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 #include <linux/slab.h> 47 48 #define DRIVER_VERSION "22-Aug-2005" 49 50 51 /*-------------------------------------------------------------------------*/ 52 53 /* 54 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max. 55 * Several dozen bytes of IPv4 data can fit in two such transactions. 56 * One maximum size Ethernet packet takes twenty four of them. 57 * For high speed, each frame comfortably fits almost 36 max size 58 * Ethernet packets (so queues should be bigger). 59 * 60 * REVISIT qlens should be members of 'struct usbnet'; the goal is to 61 * let the USB host controller be busy for 5msec or more before an irq 62 * is required, under load. Jumbograms change the equation. 63 */ 64 #define RX_MAX_QUEUE_MEMORY (60 * 1518) 65 #define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \ 66 (RX_MAX_QUEUE_MEMORY/(dev)->rx_urb_size) : 4) 67 #define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \ 68 (RX_MAX_QUEUE_MEMORY/(dev)->hard_mtu) : 4) 69 70 // reawaken network queue this soon after stopping; else watchdog barks 71 #define TX_TIMEOUT_JIFFIES (5*HZ) 72 73 // throttle rx/tx briefly after some faults, so khubd might disconnect() 74 // us (it polls at HZ/4 usually) before we report too many false errors. 75 #define THROTTLE_JIFFIES (HZ/8) 76 77 // between wakeups 78 #define UNLINK_TIMEOUT_MS 3 79 80 /*-------------------------------------------------------------------------*/ 81 82 // randomly generated ethernet address 83 static u8 node_id [ETH_ALEN]; 84 85 static const char driver_name [] = "usbnet"; 86 87 /* use ethtool to change the level for any given device */ 88 static int msg_level = -1; 89 module_param (msg_level, int, 0); 90 MODULE_PARM_DESC (msg_level, "Override default message level"); 91 92 /*-------------------------------------------------------------------------*/ 93 94 /* handles CDC Ethernet and many other network "bulk data" interfaces */ 95 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf) 96 { 97 int tmp; 98 struct usb_host_interface *alt = NULL; 99 struct usb_host_endpoint *in = NULL, *out = NULL; 100 struct usb_host_endpoint *status = NULL; 101 102 for (tmp = 0; tmp < intf->num_altsetting; tmp++) { 103 unsigned ep; 104 105 in = out = status = NULL; 106 alt = intf->altsetting + tmp; 107 108 /* take the first altsetting with in-bulk + out-bulk; 109 * remember any status endpoint, just in case; 110 * ignore other endpoints and altsetttings. 111 */ 112 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) { 113 struct usb_host_endpoint *e; 114 int intr = 0; 115 116 e = alt->endpoint + ep; 117 switch (e->desc.bmAttributes) { 118 case USB_ENDPOINT_XFER_INT: 119 if (!usb_endpoint_dir_in(&e->desc)) 120 continue; 121 intr = 1; 122 /* FALLTHROUGH */ 123 case USB_ENDPOINT_XFER_BULK: 124 break; 125 default: 126 continue; 127 } 128 if (usb_endpoint_dir_in(&e->desc)) { 129 if (!intr && !in) 130 in = e; 131 else if (intr && !status) 132 status = e; 133 } else { 134 if (!out) 135 out = e; 136 } 137 } 138 if (in && out) 139 break; 140 } 141 if (!alt || !in || !out) 142 return -EINVAL; 143 144 if (alt->desc.bAlternateSetting != 0 || 145 !(dev->driver_info->flags & FLAG_NO_SETINT)) { 146 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber, 147 alt->desc.bAlternateSetting); 148 if (tmp < 0) 149 return tmp; 150 } 151 152 dev->in = usb_rcvbulkpipe (dev->udev, 153 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 154 dev->out = usb_sndbulkpipe (dev->udev, 155 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 156 dev->status = status; 157 return 0; 158 } 159 EXPORT_SYMBOL_GPL(usbnet_get_endpoints); 160 161 static u8 nibble(unsigned char c) 162 { 163 if (likely(isdigit(c))) 164 return c - '0'; 165 c = toupper(c); 166 if (likely(isxdigit(c))) 167 return 10 + c - 'A'; 168 return 0; 169 } 170 171 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress) 172 { 173 int tmp, i; 174 unsigned char buf [13]; 175 176 tmp = usb_string(dev->udev, iMACAddress, buf, sizeof buf); 177 if (tmp != 12) { 178 dev_dbg(&dev->udev->dev, 179 "bad MAC string %d fetch, %d\n", iMACAddress, tmp); 180 if (tmp >= 0) 181 tmp = -EINVAL; 182 return tmp; 183 } 184 for (i = tmp = 0; i < 6; i++, tmp += 2) 185 dev->net->dev_addr [i] = 186 (nibble(buf [tmp]) << 4) + nibble(buf [tmp + 1]); 187 return 0; 188 } 189 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr); 190 191 static void intr_complete (struct urb *urb); 192 193 static int init_status (struct usbnet *dev, struct usb_interface *intf) 194 { 195 char *buf = NULL; 196 unsigned pipe = 0; 197 unsigned maxp; 198 unsigned period; 199 200 if (!dev->driver_info->status) 201 return 0; 202 203 pipe = usb_rcvintpipe (dev->udev, 204 dev->status->desc.bEndpointAddress 205 & USB_ENDPOINT_NUMBER_MASK); 206 maxp = usb_maxpacket (dev->udev, pipe, 0); 207 208 /* avoid 1 msec chatter: min 8 msec poll rate */ 209 period = max ((int) dev->status->desc.bInterval, 210 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3); 211 212 buf = kmalloc (maxp, GFP_KERNEL); 213 if (buf) { 214 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL); 215 if (!dev->interrupt) { 216 kfree (buf); 217 return -ENOMEM; 218 } else { 219 usb_fill_int_urb(dev->interrupt, dev->udev, pipe, 220 buf, maxp, intr_complete, dev, period); 221 dev_dbg(&intf->dev, 222 "status ep%din, %d bytes period %d\n", 223 usb_pipeendpoint(pipe), maxp, period); 224 } 225 } 226 return 0; 227 } 228 229 /* Passes this packet up the stack, updating its accounting. 