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 #include <linux/kernel.h> 48 49 #define DRIVER_VERSION "22-Aug-2005" 50 51 52 /*-------------------------------------------------------------------------*/ 53 54 /* 55 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max. 56 * Several dozen bytes of IPv4 data can fit in two such transactions. 57 * One maximum size Ethernet packet takes twenty four of them. 58 * For high speed, each frame comfortably fits almost 36 max size 59 * Ethernet packets (so queues should be bigger). 60 * 61 * REVISIT qlens should be members of 'struct usbnet'; the goal is to 62 * let the USB host controller be busy for 5msec or more before an irq 63 * is required, under load. Jumbograms change the equation. 64 */ 65 #define RX_MAX_QUEUE_MEMORY (60 * 1518) 66 #define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \ 67 (RX_MAX_QUEUE_MEMORY/(dev)->rx_urb_size) : 4) 68 #define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \ 69 (RX_MAX_QUEUE_MEMORY/(dev)->hard_mtu) : 4) 70 71 // reawaken network queue this soon after stopping; else watchdog barks 72 #define TX_TIMEOUT_JIFFIES (5*HZ) 73 74 // throttle rx/tx briefly after some faults, so khubd might disconnect() 75 // us (it polls at HZ/4 usually) before we report too many false errors. 76 #define THROTTLE_JIFFIES (HZ/8) 77 78 // between wakeups 79 #define UNLINK_TIMEOUT_MS 3 80 81 /*-------------------------------------------------------------------------*/ 82 83 // randomly generated ethernet address 84 static u8 node_id [ETH_ALEN]; 85 86 static const char driver_name [] = "usbnet"; 87 88 /* use ethtool to change the level for any given device */ 89 static int msg_level = -1; 90 module_param (msg_level, int, 0); 91 MODULE_PARM_DESC (msg_level, "Override default message level"); 92 93 /*-------------------------------------------------------------------------*/ 94 95 /* handles CDC Ethernet and many other network "bulk data" interfaces */ 96 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf) 97 { 98 int tmp; 99 struct usb_host_interface *alt = NULL; 100 struct usb_host_endpoint *in = NULL, *out = NULL; 101 struct usb_host_endpoint *status = NULL; 102 103 for (tmp = 0; tmp < intf->num_altsetting; tmp++) { 104 unsigned ep; 105 106 in = out = status = NULL; 107 alt = intf->altsetting + tmp; 108 109 /* take the first altsetting with in-bulk + out-bulk; 110 * remember any status endpoint, just in case; 111 * ignore other endpoints and altsetttings. 112 */ 113 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) { 114 struct usb_host_endpoint *e; 115 int intr = 0; 116 117 e = alt->endpoint + ep; 118 switch (e->desc.bmAttributes) { 119 case USB_ENDPOINT_XFER_INT: 120 if (!usb_endpoint_dir_in(&e->desc)) 121 continue; 122 intr = 1; 123 /* FALLTHROUGH */ 124 case USB_ENDPOINT_XFER_BULK: 125 break; 126 default: 127 continue; 128 } 129 if (usb_endpoint_dir_in(&e->desc)) { 130 if (!intr && !in) 131 in = e; 132 else if (intr && !status) 133 status = e; 134 } else { 135 if (!out) 136 out = e; 137 } 138 } 139 if (in && out) 140 break; 141 } 142 if (!alt || !in || !out) 143 return -EINVAL; 144 145 if (alt->desc.bAlternateSetting != 0 || 146 !(dev->driver_info->flags & FLAG_NO_SETINT)) { 147 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber, 148 alt->desc.bAlternateSetting); 149 if (tmp < 0) 150 return tmp; 151 } 152 153 dev->in = usb_rcvbulkpipe (dev->udev, 154 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 155 dev->out = usb_sndbulkpipe (dev->udev, 156 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 157 dev->status = status; 158 return 0; 159 } 160 EXPORT_SYMBOL_GPL(usbnet_get_endpoints); 161 162 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress) 163 { 164 int tmp, i; 165 unsigned char buf [13]; 166 167 tmp = usb_string(dev->udev, iMACAddress, buf, sizeof buf); 168 if (tmp != 12) { 169 dev_dbg(&dev->udev->dev, 170 "bad MAC string %d fetch, %d\n", iMACAddress, tmp); 171 if (tmp >= 0) 