 829 { 830 struct usbnet *dev = netdev_priv(net); 831 832 strncpy (info->driver, dev->driver_name, sizeof info->driver); 833 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 } 838 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); 839 840 u32 usbnet_get_msglevel (struct net_device *net) 841 { 842 struct usbnet *dev = netdev_priv(net); 843 844 return dev->msg_enable; 845 } 846 EXPORT_SYMBOL_GPL(usbnet_get_msglevel); 847 848 void usbnet_set_msglevel (struct net_device *net, u32 level) 849 { 850 struct usbnet *dev = netdev_priv(net); 851 852 dev->msg_enable = level; 853 } 854 EXPORT_SYMBOL_GPL(usbnet_set_msglevel); 855 856 /* drivers may override default ethtool_ops in their bind() routine */ 857 static const struct ethtool_ops usbnet_ethtool_ops = { 858 .get_settings = usbnet_get_settings, 859 .set_settings = usbnet_set_settings, 860 .get_link = usbnet_get_link, 861 .nway_reset = usbnet_nway_reset, 862 .get_drvinfo = usbnet_get_drvinfo, 863 .get_msglevel = usbnet_get_msglevel, 864 .set_msglevel = usbnet_set_msglevel, 865 }; 866 867 /*-------------------------------------------------------------------------*/ 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 */ 874 static void 875 kevent (struct work_struct *work) 876 { 877 struct usbnet *dev = 878 container_of(work, struct usbnet, kevent); 879 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); 884 status = usb_clear_halt (dev->udev, dev->out); 885 if (status < 0 886 && status != -EPIPE 887 && status != -ESHUTDOWN) { 888 if (netif_msg_tx_err (dev)) 889 deverr (dev, "can't clear tx halt, status %d", 890 status); 891 } else { 892 clear_bit (EVENT_TX_HALT, &dev->flags); 893 if (status != -ESHUTDOWN) 894 netif_wake_queue (dev->net); 895 } 896 } 897 if (test_bit (EVENT_RX_HALT, &dev->flags)) { 898 unlink_urbs (dev, &dev->rxq); 899 status = usb_clear_halt (dev->udev, dev->in); 900 if (status < 0 901 && status != -EPIPE 902 && status != -ESHUTDOWN) { 903 if (netif_msg_rx_err (dev)) 904 deverr (dev, "can't clear rx halt, status %d", 905 status); 906 } else { 907 clear_bit (EVENT_RX_HALT, &dev->flags); 908 tasklet_schedule (&dev->bh); 909 } 910 } 911 912 /* tasklet could resubmit itself forever if memory is tight */ 913 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { 914 struct urb *urb = NULL; 915 916 if (netif_running (dev->net)) 917 urb = usb_alloc_urb (0, GFP_KERNEL); 918 else 919 clear_bit (EVENT_RX_MEMORY, &dev->flags); 920 if (urb != NULL) { 921 clear_bit (EVENT_RX_MEMORY, &dev->flags); 922 rx_submit (dev, urb, GFP_KERNEL); 923 tasklet_schedule (&dev->bh); 924 } 925 } 926 927 if (test_bit (EVENT_LINK_RESET, &dev->flags)) { 928 struct driver_info *info = dev->driver_info; 929 int retval = 0; 930 931 clear_bit (EVENT_LINK_RESET, &dev->flags); 932 if(info->link_reset && (retval = info->link_reset(dev)) < 0) { 933 devinfo(dev, "link reset failed (%d) usbnet usb-%s-%s, %s", 934 retval, 935 dev->udev->bus->bus_name, dev->udev->devpath, 936 info->description); 937 } 938 } 939 940 if (dev->flags) 941 devdbg (dev, "kevent done, flags = 0x%lx", 942 dev->flags); 943 } 944 945 /*-------------------------------------------------------------------------*/ 946 947 static void tx_complete (struct urb *urb) 948 { 949 struct sk_buff *skb = (struct sk_buff *) urb->context; 950 struct skb_data *entry = (struct skb_data *) skb->cb; 951 struct usbnet *dev = entry->dev; 952 953 if (urb->status == 0) { 954 dev->net->stats.tx_packets++; 955 dev->net->stats.tx_bytes += entry->length; 956 } else { 957 dev->net->stats.tx_errors++; 958 959 switch (urb->status) { 960 case -EPIPE: 961 usbnet_defer_kevent (dev, EVENT_TX_HALT); 962 break; 963 964 /* software-driven interface shutdown */ 965 case -ECONNRESET: // async unlink 966 case -ESHUTDOWN: // hardware gone 967 break; 968 969 // like rx, tx gets controller i/o faults during khubd delays 970 // and so it uses the same throttling mechanism. 971 case -EPROTO: 972 case -ETIME: 973 case -EILSEQ: 974 if (!timer_pending (&dev->delay)) { 975 mod_timer (&dev->delay, 976 jiffies + THROTTLE_JIFFIES); 977 if (netif_msg_link (dev)) 978 devdbg (dev, "tx throttle %d", 979 urb->status); 980 } 981 netif_stop_queue (dev->net); 982 break; 983 default: 984 if (netif_msg_tx_err (dev)) 985 devdbg (dev, "tx err %d", entry->urb->status); 986 break; 987 } 988 } 989 990 urb->dev = NULL; 991 entry->state = tx_done; 992 defer_bh(dev, skb, &dev->txq); 993 } 994 995 /*-------------------------------------------------------------------------*/ 996 997 void usbnet_tx_timeout (struct net_device *net) 998 { 999 struct usbnet *dev = netdev_priv(net); 1000 1001 unlink_urbs (dev, &dev->txq); 1002 tasklet_schedule (&dev->bh); 1003 1004 // FIXME: device recovery -- reset? 1005 } 1006 EXPORT_SYMBOL_GPL(usbnet_tx_timeout); 1007 1008 /*-------------------------------------------------------------------------*/ 1009 1010 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, 1011 struct net_device *net) 1012 { 1013 struct usbnet *dev = netdev_priv(net); 1014 int length; 1015 struct urb *urb = NULL; 1016 struct skb_data *entry; 1017 struct driver_info *info = dev->driver_info; 1018 unsigned long flags; 1019 int retval; 1020 1021 // some devices want funky USB-level framing, for 1022 // win32 driver (usually) and/or hardware quirks 1023 if (info->tx_fixup) { 1024 skb = info->tx_fixup (dev, skb, GFP_ATOMIC); 1025 if (!skb) { 1026 if (netif_msg_tx_err (dev)) 1027 devdbg (dev, "can't tx_fixup skb"); 1028 goto drop; 1029 } 1030 } 1031 length = skb->len; 1032 1033 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { 1034 if (netif_msg_tx_err (dev)) 1035 devdbg (dev, "no urb"); 1036 goto drop; 1037 } 1038 1039 entry = (struct skb_data *) skb->cb; 1040 entry->urb = urb; 1041 entry->dev = dev; 1042 entry->state = tx_start; 1043 entry->length = length; 1044 1045 usb_fill_bulk_urb (urb, dev->udev, dev->out, 1046 skb->data, skb->len, tx_complete, skb); 1047 1048 /* don't assume the hardware handles USB_ZERO_PACKET 1049 * NOTE: strictly conforming cdc-ether devices should expect 1050 * the ZLP here, but ignore the one-byte packet. 1051 */ 1052 if ((length % dev->maxpacket) == 0) { 1053 urb->transfer_buffer_length++; 1054 if (skb_tailroom(skb)) { 1055 skb->data[skb->len] = 0; 1056 __skb_put(skb, 1); 1057 } 1058 } 1059 1060 spin_lock_irqsave (&dev->txq.lock, flags); 1061 1062 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { 1063 case -EPIPE: 1064 netif_stop_queue (net); 1065 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1066 break; 1067 default: 1068 if (netif_msg_tx_err (dev)) 1069 devdbg (dev, "tx: submit urb err %d", retval); 