230 * Some link protocols batch packets, so their rx_fixup paths 231 * can return clones as well as just modify the original skb. 232 */ 233 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb) 234 { 235 int status; 236 237 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) { 238 skb_queue_tail(&dev->rxq_pause, skb); 239 return; 240 } 241 242 skb->protocol = eth_type_trans (skb, dev->net); 243 dev->net->stats.rx_packets++; 244 dev->net->stats.rx_bytes += skb->len; 245 246 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n", 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) 251 netif_dbg(dev, rx_err, dev->net, 252 "netif_rx status %d\n", status); 253 } 254 EXPORT_SYMBOL_GPL(usbnet_skb_return); 255 256 257 /*------------------------------------------------------------------------- 258 * 259 * Network Device Driver (peer link to "Host Device", from USB host) 260 * 261 *-------------------------------------------------------------------------*/ 262 263 int usbnet_change_mtu (struct net_device *net, int new_mtu) 264 { 265 struct usbnet *dev = netdev_priv(net); 266 int ll_mtu = new_mtu + net->hard_header_len; 267 int old_hard_mtu = dev->hard_mtu; 268 int old_rx_urb_size = dev->rx_urb_size; 269 270 if (new_mtu <= 0) 271 return -EINVAL; 272 // no second zero-length packet read wanted after mtu-sized packets 273 if ((ll_mtu % dev->maxpacket) == 0) 274 return -EDOM; 275 net->mtu = new_mtu; 276 277 dev->hard_mtu = net->mtu + net->hard_header_len; 278 if (dev->rx_urb_size == old_hard_mtu) { 279 dev->rx_urb_size = dev->hard_mtu; 280 if (dev->rx_urb_size > old_rx_urb_size) 281 usbnet_unlink_rx_urbs(dev); 282 } 283 284 return 0; 285 } 286 EXPORT_SYMBOL_GPL(usbnet_change_mtu); 287 288 /*-------------------------------------------------------------------------*/ 289 290 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from 291 * completion callbacks. 2.5 should have fixed those bugs... 292 */ 293 294 static void defer_bh(struct usbnet *dev, struct sk_buff *skb, struct sk_buff_head *list) 295 { 296 unsigned long flags; 297 298 spin_lock_irqsave(&list->lock, flags); 299 __skb_unlink(skb, list); 300 spin_unlock(&list->lock); 301 spin_lock(&dev->done.lock); 302 __skb_queue_tail(&dev->done, skb); 303 if (dev->done.qlen == 1) 304 tasklet_schedule(&dev->bh); 305 spin_unlock_irqrestore(&dev->done.lock, flags); 306 } 307 308 /* some work can't be done in tasklets, so we use keventd 309 * 310 * NOTE: annoying asymmetry: if it's active, schedule_work() fails, 311 * but tasklet_schedule() doesn't. hope the failure is rare. 312 */ 313 void usbnet_defer_kevent (struct usbnet *dev, int work) 314 { 315 set_bit (work, &dev->flags); 316 if (!schedule_work (&dev->kevent)) 317 netdev_err(dev->net, "kevent %d may have been dropped\n", work); 318 else 319 netdev_dbg(dev->net, "kevent %d scheduled\n", work); 320 } 321 EXPORT_SYMBOL_GPL(usbnet_defer_kevent); 322 323 /*-------------------------------------------------------------------------*/ 324 325 static void rx_complete (struct urb *urb); 326 327 static void rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) 328 { 329 struct sk_buff *skb; 330 struct skb_data *entry; 331 int retval = 0; 332 unsigned long lockflags; 333 size_t size = dev->rx_urb_size; 334 335 if ((skb = alloc_skb (size + NET_IP_ALIGN, flags)) == NULL) { 336 netif_dbg(dev, rx_err, dev->net, "no rx skb\n"); 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 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) { 358 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) { 359 case -EPIPE: 360 usbnet_defer_kevent (dev, EVENT_RX_HALT); 361 break; 362 case -ENOMEM: 363 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 364 break; 365 case -ENODEV: 366 netif_dbg(dev, ifdown, dev->net, "device gone\n"); 367 netif_device_detach (dev->net); 368 break; 369 default: 370 netif_dbg(dev, rx_err, dev->net, 371 "rx submit, %d\n", retval); 372 tasklet_schedule (&dev->bh); 373 break; 374 case 0: 375 __skb_queue_tail (&dev->rxq, skb); 376 } 377 } else { 378 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n"); 379 retval = -ENOLINK; 380 } 381 spin_unlock_irqrestore (&dev->rxq.lock, lockflags); 382 if (retval) { 383 dev_kfree_skb_any (skb); 384 usb_free_urb (urb); 385 } 386 } 387 388 389 /*-------------------------------------------------------------------------*/ 390 391 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb) 392 { 393 if (dev->driver_info->rx_fixup && 394 !dev->driver_info->rx_fixup (dev, skb)) 395 goto error; 396 // else network stack removes extra byte if we forced a short packet 397 398 if (skb->len) 399 usbnet_skb_return (dev, skb); 400 else { 401 netif_dbg(dev, rx_err, dev->net, "drop\n"); 402 error: 403 dev->net->stats.rx_errors++; 404 skb_queue_tail (&dev->done, skb); 405 } 406 } 407 408 /*-------------------------------------------------------------------------*/ 409 410 static void rx_complete (struct urb *urb) 411 { 412 struct sk_buff *skb = (struct sk_buff *) urb->context; 413 struct skb_data *entry = (struct skb_data *) skb->cb; 414 struct usbnet *dev = entry->dev; 415 int urb_status = urb->status; 416 417 skb_put (skb, urb->actual_length); 418 entry->state = rx_done; 419 entry->urb = NULL; 420 421 switch (urb_status) { 422 /* success */ 423 case 0: 424 if (skb->len < dev->net->hard_header_len) { 425 entry->state = rx_cleanup; 426 dev->net->stats.rx_errors++; 427 dev->net->stats.rx_length_errors++; 428 netif_dbg(dev, rx_err, dev->net, 429 "rx length %d\n", skb->len); 430 } 431 break; 432 433 /* stalls need manual reset. this is rare ... except that 434 * when going through USB 2.0 TTs, unplug appears this way. 435 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ 436 * storm, recovering as needed. 