172 tmp = -EINVAL; 173 return tmp; 174 } 175 for (i = tmp = 0; i < 6; i++, tmp += 2) 176 dev->net->dev_addr [i] = 177 (hex_to_bin(buf[tmp]) << 4) + hex_to_bin(buf[tmp + 1]); 178 return 0; 179 } 180 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr); 181 182 static void intr_complete (struct urb *urb); 183 184 static int init_status (struct usbnet *dev, struct usb_interface *intf) 185 { 186 char *buf = NULL; 187 unsigned pipe = 0; 188 unsigned maxp; 189 unsigned period; 190 191 if (!dev->driver_info->status) 192 return 0; 193 194 pipe = usb_rcvintpipe (dev->udev, 195 dev->status->desc.bEndpointAddress 196 & USB_ENDPOINT_NUMBER_MASK); 197 maxp = usb_maxpacket (dev->udev, pipe, 0); 198 199 /* avoid 1 msec chatter: min 8 msec poll rate */ 200 period = max ((int) dev->status->desc.bInterval, 201 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3); 202 203 buf = kmalloc (maxp, GFP_KERNEL); 204 if (buf) { 205 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL); 206 if (!dev->interrupt) { 207 kfree (buf); 208 return -ENOMEM; 209 } else { 210 usb_fill_int_urb(dev->interrupt, dev->udev, pipe, 211 buf, maxp, intr_complete, dev, period); 212 dev_dbg(&intf->dev, 213 "status ep%din, %d bytes period %d\n", 214 usb_pipeendpoint(pipe), maxp, period); 215 } 216 } 217 return 0; 218 } 219 220 /* Passes this packet up the stack, updating its accounting. 221 * Some link protocols batch packets, so their rx_fixup paths 222 * can return clones as well as just modify the original skb. 223 */ 224 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb) 225 { 226 int status; 227 228 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) { 229 skb_queue_tail(&dev->rxq_pause, skb); 230 return; 231 } 232 233 skb->protocol = eth_type_trans (skb, dev->net); 234 dev->net->stats.rx_packets++; 235 dev->net->stats.rx_bytes += skb->len; 236 237 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n", 238 skb->len + sizeof (struct ethhdr), skb->protocol); 239 memset (skb->cb, 0, sizeof (struct skb_data)); 240 status = netif_rx (skb); 241 if (status != NET_RX_SUCCESS) 242 netif_dbg(dev, rx_err, dev->net, 243 "netif_rx status %d\n", status); 244 } 245 EXPORT_SYMBOL_GPL(usbnet_skb_return); 246 247 248 /*------------------------------------------------------------------------- 249 * 250 * Network Device Driver (peer link to "Host Device", from USB host) 251 * 252 *-------------------------------------------------------------------------*/ 253 254 int usbnet_change_mtu (struct net_device *net, int new_mtu) 255 { 256 struct usbnet *dev = netdev_priv(net); 257 int ll_mtu = new_mtu + net->hard_header_len; 258 int old_hard_mtu = dev->hard_mtu; 259 int old_rx_urb_size = dev->rx_urb_size; 260 261 if (new_mtu <= 0) 262 return -EINVAL; 263 // no second zero-length packet read wanted after mtu-sized packets 264 if ((ll_mtu % dev->maxpacket) == 0) 265 return -EDOM; 266 net->mtu = new_mtu; 267 268 dev->hard_mtu = net->mtu + net->hard_header_len; 269 if (dev->rx_urb_size == old_hard_mtu) { 270 dev->rx_urb_size = dev->hard_mtu; 271 if (dev->rx_urb_size > old_rx_urb_size) 272 usbnet_unlink_rx_urbs(dev); 273 } 274 275 return 0; 276 } 277 EXPORT_SYMBOL_GPL(usbnet_change_mtu); 278 279 /*-------------------------------------------------------------------------*/ 280 281 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from 282 * completion callbacks. 2.5 should have fixed those bugs... 283 */ 284 285 static void defer_bh(struct usbnet *dev, struct sk_buff *skb, struct sk_buff_head *list) 286 { 287 unsigned long flags; 288 289 spin_lock_irqsave(&list->lock, flags); 290 __skb_unlink(skb, list); 291 spin_unlock(&list->lock); 292 spin_lock(&dev->done.lock); 293 __skb_queue_tail(&dev->done, skb); 294 if (dev->done.qlen == 1) 295 tasklet_schedule(&dev->bh); 296 spin_unlock_irqrestore(&dev->done.lock, flags); 297 } 298 299 /* some work can't be done in tasklets, so we use keventd 300 * 301 * NOTE: annoying asymmetry: if it's active, schedule_work() fails, 