1070 break; 1071 case 0: 1072 net->trans_start = jiffies; 1073 __skb_queue_tail (&dev->txq, skb); 1074 if (dev->txq.qlen >= TX_QLEN (dev)) 1075 netif_stop_queue (net); 1076 } 1077 spin_unlock_irqrestore (&dev->txq.lock, flags); 1078 1079 if (retval) { 1080 if (netif_msg_tx_err (dev)) 1081 devdbg (dev, "drop, code %d", retval); 1082 drop: 1083 dev->net->stats.tx_dropped++; 1084 if (skb) 1085 dev_kfree_skb_any (skb); 1086 usb_free_urb (urb); 1087 } else if (netif_msg_tx_queued (dev)) { 1088 devdbg (dev, "> tx, len %d, type 0x%x", 1089 length, skb->protocol); 1090 } 1091 return NETDEV_TX_OK; 1092 } 1093 EXPORT_SYMBOL_GPL(usbnet_start_xmit); 1094 1095 /*-------------------------------------------------------------------------*/ 1096 1097 // tasklet (work deferred from completions, in_irq) or timer 1098 1099 static void usbnet_bh (unsigned long param) 1100 { 1101 struct usbnet *dev = (struct usbnet *) param; 1102 struct sk_buff *skb; 1103 struct skb_data *entry; 1104 1105 while ((skb = skb_dequeue (&dev->done))) { 1106 entry = (struct skb_data *) skb->cb; 1107 switch (entry->state) { 1108 case rx_done: 1109 entry->state = rx_cleanup; 1110 rx_process (dev, skb); 1111 continue; 1112 case tx_done: 1113 case rx_cleanup: 1114 usb_free_urb (entry->urb); 1115 dev_kfree_skb (skb); 1116 continue; 1117 default: 1118 devdbg (dev, "bogus skb state %d", entry->state); 1119 } 1120 } 1121 1122 // waiting for all pending urbs to complete? 1123 if (dev->wait) { 1124 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) { 1125 wake_up (dev->wait); 1126 } 1127 1128 // or are we maybe short a few urbs? 1129 } else if (netif_running (dev->net) 1130 && netif_device_present (dev->net) 1131 && !timer_pending (&dev->delay) 1132 && !test_bit (EVENT_RX_HALT, &dev->flags)) { 1133 int temp = dev->rxq.qlen; 1134 int qlen = RX_QLEN (dev); 1135 1136 if (temp < qlen) { 1137 struct urb *urb; 1138 int i; 1139 1140 // don't refill the queue all at once 1141 for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) { 1142 urb = usb_alloc_urb (0, GFP_ATOMIC); 1143 if (urb != NULL) 1144 rx_submit (dev, urb, GFP_ATOMIC); 1145 } 1146 if (temp != dev->rxq.qlen && netif_msg_link (dev)) 1147 devdbg (dev, "rxqlen %d --> %d", 1148 temp, dev->rxq.qlen); 1149 if (dev->rxq.qlen < qlen) 1150 tasklet_schedule (&dev->bh); 1151 } 1152 if (dev->txq.qlen < TX_QLEN (dev)) 1153 netif_wake_queue (dev->net); 1154 } 1155 } 1156 1157 1158 /*------------------------------------------------------------------------- 1159 * 1160 * USB Device Driver support 1161 * 1162 *-------------------------------------------------------------------------*/ 1163 1164 // precondition: never called in_interrupt 1165 1166 void usbnet_disconnect (struct usb_interface *intf) 1167 { 1168 struct usbnet *dev; 1169 struct usb_device *xdev; 1170 struct net_device *net; 1171 1172 dev = usb_get_intfdata(intf); 1173 usb_set_intfdata(intf, NULL); 1174 if (!dev) 1175 return; 1176 1177 xdev = interface_to_usbdev (intf); 1178 1179 if (netif_msg_probe (dev)) 1180 devinfo (dev, "unregister '%s' usb-%s-%s, %s", 1181 intf->dev.driver->name, 1182 xdev->bus->bus_name, xdev->devpath, 1183 dev->driver_info->description); 1184 1185 net = dev->net; 1186 unregister_netdev (net); 1187 1188 /* we don't hold rtnl here ... */ 1189 flush_scheduled_work (); 