437 */ 438 case -EPIPE: 439 dev->net->stats.rx_errors++; 440 usbnet_defer_kevent (dev, EVENT_RX_HALT); 441 // FALLTHROUGH 442 443 /* software-driven interface shutdown */ 444 case -ECONNRESET: /* async unlink */ 445 case -ESHUTDOWN: /* hardware gone */ 446 netif_dbg(dev, ifdown, dev->net, 447 "rx shutdown, code %d\n", urb_status); 448 goto block; 449 450 /* we get controller i/o faults during khubd disconnect() delays. 451 * throttle down resubmits, to avoid log floods; just temporarily, 452 * so we still recover when the fault isn't a khubd delay. 453 */ 454 case -EPROTO: 455 case -ETIME: 456 case -EILSEQ: 457 dev->net->stats.rx_errors++; 458 if (!timer_pending (&dev->delay)) { 459 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); 460 netif_dbg(dev, link, dev->net, 461 "rx throttle %d\n", urb_status); 462 } 463 block: 464 entry->state = rx_cleanup; 465 entry->urb = urb; 466 urb = NULL; 467 break; 468 469 /* data overrun ... flush fifo? */ 470 case -EOVERFLOW: 471 dev->net->stats.rx_over_errors++; 472 // FALLTHROUGH 473 474 default: 475 entry->state = rx_cleanup; 476 dev->net->stats.rx_errors++; 477 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status); 478 break; 479 } 480 481 defer_bh(dev, skb, &dev->rxq); 482 483 if (urb) { 484 if (netif_running (dev->net) && 485 !test_bit (EVENT_RX_HALT, &dev->flags)) { 486 rx_submit (dev, urb, GFP_ATOMIC); 487 return; 488 } 489 usb_free_urb (urb); 490 } 491 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n"); 492 } 493 494 static void intr_complete (struct urb *urb) 495 { 496 struct usbnet *dev = urb->context; 497 int status = urb->status; 498 499 switch (status) { 500 /* success */ 501 case 0: 502 dev->driver_info->status(dev, urb); 503 break; 504 505 /* software-driven interface shutdown */ 506 case -ENOENT: /* urb killed */ 507 case -ESHUTDOWN: /* hardware gone */ 508 netif_dbg(dev, ifdown, dev->net, 509 "intr shutdown, code %d\n", status); 510 return; 511 512 /* NOTE: not throttling like RX/TX, since this endpoint 513 * already polls infrequently 514 */ 515 default: 516 netdev_dbg(dev->net, "intr status %d\n", status); 517 break; 518 } 519 520 if (!netif_running (dev->net)) 521 return; 522 523 memset(urb->transfer_buffer, 0, urb->transfer_buffer_length); 524 status = usb_submit_urb (urb, GFP_ATOMIC); 525 if (status != 0) 526 netif_err(dev, timer, dev->net, 527 "intr resubmit --> %d\n", status); 528 } 529 530 /*-------------------------------------------------------------------------*/ 531 void usbnet_pause_rx(struct usbnet *dev) 532 { 533 set_bit(EVENT_RX_PAUSED, &dev->flags); 534 535 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n"); 536 } 537 EXPORT_SYMBOL_GPL(usbnet_pause_rx); 538 539 void usbnet_resume_rx(struct usbnet *dev) 540 { 541 struct sk_buff *skb; 542 int num = 0; 543 544 clear_bit(EVENT_RX_PAUSED, &dev->flags); 545 546 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) { 547 usbnet_skb_return(dev, skb); 548 num++; 549 } 550 551 tasklet_schedule(&dev->bh); 552 553 netif_dbg(dev, rx_status, dev->net, 554 "paused rx queue disabled, %d skbs requeued\n", num); 555 } 556 EXPORT_SYMBOL_GPL(usbnet_resume_rx); 557 558 void usbnet_purge_paused_rxq(struct usbnet *dev) 559 { 560 skb_queue_purge(&dev->rxq_pause); 561 } 562 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq); 563 564 /*-------------------------------------------------------------------------*/ 565 566 // unlink pending rx/tx; completion handlers do all other cleanup 567 568 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) 569 { 570 unsigned long flags; 571 struct sk_buff *skb, *skbnext; 572 int count = 0; 573 574 spin_lock_irqsave (&q->lock, flags); 575 skb_queue_walk_safe(q, skb, skbnext) { 576 struct skb_data *entry; 577 struct urb *urb; 578 int retval; 579 580 entry = (struct skb_data *) skb->cb; 581 urb = entry->urb; 582 583 // during some PM-driven resume scenarios, 584 // these (async) unlinks complete immediately 585 retval = usb_unlink_urb (urb); 586 if (retval != -EINPROGRESS && retval != 0) 587 netdev_dbg(dev->net, "unlink urb err, %d\n", retval); 588 else 589 count++; 590 } 591 spin_unlock_irqrestore (&q->lock, flags); 592 return count; 593 } 594 595 // Flush all pending rx urbs 596 // minidrivers may need to do this when the MTU changes 597 598 void usbnet_unlink_rx_urbs(struct usbnet *dev) 599 { 600 if (netif_running(dev->net)) { 601 (void) unlink_urbs (dev, &dev->rxq); 602 tasklet_schedule(&dev->bh); 603 } 604 } 605 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); 606 607 /*-------------------------------------------------------------------------*/ 