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 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n", 246 skb->len + sizeof (struct ethhdr), skb->protocol); 247 memset (skb->cb, 0, sizeof (struct skb_data)); 248 status = netif_rx (skb); 249 if (status != NET_RX_SUCCESS) 250 netif_dbg(dev, rx_err, dev->net, 251 "netif_rx status %d\n", 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 netdev_err(dev->net, "kevent %d may have been dropped\n", work); 317 else 318 netdev_dbg(dev->net, "kevent %d scheduled\n", 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 netif_dbg(dev, rx_err, dev->net, "no rx skb\n"); 336 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 337 usb_free_urb (urb); 338 return; 339 } 340 skb_reserve (skb, NET_IP_ALIGN); 341 342 entry = (struct skb_data *) skb->cb; 343 entry->urb = urb; 344 entry->dev = dev; 345 entry->state = rx_start; 346 entry->length = 0; 347 348 usb_fill_bulk_urb (urb, dev->udev, dev->in, 349 skb->data, size, rx_complete, skb); 350 351 spin_lock_irqsave (&dev->rxq.lock, lockflags); 352 353 if (netif_running (dev->net) && 354 netif_device_present (dev->net) && 355 !test_bit (EVENT_RX_HALT, &dev->flags) && 356 !test_bit (EVENT_DEV_ASLEEP, &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 netif_dbg(dev, ifdown, dev->net, "device gone\n"); 366 netif_device_detach (dev->net); 367 break; 368 default: 369 netif_dbg(dev, rx_err, dev->net, 370 "rx submit, %d\n", retval); 371 tasklet_schedule (&dev->bh); 372 break; 373 case 0: 374 __skb_queue_tail (&dev->rxq, skb); 375 } 376 } else { 377 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n"); 378 retval = -ENOLINK; 379 } 380 spin_unlock_irqrestore (&dev->rxq.lock, lockflags); 381 if (retval) { 382 dev_kfree_skb_any (skb); 383 usb_free_urb (urb); 384 } 385 } 386 387 388 /*-------------------------------------------------------------------------*/ 389 390 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb) 391 { 392 if (dev->driver_info->rx_fixup && 393 !dev->driver_info->rx_fixup (dev, skb)) 394 goto error; 395 // else network stack removes extra byte if we forced a short packet 396 397 if (skb->len) 398 usbnet_skb_return (dev, skb); 399 else { 400 netif_dbg(dev, rx_err, dev->net, "drop\n"); 401 error: 402 dev->net->stats.rx_errors++; 403 skb_queue_tail (&dev->done, skb); 404 } 405 } 406 407 /*-------------------------------------------------------------------------*/ 408 409 static void rx_complete (struct urb *urb) 410 { 411 struct sk_buff *skb = (struct sk_buff *) urb->context; 412 struct skb_data *entry = (struct skb_data *) skb->cb; 413 struct usbnet *dev = entry->dev; 414 int urb_status = urb->status; 415 416 skb_put (skb, urb->actual_length); 417 entry->state = rx_done; 418 entry->urb = NULL; 419 420 switch (urb_status) { 421 /* success */ 422 case 0: 423 if (skb->len < dev->net->hard_header_len) { 424 entry->state = rx_cleanup; 425 dev->net->stats.rx_errors++; 426 dev->net->stats.rx_length_errors++; 427 netif_dbg(dev, rx_err, dev->net, 428 "rx length %d\n", skb->len); 429 } 430 break; 431 432 /* stalls need manual reset. this is rare ... except that 433 * when going through USB 2.0 TTs, unplug appears this way. 434 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ 435 * storm, recovering as needed. 436 */ 437 case -EPIPE: 438 dev->net->stats.rx_errors++; 439 usbnet_defer_kevent (dev, EVENT_RX_HALT); 440 // FALLTHROUGH 441 442 /* software-driven interface shutdown */ 443 case -ECONNRESET: /* async unlink */ 444 case -ESHUTDOWN: /* hardware gone */ 445 netif_dbg(dev, ifdown, dev->net, 446 "rx shutdown, code %d\n", urb_status); 447 goto block; 448 449 /* we get controller i/o faults during khubd disconnect() delays. 450 * throttle down resubmits, to avoid log floods; just temporarily, 451 * so we still recover when the fault isn't a khubd delay. 