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 !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 if (netif_msg_ifdown (dev)) 367 devdbg (dev, "device gone"); 368 netif_device_detach (dev->net); 369 break; 370 default: 371 if (netif_msg_rx_err (dev)) 372 devdbg (dev, "rx submit, %d", retval); 373 tasklet_schedule (&dev->bh); 374 break; 375 case 0: 376 __skb_queue_tail (&dev->rxq, skb); 377 } 378 } else { 379 if (netif_msg_ifdown (dev)) 380 devdbg (dev, "rx: stopped"); 381 retval = -ENOLINK; 382 } 383 spin_unlock_irqrestore (&dev->rxq.lock, lockflags); 384 if (retval) { 385 dev_kfree_skb_any (skb); 386 usb_free_urb (urb); 387 } 388 } 389 390 391 /*-------------------------------------------------------------------------*/ 392 393 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb) 394 { 395 if (dev->driver_info->rx_fixup && 396 !dev->driver_info->rx_fixup (dev, skb)) 397 goto error; 398 // else network stack removes extra byte if we forced a short packet 399 400 if (skb->len) 401 usbnet_skb_return (dev, skb); 402 else { 403 if (netif_msg_rx_err (dev)) 404 devdbg (dev, "drop"); 405 error: 406 dev->net->stats.rx_errors++; 407 skb_queue_tail (&dev->done, skb); 408 } 409 } 410 411 /*-------------------------------------------------------------------------*/ 412 413 static void rx_complete (struct urb *urb) 414 { 415 struct sk_buff *skb = (struct sk_buff *) urb->context; 416 struct skb_data *entry = (struct skb_data *) skb->cb; 417 struct usbnet *dev = entry->dev; 418 int urb_status = urb->status; 419 420 skb_put (skb, urb->actual_length); 421 entry->state = rx_done; 422 entry->urb = NULL; 423 424 switch (urb_status) { 425 /* success */ 426 case 0: 427 if (skb->len < dev->net->hard_header_len) { 428 entry->state = rx_cleanup; 429 dev->net->stats.rx_errors++; 430 dev->net->stats.rx_length_errors++; 431 if (netif_msg_rx_err (dev)) 432 devdbg (dev, "rx length %d", skb->len); 433 } 434 break; 435 436 /* stalls need manual reset. this is rare ... except that 437 * when going through USB 2.0 TTs, unplug appears this way. 438 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ 439 * storm, recovering as needed. 440 */ 441 case -EPIPE: 442 dev->net->stats.rx_errors++; 443 usbnet_defer_kevent (dev, EVENT_RX_HALT); 444 // FALLTHROUGH 445 446 /* software-driven interface shutdown */ 447 case -ECONNRESET: /* async unlink */ 448 case -ESHUTDOWN: /* hardware gone */ 449 if (netif_msg_ifdown (dev)) 450 devdbg (dev, "rx shutdown, code %d", urb_status); 451 goto block; 452 453 /* we get controller i/o faults during khubd disconnect() delays. 454 * throttle down resubmits, to avoid log floods; just temporarily, 455 * so we still recover when the fault isn't a khubd delay. 456 */ 457 case -EPROTO: 458 case -ETIME: 459 case -EILSEQ: 460 dev->net->stats.rx_errors++; 461 if (!timer_pending (&dev->delay)) { 462 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); 463 if (netif_msg_link (dev)) 464 devdbg (dev, "rx throttle %d", urb_status); 465 } 466 block: 467 entry->state = rx_cleanup; 468 entry->urb = urb; 469 urb = NULL; 470 break; 471 472 /* data overrun ... flush fifo? */ 473 case -EOVERFLOW: 474 dev->net->stats.rx_over_errors++; 475 // FALLTHROUGH 476 477 default: 478 entry->state = rx_cleanup; 479 dev->net->stats.rx_errors++; 480 if (netif_msg_rx_err (dev)) 481 devdbg (dev, "rx status %d", urb_status); 482 break; 483 } 484 485 defer_bh(dev, skb, &dev->rxq); 486 487 if (urb) { 488 if (netif_running (dev->net) && 489 !test_bit (EVENT_RX_HALT, &dev->flags)) { 490 rx_submit (dev, urb, GFP_ATOMIC); 491 return; 492 } 493 usb_free_urb (urb); 494 } 495 if (netif_msg_rx_err (dev)) 496 devdbg (dev, "no read resubmitted"); 497 } 498 499 static void intr_complete (struct urb *urb) 500 { 501 struct usbnet *dev = urb->context; 502 int status = urb->status; 503 504 switch (status) { 505 /* success */ 506 case 0: 507 dev->driver_info->status(dev, urb); 508 break; 509 510 /* software-driven interface shutdown */ 511 case -ENOENT: /* urb killed */ 512 case -ESHUTDOWN: /* hardware gone */ 513 if (netif_msg_ifdown (dev)) 514 devdbg (dev, "intr shutdown, code %d", status); 515 return; 516 517 /* NOTE: not throttling like