608 609 // precondition: never called in_interrupt 610 static void usbnet_terminate_urbs(struct usbnet *dev) 611 { 612 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup); 613 DECLARE_WAITQUEUE(wait, current); 614 int temp; 615 616 /* ensure there are no more active urbs */ 617 add_wait_queue(&unlink_wakeup, &wait); 618 set_current_state(TASK_UNINTERRUPTIBLE); 619 dev->wait = &unlink_wakeup; 620 temp = unlink_urbs(dev, &dev->txq) + 621 unlink_urbs(dev, &dev->rxq); 622 623 /* maybe wait for deletions to finish. */ 624 while (!skb_queue_empty(&dev->rxq) 625 && !skb_queue_empty(&dev->txq) 626 && !skb_queue_empty(&dev->done)) { 627 schedule_timeout(UNLINK_TIMEOUT_MS); 628 set_current_state(TASK_UNINTERRUPTIBLE); 629 netif_dbg(dev, ifdown, dev->net, 630 "waited for %d urb completions\n", temp); 631 } 632 set_current_state(TASK_RUNNING); 633 dev->wait = NULL; 634 remove_wait_queue(&unlink_wakeup, &wait); 635 } 636 637 int usbnet_stop (struct net_device *net) 638 { 639 struct usbnet *dev = netdev_priv(net); 640 struct driver_info *info = dev->driver_info; 641 int retval; 642 643 netif_stop_queue (net); 644 645 netif_info(dev, ifdown, dev->net, 646 "stop stats: rx/tx %ld/%ld, errs %ld/%ld\n", 647 net->stats.rx_packets, net->stats.tx_packets, 648 net->stats.rx_errors, net->stats.tx_errors); 649 650 /* allow minidriver to stop correctly (wireless devices to turn off 651 * radio etc) */ 652 if (info->stop) { 653 retval = info->stop(dev); 654 if (retval < 0) 655 netif_info(dev, ifdown, dev->net, 656 "stop fail (%d) usbnet usb-%s-%s, %s\n", 657 retval, 658 dev->udev->bus->bus_name, dev->udev->devpath, 659 info->description); 660 } 661 662 if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) 663 usbnet_terminate_urbs(dev); 664 665 usb_kill_urb(dev->interrupt); 666 667 usbnet_purge_paused_rxq(dev); 668 669 /* deferred work (task, timer, softirq) must also stop. 670 * can't flush_scheduled_work() until we drop rtnl (later), 671 * else workers could deadlock; so make workers a NOP. 672 */ 673 dev->flags = 0; 674 del_timer_sync (&dev->delay); 675 tasklet_kill (&dev->bh); 676 if (info->manage_power) 677 info->manage_power(dev, 0); 678 else 679 usb_autopm_put_interface(dev->intf); 680 681 return 0; 682 } 683 EXPORT_SYMBOL_GPL(usbnet_stop); 684 685 /*-------------------------------------------------------------------------*/ 686 687 // posts reads, and enables write queuing 688 689 // precondition: never called in_interrupt 690 691 int usbnet_open (struct net_device *net) 692 { 693 struct usbnet *dev = netdev_priv(net); 694 int retval; 695 struct driver_info *info = dev->driver_info; 696 697 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { 698 netif_info(dev, ifup, dev->net, 699 "resumption fail (%d) usbnet usb-%s-%s, %s\n", 700 retval, 701 dev->udev->bus->bus_name, 702 dev->udev->devpath, 703 info->description); 704 goto done_nopm; 705 } 706 707 // put into "known safe" state 708 if (info->reset && (retval = info->reset (dev)) < 0) { 709 netif_info(dev, ifup, dev->net, 710 "open reset fail (%d) usbnet usb-%s-%s, %s\n", 711 retval, 712 dev->udev->bus->bus_name, 713 dev->udev->devpath, 714 info->description); 715 goto done; 716 } 717 718 // insist peer be connected 719 if (info->check_connect && (retval = info->check_connect (dev)) < 0) { 720 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval); 721 goto done; 722 } 723 724 /* start any status interrupt transfer */ 725 if (dev->interrupt) { 726 retval = usb_submit_urb (dev->interrupt, GFP_KERNEL); 727 if (retval < 0) { 728 netif_err(dev, ifup, dev->net, 729 "intr submit %d\n", retval); 730 goto done; 731 } 732 } 733 734 netif_start_queue (net); 735 netif_info(dev, ifup, dev->net, 736 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n", 737 (int)RX_QLEN(dev), (int)TX_QLEN(dev), 738 dev->net->mtu, 739 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" : 740 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" : 741 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" : 742 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" : 743 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" : 744 "simple"); 745 746 // delay posting reads until we're fully open 747 tasklet_schedule (&dev->bh); 748 if (info->manage_power) { 749 retval = info->manage_power(dev, 1); 750 if (retval < 0) 751 goto done; 752 usb_autopm_put_interface(dev->intf); 753 } 754 return retval; 755 756 done: 757 usb_autopm_put_interface(dev->intf); 758 done_nopm: 759 return retval; 760 } 761 EXPORT_SYMBOL_GPL(usbnet_open); 762 763 /*-------------------------------------------------------------------------*/ 764 765 /* ethtool methods; minidrivers may need to add some more, but 766 * they'll probably want to use this base set. 767 */ 768 769 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd) 770 { 771 struct usbnet *dev = netdev_priv(net); 772 773 if (!dev->mii.mdio_read) 774 return -EOPNOTSUPP; 775 776 return mii_ethtool_gset(&dev->mii, cmd); 777 } 778 EXPORT_SYMBOL_GPL(usbnet_get_settings); 779 780 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd) 781 { 782 struct usbnet *dev = netdev_priv(net); 783 int retval; 784 785 if (!dev->mii.mdio_write) 786 return -EOPNOTSUPP; 787 788 retval = mii_ethtool_sset(&dev->mii, cmd); 789 790 /* link