452 */ 453 case -EPROTO: 454 case -ETIME: 455 case -EILSEQ: 456 dev->net->stats.rx_errors++; 457 if (!timer_pending (&dev->delay)) { 458 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); 459 netif_dbg(dev, link, dev->net, 460 "rx throttle %d\n", urb_status); 461 } 462 block: 463 entry->state = rx_cleanup; 464 entry->urb = urb; 465 urb = NULL; 466 break; 467 468 /* data overrun ... flush fifo? */ 469 case -EOVERFLOW: 470 dev->net->stats.rx_over_errors++; 471 // FALLTHROUGH 472 473 default: 474 entry->state = rx_cleanup; 475 dev->net->stats.rx_errors++; 476 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status); 477 break; 478 } 479 480 defer_bh(dev, skb, &dev->rxq); 481 482 if (urb) { 483 if (netif_running (dev->net) && 484 !test_bit (EVENT_RX_HALT, &dev->flags)) { 485 rx_submit (dev, urb, GFP_ATOMIC); 486 return; 487 } 488 usb_free_urb (urb); 489 } 490 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n"); 491 } 492 493 static void intr_complete (struct urb *urb) 494 { 495 struct usbnet *dev = urb->context; 496 int status = urb->status; 497 498 switch (status) { 499 /* success */ 500 case 0: 501 dev->driver_info->status(dev, urb); 502 break; 503 504 /* software-driven interface shutdown */ 505 case -ENOENT: /* urb killed */ 506 case -ESHUTDOWN: /* hardware gone */ 507 netif_dbg(dev, ifdown, dev->net, 508 "intr shutdown, code %d\n", status); 509 return; 510 511 /* NOTE: not throttling like RX/TX, since this endpoint 512 * already polls infrequently 513 */ 514 default: 515 netdev_dbg(dev->net, "intr status %d\n", status); 516 break; 517 } 518 519 if (!netif_running (dev->net)) 520 return; 521 522 memset(urb->transfer_buffer, 0, urb->transfer_buffer_length); 523 status = usb_submit_urb (urb, GFP_ATOMIC); 524 if (status != 0) 525 netif_err(dev, timer, dev->net, 526 "intr resubmit --> %d\n", status); 527 } 528 529 /*-------------------------------------------------------------------------*/ 530 void usbnet_pause_rx(struct usbnet *dev) 531 { 532 set_bit(EVENT_RX_PAUSED, &dev->flags); 533 534 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n"); 535 } 536 EXPORT_SYMBOL_GPL(usbnet_pause_rx); 537 538 void usbnet_resume_rx(struct usbnet *dev) 539 { 540 struct sk_buff *skb; 541 int num = 0; 542 543 clear_bit(EVENT_RX_PAUSED, &dev->flags); 544 545 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) { 546 usbnet_skb_return(dev, skb); 547 num++; 548 } 549 550 tasklet_schedule(&dev->bh); 551 552 netif_dbg(dev, rx_status, dev->net, 553 "paused rx queue disabled, %d skbs requeued\n", num); 554 } 555 EXPORT_SYMBOL_GPL(usbnet_resume_rx); 556 557 void usbnet_purge_paused_rxq(struct usbnet *dev) 558 { 559 skb_queue_purge(&dev->rxq_pause); 560 } 561 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq); 562 563 /*-------------------------------------------------------------------------*/ 564 565 // unlink pending rx/tx; completion handlers do all other cleanup 566 567 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) 568 { 569 unsigned long flags; 570 struct sk_buff *skb, *skbnext; 571 int count = 0; 572 573 spin_lock_irqsave (&q->lock, flags); 574 skb_queue_walk_safe(q, skb, skbnext) { 575 struct skb_data *entry; 576 struct urb *urb; 577 int retval; 578 579 entry = (struct skb_data *) skb->cb; 580 urb = entry->urb; 581 582 // during some PM-driven resume scenarios, 583 // these (async) unlinks complete immediately 584 retval = usb_unlink_urb (urb); 585 if (retval != -EINPROGRESS && retval != 0) 586 netdev_dbg(dev->net, "unlink urb err, %d\n", retval); 587 else 588 count++; 589 } 590 spin_unlock_irqrestore (&q->lock, flags); 591 return count; 592 } 593 594 // Flush all pending rx urbs 595 // minidrivers may need to do this when the MTU changes 596 597 void usbnet_unlink_rx_urbs(struct usbnet *dev) 598 { 599 if (netif_running(dev->net)) { 600 (void) unlink_urbs (dev, &dev->rxq); 601 tasklet_schedule(&dev->bh); 602 } 603 } 604 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); 605 606 /*-------------------------------------------------------------------------*/ 607 608 // precondition: never called in_interrupt 609 static void usbnet_terminate_urbs(struct usbnet *dev) 610 { 611 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup); 612 DECLARE_WAITQUEUE(wait, current); 613 int temp; 614 615 /* ensure there are no more active urbs */ 616 add_wait_queue(&unlink_wakeup, &wait); 617 set_current_state(TASK_UNINTERRUPTIBLE); 618 dev->wait = &unlink_wakeup; 619 temp = unlink_urbs(dev, &dev->txq) + 620 unlink_urbs(dev, &dev->rxq); 621 622 /* maybe wait for deletions to finish. */ 623 while (!skb_queue_empty(&dev->rxq) 624 && !skb_queue_empty(&dev->txq) 