302 * but tasklet_schedule() doesn't. hope the failure is rare. 303 */ 304 void usbnet_defer_kevent (struct usbnet *dev, int work) 305 { 306 set_bit (work, &dev->flags); 307 if (!schedule_work (&dev->kevent)) 308 netdev_err(dev->net, "kevent %d may have been dropped\n", work); 309 else 310 netdev_dbg(dev->net, "kevent %d scheduled\n", work); 311 } 312 EXPORT_SYMBOL_GPL(usbnet_defer_kevent); 313 314 /*-------------------------------------------------------------------------*/ 315 316 static void rx_complete (struct urb *urb); 317 318 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) 319 { 320 struct sk_buff *skb; 321 struct skb_data *entry; 322 int retval = 0; 323 unsigned long lockflags; 324 size_t size = dev->rx_urb_size; 325 326 if ((skb = alloc_skb (size + NET_IP_ALIGN, flags)) == NULL) { 327 netif_dbg(dev, rx_err, dev->net, "no rx skb\n"); 328 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 329 usb_free_urb (urb); 330 return -ENOMEM; 331 } 332 skb_reserve (skb, NET_IP_ALIGN); 333 334 entry = (struct skb_data *) skb->cb; 335 entry->urb = urb; 336 entry->dev = dev; 337 entry->state = rx_start; 338 entry->length = 0; 339 340 usb_fill_bulk_urb (urb, dev->udev, dev->in, 341 skb->data, size, rx_complete, skb); 342 343 spin_lock_irqsave (&dev->rxq.lock, lockflags); 344 345 if (netif_running (dev->net) && 346 netif_device_present (dev->net) && 347 !test_bit (EVENT_RX_HALT, &dev->flags) && 348 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) { 349 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) { 350 case -EPIPE: 351 usbnet_defer_kevent (dev, EVENT_RX_HALT); 352 break; 353 case -ENOMEM: 354 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 355 break; 356 case -ENODEV: 357 netif_dbg(dev, ifdown, dev->net, "device gone\n"); 358 netif_device_detach (dev->net); 359 break; 360 case -EHOSTUNREACH: 361 retval = -ENOLINK; 362 break; 363 default: 364 netif_dbg(dev, rx_err, dev->net, 365 "rx submit, %d\n", retval); 366 tasklet_schedule (&dev->bh); 367 break; 368 case 0: 369 __skb_queue_tail (&dev->rxq, skb); 370 } 371 } else { 372 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n"); 373 retval = -ENOLINK; 374 } 375 spin_unlock_irqrestore (&dev->rxq.lock, lockflags); 376 if (retval) { 377 dev_kfree_skb_any (skb); 378 usb_free_urb (urb); 379 } 380 return retval; 381 } 382 383 384 /*-------------------------------------------------------------------------*/ 385 386 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb) 387 { 388 if (dev->driver_info->rx_fixup && 389 !dev->driver_info->rx_fixup (dev, skb)) 390 goto error; 391 // else network stack removes extra byte if we forced a short packet 392 393 if (skb->len) 394 usbnet_skb_return (dev, skb); 395 else { 396 netif_dbg(dev, rx_err, dev->net, "drop\n"); 397 error: 398 dev->net->stats.rx_errors++; 399 skb_queue_tail (&dev->done, skb); 400 } 401 } 402 403 /*-------------------------------------------------------------------------*/ 404 405 static void rx_complete (struct urb *urb) 406 { 407 struct sk_buff *skb = (struct sk_buff *) urb->context; 408 struct skb_data *entry = (struct skb_data *) skb->cb; 409 struct usbnet *dev = entry->dev; 410 int urb_status = urb->status; 411 412 skb_put (skb, urb->actual_length); 413 entry->state = rx_done; 414 entry->urb = NULL; 415 416 switch (urb_status) { 417 /* success */ 418 case 0: 419 if (skb->len < dev->net->hard_header_len) { 420 entry->state = rx_cleanup; 421 dev->net->stats.rx_errors++; 422 dev->net->stats.rx_length_errors++; 423 netif_dbg(dev, rx_err, dev->net, 424 "rx length %d\n", skb->len); 425 } 426 break; 427 428 /* stalls need manual reset. this is rare ... except that 429 * when going through USB 2.0 TTs, unplug appears this way. 430 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ 431 * storm, recovering as needed. 