RX/TX, since this endpoint 518 * already polls infrequently 519 */ 520 default: 521 devdbg (dev, "intr status %d", status); 522 break; 523 } 524 525 if (!netif_running (dev->net)) 526 return; 527 528 memset(urb->transfer_buffer, 0, urb->transfer_buffer_length); 529 status = usb_submit_urb (urb, GFP_ATOMIC); 530 if (status != 0 && netif_msg_timer (dev)) 531 deverr(dev, "intr resubmit --> %d", status); 532 } 533 534 /*-------------------------------------------------------------------------*/ 535 void usbnet_pause_rx(struct usbnet *dev) 536 { 537 set_bit(EVENT_RX_PAUSED, &dev->flags); 538 539 if (netif_msg_rx_status(dev)) 540 devdbg(dev, "paused rx queue enabled"); 541 } 542 EXPORT_SYMBOL_GPL(usbnet_pause_rx); 543 544 void usbnet_resume_rx(struct usbnet *dev) 545 { 546 struct sk_buff *skb; 547 int num = 0; 548 549 clear_bit(EVENT_RX_PAUSED, &dev->flags); 550 551 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) { 552 usbnet_skb_return(dev, skb); 553 num++; 554 } 555 556 tasklet_schedule(&dev->bh); 557 558 if (netif_msg_rx_status(dev)) 559 devdbg(dev, "paused rx queue disabled, %d skbs requeued", num); 560 } 561 EXPORT_SYMBOL_GPL(usbnet_resume_rx); 562 563 void usbnet_purge_paused_rxq(struct usbnet *dev) 564 { 565 skb_queue_purge(&dev->rxq_pause); 566 } 567 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq); 568 569 /*-------------------------------------------------------------------------*/ 570 571 // unlink pending rx/tx; completion handlers do all other cleanup 572 573 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) 574 { 575 unsigned long flags; 576 struct sk_buff *skb, *skbnext; 577 int count = 0; 578 579 spin_lock_irqsave (&q->lock, flags); 580 skb_queue_walk_safe(q, skb, skbnext) { 581 struct skb_data *entry; 582 struct urb *urb; 583 int retval; 584 585 entry = (struct skb_data *) skb->cb; 586 urb = entry->urb; 587 588 // during some PM-driven resume scenarios, 589 // these (async) unlinks complete immediately 590 retval = usb_unlink_urb (urb); 591 if (retval != -EINPROGRESS && retval != 0) 592 devdbg (dev, "unlink urb err, %d", retval); 593 else 594 count++; 595 } 596 spin_unlock_irqrestore (&q->lock, flags); 597 return count; 598 } 599 600 // Flush all pending rx urbs 601 // minidrivers may need to do this when the MTU changes 602 603 void usbnet_unlink_rx_urbs(struct usbnet *dev) 604 { 605 if (netif_running(dev->net)) { 606 (void) unlink_urbs (dev, &dev->rxq); 607 tasklet_schedule(&dev->bh); 608 } 609 } 610 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); 611 612 /*-------------------------------------------------------------------------*/ 613 614 // precondition: never called in_interrupt 615 static void usbnet_terminate_urbs(struct usbnet *dev) 616 { 617 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup); 618 DECLARE_WAITQUEUE(wait, current); 619 int temp; 620 621 /* ensure there are no more active urbs */ 622 add_wait_queue(&unlink_wakeup, &wait); 623 set_current_state(TASK_UNINTERRUPTIBLE); 624 dev->wait = &unlink_wakeup; 625 temp = unlink_urbs(dev, &dev->txq) + 626 unlink_urbs(dev, &dev->rxq); 627 628 /* maybe wait for deletions to finish. */ 629 while (!skb_queue_empty(&dev->rxq) 630 && !skb_queue_empty(&dev->txq) 631 && !skb_queue_empty(&dev->done)) { 632 schedule_timeout(UNLINK_TIMEOUT_MS); 633 set_current_state(TASK_UNINTERRUPTIBLE); 634 if (netif_msg_ifdown(dev)) 635 devdbg(dev, "waited for %d urb completions", 636 temp); 637 } 638 set_current_state(TASK_RUNNING); 639 dev->wait = NULL; 640 remove_wait_queue(&unlink_wakeup, &wait); 641 } 642 643 int usbnet_stop (struct net_device *net) 644 { 645 struct usbnet *dev = netdev_priv(net); 646 struct driver_info *info = dev->driver_info; 647 int retval; 648 649 netif_stop_queue (net); 650 651 if (netif_msg_ifdown (dev)) 652 devinfo (dev, "stop stats: rx/tx %ld/%ld, errs %ld/%ld", 653 net->stats.rx_packets, net->stats.tx_packets, 654 net->stats.rx_errors, net->stats.tx_errors 655 ); 656 657 /* allow minidriver to stop correctly (wireless devices to turn off 658 * radio etc) */ 659 if (info->stop) { 660 retval = info->stop(dev); 661 if (retval < 0 && netif_msg_ifdown(dev)) 662 devinfo(dev, 663 "stop fail (%d) usbnet