625 && !skb_queue_empty(&dev->done)) { 626 schedule_timeout(UNLINK_TIMEOUT_MS); 627 set_current_state(TASK_UNINTERRUPTIBLE); 628 netif_dbg(dev, ifdown, dev->net, 629 "waited for %d urb completions\n", temp); 630 } 631 set_current_state(TASK_RUNNING); 632 dev->wait = NULL; 633 remove_wait_queue(&unlink_wakeup, &wait); 634 } 635 636 int usbnet_stop (struct net_device *net) 637 { 638 struct usbnet *dev = netdev_priv(net); 639 struct driver_info *info = dev->driver_info; 640 int retval; 641 642 netif_stop_queue (net); 643 644 netif_info(dev, ifdown, dev->net, 645 "stop stats: rx/tx %ld/%ld, errs %ld/%ld\n", 646 net->stats.rx_packets, net->stats.tx_packets, 647 net->stats.rx_errors, net->stats.tx_errors); 648 649 /* allow minidriver to stop correctly (wireless devices to turn off 650 * radio etc) */ 651 if (info->stop) { 652 retval = info->stop(dev); 653 if (retval < 0) 654 netif_info(dev, ifdown, dev->net, 655 "stop fail (%d) usbnet usb-%s-%s, %s\n", 656 retval, 657 dev->udev->bus->bus_name, dev->udev->devpath, 658 info->description); 659 } 660 661 if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) 662 usbnet_terminate_urbs(dev); 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 if (info->manage_power) 676 info->manage_power(dev, 0); 677 else 678 usb_autopm_put_interface(dev->intf); 679 680 return 0; 681 } 682 EXPORT_SYMBOL_GPL(usbnet_stop); 683 684 /*-------------------------------------------------------------------------*/ 685 686 // posts reads, and enables write queuing 687 688 // precondition: never called in_interrupt 689 690 int usbnet_open (struct net_device *net) 691 { 692 struct usbnet *dev = netdev_priv(net); 693 int retval; 694 struct driver_info *info = dev->driver_info; 695 696 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { 697 netif_info(dev, ifup, dev->net, 698 "resumption fail (%d) usbnet usb-%s-%s, %s\n", 699 retval, 700 dev->udev->bus->bus_name, 701 dev->udev->devpath, 702 info->description); 703 goto done_nopm; 704 } 705 706 // put into "known safe" state 707 if (info->reset && (retval = info->reset (dev)) < 0) { 708 netif_info(dev, ifup, dev->net, 709 "open reset fail (%d) usbnet usb-%s-%s, %s\n", 710 retval, 711 dev->udev->bus->bus_name, 712 dev->udev->devpath, 713 info->description); 714 goto done; 715 } 716 717 // insist peer be connected 718 if (info->check_connect && (retval = info->check_connect (dev)) < 0) { 719 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval); 720 goto done; 721 } 722 723 /* start any status interrupt transfer */ 724 if (dev->interrupt) { 725 retval = usb_submit_urb (dev->interrupt, GFP_KERNEL); 726 if (retval < 0) { 727 netif_err(dev, ifup, dev->net, 728 "intr submit %d\n", retval); 729 goto done; 730 } 731 } 732 733 netif_start_queue (net); 734 netif_info(dev, ifup, dev->net, 735 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n", 736 (int)RX_QLEN(dev), (int)TX_QLEN(dev), 737 dev->net->mtu, 738 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" : 739 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" : 740 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" : 741 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" : 742 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" : 743 "simple"); 744 745 // delay posting reads until we're fully open 746 tasklet_schedule (&dev->bh); 747 if (info->manage_power) { 748 retval = info->manage_power(dev, 1); 749 if (retval < 0) 750 goto done; 751 usb_autopm_put_interface(dev->intf); 752 } 753 return retval; 754 755 done: 756 usb_autopm_put_interface(dev->intf); 757 done_nopm: 758 return retval; 759 } 760 EXPORT_SYMBOL_GPL(usbnet_open); 761 762 /*-------------------------------------------------------------------------*/ 763 764 /* ethtool methods; minidrivers may need to add some more, but 765 * they'll probably want to use this base set. 766 */ 767 768 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd) 769 { 770 struct usbnet *dev = netdev_priv(net); 771 772 if (!dev->mii.mdio_read) 773 return -EOPNOTSUPP; 774 775 return mii_ethtool_gset(&dev->mii, cmd); 776 } 777 EXPORT_SYMBOL_GPL(usbnet_get_settings); 778 779 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd) 780 { 781 struct usbnet *dev = netdev_priv(net); 782 int