1190 1191 if (dev->driver_info->unbind) 1192 dev->driver_info->unbind (dev, intf); 1193 1194 free_netdev(net); 1195 usb_put_dev (xdev); 1196 } 1197 EXPORT_SYMBOL_GPL(usbnet_disconnect); 1198 1199 static const struct net_device_ops usbnet_netdev_ops = { 1200 .ndo_open = usbnet_open, 1201 .ndo_stop = usbnet_stop, 1202 .ndo_start_xmit = usbnet_start_xmit, 1203 .ndo_tx_timeout = usbnet_tx_timeout, 1204 .ndo_change_mtu = usbnet_change_mtu, 1205 .ndo_set_mac_address = eth_mac_addr, 1206 .ndo_validate_addr = eth_validate_addr, 1207 }; 1208 1209 /*-------------------------------------------------------------------------*/ 1210 1211 // precondition: never called in_interrupt 1212 1213 int 1214 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) 1215 { 1216 struct usbnet *dev; 1217 struct net_device *net; 1218 struct usb_host_interface *interface; 1219 struct driver_info *info; 1220 struct usb_device *xdev; 1221 int status; 1222 const char *name; 1223 1224 name = udev->dev.driver->name; 1225 info = (struct driver_info *) prod->driver_info; 1226 if (!info) { 1227 dev_dbg (&udev->dev, "blacklisted by %s\n", name); 1228 return -ENODEV; 1229 } 1230 xdev = interface_to_usbdev (udev); 1231 interface = udev->cur_altsetting; 1232 1233 usb_get_dev (xdev); 1234 1235 status = -ENOMEM; 1236 1237 // set up our own records 1238 net = alloc_etherdev(sizeof(*dev)); 1239 if (!net) { 1240 dbg ("can't kmalloc dev"); 1241 goto out; 1242 } 1243 1244 dev = netdev_priv(net); 1245 dev->udev = xdev; 1246 dev->intf = udev; 1247 dev->driver_info = info; 1248 dev->driver_name = name; 1249 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV 1250 | NETIF_MSG_PROBE | NETIF_MSG_LINK); 1251 skb_queue_head_init (&dev->rxq); 1252 skb_queue_head_init (&dev->txq); 1253 skb_queue_head_init (&dev->done); 1254 skb_queue_head_init(&dev->rxq_pause); 1255 dev->bh.func = usbnet_bh; 1256 dev->bh.data = (unsigned long) dev; 1257 INIT_WORK (&dev->kevent, kevent); 1258 dev->delay.function = usbnet_bh; 1259 dev->delay.data = (unsigned long) dev; 1260 init_timer (&dev->delay); 1261 mutex_init (&dev->phy_mutex); 1262 1263 dev->net = net; 1264 strcpy (net->name, "usb%d"); 1265 memcpy (net->dev_addr, node_id, sizeof node_id); 1266 1267 /* rx and tx sides can use different message sizes; 1268 * bind() should set rx_urb_size in that case. 1269 */ 1270 dev->hard_mtu = net->mtu + net->hard_header_len; 1271 #if 0 1272 // dma_supported() is deeply broken on almost all architectures 1273 // possible with some EHCI controllers 1274 if (dma_supported (&udev->dev, DMA_BIT_MASK(64))) 1275 net->features |= NETIF_F_HIGHDMA; 1276 #endif 1277 1278 net->netdev_ops = &usbnet_netdev_ops; 1279 net->watchdog_timeo = TX_TIMEOUT_JIFFIES; 1280 net->ethtool_ops = &usbnet_ethtool_ops; 1281 1282 // allow device-specific bind/init procedures 1283 // NOTE net->name still not usable ... 1284 if (info->bind) { 1285 status = info->bind (dev, udev); 1286 if (status < 0) 1287 goto out1; 1288 1289 // heuristic: "usb%d" for links we know are two-host, 1290 // else "eth%d" when there's reasonable doubt. userspace 1291 // can rename the link if it knows better. 