usb-%s-%s, %s", 664 retval, 665 dev->udev->bus->bus_name, dev->udev->devpath, 666 info->description); 667 } 668 669 if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) 670 usbnet_terminate_urbs(dev); 671 672 usb_kill_urb(dev->interrupt); 673 674 usbnet_purge_paused_rxq(dev); 675 676 /* deferred work (task, timer, softirq) must also stop. 677 * can't flush_scheduled_work() until we drop rtnl (later), 678 * else workers could deadlock; so make workers a NOP. 679 */ 680 dev->flags = 0; 681 del_timer_sync (&dev->delay); 682 tasklet_kill (&dev->bh); 683 if (info->manage_power) 684 info->manage_power(dev, 0); 685 else 686 usb_autopm_put_interface(dev->intf); 687 688 return 0; 689 } 690 EXPORT_SYMBOL_GPL(usbnet_stop); 691 692 /*-------------------------------------------------------------------------*/ 693 694 // posts reads, and enables write queuing 695 696 // precondition: never called in_interrupt 697 698 int usbnet_open (struct net_device *net) 699 { 700 struct usbnet *dev = netdev_priv(net); 701 int retval; 702 struct driver_info *info = dev->driver_info; 703 704 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { 705 if (netif_msg_ifup (dev)) 706 devinfo (dev, 707 "resumption fail (%d) usbnet usb-%s-%s, %s", 708 retval, 709 dev->udev->bus->bus_name, dev->udev->devpath, 710 info->description); 711 goto done_nopm; 712 } 713 714 // put into "known safe" state 715 if (info->reset && (retval = info->reset (dev)) < 0) { 716 if (netif_msg_ifup (dev)) 717 devinfo (dev, 718 "open reset fail (%d) usbnet usb-%s-%s, %s", 719 retval, 720 dev->udev->bus->bus_name, dev->udev->devpath, 721 info->description); 722 goto done; 723 } 724 725 // insist peer be connected 726 if (info->check_connect && (retval = info->check_connect (dev)) < 0) { 727 if (netif_msg_ifup (dev)) 728 devdbg (dev, "can't open; %d", retval); 729 goto done; 730 } 731 732 /* start any status interrupt transfer */ 733 if (dev->interrupt) { 734 retval = usb_submit_urb (dev->interrupt, GFP_KERNEL); 735 if (retval < 0) { 736 if (netif_msg_ifup (dev)) 737 deverr (dev, "intr submit %d", retval); 738 goto done; 739 } 740 } 741 742 netif_start_queue (net); 743 if (netif_msg_ifup (dev)) { 744 char *framing; 745 746 if (dev->driver_info->flags & FLAG_FRAMING_NC) 747 framing = "NetChip"; 748 else if (dev->driver_info->flags & FLAG_FRAMING_GL) 749 framing = "GeneSys"; 750 else if (dev->driver_info->flags & FLAG_FRAMING_Z) 751 framing = "Zaurus"; 752 else if (dev->driver_info->flags & FLAG_FRAMING_RN) 753 framing = "RNDIS"; 754 else if (dev->driver_info->flags & FLAG_FRAMING_AX) 755 framing = "ASIX"; 756 else 757 framing = "simple"; 758 759 devinfo (dev, "open: enable queueing " 760 "(rx %d, tx %d) mtu %d %s framing", 761 (int)RX_QLEN (dev), (int)TX_QLEN (dev), dev->net->mtu, 762 framing); 763 } 764 765 // delay posting reads until we're fully open 766 tasklet_schedule (&dev->bh); 767 if (info->manage_power) { 768 retval = info->manage_power(dev, 1); 769 if (retval < 0) 770 goto done; 771 usb_autopm_put_interface(dev->intf); 772 } 773 return retval; 774 done: 775 usb_autopm_put_interface(dev->intf); 776 done_nopm: 777 return retval; 778 } 779 EXPORT_SYMBOL_GPL(usbnet_open); 780 781 /*-------------------------------------------------------------------------*/ 782 783 /* ethtool methods; minidrivers may need to add some more, but 784 * they'll probably want to use this base set. 785 */ 786 787 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd) 788 { 789 struct usbnet *dev = netdev_priv(net); 790 791 if (!dev->mii.mdio_read) 792 return -EOPNOTSUPP; 793 794 return mii_ethtool_gset(&dev->mii, cmd); 795 } 796 EXPORT_SYMBOL_GPL(usbnet_get_settings); 797 798 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd) 799 { 800 struct usbnet *dev = netdev_priv(net); 801 int retval; 802 803 if (!dev->mii.mdio_write) 804 return -EOPNOTSUPP; 805 806 retval = mii_ethtool_sset(&dev->mii, cmd); 807 808 /* link speed/duplex might have changed */ 809 if (dev->driver_info->link_reset) 810 dev->driver_info->link_reset(dev); 811 812 return retval; 813 814 } 815 EXPORT_SYMBOL_GPL(usbnet_set_settings); 816 817 u32 usbnet_get_link (struct net_device *net) 818 { 819 struct