432 */ 433 case -EPIPE: 434 dev->net->stats.rx_errors++; 435 usbnet_defer_kevent (dev, EVENT_RX_HALT); 436 // FALLTHROUGH 437 438 /* software-driven interface shutdown */ 439 case -ECONNRESET: /* async unlink */ 440 case -ESHUTDOWN: /* hardware gone */ 441 netif_dbg(dev, ifdown, dev->net, 442 "rx shutdown, code %d\n", urb_status); 443 goto block; 444 445 /* we get controller i/o faults during khubd disconnect() delays. 446 * throttle down resubmits, to avoid log floods; just temporarily, 447 * so we still recover when the fault isn't a khubd delay. 448 */ 449 case -EPROTO: 450 case -ETIME: 451 case -EILSEQ: 452 dev->net->stats.rx_errors++; 453 if (!timer_pending (&dev->delay)) { 454 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); 455 netif_dbg(dev, link, dev->net, 456 "rx throttle %d\n", urb_status); 457 } 458 block: 459 entry->state = rx_cleanup; 460 entry->urb = urb; 461 urb = NULL; 462 break; 463 464 /* data overrun ... flush fifo? */ 465 case -EOVERFLOW: 466 dev->net->stats.rx_over_errors++; 467 // FALLTHROUGH 468 469 default: 470 entry->state = rx_cleanup; 471 dev->net->stats.rx_errors++; 472 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status); 473 break; 474 } 475 476 defer_bh(dev, skb, &dev->rxq); 477 478 if (urb) { 479 if (netif_running (dev->net) && 480 !test_bit (EVENT_RX_HALT, &dev->flags)) { 481 rx_submit (dev, urb, GFP_ATOMIC); 482 return; 483 } 484 usb_free_urb (urb); 485 } 486 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n"); 487 } 488 489 static void intr_complete (struct urb *urb) 490 { 491 struct usbnet *dev = urb->context; 492 int status = urb->status; 493 494 switch (status) { 495 /* success */ 496 case 0: 497 dev->driver_info->status(dev, urb); 498 break; 499 500 /* software-driven interface shutdown */ 501 case -ENOENT: /* urb killed */ 502 case -ESHUTDOWN: /* hardware gone */ 503 netif_dbg(dev, ifdown, dev->net, 504 "intr shutdown, code %d\n", status); 505 return; 506 507 /* NOTE: not throttling like RX/TX, since this endpoint 508 * already polls infrequently 509 */ 510 default: 511 netdev_dbg(dev->net, "intr status %d\n", status); 512 break; 513 } 514 515 if (!netif_running (dev->net)) 516 return; 517 518 memset(urb->transfer_buffer, 0, urb->transfer_buffer_length); 519 status = usb_submit_urb (urb, GFP_ATOMIC); 520 if (status != 0) 521 netif_err(dev, timer, dev->net, 522 "intr resubmit --> %d\n", status); 523 } 524 525 /*-------------------------------------------------------------------------*/ 526 void usbnet_pause_rx(struct usbnet *dev) 527 { 528 set_bit(EVENT_RX_PAUSED, &dev->flags); 529 530 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n"); 531 } 532 EXPORT_SYMBOL_GPL(usbnet_pause_rx); 533 534 void usbnet_resume_rx(struct usbnet *dev) 535 { 536 struct sk_buff *skb; 537 int num = 0; 538 539 clear_bit(EVENT_RX_PAUSED, &dev->flags); 540 541 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) { 542 usbnet_skb_return(dev, skb); 543 num++; 544 } 545 546 tasklet_schedule(&dev->bh); 547 548 netif_dbg(dev, rx_status, dev->net, 549 "paused rx queue disabled, %d skbs requeued\n", num); 550 } 551 EXPORT_SYMBOL_GPL(usbnet_resume_rx); 552 553 void usbnet_purge_paused_rxq(struct usbnet *dev) 554 { 555 skb_queue_purge(&dev->rxq_pause); 556 } 557 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq); 558 559 /*-------------------------------------------------------------------------*/ 560 561 // unlink pending rx/tx; completion handlers do all other cleanup 562 563 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) 564 { 565 unsigned long flags; 566 struct sk_buff *skb, *skbnext; 567 int count = 0; 568 569 spin_lock_irqsave (&q->lock, flags); 570 skb_queue_walk_safe(q, skb, skbnext) { 571 struct skb_data *entry; 572 struct urb *urb; 573 int retval; 574 575 entry = (struct skb_data *) skb->cb; 576 urb = entry->urb; 577 578 // during some PM-driven resume scenarios, 579 // these (async) unlinks complete immediately 580 retval = usb_unlink_urb (urb); 581 if (retval != -EINPROGRESS && retval != 0) 582 netdev_dbg(dev->net, "unlink urb err, %d\n", retval); 583 else 584 count++; 