speed/duplex might have changed */ 791 if (dev->driver_info->link_reset) 792 dev->driver_info->link_reset(dev); 793 794 return retval; 795 796 } 797 EXPORT_SYMBOL_GPL(usbnet_set_settings); 798 799 u32 usbnet_get_link (struct net_device *net) 800 { 801 struct usbnet *dev = netdev_priv(net); 802 803 /* If a check_connect is defined, return its result */ 804 if (dev->driver_info->check_connect) 805 return dev->driver_info->check_connect (dev) == 0; 806 807 /* if the device has mii operations, use those */ 808 if (dev->mii.mdio_read) 809 return mii_link_ok(&dev->mii); 810 811 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ 812 return ethtool_op_get_link(net); 813 } 814 EXPORT_SYMBOL_GPL(usbnet_get_link); 815 816 int usbnet_nway_reset(struct net_device *net) 817 { 818 struct usbnet *dev = netdev_priv(net); 819 820 if (!dev->mii.mdio_write) 821 return -EOPNOTSUPP; 822 823 return mii_nway_restart(&dev->mii); 824 } 825 EXPORT_SYMBOL_GPL(usbnet_nway_reset); 826 827 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) 828 { 829 struct usbnet *dev = netdev_priv(net); 830 831 strncpy (info->driver, dev->driver_name, sizeof info->driver); 832 strncpy (info->version, DRIVER_VERSION, sizeof info->version); 833 strncpy (info->fw_version, dev->driver_info->description, 834 sizeof info->fw_version); 835 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); 836 } 837 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); 838 839 u32 usbnet_get_msglevel (struct net_device *net) 840 { 841 struct usbnet *dev = netdev_priv(net); 842 843 return dev->msg_enable; 844 } 845 EXPORT_SYMBOL_GPL(usbnet_get_msglevel); 846 847 void usbnet_set_msglevel (struct net_device *net, u32 level) 848 { 849 struct usbnet *dev = netdev_priv(net); 850 851 dev->msg_enable = level; 852 } 853 EXPORT_SYMBOL_GPL(usbnet_set_msglevel); 854 855 /* drivers may override default ethtool_ops in their bind() routine */ 856 static const struct ethtool_ops usbnet_ethtool_ops = { 857 .get_settings = usbnet_get_settings, 858 .set_settings = usbnet_set_settings, 859 .get_link = usbnet_get_link, 860 .nway_reset = usbnet_nway_reset, 861 .get_drvinfo = usbnet_get_drvinfo, 862 .get_msglevel = usbnet_get_msglevel, 863 .set_msglevel = usbnet_set_msglevel, 864 }; 865 866 /*-------------------------------------------------------------------------*/ 867 868 /* work that cannot be done in interrupt context uses keventd. 869 * 870 * NOTE: with 2.5 we could do more of this using completion callbacks, 871 * especially now that control transfers can be queued. 872 */ 873 static void 874 kevent (struct work_struct *work) 875 { 876 struct usbnet *dev = 877 container_of(work, struct usbnet, kevent); 878 int status; 879 880 /* usb_clear_halt() needs a thread context */ 881 if (test_bit (EVENT_TX_HALT, &dev->flags)) { 882 unlink_urbs (dev, &dev->txq); 883 status = usb_autopm_get_interface(dev->intf); 884 if (status < 0) 885 goto fail_pipe; 886 status = usb_clear_halt (dev->udev, dev->out); 887 usb_autopm_put_interface(dev->intf); 888 if (status < 0 && 889 status != -EPIPE && 890 status != -ESHUTDOWN) { 891 if (netif_msg_tx_err (dev)) 892 fail_pipe: 893 netdev_err(dev->net, "can't clear tx halt, status %d\n", 894 status); 895 } else { 896 clear_bit (EVENT_TX_HALT, &dev->flags); 897 if (status != -ESHUTDOWN) 898 netif_wake_queue (dev->net); 899 } 900 } 901 if (test_bit (EVENT_RX_HALT, &dev->flags)) { 902 unlink_urbs (dev, &dev->rxq); 903 status = usb_autopm_get_interface(dev->intf); 904 if (status < 0) 905 goto fail_halt; 906 status = usb_clear_halt (dev->udev, dev->in); 907 usb_autopm_put_interface(dev->intf); 908 if (status < 0 && 909 status != -EPIPE && 910 status != -ESHUTDOWN) { 911 if (netif_msg_rx_err (dev)) 912 fail_halt: 913 netdev_err(dev->net, "can't clear rx halt, status %d\n", 914 status); 915 } else { 916 clear_bit (EVENT_RX_HALT, &dev->flags); 917 tasklet_schedule (&dev->bh); 918 } 919 } 920 921 /* tasklet could resubmit itself forever if memory is tight */ 922 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { 923 struct urb *urb = NULL; 924 925 if (netif_running (dev->net)) 926 urb = usb_alloc_urb (0, GFP_KERNEL); 927 else 928 clear_bit (EVENT_RX_MEMORY, &dev->flags); 929 if (urb != NULL) { 930 clear_bit (EVENT_RX_MEMORY, &dev->flags); 931 status = usb_autopm_get_interface(dev->intf); 932 if (status < 0) 933 goto fail_lowmem; 934 rx_submit (dev, urb, GFP_KERNEL); 935 usb_autopm_put_interface(dev->intf); 936 fail_lowmem: 937 tasklet_schedule (&dev->bh); 938 } 939 } 940 941 if (test_bit (EVENT_LINK_RESET, &dev->flags)) { 942 struct driver_info *info = dev->driver_info; 943 int retval = 0; 944 945 clear_bit (EVENT_LINK_RESET, &dev->flags); 946 status = usb_autopm_get_interface(dev->intf); 947 if (status < 0) 948 goto skip_reset; 949 if(info->link_reset && (retval = info->link_reset(dev)) < 0) { 950 usb_autopm_put_interface(dev->intf); 951 skip_reset: 952 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", 953 retval, 954 dev->udev->bus->bus_name, 955 dev->udev->devpath, 956 info->description); 957 } else { 958 usb_autopm_put_interface(dev->intf); 959 } 960 } 961 962 if (dev->flags) 963 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); 964 } 965 966 /*-------------------------------------------------------------------------*/ 967 968 static void tx_complete (struct urb *urb) 969 { 970 struct sk_buff *skb = (struct sk_buff *) urb->context; 971 struct skb_data *entry = (struct skb_data *) skb->cb; 972 struct usbnet *dev = entry->dev; 973 974 if (urb->status == 0) { 975 dev->net->stats.tx_packets++; 976 dev->net->stats.tx_bytes += entry->length; 977 } else { 978 dev->net->stats.tx_errors++; 979 980 switch (urb->status) { 981 case -EPIPE: 982 usbnet_defer_kevent (dev, EVENT_TX_HALT); 983 break; 984 985 /* software-driven interface shutdown */ 986 case -ECONNRESET: // async unlink 987 case -ESHUTDOWN: // hardware gone 988 break; 989 990 // like rx, tx gets controller i/o faults during khubd delays 991 // and so it uses the same throttling mechanism. 