usbnet *dev = netdev_priv(net); 820 821 /* If a check_connect is defined, return its result */ 822 if (dev->driver_info->check_connect) 823 return dev->driver_info->check_connect (dev) == 0; 824 825 /* if the device has mii operations, use those */ 826 if (dev->mii.mdio_read) 827 return mii_link_ok(&dev->mii); 828 829 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ 830 return ethtool_op_get_link(net); 831 } 832 EXPORT_SYMBOL_GPL(usbnet_get_link); 833 834 int usbnet_nway_reset(struct net_device *net) 835 { 836 struct usbnet *dev = netdev_priv(net); 837 838 if (!dev->mii.mdio_write) 839 return -EOPNOTSUPP; 840 841 return mii_nway_restart(&dev->mii); 842 } 843 EXPORT_SYMBOL_GPL(usbnet_nway_reset); 844 845 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) 846 { 847 struct usbnet *dev = netdev_priv(net); 848 849 strncpy (info->driver, dev->driver_name, sizeof info->driver); 850 strncpy (info->version, DRIVER_VERSION, sizeof info->version); 851 strncpy (info->fw_version, dev->driver_info->description, 852 sizeof info->fw_version); 853 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); 854 } 855 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); 856 857 u32 usbnet_get_msglevel (struct net_device *net) 858 { 859 struct usbnet *dev = netdev_priv(net); 860 861 return dev->msg_enable; 862 } 863 EXPORT_SYMBOL_GPL(usbnet_get_msglevel); 864 865 void usbnet_set_msglevel (struct net_device *net, u32 level) 866 { 867 struct usbnet *dev = netdev_priv(net); 868 869 dev->msg_enable = level; 870 } 871 EXPORT_SYMBOL_GPL(usbnet_set_msglevel); 872 873 /* drivers may override default ethtool_ops in their bind() routine */ 874 static const struct ethtool_ops usbnet_ethtool_ops = { 875 .get_settings = usbnet_get_settings, 876 .set_settings = usbnet_set_settings, 877 .get_link = usbnet_get_link, 878 .nway_reset = usbnet_nway_reset, 879 .get_drvinfo = usbnet_get_drvinfo, 880 .get_msglevel = usbnet_get_msglevel, 881 .set_msglevel = usbnet_set_msglevel, 882 }; 883 884 /*-------------------------------------------------------------------------*/ 885 886 /* work that cannot be done in interrupt context uses keventd. 887 * 888 * NOTE: with 2.5 we could do more of this using completion callbacks, 889 * especially now that control transfers can be queued. 890 */ 891 static void 892 kevent (struct work_struct *work) 893 { 894 struct usbnet *dev = 895 container_of(work, struct usbnet, kevent); 896 int status; 897 898 /* usb_clear_halt() needs a thread context */ 899 if (test_bit (EVENT_TX_HALT, &dev->flags)) { 900 unlink_urbs (dev, &dev->txq); 901 status = usb_autopm_get_interface(dev->intf); 902 if (status < 0) 903 goto fail_pipe; 904 status = usb_clear_halt (dev->udev, dev->out); 905 usb_autopm_put_interface(dev->intf); 906 if (status < 0 && 907 status != -EPIPE && 908 status != -ESHUTDOWN) { 909 if (netif_msg_tx_err (dev)) 910 fail_pipe: 911 deverr (dev, "can't clear tx halt, status %d", 912 status); 913 } else { 914 clear_bit (EVENT_TX_HALT, &dev->flags); 915 if (status != -ESHUTDOWN) 916 netif_wake_queue (dev->net); 917 } 918 } 919 if (test_bit (EVENT_RX_HALT, &dev->flags)) { 920 unlink_urbs (dev, &dev->rxq); 921 status = usb_autopm_get_interface(dev->intf); 922 if (status < 0) 923 goto fail_halt; 924 status = usb_clear_halt (dev->udev, dev->in); 925 usb_autopm_put_interface(dev->intf); 926 if (status < 0 && 927 status != -EPIPE && 928 status != -ESHUTDOWN) { 929 if (netif_msg_rx_err (dev)) 930 fail_halt: 931 deverr (dev, "can't clear rx halt, status %d", 932 status); 933 } else { 934 clear_bit (EVENT_RX_HALT, &dev->flags); 935 tasklet_schedule (&dev->bh); 936 } 937 } 938 939 /* tasklet could resubmit itself forever if memory is tight */ 940 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { 941 struct urb *urb = NULL; 942 943 if (netif_running (dev->net)) 944 urb = usb_alloc_urb (0, GFP_KERNEL); 945 else 946 clear_bit (EVENT_RX_MEMORY, &dev->flags); 947 if (urb != NULL) { 948 clear_bit (EVENT_RX_MEMORY, &dev->flags); 949 status = usb_autopm_get_interface(dev->intf); 950 if (status < 0) 951 goto fail_lowmem; 952 rx_submit (dev, urb, GFP_KERNEL); 953 usb_autopm_put_interface(dev->intf); 954 fail_lowmem: 955 