1292 if ((dev->driver_info->flags & FLAG_ETHER) != 0 1293 && (net->dev_addr [0] & 0x02) == 0) 1294 strcpy (net->name, "eth%d"); 1295 /* WLAN devices should always be named "wlan%d" */ 1296 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1297 strcpy(net->name, "wlan%d"); 1298 1299 /* maybe the remote can't receive an Ethernet MTU */ 1300 if (net->mtu > (dev->hard_mtu - net->hard_header_len)) 1301 net->mtu = dev->hard_mtu - net->hard_header_len; 1302 } else if (!info->in || !info->out) 1303 status = usbnet_get_endpoints (dev, udev); 1304 else { 1305 dev->in = usb_rcvbulkpipe (xdev, info->in); 1306 dev->out = usb_sndbulkpipe (xdev, info->out); 1307 if (!(info->flags & FLAG_NO_SETINT)) 1308 status = usb_set_interface (xdev, 1309 interface->desc.bInterfaceNumber, 1310 interface->desc.bAlternateSetting); 1311 else 1312 status = 0; 1313 1314 } 1315 if (status >= 0 && dev->status) 1316 status = init_status (dev, udev); 1317 if (status < 0) 1318 goto out3; 1319 1320 if (!dev->rx_urb_size) 1321 dev->rx_urb_size = dev->hard_mtu; 1322 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); 1323 1324 SET_NETDEV_DEV(net, &udev->dev); 1325 status = register_netdev (net); 1326 if (status) 1327 goto out3; 1328 if (netif_msg_probe (dev)) 1329 devinfo (dev, "register '%s' at usb-%s-%s, %s, %pM", 1330 udev->dev.driver->name, 1331 xdev->bus->bus_name, xdev->devpath, 1332 dev->driver_info->description, 1333 net->dev_addr); 1334 1335 // ok, it's ready to go. 1336 usb_set_intfdata (udev, dev); 1337 1338 // start as if the link is up 1339 netif_device_attach (net); 1340 1341 return 0; 1342 1343 out3: 1344 if (info->unbind) 1345 info->unbind (dev, udev); 1346 out1: 1347 free_netdev(net); 1348 out: 1349 usb_put_dev(xdev); 1350 return status; 1351 } 1352 EXPORT_SYMBOL_GPL(usbnet_probe); 1353 1354 /*-------------------------------------------------------------------------*/ 1355 1356 /* 1357 * suspend the whole driver as soon as the first interface is suspended 1358 * resume only when the last interface is resumed 1359 */ 1360 1361 int usbnet_suspend (struct usb_interface *intf, pm_message_t message) 1362 { 1363 struct usbnet *dev = usb_get_intfdata(intf); 1364 1365 if (!dev->suspend_count++) { 1366 /* 1367 * accelerate emptying of the rx and queues, to avoid 1368 * having everything error out. 1369 */ 1370 netif_device_detach (dev->net); 1371 (void) unlink_urbs (dev, &dev->rxq); 1372 (void) unlink_urbs (dev, &dev->txq); 1373 /* 1374 * reattach so runtime management can use and 1375 * wake the device 1376 */ 1377 netif_device_attach (dev->net); 1378 } 1379 return 0; 1380 } 1381 EXPORT_SYMBOL_GPL(usbnet_suspend); 1382 1383 int usbnet_resume (struct usb_interface *intf) 1384 { 1385 struct usbnet *dev = usb_get_intfdata(intf); 1386 1387 if (!--dev->suspend_count) 1388 tasklet_schedule (&dev->bh); 1389 1390 return 0; 1391 } 1392 EXPORT_SYMBOL_GPL(usbnet_resume); 1393 1394 1395 /*-------------------------------------------------------------------------*/ 1396 1397 static int __init usbnet_init(void) 1398 { 1399 /* compiler should optimize this out */ 1400 BUILD_BUG_ON (sizeof (((struct sk_buff *)0)->cb) 1401 < sizeof (struct skb_data)); 1402 1403 random_ether_addr(node_id); 1404 return 0; 1405 } 1406 module_init(usbnet_init); 1407 1408 static void __exit usbnet_exit(void) 1409 { 1410 } 1411 module_exit(usbnet_exit); 1412 1413 MODULE_AUTHOR("David Brownell"); 1414 MODULE_DESCRIPTION("USB network driver framework"); 1415 MODULE_LICENSE("GPL"); 1416