992 case -EPROTO: 993 case -ETIME: 994 case -EILSEQ: 995 usb_mark_last_busy(dev->udev); 996 if (!timer_pending (&dev->delay)) { 997 mod_timer (&dev->delay, 998 jiffies + THROTTLE_JIFFIES); 999 netif_dbg(dev, link, dev->net, 1000 "tx throttle %d\n", urb->status); 1001 } 1002 netif_stop_queue (dev->net); 1003 break; 1004 default: 1005 netif_dbg(dev, tx_err, dev->net, 1006 "tx err %d\n", entry->urb->status); 1007 break; 1008 } 1009 } 1010 1011 usb_autopm_put_interface_async(dev->intf); 1012 urb->dev = NULL; 1013 entry->state = tx_done; 1014 defer_bh(dev, skb, &dev->txq); 1015 } 1016 1017 /*-------------------------------------------------------------------------*/ 1018 1019 void usbnet_tx_timeout (struct net_device *net) 1020 { 1021 struct usbnet *dev = netdev_priv(net); 1022 1023 unlink_urbs (dev, &dev->txq); 1024 tasklet_schedule (&dev->bh); 1025 1026 // FIXME: device recovery -- reset? 1027 } 1028 EXPORT_SYMBOL_GPL(usbnet_tx_timeout); 1029 1030 /*-------------------------------------------------------------------------*/ 1031 1032 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, 1033 struct net_device *net) 1034 { 1035 struct usbnet *dev = netdev_priv(net); 1036 int length; 1037 struct urb *urb = NULL; 1038 struct skb_data *entry; 1039 struct driver_info *info = dev->driver_info; 1040 unsigned long flags; 1041 int retval; 1042 1043 // some devices want funky USB-level framing, for 1044 // win32 driver (usually) and/or hardware quirks 1045 if (info->tx_fixup) { 1046 skb = info->tx_fixup (dev, skb, GFP_ATOMIC); 1047 if (!skb) { 1048 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); 1049 goto drop; 1050 } 1051 } 1052 length = skb->len; 1053 1054 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { 1055 netif_dbg(dev, tx_err, dev->net, "no urb\n"); 1056 goto drop; 1057 } 1058 1059 entry = (struct skb_data *) skb->cb; 1060 entry->urb = urb; 1061 entry->dev = dev; 1062 entry->state = tx_start; 1063 entry->length = length; 1064 1065 usb_fill_bulk_urb (urb, dev->udev, dev->out, 1066 skb->data, skb->len, tx_complete, skb); 1067 1068 /* don't assume the hardware handles USB_ZERO_PACKET 1069 * NOTE: strictly conforming cdc-ether devices should expect 1070 * the ZLP here, but ignore the one-byte packet. 1071 */ 1072 if (length % dev->maxpacket == 0) { 1073 if (!(info->flags & FLAG_SEND_ZLP)) { 1074 urb->transfer_buffer_length++; 1075 if (skb_tailroom(skb)) { 1076 skb->data[skb->len] = 0; 1077 __skb_put(skb, 1); 1078 } 1079 } else 1080 urb->transfer_flags |= URB_ZERO_PACKET; 1081 } 1082 1083 spin_lock_irqsave(&dev->txq.lock, flags); 1084 retval = usb_autopm_get_interface_async(dev->intf); 1085 if (retval < 0) { 1086 spin_unlock_irqrestore(&dev->txq.lock, flags); 1087 goto drop; 1088 } 1089 1090 #ifdef CONFIG_PM 1091 /* if this triggers the device is still a sleep */ 1092 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { 1093 /* transmission will be done in resume */ 1094 usb_anchor_urb(urb, &dev->deferred); 1095 /* no use to process more packets */ 1096 netif_stop_queue(net); 1097 spin_unlock_irqrestore(&dev->txq.lock, flags); 1098 netdev_dbg(dev->net, "Delaying transmission for resumption\n"); 1099 goto deferred; 1100 } 1101 #endif 1102 1103 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { 1104 case -EPIPE: 1105 netif_stop_queue (net); 1106 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1107 usb_autopm_put_interface_async(dev->intf); 1108 break; 1109 default: 1110 usb_autopm_put_interface_async(dev->intf); 1111 netif_dbg(dev, tx_err, dev->net, 1112 "tx: submit urb err %d\n", retval); 1113 break; 1114 case 0: 1115 net->trans_start = jiffies; 1116 __skb_queue_tail (&dev->txq, skb); 1117 if (dev->txq.qlen >= TX_QLEN (dev)) 1118 netif_stop_queue (net); 1119 } 1120 spin_unlock_irqrestore (&dev->txq.lock, flags); 1121 1122 if (retval) { 1123 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); 1124 drop: 1125 dev->net->stats.tx_dropped++; 1126 if (skb) 1127 dev_kfree_skb_any (skb); 1128 usb_free_urb (urb); 1129 } else 1130 netif_dbg(dev, tx_queued, dev->net, 1131 "> tx, len %d, type 0x%x\n", length, skb->protocol); 1132 #ifdef CONFIG_PM 1133 deferred: 1134 #endif 1135 return NETDEV_TX_OK; 1136 } 1137 EXPORT_SYMBOL_GPL(usbnet_start_xmit); 1138 1139 /*-------------------------------------------------------------------------*/ 1140 1141 // tasklet (work deferred from completions, in_irq) or timer 1142 1143 static void usbnet_bh (unsigned long param) 1144 { 1145 struct usbnet *dev = (struct usbnet *) param; 1146 struct sk_buff *skb; 1147 struct skb_data *entry; 1148 1149 while ((skb = skb_dequeue (&dev->done))) { 1150 entry = (struct skb_data *) skb->cb; 1151 switch (entry->state) { 1152 case rx_done: 1153 entry->state = rx_cleanup; 1154 rx_process (dev, skb); 1155 continue; 1156 case tx_done: 1157 case rx_cleanup: 1158 usb_free_urb (entry->urb); 1159 dev_kfree_skb (skb); 1160 continue; 1161 default: 1162 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); 1163 } 1164 } 1165 1166 // waiting for all pending urbs to complete? 