tasklet_schedule (&dev->bh); 956 } 957 } 958 959 if (test_bit (EVENT_LINK_RESET, &dev->flags)) { 960 struct driver_info *info = dev->driver_info; 961 int retval = 0; 962 963 clear_bit (EVENT_LINK_RESET, &dev->flags); 964 status = usb_autopm_get_interface(dev->intf); 965 if (status < 0) 966 goto skip_reset; 967 if(info->link_reset && (retval = info->link_reset(dev)) < 0) { 968 usb_autopm_put_interface(dev->intf); 969 skip_reset: 970 devinfo(dev, "link reset failed (%d) usbnet usb-%s-%s, %s", 971 retval, 972 dev->udev->bus->bus_name, dev->udev->devpath, 973 info->description); 974 } else { 975 usb_autopm_put_interface(dev->intf); 976 } 977 } 978 979 if (dev->flags) 980 devdbg (dev, "kevent done, flags = 0x%lx", 981 dev->flags); 982 } 983 984 /*-------------------------------------------------------------------------*/ 985 986 static void tx_complete (struct urb *urb) 987 { 988 struct sk_buff *skb = (struct sk_buff *) urb->context; 989 struct skb_data *entry = (struct skb_data *) skb->cb; 990 struct usbnet *dev = entry->dev; 991 992 if (urb->status == 0) { 993 dev->net->stats.tx_packets++; 994 dev->net->stats.tx_bytes += entry->length; 995 } else { 996 dev->net->stats.tx_errors++; 997 998 switch (urb->status) { 999 case -EPIPE: 1000 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1001 break; 1002 1003 /* software-driven interface shutdown */ 1004 case -ECONNRESET: // async unlink 1005 case -ESHUTDOWN: // hardware gone 1006 break; 1007 1008 // like rx, tx gets controller i/o faults during khubd delays 1009 // and so it uses the same throttling mechanism. 1010 case -EPROTO: 1011 case -ETIME: 1012 case -EILSEQ: 1013 usb_mark_last_busy(dev->udev); 1014 if (!timer_pending (&dev->delay)) { 1015 mod_timer (&dev->delay, 1016 jiffies + THROTTLE_JIFFIES); 1017 if (netif_msg_link (dev)) 1018 devdbg (dev, "tx throttle %d", 1019 urb->status); 1020 } 1021 netif_stop_queue (dev->net); 1022 break; 1023 default: 1024 if (netif_msg_tx_err (dev)) 1025 devdbg (dev, "tx err %d", entry->urb->status); 1026 break; 1027 } 1028 } 1029 1030 usb_autopm_put_interface_async(dev->intf); 1031 urb->dev = NULL; 1032 entry->state = tx_done; 1033 defer_bh(dev, skb, &dev->txq); 1034 } 1035 1036 /*-------------------------------------------------------------------------*/ 1037 1038 void usbnet_tx_timeout (struct net_device *net) 1039 { 1040 struct usbnet *dev = netdev_priv(net); 1041 1042 unlink_urbs (dev, &dev->txq); 1043 tasklet_schedule (&dev->bh); 1044 1045 // FIXME: device recovery -- reset? 1046 } 1047 EXPORT_SYMBOL_GPL(usbnet_tx_timeout); 1048 1049 /*-------------------------------------------------------------------------*/ 1050 1051 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, 1052 struct net_device *net) 1053 { 1054 struct usbnet *dev = netdev_priv(net); 1055 int length; 1056 struct urb *urb = NULL; 1057 struct skb_data *entry; 1058 struct driver_info *info = dev->driver_info; 1059 unsigned long flags; 1060 int retval; 1061 1062 // some devices want funky USB-level framing, for 1063 // win32 driver (usually) and/or hardware quirks 1064 if (info->tx_fixup) { 1065 skb = info->tx_fixup (dev, skb, GFP_ATOMIC); 1066 if (!skb) { 1067 if (netif_msg_tx_err (dev)) 1068 devdbg (dev, "can't tx_fixup skb"); 1069 goto drop; 1070 } 1071 } 1072 length = skb->len; 1073 1074 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { 1075 if (netif_msg_tx_err (dev)) 1076 devdbg (dev, "no urb"); 1077 goto drop; 1078 } 1079 1080 entry = (struct skb_data *) skb->cb; 1081 entry->urb = urb; 1082 entry->dev = dev; 1083 entry->state = tx_start; 1084 entry->length = length; 1085 1086 usb_fill_bulk_urb (urb, dev->udev, dev->out, 1087 skb->data, skb->len, tx_complete, skb); 1088 1089 /* don't assume the hardware handles USB_ZERO_PACKET 1090 * NOTE: strictly conforming cdc-ether devices should expect 1091 * the ZLP here, but ignore the one-byte packet. 1092 */ 1093 if (!