585 } 586 spin_unlock_irqrestore (&q->lock, flags); 587 return count; 588 } 589 590 // Flush all pending rx urbs 591 // minidrivers may need to do this when the MTU changes 592 593 void usbnet_unlink_rx_urbs(struct usbnet *dev) 594 { 595 if (netif_running(dev->net)) { 596 (void) unlink_urbs (dev, &dev->rxq); 597 tasklet_schedule(&dev->bh); 598 } 599 } 600 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); 601 602 /*-------------------------------------------------------------------------*/ 603 604 // precondition: never called in_interrupt 605 static void usbnet_terminate_urbs(struct usbnet *dev) 606 { 607 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup); 608 DECLARE_WAITQUEUE(wait, current); 609 int temp; 610 611 /* ensure there are no more active urbs */ 612 add_wait_queue(&unlink_wakeup, &wait); 613 set_current_state(TASK_UNINTERRUPTIBLE); 614 dev->wait = &unlink_wakeup; 615 temp = unlink_urbs(dev, &dev->txq) + 616 unlink_urbs(dev, &dev->rxq); 617 618 /* maybe wait for deletions to finish. */ 619 while (!skb_queue_empty(&dev->rxq) 620 && !skb_queue_empty(&dev->txq) 621 && !skb_queue_empty(&dev->done)) { 622 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS)); 623 set_current_state(TASK_UNINTERRUPTIBLE); 624 netif_dbg(dev, ifdown, dev->net, 625 "waited for %d urb completions\n", temp); 626 } 627 set_current_state(TASK_RUNNING); 628 dev->wait = NULL; 629 remove_wait_queue(&unlink_wakeup, &wait); 630 } 631 632 int usbnet_stop (struct net_device *net) 633 { 634 struct usbnet *dev = netdev_priv(net); 635 struct driver_info *info = dev->driver_info; 636 int retval; 637 638 netif_stop_queue (net); 639 640 netif_info(dev, ifdown, dev->net, 641 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n", 642 net->stats.rx_packets, net->stats.tx_packets, 643 net->stats.rx_errors, net->stats.tx_errors); 644 645 /* allow minidriver to stop correctly (wireless devices to turn off 646 * radio etc) */ 647 if (info->stop) { 648 retval = info->stop(dev); 649 if (retval < 0) 650 netif_info(dev, ifdown, dev->net, 651 "stop fail (%d) usbnet usb-%s-%s, %s\n", 652 retval, 653 dev->udev->bus->bus_name, dev->udev->devpath, 654 info->description); 655 } 656 657 if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) 658 usbnet_terminate_urbs(dev); 659 660 usb_kill_urb(dev->interrupt); 661 662 usbnet_purge_paused_rxq(dev); 663 664 /* deferred work (task, timer, softirq) must also stop. 665 * can't flush_scheduled_work() until we drop rtnl (later), 666 * else workers could deadlock; so make workers a NOP. 667 */ 668 dev->flags = 0; 669 del_timer_sync (&dev->delay); 670 tasklet_kill (&dev->bh); 671 if (info->manage_power) 672 info->manage_power(dev, 0); 673 else 674 usb_autopm_put_interface(dev->intf); 675 676 return 0; 677 } 678 EXPORT_SYMBOL_GPL(usbnet_stop); 679 680 /*-------------------------------------------------------------------------*/ 681 682 // posts reads, and enables write queuing 683 684 // precondition: never called in_interrupt 685 686 int usbnet_open (struct net_device *net) 687 { 688 struct usbnet *dev = netdev_priv(net); 689 int retval; 690 struct driver_info *info = dev->driver_info; 691 692 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { 693 netif_info(dev, ifup, dev->net, 694 "resumption fail (%d) usbnet usb-%s-%s, %s\n", 695 retval, 696 dev->udev->bus->bus_name, 697 dev->udev->devpath, 698 info->description); 699 goto done_nopm; 700 } 701 702 // put into "known safe" state 703 if (info->reset && (retval = info->reset (dev)) < 0) { 704 netif_info(dev, ifup, dev->net, 705 "open reset fail (%d) usbnet usb-%s-%s, %s\n", 706 retval, 707 dev->udev->bus->bus_name, 708 dev->udev->devpath, 709 info->description); 710 goto done; 711 } 712 713 // insist peer be connected 714 if (info->check_connect && (retval = info->check_connect (dev)) < 0) { 715 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval); 716 goto done; 717 } 718 719 /* start any status interrupt transfer */ 