1167 if (dev->wait) { 1168 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) { 1169 wake_up (dev->wait); 1170 } 1171 1172 // or are we maybe short a few urbs? 1173 } else if (netif_running (dev->net) && 1174 netif_device_present (dev->net) && 1175 !timer_pending (&dev->delay) && 1176 !test_bit (EVENT_RX_HALT, &dev->flags)) { 1177 int temp = dev->rxq.qlen; 1178 int qlen = RX_QLEN (dev); 1179 1180 if (temp < qlen) { 1181 struct urb *urb; 1182 int i; 1183 1184 // don't refill the queue all at once 1185 for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) { 1186 urb = usb_alloc_urb (0, GFP_ATOMIC); 1187 if (urb != NULL) 1188 rx_submit (dev, urb, GFP_ATOMIC); 1189 } 1190 if (temp != dev->rxq.qlen) 1191 netif_dbg(dev, link, dev->net, 1192 "rxqlen %d --> %d\n", 1193 temp, dev->rxq.qlen); 1194 if (dev->rxq.qlen < qlen) 1195 tasklet_schedule (&dev->bh); 1196 } 1197 if (dev->txq.qlen < TX_QLEN (dev)) 1198 netif_wake_queue (dev->net); 1199 } 1200 } 1201 1202 1203 /*------------------------------------------------------------------------- 1204 * 1205 * USB Device Driver support 1206 * 1207 *-------------------------------------------------------------------------*/ 1208 1209 // precondition: never called in_interrupt 1210 1211 void usbnet_disconnect (struct usb_interface *intf) 1212 { 1213 struct usbnet *dev; 1214 struct usb_device *xdev; 1215 struct net_device *net; 1216 1217 dev = usb_get_intfdata(intf); 1218 usb_set_intfdata(intf, NULL); 1219 if (!dev) 1220 return; 1221 1222 xdev = interface_to_usbdev (intf); 1223 1224 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", 1225 intf->dev.driver->name, 1226 xdev->bus->bus_name, xdev->devpath, 1227 dev->driver_info->description); 1228 1229 net = dev->net; 1230 unregister_netdev (net); 1231 1232 /* we don't hold rtnl here ... */ 1233 flush_scheduled_work (); 1234 1235 if (dev->driver_info->unbind) 1236 dev->driver_info->unbind (dev, intf); 1237 1238 free_netdev(net); 1239 usb_put_dev (xdev); 1240 } 1241 EXPORT_SYMBOL_GPL(usbnet_disconnect); 1242 1243 static const struct net_device_ops usbnet_netdev_ops = { 1244 .ndo_open = usbnet_open, 1245 .ndo_stop = usbnet_stop, 1246 .ndo_start_xmit = usbnet_start_xmit, 1247 .ndo_tx_timeout = usbnet_tx_timeout, 1248 .ndo_change_mtu = usbnet_change_mtu, 1249 .ndo_set_mac_address = eth_mac_addr, 1250 .ndo_validate_addr = eth_validate_addr, 1251 }; 1252 1253 /*-------------------------------------------------------------------------*/ 1254 1255 // precondition: never called in_interrupt 1256 1257 static struct device_type wlan_type = { 1258 .name = "wlan", 1259 }; 1260 1261 static struct device_type wwan_type = { 1262 .name = "wwan", 1263 }; 1264 1265 int 1266 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) 1267 { 1268 struct usbnet *dev; 1269 struct net_device *net; 1270 struct usb_host_interface *interface; 1271 struct driver_info *info; 1272 struct usb_device *xdev; 1273 int status; 1274 const char *name; 1275 1276 name = udev->dev.driver->name; 1277 info = (struct driver_info *) prod->driver_info; 1278 if (!info) { 1279 dev_dbg (&udev->dev, "blacklisted by %s\n", name); 1280 return -ENODEV; 1281 } 1282 xdev = interface_to_usbdev (udev); 1283 interface = udev->cur_altsetting; 1284 1285 usb_get_dev (xdev); 1286 1287 status = -ENOMEM; 1288 1289 // set up our own records 1290 net = alloc_etherdev(sizeof(*dev)); 1291 if (!net) { 1292 dbg ("can't kmalloc dev"); 1293 goto out; 1294 } 1295 1296 dev = netdev_priv(net); 1297 dev->udev = xdev; 1298 dev->intf = udev; 1299 dev->driver_info = info; 1300 dev->driver_name = name; 1301 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV 1302 | NETIF_MSG_PROBE | NETIF_MSG_LINK); 1303 skb_queue_head_init (&dev->rxq); 1304 skb_queue_head_init (&dev->txq); 1305 skb_queue_head_init (&dev->done); 1306 skb_queue_head_init(&dev->rxq_pause); 1307 dev->bh.func = usbnet_bh; 1308 dev->bh.data = (unsigned long) dev; 1309 INIT_WORK (&dev->kevent, kevent); 1310 init_usb_anchor(&dev->deferred); 1311 dev->delay.function = usbnet_bh; 1312 dev->delay.data = (unsigned long) dev; 1313 init_timer (&dev->delay); 1314 mutex_init (&dev->phy_mutex); 1315 1316 dev->net = net; 1317 strcpy (net->name, "usb%d"); 1318 memcpy (net->dev_addr, node_id, sizeof node_id); 1319 1320 /* rx and tx sides can use different message sizes; 1321 * bind() should set rx_urb_size in that case. 1322 */ 1323 dev->hard_mtu = net->mtu + net->hard_header_len; 1324 #if 0 1325 // dma_supported() is deeply broken on almost all architectures 1326 // possible with some EHCI controllers 1327 if (dma_supported (&udev->dev, DMA_BIT_MASK(64))) 1328 net->features |= NETIF_F_HIGHDMA; 1329 #endif 1330 1331 net->netdev_ops = &usbnet_netdev_ops; 1332 net->watchdog_timeo = TX_TIMEOUT_JIFFIES; 1333 net->ethtool_ops = &usbnet_ethtool_ops; 1334 1335 // allow device-specific bind/init procedures 1336 // NOTE net->name still not usable ... 