(info->flags & FLAG_SEND_ZLP) && (length % dev->maxpacket) == 0) { 1094 urb->transfer_buffer_length++; 1095 if (skb_tailroom(skb)) { 1096 skb->data[skb->len] = 0; 1097 __skb_put(skb, 1); 1098 } 1099 } 1100 1101 spin_lock_irqsave(&dev->txq.lock, flags); 1102 retval = usb_autopm_get_interface_async(dev->intf); 1103 if (retval < 0) { 1104 spin_unlock_irqrestore(&dev->txq.lock, flags); 1105 goto drop; 1106 } 1107 1108 #ifdef CONFIG_PM 1109 /* if this triggers the device is still a sleep */ 1110 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { 1111 /* transmission will be done in resume */ 1112 usb_anchor_urb(urb, &dev->deferred); 1113 /* no use to process more packets */ 1114 netif_stop_queue(net); 1115 spin_unlock_irqrestore(&dev->txq.lock, flags); 1116 devdbg(dev, "Delaying transmission for resumption"); 1117 goto deferred; 1118 } 1119 #endif 1120 1121 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { 1122 case -EPIPE: 1123 netif_stop_queue (net); 1124 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1125 usb_autopm_put_interface_async(dev->intf); 1126 break; 1127 default: 1128 usb_autopm_put_interface_async(dev->intf); 1129 if (netif_msg_tx_err (dev)) 1130 devdbg (dev, "tx: submit urb err %d", retval); 1131 break; 1132 case 0: 1133 net->trans_start = jiffies; 1134 __skb_queue_tail (&dev->txq, skb); 1135 if (dev->txq.qlen >= TX_QLEN (dev)) 1136 netif_stop_queue (net); 1137 } 1138 spin_unlock_irqrestore (&dev->txq.lock, flags); 1139 1140 if (retval) { 1141 if (netif_msg_tx_err (dev)) 1142 devdbg (dev, "drop, code %d", retval); 1143 drop: 1144 dev->net->stats.tx_dropped++; 1145 if (skb) 1146 dev_kfree_skb_any (skb); 1147 usb_free_urb (urb); 1148 } else if (netif_msg_tx_queued (dev)) { 1149 devdbg (dev, "> tx, len %d, type 0x%x", 1150 length, skb->protocol); 1151 } 1152 #ifdef CONFIG_PM 1153 deferred: 1154 #endif 1155 return NETDEV_TX_OK; 1156 } 1157 EXPORT_SYMBOL_GPL(usbnet_start_xmit); 1158 1159 /*-------------------------------------------------------------------------*/ 1160 1161 // tasklet (work deferred from completions, in_irq) or timer 1162 1163 static void usbnet_bh (unsigned long param) 1164 { 1165 struct usbnet *dev = (struct usbnet *) param; 1166 struct sk_buff *skb; 1167 struct skb_data *entry; 1168 1169 while ((skb = skb_dequeue (&dev->done))) { 1170 entry = (struct skb_data *) skb->cb; 1171 switch (entry->state) { 1172 case rx_done: 1173 entry->state = rx_cleanup; 1174 rx_process (dev, skb); 1175 continue; 1176 case tx_done: 1177 case rx_cleanup: 1178 usb_free_urb (entry->urb); 1179 dev_kfree_skb (skb); 1180 continue; 1181 default: 1182 devdbg (dev, "bogus skb state %d", entry->state); 1183 } 1184 } 1185 1186 // waiting for all pending urbs to complete? 1187 if (dev->wait) { 1188 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) { 1189 wake_up (dev->wait); 1190 } 1191 1192 // or are we maybe short a few urbs? 1193 } else if (netif_running (dev->net) && 1194 netif_device_present (dev->net) && 1195 !timer_pending (&dev->delay) && 1196 !test_bit (EVENT_RX_HALT, &dev->flags)) { 1197 int temp = dev->rxq.qlen; 1198 int qlen = RX_QLEN (dev); 1199 1200 if (temp < qlen) { 1201 struct urb *urb; 1202 int i; 1203 1204 // don't refill the queue all at once 1205 for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) { 1206 urb = usb_alloc_urb (0, GFP_ATOMIC); 1207 if (urb != NULL) 1208 rx_submit (dev, urb, GFP_ATOMIC); 1209 } 1210 if (temp != dev->rxq.qlen && netif_msg_link (dev)) 1211 devdbg (dev, "rxqlen %d --> %d", 1212 temp, dev->rxq.qlen); 1213 if (dev->rxq.qlen < qlen) 1214 tasklet_schedule (&dev->bh); 1215 } 1216 if (dev->txq.qlen < TX_QLEN (dev)) 1217 netif_wake_queue (dev->net); 1218 } 1219 } 1220 1221 1222 /*------------------------------------------------------------------------- 1223 * 1224 * USB Device Driver support 1225 * 1226 *-------------------------------------------------------------------------*/ 1227 1228 // precondition: never called in_interrupt 1229 1230 void usbnet_disconnect (struct usb_interface *intf) 1231 { 1232 struct usbnet *dev; 1233 struct usb_device *xdev; 1234 struct net_device *net; 1235 1236 dev = usb_get_intfdata(intf); 1237 usb_set_intfdata(intf, NULL); 1238 if (!dev) 1239 return; 1240 1241 xdev = interface_to_usbdev (intf); 1242 1243 if (netif_msg_probe (dev)) 1244 devinfo (dev, "unregister '%s' usb-%s-%s, %s", 1245 intf->dev.driver->name, 1246 xdev->bus->bus_name, xdev->devpath, 1247 dev->driver_info->description); 1248 1249 