720 if (dev->interrupt) { 721 retval = usb_submit_urb (dev->interrupt, GFP_KERNEL); 722 if (retval < 0) { 723 netif_err(dev, ifup, dev->net, 724 "intr submit %d\n", retval); 725 goto done; 726 } 727 } 728 729 netif_start_queue (net); 730 netif_info(dev, ifup, dev->net, 731 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n", 732 (int)RX_QLEN(dev), (int)TX_QLEN(dev), 733 dev->net->mtu, 734 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" : 735 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" : 736 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" : 737 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" : 738 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" : 739 "simple"); 740 741 // delay posting reads until we're fully open 742 tasklet_schedule (&dev->bh); 743 if (info->manage_power) { 744 retval = info->manage_power(dev, 1); 745 if (retval < 0) 746 goto done; 747 usb_autopm_put_interface(dev->intf); 748 } 749 return retval; 750 751 done: 752 usb_autopm_put_interface(dev->intf); 753 done_nopm: 754 return retval; 755 } 756 EXPORT_SYMBOL_GPL(usbnet_open); 757 758 /*-------------------------------------------------------------------------*/ 759 760 /* ethtool methods; minidrivers may need to add some more, but 761 * they'll probably want to use this base set. 762 */ 763 764 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd) 765 { 766 struct usbnet *dev = netdev_priv(net); 767 768 if (!dev->mii.mdio_read) 769 return -EOPNOTSUPP; 770 771 return mii_ethtool_gset(&dev->mii, cmd); 772 } 773 EXPORT_SYMBOL_GPL(usbnet_get_settings); 774 775 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd) 776 { 777 struct usbnet *dev = netdev_priv(net); 778 int retval; 779 780 if (!dev->mii.mdio_write) 781 return -EOPNOTSUPP; 782 783 retval = mii_ethtool_sset(&dev->mii, cmd); 784 785 /* link speed/duplex might have changed */ 786 if (dev->driver_info->link_reset) 787 dev->driver_info->link_reset(dev); 788 789 return retval; 790 791 } 792 EXPORT_SYMBOL_GPL(usbnet_set_settings); 793 794 u32 usbnet_get_link (struct net_device *net) 795 { 796 struct usbnet *dev = netdev_priv(net); 797 798 /* If a check_connect is defined, return its result */ 799 if (dev->driver_info->check_connect) 800 return dev->driver_info->check_connect (dev) == 0; 801 802 /* if the device has mii operations, use those */ 803 if (dev->mii.mdio_read) 804 return mii_link_ok(&dev->mii); 805 806 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ 807 return ethtool_op_get_link(net); 808 } 809 EXPORT_SYMBOL_GPL(usbnet_get_link); 810 811 int usbnet_nway_reset(struct net_device *net) 812 { 813 struct usbnet *dev = netdev_priv(net); 814 815 if (!dev->mii.mdio_write) 816 return -EOPNOTSUPP; 817 818 return mii_nway_restart(&dev->mii); 819 } 820 EXPORT_SYMBOL_GPL(usbnet_nway_reset); 821 822 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) 823 { 824 struct usbnet *dev = netdev_priv(net); 825 826 strncpy (info->driver, dev->driver_name, sizeof info->driver); 827 strncpy (info->version, DRIVER_VERSION, sizeof info->version); 828 strncpy (info->fw_version, dev->driver_info->description, 829 sizeof info->fw_version); 830 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); 831 } 832 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); 833 834 u32 usbnet_get_msglevel (struct net_device *net) 835 { 836 struct usbnet *dev = netdev_priv(net); 837 838 return dev->msg_enable; 839 } 840 EXPORT_SYMBOL_GPL(usbnet_get_msglevel); 841 842 void usbnet_set_msglevel (struct net_device *net, u32 level) 843 { 844 struct usbnet *dev = netdev_priv(net); 845 846 dev->msg_enable = level; 847 } 848 EXPORT_SYMBOL_GPL(usbnet_set_msglevel); 849 850 /* drivers may override default ethtool_ops in their bind() routine */ 851 static const struct ethtool_ops usbnet_ethtool_ops = { 852 .get_settings = usbnet_get_settings, 853 .set_settings = usbnet_set_settings, 854 .get_link = usbnet_get_link, 855 .nway_reset = usbnet_nway_reset, 856 .get_drvinfo = usbnet_get_drvinfo, 857 .get_msglevel = usbnet_get_msglevel, 858 .set_msglevel = usbnet_set_msglevel, 859 }; 860 861 /*-------------------------------------------------------------------------*/ 862 863 /* work that cannot be done in interrupt context uses keventd. 