retval; 783 784 if (!dev->mii.mdio_write) 785 return -EOPNOTSUPP; 786 787 retval = mii_ethtool_sset(&dev->mii, cmd); 788 789 /* link speed/duplex might have changed */ 790 if (dev->driver_info->link_reset) 791 dev->driver_info->link_reset(dev); 792 793 return retval; 794 795 } 796 EXPORT_SYMBOL_GPL(usbnet_set_settings); 797 798 u32 usbnet_get_link (struct net_device *net) 799 { 800 struct usbnet *dev = netdev_priv(net); 801 802 /* If a check_connect is defined, return its result */ 803 if (dev->driver_info->check_connect) 804 return dev->driver_info->check_connect (dev) == 0; 805 806 /* if the device has mii operations, use those */ 807 if (dev->mii.mdio_read) 808 return mii_link_ok(&dev->mii); 809 810 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ 811 return ethtool_op_get_link(net); 812 } 813 EXPORT_SYMBOL_GPL(usbnet_get_link); 814 815 int usbnet_nway_reset(struct net_device *net) 816 { 817 struct usbnet *dev = netdev_priv(net); 818 819 if (!dev->mii.mdio_write) 820 return -EOPNOTSUPP; 821 822 return mii_nway_restart(&dev->mii); 823 } 824 EXPORT_SYMBOL_GPL(usbnet_nway_reset); 825 826 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) 827 { 828 struct usbnet *dev = netdev_priv(net); 829 830 strncpy (info->driver, dev->driver_name, sizeof info->driver); 831 strncpy (info->version, DRIVER_VERSION, sizeof info->version); 832 strncpy (info->fw_version, dev->driver_info->description, 833 sizeof info->fw_version); 834 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); 835 } 836 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); 837 838 u32 usbnet_get_msglevel (struct net_device *net) 839 { 840 struct usbnet *dev = netdev_priv(net); 841 842 return dev->msg_enable; 843 } 844 EXPORT_SYMBOL_GPL(usbnet_get_msglevel); 845 846 void usbnet_set_msglevel (struct net_device *net, u32 level) 847 { 848 struct usbnet *dev = netdev_priv(net); 849 850 dev->msg_enable = level; 851 } 852 EXPORT_SYMBOL_GPL(usbnet_set_msglevel); 853 854 /* drivers may override default ethtool_ops in their bind() routine */ 855 static const struct ethtool_ops usbnet_ethtool_ops = { 856 .get_settings = usbnet_get_settings, 857 .set_settings = usbnet_set_settings, 858 .get_link = usbnet_get_link, 859 .nway_reset = usbnet_nway_reset, 860 .get_drvinfo = usbnet_get_drvinfo, 861 .get_msglevel = usbnet_get_msglevel, 862 .set_msglevel = usbnet_set_msglevel, 863 }; 864 865 /*-------------------------------------------------------------------------*/ 866 867 /* work that cannot be done in interrupt context uses keventd. 868 * 869 * NOTE: with 2.5 we could do more of this using completion callbacks, 870 * especially now that control transfers can be queued. 871 */ 872 static void 873 kevent (struct work_struct *work) 874 { 875 struct usbnet *dev = 876 container_of(work, struct usbnet, kevent); 877 int status; 878 879 /* usb_clear_halt() needs a thread context */ 880 if (test_bit (EVENT_TX_HALT, &dev->flags)) { 881 unlink_urbs (dev, &dev->txq); 882 status = usb_autopm_get_interface(dev->intf); 883 if (status < 0) 884 goto fail_pipe; 885 status = usb_clear_halt (dev->udev, dev->out); 886 usb_autopm_put_interface(dev->intf); 887 if (status < 0 && 888 status != -EPIPE && 889 status != -ESHUTDOWN) { 890 if (netif_msg_tx_err (dev)) 891 fail_pipe: 892 netdev_err(dev->net, "can't clear tx halt, status %d\n", 893 status); 894 } else { 895 clear_bit (EVENT_TX_HALT, &dev->flags); 896 if (status != -ESHUTDOWN) 897 netif_wake_queue (dev->net); 898 } 899 } 900 if (test_bit (EVENT_RX_HALT, &dev->flags)) { 901 unlink_urbs (dev, &dev->rxq); 902 status = usb_autopm_get_interface(dev->intf); 903 if (status < 0) 904 goto fail_halt; 905 status = usb_clear_halt (dev->udev, dev->in); 906 usb_autopm_put_interface(dev->intf); 907 if (status < 0 && 908 status != -EPIPE && 909 status != -ESHUTDOWN) { 910 if (netif_msg_rx_err (dev)) 911 fail_halt: 912 netdev_err(dev->net, "can't clear rx halt, status %d\n", 913 status); 914 } else { 915 clear_bit (EVENT_RX_HALT, &dev->flags); 916 tasklet_schedule (&dev->bh); 917 } 918 } 919 920 /* tasklet could resubmit itself forever if memory is tight */ 921 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { 922 struct urb *urb = NULL; 923 924 if (netif_running (dev->net)) 925 urb = usb_alloc_urb (0, GFP_KERNEL); 926 else 927 clear_bit (EVENT_RX_MEMORY, &dev->flags); 928 if (urb != NULL) { 929 clear_bit (EVENT_RX_MEMORY, &dev->flags); 930 status = usb_autopm_get_interface(dev->intf); 931 if (status < 0) 932 goto fail_lowmem; 933 rx_submit (dev, urb, GFP_KERNEL); 934 usb_autopm_put_interface(dev->intf); 935 fail_lowmem: 936 tasklet_schedule (&dev->bh); 937 } 938 } 939 940 if (test_bit (EVENT_LINK_RESET, &dev->flags)) { 941 struct driver_info *info = dev->driver_info; 942 int retval = 0; 943 944 clear_bit (EVENT_LINK_RESET, &dev->flags); 945 status = usb_autopm_get_interface(dev->intf); 946 if (status < 0) 947 goto skip_reset; 948 if(info->link_reset && (retval = info->link_reset(dev)) < 0) { 949 usb_autopm_put_interface(dev->intf); 950 skip_reset: 951 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", 952 retval, 953 dev->udev->bus->bus_name, 954 dev->udev->devpath, 955 info->description); 956 } else { 957 usb_autopm_put_interface(dev->intf); 958 } 959 } 960 961 if (dev->flags) 962 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); 963 } 964 965 /*-------------------------------------------------------------------------*/ 966 967 static void tx_complete (struct urb *urb) 968 { 969 struct sk_buff *skb = (struct sk_buff *) urb->context; 970 struct skb_data *entry = (struct skb_data *) skb->cb; 971 struct usbnet *dev = entry->dev; 972 973 if (urb->status == 0) { 974 dev->net->stats.tx_packets++; 975 dev->net->stats.tx_bytes += entry->length; 976 } else { 977 dev->net->stats.tx_errors++; 978 979 switch (urb->status) { 980 case -EPIPE: 981 usbnet_defer_kevent (dev, EVENT_TX_HALT); 982 break; 983 984 /* software-driven interface shutdown */ 985 case -ECONNRESET: // async unlink 986 case -ESHUTDOWN: // hardware gone 987 break; 988 989 // like rx, tx gets controller i/o faults during khubd delays 990 // and so it uses the same throttling mechanism. 991 case -EPROTO: 992 case -ETIME: 993 case -EILSEQ: 994 usb_mark_last_busy(dev->udev); 995 if (!timer_pending (&dev->delay)) { 996 mod_timer (&dev->delay, 997 jiffies + THROTTLE_JIFFIES); 998 netif_dbg(dev, link, dev->net, 999 "tx throttle %d\n", urb->status); 1000 } 1001 netif_stop_queue (dev->net); 1002 break; 1003 default: 1004 netif_dbg(dev, tx_err, dev->net, 1005 "tx err %d\n", entry->urb->status); 1006 break; 1007 } 1008 } 1009 1010 usb_autopm_put_interface_async(dev->intf); 1011 urb->dev = NULL; 1012 entry->state = tx_done; 1013 defer_bh(dev, skb, &dev->txq); 1014 } 1015 1016 /*-------------------------------------------------------------------------*/ 1017 1018 void usbnet_tx_timeout (struct net_device *net) 1019 { 1020 struct usbnet *dev = netdev_priv(net); 1021 1022 unlink_urbs (dev, &dev->txq); 1023 tasklet_schedule (&dev->bh); 1024 1025 // FIXME: device recovery -- reset? 1026 } 1027 EXPORT_SYMBOL_GPL(usbnet_tx_timeout); 1028 1029 /*-------------------------------------------------------------------------*/ 1030 1031 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, 1032 struct net_device *net) 1033 { 1034 struct usbnet *dev = netdev_priv(net); 1035 int length; 1036 struct urb *urb = NULL; 1037 struct skb_data *entry; 1038 struct driver_info *info = dev->driver_info; 1039 unsigned long flags; 1040 int retval; 1041 1042 // some devices want funky USB-level framing, for 1043 // win32 driver (usually) and/or hardware quirks 1044 if (info->tx_fixup) { 1045 skb = info->tx_fixup (dev, skb, GFP_ATOMIC); 1046 if (!skb) { 1047 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); 1048 goto drop; 1049 } 1050 } 1051 length = skb->len; 1052 1053 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { 1054 netif_dbg(dev, tx_err, dev->net, "no urb\n"); 1055 goto drop; 1056 } 1057 1058 entry = (struct skb_data *) skb->cb; 1059 entry->urb = urb; 1060 entry->dev = dev; 1061 entry->state = tx_start; 1062 entry->length = length; 1063 1064 usb_fill_bulk_urb (urb, dev->udev, dev->out, 1065 skb->data, skb->len, tx_complete, skb); 1066 1067 /* don't assume the hardware handles USB_ZERO_PACKET 1068 * NOTE: strictly conforming cdc-ether devices should expect 1069 * the ZLP here, but ignore the one-byte packet. 1070 */ 1071 if (!