net = dev->net; 1250 unregister_netdev (net); 1251 1252 /* we don't hold rtnl here ... */ 1253 flush_scheduled_work (); 1254 1255 if (dev->driver_info->unbind) 1256 dev->driver_info->unbind (dev, intf); 1257 1258 free_netdev(net); 1259 usb_put_dev (xdev); 1260 } 1261 EXPORT_SYMBOL_GPL(usbnet_disconnect); 1262 1263 static const struct net_device_ops usbnet_netdev_ops = { 1264 .ndo_open = usbnet_open, 1265 .ndo_stop = usbnet_stop, 1266 .ndo_start_xmit = usbnet_start_xmit, 1267 .ndo_tx_timeout = usbnet_tx_timeout, 1268 .ndo_change_mtu = usbnet_change_mtu, 1269 .ndo_set_mac_address = eth_mac_addr, 1270 .ndo_validate_addr = eth_validate_addr, 1271 }; 1272 1273 /*-------------------------------------------------------------------------*/ 1274 1275 // precondition: never called in_interrupt 1276 1277 static struct device_type wlan_type = { 1278 .name = "wlan", 1279 }; 1280 1281 static struct device_type wwan_type = { 1282 .name = "wwan", 1283 }; 1284 1285 int 1286 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) 1287 { 1288 struct usbnet *dev; 1289 struct net_device *net; 1290 struct usb_host_interface *interface; 1291 struct driver_info *info; 1292 struct usb_device *xdev; 1293 int status; 1294 const char *name; 1295 1296 name = udev->dev.driver->name; 1297 info = (struct driver_info *) prod->driver_info; 1298 if (!info) { 1299 dev_dbg (&udev->dev, "blacklisted by %s\n", name); 1300 return -ENODEV; 1301 } 1302 xdev = interface_to_usbdev (udev); 1303 interface = udev->cur_altsetting; 1304 1305 usb_get_dev (xdev); 1306 1307 status = -ENOMEM; 1308 1309 // set up our own records 1310 net = alloc_etherdev(sizeof(*dev)); 1311 if (!net) { 1312 dbg ("can't kmalloc dev"); 1313 goto out; 1314 } 1315 1316 dev = netdev_priv(net); 1317 dev->udev = xdev; 1318 dev->intf = udev; 1319 dev->driver_info = info; 1320 dev->driver_name = name; 1321 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV 1322 | NETIF_MSG_PROBE | NETIF_MSG_LINK); 1323 skb_queue_head_init (&dev->rxq); 1324 skb_queue_head_init (&dev->txq); 1325 skb_queue_head_init (&dev->done); 1326 skb_queue_head_init(&dev->rxq_pause); 1327 dev->bh.func = usbnet_bh; 1328 dev->bh.data = (unsigned long) dev; 1329 INIT_WORK (&dev->kevent, kevent); 1330 init_usb_anchor(&dev->deferred); 1331 dev->delay.function = usbnet_bh; 1332 dev->delay.data = (unsigned long) dev; 1333 init_timer (&dev->delay); 1334 mutex_init (&dev->phy_mutex); 1335 1336 dev->net = net; 1337 strcpy (net->name, "usb%d"); 1338 memcpy (net->dev_addr, node_id, sizeof node_id); 1339 1340 /* rx and tx sides can use different message sizes; 1341 * bind() should set rx_urb_size in that case. 1342 */ 1343 dev->hard_mtu = net->mtu + net->hard_header_len; 1344 #if 0 1345 // dma_supported() is deeply broken on almost all architectures 1346 // possible with some EHCI controllers 1347 if (dma_supported (&udev->dev, DMA_BIT_MASK(64))) 1348 net->features |= NETIF_F_HIGHDMA; 1349 #endif 1350 1351 net->netdev_ops = &usbnet_netdev_ops; 1352 net->watchdog_timeo = TX_TIMEOUT_JIFFIES; 1353 net->ethtool_ops = &usbnet_ethtool_ops; 1354 1355 // allow device-specific bind/init procedures 1356 // NOTE net->name still not usable ... 1357 if (info->bind) { 1358 status = info->bind (dev, udev); 1359 if (status < 0) 1360 goto out1; 1361 1362 // heuristic: "usb%d" for links we know are two-host, 1363 // else "eth%d" when there's reasonable doubt. userspace 1364 // can rename the link if it knows better. 1365 if ((dev->driver_info->flags & FLAG_ETHER) != 0 && 1366 (net->dev_addr [0] & 0x02) == 0) 1367 strcpy (net->name, "eth%d"); 1368 /* WLAN devices should always be named "wlan%d" */ 1369 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1370 strcpy(net->name, "wlan%d"); 1371 /* WWAN devices should always be named "wwan%d" */ 1372 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1373 strcpy(net->name, "wwan%d"); 1374 1375 /* maybe the remote can't receive an Ethernet MTU */ 1376 if (net->mtu > (dev->hard_mtu - net->hard_header_len)) 1377 net->mtu = dev->hard_mtu - net->hard_header_len; 1378 } else if (!info->in || !info->out) 1379 status = usbnet_get_endpoints (dev, udev); 1380 else { 1381 dev->in = usb_rcvbulkpipe (xdev, info->in); 1382 dev->out = usb_sndbulkpipe (xdev, info->out); 1383 if (!