864 * 865 * NOTE: with 2.5 we could do more of this using completion callbacks, 866 * especially now that control transfers can be queued. 867 */ 868 static void 869 kevent (struct work_struct *work) 870 { 871 struct usbnet *dev = 872 container_of(work, struct usbnet, kevent); 873 int status; 874 875 /* usb_clear_halt() needs a thread context */ 876 if (test_bit (EVENT_TX_HALT, &dev->flags)) { 877 unlink_urbs (dev, &dev->txq); 878 status = usb_autopm_get_interface(dev->intf); 879 if (status < 0) 880 goto fail_pipe; 881 status = usb_clear_halt (dev->udev, dev->out); 882 usb_autopm_put_interface(dev->intf); 883 if (status < 0 && 884 status != -EPIPE && 885 status != -ESHUTDOWN) { 886 if (netif_msg_tx_err (dev)) 887 fail_pipe: 888 netdev_err(dev->net, "can't clear tx halt, status %d\n", 889 status); 890 } else { 891 clear_bit (EVENT_TX_HALT, &dev->flags); 892 if (status != -ESHUTDOWN) 893 netif_wake_queue (dev->net); 894 } 895 } 896 if (test_bit (EVENT_RX_HALT, &dev->flags)) { 897 unlink_urbs (dev, &dev->rxq); 898 status = usb_autopm_get_interface(dev->intf); 899 if (status < 0) 900 goto fail_halt; 901 status = usb_clear_halt (dev->udev, dev->in); 902 usb_autopm_put_interface(dev->intf); 903 if (status < 0 && 904 status != -EPIPE && 905 status != -ESHUTDOWN) { 906 if (netif_msg_rx_err (dev)) 907 fail_halt: 908 netdev_err(dev->net, "can't clear rx halt, status %d\n", 909 status); 910 } else { 911 clear_bit (EVENT_RX_HALT, &dev->flags); 912 tasklet_schedule (&dev->bh); 913 } 914 } 915 916 /* tasklet could resubmit itself forever if memory is tight */ 917 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { 918 struct urb *urb = NULL; 919 int resched = 1; 920 921 if (netif_running (dev->net)) 922 urb = usb_alloc_urb (0, GFP_KERNEL); 923 else 924 clear_bit (EVENT_RX_MEMORY, &dev->flags); 925 if (urb != NULL) { 926 clear_bit (EVENT_RX_MEMORY, &dev->flags); 927 status = usb_autopm_get_interface(dev->intf); 928 if (status < 0) 929 goto fail_lowmem; 930 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) 931 resched = 0; 932 usb_autopm_put_interface(dev->intf); 933 fail_lowmem: 934 if (resched) 935 tasklet_schedule (&dev->bh); 936 } 937 } 938 939 if (test_bit (EVENT_LINK_RESET, &dev->flags)) { 940 struct driver_info *info = dev->driver_info; 941 int retval = 0; 942 943 clear_bit (EVENT_LINK_RESET, &dev->flags); 944 status = usb_autopm_get_interface(dev->intf); 945 if (status < 0) 946 goto skip_reset; 947 if(info->link_reset && (retval = info->link_reset(dev)) < 0) { 948 usb_autopm_put_interface(dev->intf); 949 skip_reset: 950 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", 951 retval, 952 dev->udev->bus->bus_name, 953 dev->udev->devpath, 954 info->description); 955 } else { 956 usb_autopm_put_interface(dev->intf); 957 } 958 } 959 960 if (dev->flags) 961 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); 962 } 963 964 /*-------------------------------------------------------------------------*/ 965 966 static void tx_complete (struct urb *urb) 967 { 968 struct sk_buff *skb = (struct sk_buff *) urb->context; 969 struct skb_data *entry = (struct skb_data *) skb->cb; 970 struct usbnet *dev = entry->dev; 971 972 if (urb->status == 0) { 973 dev->net->stats.tx_packets++; 974 dev->net->stats.tx_bytes += entry->length; 975 } else { 976 dev->net->stats.tx_errors++; 977 978 switch (urb->status) { 979 case -EPIPE: 980 usbnet_defer_kevent (dev, EVENT_TX_HALT); 981 break; 982 983 /* software-driven interface shutdown */ 984 case -ECONNRESET: // async unlink 985 case -ESHUTDOWN: // hardware gone 986 break; 987 988 // like rx, tx gets controller i/o faults during khubd delays 989 // and so it uses the same throttling mechanism. 