(info->flags & FLAG_SEND_ZLP) && (length % dev->maxpacket) == 0) { 1072 urb->transfer_buffer_length++; 1073 if (skb_tailroom(skb)) { 1074 skb->data[skb->len] = 0; 1075 __skb_put(skb, 1); 1076 } 1077 } 1078 1079 spin_lock_irqsave(&dev->txq.lock, flags); 1080 retval = usb_autopm_get_interface_async(dev->intf); 1081 if (retval < 0) { 1082 spin_unlock_irqrestore(&dev->txq.lock, flags); 1083 goto drop; 1084 } 1085 1086 #ifdef CONFIG_PM 1087 /* if this triggers the device is still a sleep */ 1088 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { 1089 /* transmission will be done in resume */ 1090 usb_anchor_urb(urb, &dev->deferred); 1091 /* no use to process more packets */ 1092 netif_stop_queue(net); 1093 spin_unlock_irqrestore(&dev->txq.lock, flags); 1094 netdev_dbg(dev->net, "Delaying transmission for resumption\n"); 1095 goto deferred; 1096 } 1097 #endif 1098 1099 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { 1100 case -EPIPE: 1101 netif_stop_queue (net); 1102 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1103 usb_autopm_put_interface_async(dev->intf); 1104 break; 1105 default: 1106 usb_autopm_put_interface_async(dev->intf); 1107 netif_dbg(dev, tx_err, dev->net, 1108 "tx: submit urb err %d\n", retval); 1109 break; 1110 case 0: 1111 net->trans_start = jiffies; 1112 __skb_queue_tail (&dev->txq, skb); 1113 if (dev->txq.qlen >= TX_QLEN (dev)) 1114 netif_stop_queue (net); 1115 } 1116 spin_unlock_irqrestore (&dev->txq.lock, flags); 1117 1118 if (retval) { 1119 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); 1120 drop: 1121 dev->net->stats.tx_dropped++; 1122 if (skb) 1123 dev_kfree_skb_any (skb); 1124 usb_free_urb (urb); 1125 } else 1126 netif_dbg(dev, tx_queued, dev->net, 1127 "> tx, len %d, type 0x%x\n", length, skb->protocol); 1128 #ifdef CONFIG_PM 1129 deferred: 1130 #endif 1131 return NETDEV_TX_OK; 1132 } 1133 EXPORT_SYMBOL_GPL(usbnet_start_xmit); 1134 1135 /*-------------------------------------------------------------------------*/ 1136 1137 // tasklet (work deferred from completions, in_irq) or timer 1138 1139 static void usbnet_bh (unsigned long param) 1140 { 1141 struct usbnet *dev = (struct usbnet *) param; 1142 struct sk_buff *skb; 1143 struct skb_data *entry; 1144 1145 while ((skb = skb_dequeue (&dev->done))) { 1146 entry = (struct skb_data *) skb->cb; 1147 switch (entry->state) { 1148 case rx_done: 1149 entry->state = rx_cleanup; 1150 rx_process (dev, skb); 1151 continue; 1152 case tx_done: 1153 case rx_cleanup: 1154 usb_free_urb (entry->urb); 1155 dev_kfree_skb (skb); 1156 continue; 1157 default: 1158 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); 1159 } 1160 } 1161 1162 // waiting for all pending urbs to complete? 1163 if (dev->wait) { 1164 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) { 1165 wake_up (dev->wait); 1166 } 1167 1168 // or are we maybe short a few urbs? 1169 } else if (netif_running (dev->net) && 1170 netif_device_present (dev->net) && 1171 !timer_pending (&dev->delay) && 1172 !test_bit (EVENT_RX_HALT, &dev->flags)) { 1173 int temp = dev->rxq.qlen; 1174 int qlen = RX_QLEN (dev); 1175 1176 if (temp < qlen) { 1177 struct urb *urb; 1178 int i; 1179 1180 // don't refill the queue all at once 1181 for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) { 1182 urb = usb_alloc_urb (0, GFP_ATOMIC); 1183 if (urb != NULL) 1184 rx_submit (dev, urb, GFP_ATOMIC); 1185 } 1186 if (temp != dev->rxq.qlen) 1187 netif_dbg(dev, link, dev->net, 1188 "rxqlen %d --> %d\n", 1189 temp, dev->rxq.qlen); 1190 if (dev->rxq.qlen < qlen) 1191 tasklet_schedule (&dev->bh); 1192 } 1193 if (dev->txq.qlen < TX_QLEN (dev)) 1194 netif_wake_queue (dev->net); 1195 } 1196 } 1197 1198 1199 /*------------------------------------------------------------------------- 1200 * 1201 * USB Device Driver support 1202 * 1203 *-------------------------------------------------------------------------*/ 1204 1205 // precondition: never called in_interrupt 1206 1207 void usbnet_disconnect (struct usb_interface *intf) 1208 { 1209 struct usbnet *dev; 1210 struct usb_device *xdev; 1211 struct net_device *net; 1212 1213 dev = usb_get_intfdata(intf); 1214 usb_set_intfdata(intf, NULL); 1215 if (!dev) 1216 return; 1217 1218 xdev = interface_to_usbdev (intf); 1219 1220 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", 