(info->flags & FLAG_NO_SETINT)) 1384 status = usb_set_interface (xdev, 1385 interface->desc.bInterfaceNumber, 1386 interface->desc.bAlternateSetting); 1387 else 1388 status = 0; 1389 1390 } 1391 if (status >= 0 && dev->status) 1392 status = init_status (dev, udev); 1393 if (status < 0) 1394 goto out3; 1395 1396 if (!dev->rx_urb_size) 1397 dev->rx_urb_size = dev->hard_mtu; 1398 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); 1399 1400 SET_NETDEV_DEV(net, &udev->dev); 1401 1402 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1403 SET_NETDEV_DEVTYPE(net, &wlan_type); 1404 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1405 SET_NETDEV_DEVTYPE(net, &wwan_type); 1406 1407 status = register_netdev (net); 1408 if (status) 1409 goto out3; 1410 if (netif_msg_probe (dev)) 1411 devinfo (dev, "register '%s' at usb-%s-%s, %s, %pM", 1412 udev->dev.driver->name, 1413 xdev->bus->bus_name, xdev->devpath, 1414 dev->driver_info->description, 1415 net->dev_addr); 1416 1417 // ok, it's ready to go. 1418 usb_set_intfdata (udev, dev); 1419 1420 netif_device_attach (net); 1421 1422 if (dev->driver_info->flags & FLAG_LINK_INTR) 1423 netif_carrier_off(net); 1424 1425 return 0; 1426 1427 out3: 1428 if (info->unbind) 1429 info->unbind (dev, udev); 1430 out1: 1431 free_netdev(net); 1432 out: 1433 usb_put_dev(xdev); 1434 return status; 1435 } 1436 EXPORT_SYMBOL_GPL(usbnet_probe); 1437 1438 /*-------------------------------------------------------------------------*/ 1439 1440 /* 1441 * suspend the whole driver as soon as the first interface is suspended 1442 * resume only when the last interface is resumed 1443 */ 1444 1445 int usbnet_suspend (struct usb_interface *intf, pm_message_t message) 1446 { 1447 struct usbnet *dev = usb_get_intfdata(intf); 1448 1449 if (!dev->suspend_count++) { 1450 spin_lock_irq(&dev->txq.lock); 1451 /* don't autosuspend while transmitting */ 1452 if (dev->txq.qlen && (message.event & PM_EVENT_AUTO)) { 1453 spin_unlock_irq(&dev->txq.lock); 1454 return -EBUSY; 1455 } else { 1456 set_bit(EVENT_DEV_ASLEEP, &dev->flags); 1457 spin_unlock_irq(&dev->txq.lock); 1458 } 1459 /* 1460 * accelerate emptying of the rx and queues, to avoid 1461 * having everything error out. 1462 */ 1463 netif_device_detach (dev->net); 1464 usbnet_terminate_urbs(dev); 1465 usb_kill_urb(dev->interrupt); 1466 1467 /* 1468 * reattach so runtime management can use and 1469 * wake the device 1470 */ 1471 netif_device_attach (dev->net); 1472 } 1473 return 0; 1474 } 1475 EXPORT_SYMBOL_GPL(usbnet_suspend); 1476 1477 int usbnet_resume (struct usb_interface *intf) 1478 { 1479 struct usbnet *dev = usb_get_intfdata(intf); 1480 struct sk_buff *skb; 1481 struct urb *res; 1482 int retval; 1483 1484 if (!--dev->suspend_count) { 1485 spin_lock_irq(&dev->txq.lock); 1486 while ((res = usb_get_from_anchor(&dev->deferred))) { 1487 1488 printk(KERN_INFO"%s has delayed data\n", __func__); 1489 skb = (struct sk_buff *)res->context; 1490 retval = usb_submit_urb(res, GFP_ATOMIC); 1491 if (retval < 0) { 1492 dev_kfree_skb_any(skb); 1493 usb_free_urb(res); 1494 usb_autopm_put_interface_async(dev->intf); 1495 } else { 1496 dev->net->trans_start = jiffies; 1497 __skb_queue_tail(&dev->txq, skb); 1498 } 1499 } 1500 1501 smp_mb(); 1502 clear_bit(EVENT_DEV_ASLEEP, &dev->flags); 1503 spin_unlock_irq(&dev->txq.lock); 1504 if (!(dev->txq.qlen >= TX_QLEN(dev))) 1505 netif_start_queue(dev->net); 1506 tasklet_schedule (&dev->bh); 1507 } 1508 return 0; 1509 } 1510 EXPORT_SYMBOL_GPL(usbnet_resume); 1511 1512 1513 /*-------------------------------------------------------------------------*/ 1514 1515 static int __init usbnet_init(void) 1516 { 1517 /* compiler should optimize this out */ 1518 BUILD_BUG_ON (sizeof (((struct sk_buff *)0)->cb) 1519 < sizeof (struct skb_data)); 1520 1521 random_ether_addr(node_id); 1522 return 0; 1523 } 1524 module_init(usbnet_init); 1525 1526 static void __exit usbnet_exit(void) 1527 { 1528 } 1529 module_exit(usbnet_exit); 1530 1531 MODULE_AUTHOR("David Brownell"); 1532 MODULE_DESCRIPTION("USB network driver framework"); 1533 MODULE_LICENSE("GPL"); 1534