1337 if (info->bind) { 1338 status = info->bind (dev, udev); 1339 if (status < 0) 1340 goto out1; 1341 1342 // heuristic: "usb%d" for links we know are two-host, 1343 // else "eth%d" when there's reasonable doubt. userspace 1344 // can rename the link if it knows better. 1345 if ((dev->driver_info->flags & FLAG_ETHER) != 0 && 1346 (net->dev_addr [0] & 0x02) == 0) 1347 strcpy (net->name, "eth%d"); 1348 /* WLAN devices should always be named "wlan%d" */ 1349 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1350 strcpy(net->name, "wlan%d"); 1351 /* WWAN devices should always be named "wwan%d" */ 1352 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1353 strcpy(net->name, "wwan%d"); 1354 1355 /* maybe the remote can't receive an Ethernet MTU */ 1356 if (net->mtu > (dev->hard_mtu - net->hard_header_len)) 1357 net->mtu = dev->hard_mtu - net->hard_header_len; 1358 } else if (!info->in || !info->out) 1359 status = usbnet_get_endpoints (dev, udev); 1360 else { 1361 dev->in = usb_rcvbulkpipe (xdev, info->in); 1362 dev->out = usb_sndbulkpipe (xdev, info->out); 1363 if (!(info->flags & FLAG_NO_SETINT)) 1364 status = usb_set_interface (xdev, 1365 interface->desc.bInterfaceNumber, 1366 interface->desc.bAlternateSetting); 1367 else 1368 status = 0; 1369 1370 } 1371 if (status >= 0 && dev->status) 1372 status = init_status (dev, udev); 1373 if (status < 0) 1374 goto out3; 1375 1376 if (!dev->rx_urb_size) 1377 dev->rx_urb_size = dev->hard_mtu; 1378 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); 1379 1380 SET_NETDEV_DEV(net, &udev->dev); 1381 1382 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1383 SET_NETDEV_DEVTYPE(net, &wlan_type); 1384 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1385 SET_NETDEV_DEVTYPE(net, &wwan_type); 1386 1387 status = register_netdev (net); 1388 if (status) 1389 goto out3; 1390 netif_info(dev, probe, dev->net, 1391 "register '%s' at usb-%s-%s, %s, %pM\n", 1392 udev->dev.driver->name, 1393 xdev->bus->bus_name, xdev->devpath, 1394 dev->driver_info->description, 1395 net->dev_addr); 1396 1397 // ok, it's ready to go. 1398 usb_set_intfdata (udev, dev); 1399 1400 netif_device_attach (net); 1401 1402 if (dev->driver_info->flags & FLAG_LINK_INTR) 1403 netif_carrier_off(net); 1404 1405 return 0; 1406 1407 out3: 1408 if (info->unbind) 1409 info->unbind (dev, udev); 1410 out1: 1411 free_netdev(net); 1412 out: 1413 usb_put_dev(xdev); 1414 return status; 1415 } 1416 EXPORT_SYMBOL_GPL(usbnet_probe); 1417 1418 /*-------------------------------------------------------------------------*/ 1419 1420 /* 1421 * suspend the whole driver as soon as the first interface is suspended 1422 * resume only when the last interface is resumed 1423 */ 1424 1425 int usbnet_suspend (struct usb_interface *intf, pm_message_t message) 1426 { 1427 struct usbnet *dev = usb_get_intfdata(intf); 1428 1429 if (!dev->suspend_count++) { 1430 spin_lock_irq(&dev->txq.lock); 1431 /* don't autosuspend while transmitting */ 1432 if (dev->txq.qlen && (message.event & PM_EVENT_AUTO)) { 1433 spin_unlock_irq(&dev->txq.lock); 1434 return -EBUSY; 1435 } else { 1436 set_bit(EVENT_DEV_ASLEEP, &dev->flags); 1437 spin_unlock_irq(&dev->txq.lock); 1438 } 1439 /* 1440 * accelerate emptying of the rx and queues, to avoid 1441 * having everything error out. 1442 */ 1443 netif_device_detach (dev->net); 1444 usbnet_terminate_urbs(dev); 1445 usb_kill_urb(dev->interrupt); 1446 1447 /* 1448 * reattach so runtime management can use and 1449 * wake the device 1450 */ 1451 netif_device_attach (dev->net); 1452 } 1453 return 0; 1454 } 1455 EXPORT_SYMBOL_GPL(usbnet_suspend); 1456 1457 int usbnet_resume (struct usb_interface *intf) 1458 { 1459 struct usbnet *dev = usb_get_intfdata(intf); 1460 struct sk_buff *skb; 1461 struct urb *res; 1462 int retval; 1463 1464 if (!--dev->suspend_count) { 1465 spin_lock_irq(&dev->txq.lock); 1466 while ((res = usb_get_from_anchor(&dev->deferred))) { 1467 1468 printk(KERN_INFO"%s has delayed data\n", __func__); 1469 skb = (struct sk_buff *)res->context; 1470 retval = usb_submit_urb(res, GFP_ATOMIC); 1471 if (retval < 0) { 1472 dev_kfree_skb_any(skb); 1473 usb_free_urb(res); 1474 usb_autopm_put_interface_async(dev->intf); 1475 } else { 1476 dev->net->trans_start = jiffies; 1477 __skb_queue_tail(&dev->txq, skb); 1478 } 1479 } 1480 1481 smp_mb(); 1482 clear_bit(EVENT_DEV_ASLEEP, &dev->flags); 1483 spin_unlock_irq(&dev->txq.lock); 1484 if (!(dev->txq.qlen >= TX_QLEN(dev))) 1485 netif_start_queue(dev->net); 1486 tasklet_schedule (&dev->bh); 1487 } 1488 return 0; 1489 } 1490 EXPORT_SYMBOL_GPL(usbnet_resume); 1491 1492 1493 /*-------------------------------------------------------------------------*/ 1494 1495 static int __init usbnet_init(void) 1496 { 1497 /* compiler should optimize this out */ 1498 BUILD_BUG_ON (sizeof (((struct sk_buff *)0)->cb) 1499 < sizeof (struct skb_data)); 1500 1501 random_ether_addr(node_id); 1502 return 0; 1503 } 1504 module_init(usbnet_init); 1505 1506 static void __exit usbnet_exit(void) 1507 { 1508 } 1509 module_exit(usbnet_exit); 1510 1511 MODULE_AUTHOR("David Brownell"); 1512 MODULE_DESCRIPTION("USB network driver framework"); 1513 MODULE_LICENSE("GPL"); 1514