1221 intf->dev.driver->name, 1222 xdev->bus->bus_name, xdev->devpath, 1223 dev->driver_info->description); 1224 1225 net = dev->net; 1226 unregister_netdev (net); 1227 1228 /* we don't hold rtnl here ... */ 1229 flush_scheduled_work (); 1230 1231 if (dev->driver_info->unbind) 1232 dev->driver_info->unbind (dev, intf); 1233 1234 free_netdev(net); 1235 usb_put_dev (xdev); 1236 } 1237 EXPORT_SYMBOL_GPL(usbnet_disconnect); 1238 1239 static const struct net_device_ops usbnet_netdev_ops = { 1240 .ndo_open = usbnet_open, 1241 .ndo_stop = usbnet_stop, 1242 .ndo_start_xmit = usbnet_start_xmit, 1243 .ndo_tx_timeout = usbnet_tx_timeout, 1244 .ndo_change_mtu = usbnet_change_mtu, 1245 .ndo_set_mac_address = eth_mac_addr, 1246 .ndo_validate_addr = eth_validate_addr, 1247 }; 1248 1249 /*-------------------------------------------------------------------------*/ 1250 1251 // precondition: never called in_interrupt 1252 1253 static struct device_type wlan_type = { 1254 .name = "wlan", 1255 }; 1256 1257 static struct device_type wwan_type = { 1258 .name = "wwan", 1259 }; 1260 1261 int 1262 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) 1263 { 1264 struct usbnet *dev; 1265 struct net_device *net; 1266 struct usb_host_interface *interface; 1267 struct driver_info *info; 1268 struct usb_device *xdev; 1269 int status; 1270 const char *name; 1271 1272 name = udev->dev.driver->name; 1273 info = (struct driver_info *) prod->driver_info; 1274 if (!info) { 1275 dev_dbg (&udev->dev, "blacklisted by %s\n", name); 1276 return -ENODEV; 1277 } 1278 xdev = interface_to_usbdev (udev); 1279 interface = udev->cur_altsetting; 1280 1281 usb_get_dev (xdev); 1282 1283 status = -ENOMEM; 1284 1285 // set up our own records 1286 net = alloc_etherdev(sizeof(*dev)); 1287 if (!net) { 1288 dbg ("can't kmalloc dev"); 1289 goto out; 1290 } 1291 1292 dev = netdev_priv(net); 1293 dev->udev = xdev; 1294 dev->intf = udev; 1295 dev->driver_info = info; 1296 dev->driver_name = name; 1297 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV 1298 | NETIF_MSG_PROBE | NETIF_MSG_LINK); 1299 skb_queue_head_init (&dev->rxq); 1300 skb_queue_head_init (&dev->txq); 1301 skb_queue_head_init (&dev->done); 1302 skb_queue_head_init(&dev->rxq_pause); 1303 dev->bh.func = usbnet_bh; 1304 dev->bh.data = (unsigned long) dev; 1305 INIT_WORK (&dev->kevent, kevent); 1306 init_usb_anchor(&dev->deferred); 1307 dev->delay.function = usbnet_bh; 1308 dev->delay.data = (unsigned long) dev; 1309 init_timer (&dev->delay); 1310 mutex_init (&dev->phy_mutex); 1311 1312 dev->net = net; 1313 strcpy (net->name, "usb%d"); 1314 memcpy (net->dev_addr, node_id, sizeof node_id); 1315 1316 /* rx and tx sides can use different message sizes; 1317 * bind() should set rx_urb_size in that case. 1318 */ 1319 dev->hard_mtu = net->mtu + net->hard_header_len; 1320 #if 0 1321 // dma_supported() is deeply broken on almost all architectures 1322 // possible with some EHCI controllers 1323 if (dma_supported (&udev->dev, DMA_BIT_MASK(64))) 1324 net->features |= NETIF_F_HIGHDMA; 1325 #endif 1326 1327 net->netdev_ops = &usbnet_netdev_ops; 1328 net->watchdog_timeo = TX_TIMEOUT_JIFFIES; 1329 net->ethtool_ops = &usbnet_ethtool_ops; 1330 1331 // allow device-specific bind/init procedures 1332 // NOTE net->name still not usable ... 1333 if (info->bind) { 1334 status = info->bind (dev, udev); 1335 if (status < 0) 1336 goto out1; 1337 1338 // heuristic: "usb%d" for links we know are two-host, 1339 // else "eth%d" when there's reasonable doubt. userspace 1340 // can rename the link if it knows better. 1341 if ((dev->driver_info->flags & FLAG_ETHER) != 0 && 1342 (net->dev_addr [0] & 0x02) == 0) 1343 strcpy (net->name, "eth%d"); 1344 /* WLAN devices should always be named "wlan%d" */ 1345 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1346 strcpy(net->name, "wlan%d"); 1347 /* WWAN devices should always be named "wwan%d" */ 1348 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1349 strcpy(net->name, "wwan%d"); 1350 1351 /* maybe the remote can't receive an Ethernet MTU */ 1352 if (net->mtu > (dev->hard_mtu - net->hard_header_len)) 1353 net->mtu = dev->hard_mtu - net->hard_header_len; 1354 } else if (!info->in || !info->out) 1355 status = usbnet_get_endpoints (dev, udev); 1356 else { 1357 dev->in = usb_rcvbulkpipe (xdev, info->in); 1358 dev->out = usb_sndbulkpipe (xdev, info->out); 1359 if (!(info->flags & FLAG_NO_SETINT)) 1360 status = usb_set_interface (xdev, 1361 interface->desc.bInterfaceNumber, 1362 interface->desc.bAlternateSetting); 1363 else 1364 status = 0; 1365 1366 } 1367 if (status >= 0 && dev->status) 1368 status = init_status (dev, udev); 1369 if (status < 0) 1370 goto out3; 1371 1372 if (!dev->rx_urb_size) 1373 dev->rx_urb_size = dev->hard_mtu; 1374 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); 1375 1376 SET_NETDEV_DEV(net, &udev->dev); 1377 1378 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1379 SET_NETDEV_DEVTYPE(net, &wlan_type); 1380 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1381 SET_NETDEV_DEVTYPE(net, &wwan_type); 1382 1383 status = register_netdev (net); 1384 if (status) 1385 goto out3; 1386 netif_info(dev, probe, dev->net, 1387 "register '%s' at usb-%s-%s, %s, %pM\n", 1388 udev->dev.driver->name, 1389 xdev->bus->bus_name, xdev->devpath, 1390 dev->driver_info->description, 1391 net->dev_addr); 1392 1393 // ok, it's ready to go. 1394 usb_set_intfdata (udev, dev); 1395 1396 netif_device_attach (net); 1397 1398 if (dev->driver_info->flags & FLAG_LINK_INTR) 1399 netif_carrier_off(net); 1400 1401 return 0; 1402 1403 out3: 1404 if (info->unbind) 1405 info->unbind (dev, udev); 1406 out1: 1407 free_netdev(net); 1408 out: 1409 usb_put_dev(xdev); 1410 return status; 1411 } 1412 EXPORT_SYMBOL_GPL(usbnet_probe); 1413 1414 /*-------------------------------------------------------------------------*/ 1415 1416 /* 1417 * suspend the whole driver as soon as the first interface is suspended 1418 * resume only when the last interface is resumed 1419 */ 1420 1421 int usbnet_suspend (struct usb_interface *intf, pm_message_t message) 1422 { 1423 struct usbnet *dev = usb_get_intfdata(intf); 1424 1425 if (!dev->suspend_count++) { 1426 spin_lock_irq(&dev->txq.lock); 1427 /* don't autosuspend while transmitting */ 1428 if (dev->txq.qlen && (message.event & PM_EVENT_AUTO)) { 1429 spin_unlock_irq(&dev->txq.lock); 1430 return -EBUSY; 1431 } else { 1432 set_bit(EVENT_DEV_ASLEEP, &dev->flags); 1433 spin_unlock_irq(&dev->txq.lock); 1434 } 1435 /* 1436 * accelerate emptying of the rx and queues, to avoid 1437 * having everything error out. 1438 */ 1439 netif_device_detach (dev->net); 1440 usbnet_terminate_urbs(dev); 1441 usb_kill_urb(dev->interrupt); 1442 1443 /* 1444 * reattach so runtime management can use and 1445 * wake the device 1446 */ 1447 netif_device_attach (dev->net); 1448 } 1449 return 0; 1450 } 1451 EXPORT_SYMBOL_GPL(usbnet_suspend); 1452 1453 int usbnet_resume (struct usb_interface *intf) 1454 { 1455 struct usbnet *dev = usb_get_intfdata(intf); 1456 struct sk_buff *skb; 1457 struct urb *res; 1458 int retval; 1459 1460 if (!--dev->suspend_count) { 1461 spin_lock_irq(&dev->txq.lock); 1462 while ((res = usb_get_from_anchor(&dev->deferred))) { 1463 1464 printk(KERN_INFO"%s has delayed data\n", __func__); 1465 skb = (struct sk_buff *)res->context; 1466 retval = usb_submit_urb(res, GFP_ATOMIC); 1467 if (retval < 0) { 1468 dev_kfree_skb_any(skb); 1469 usb_free_urb(res); 1470 usb_autopm_put_interface_async(dev->intf); 1471 } else { 1472 dev->net->trans_start = jiffies; 1473 __skb_queue_tail(&dev->txq, skb); 1474 } 1475 } 1476 1477 smp_mb(); 1478 clear_bit(EVENT_DEV_ASLEEP, &dev->flags); 1479 spin_unlock_irq(&dev->txq.lock); 1480 if (!(dev->txq.qlen >= TX_QLEN(dev))) 1481 netif_start_queue(dev->net); 1482 tasklet_schedule (&dev->bh); 1483 } 1484 return 0; 1485 } 1486 EXPORT_SYMBOL_GPL(usbnet_resume); 1487 1488 1489 /*-------------------------------------------------------------------------*/ 1490 1491 static int __init usbnet_init(void) 1492 { 1493 /* compiler should optimize this out */ 1494 BUILD_BUG_ON (sizeof (((struct sk_buff *)0)->cb) 1495 < sizeof (struct skb_data)); 1496 1497 random_ether_addr(node_id); 1498 return 0; 1499 } 1500 module_init(usbnet_init); 1501 1502 static void __exit usbnet_exit(void) 1503 { 1504 } 1505 module_exit(usbnet_exit); 1506 1507 MODULE_AUTHOR("David Brownell"); 1508 MODULE_DESCRIPTION("USB network driver framework"); 1509 MODULE_LICENSE("GPL"); 1510