990 case -EPROTO: 991 case -ETIME: 992 case -EILSEQ: 993 usb_mark_last_busy(dev->udev); 994 if (!timer_pending (&dev->delay)) { 995 mod_timer (&dev->delay, 996 jiffies + THROTTLE_JIFFIES); 997 netif_dbg(dev, link, dev->net, 998 "tx throttle %d\n", urb->status); 999 } 1000 netif_stop_queue (dev->net); 1001 break; 1002 default: 1003 netif_dbg(dev, tx_err, dev->net, 1004 "tx err %d\n", entry->urb->status); 1005 break; 1006 } 1007 } 1008 1009 usb_autopm_put_interface_async(dev->intf); 1010 urb->dev = NULL; 1011 entry->state = tx_done; 1012 defer_bh(dev, skb, &dev->txq); 1013 } 1014 1015 /*-------------------------------------------------------------------------*/ 1016 1017 void usbnet_tx_timeout (struct net_device *net) 1018 { 1019 struct usbnet *dev = netdev_priv(net); 1020 1021 unlink_urbs (dev, &dev->txq); 1022 tasklet_schedule (&dev->bh); 1023 1024 // FIXME: device recovery -- reset? 1025 } 1026 EXPORT_SYMBOL_GPL(usbnet_tx_timeout); 1027 1028 /*-------------------------------------------------------------------------*/ 1029 1030 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, 1031 struct net_device *net) 1032 { 1033 struct usbnet *dev = netdev_priv(net); 1034 int length; 1035 struct urb *urb = NULL; 1036 struct skb_data *entry; 1037 struct driver_info *info = dev->driver_info; 1038 unsigned long flags; 1039 int retval; 1040 1041 // some devices want funky USB-level framing, for 1042 // win32 driver (usually) and/or hardware quirks 1043 if (info->tx_fixup) { 1044 skb = info->tx_fixup (dev, skb, GFP_ATOMIC); 1045 if (!skb) { 1046 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); 1047 goto drop; 1048 } 1049 } 1050 length = skb->len; 1051 1052 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { 1053 netif_dbg(dev, tx_err, dev->net, "no urb\n"); 1054 goto drop; 1055 } 1056 1057 entry = (struct skb_data *) skb->cb; 1058 entry->urb = urb; 1059 entry->dev = dev; 1060 entry->state = tx_start; 1061 entry->length = length; 1062 1063 usb_fill_bulk_urb (urb, dev->udev, dev->out, 1064 skb->data, skb->len, tx_complete, skb); 1065 1066 /* don't assume the hardware handles USB_ZERO_PACKET 1067 * NOTE: strictly conforming cdc-ether devices should expect 1068 * the ZLP here, but ignore the one-byte packet. 1069 */ 1070 if (length % dev->maxpacket == 0) { 1071 if (!(info->flags & FLAG_SEND_ZLP)) { 1072 urb->transfer_buffer_length++; 1073 if (skb_tailroom(skb)) { 1074 skb->data[skb->len] = 0; 1075 __skb_put(skb, 1); 1076 } 1077 } else 1078 urb->transfer_flags |= URB_ZERO_PACKET; 1079 } 1080 1081 spin_lock_irqsave(&dev->txq.lock, flags); 1082 retval = usb_autopm_get_interface_async(dev->intf); 1083 if (retval < 0) { 1084 spin_unlock_irqrestore(&dev->txq.lock, flags); 1085 goto drop; 1086 } 1087 1088 #ifdef CONFIG_PM 1089 /* if this triggers the device is still a sleep */ 1090 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { 1091 /* transmission will be done in resume */ 1092 usb_anchor_urb(urb, &dev->deferred); 1093 /* no use to process more packets */ 1094 netif_stop_queue(net); 1095 spin_unlock_irqrestore(&dev->txq.lock, flags); 1096 netdev_dbg(dev->net, "Delaying transmission for resumption\n"); 1097 goto deferred; 1098 } 1099 #endif 1100 1101 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { 1102 case -EPIPE: 1103 netif_stop_queue (net); 1104 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1105 usb_autopm_put_interface_async(dev->intf); 1106 break; 1107 default: 1108 usb_autopm_put_interface_async(dev->intf); 1109 netif_dbg(dev, tx_err, dev->net, 1110 "tx: submit urb err %d\n", retval); 1111 break; 1112 case 0: 1113 net->trans_start = jiffies; 1114 __skb_queue_tail (&dev->txq, skb); 1115 if (dev->txq.qlen >= TX_QLEN (dev)) 1116 netif_stop_queue (net); 1117 } 1118 spin_unlock_irqrestore (&dev->txq.lock, flags); 1119 1120 if (retval) { 1121 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); 1122 drop: 1123 dev->net->stats.tx_dropped++; 1124 if (skb) 1125 dev_kfree_skb_any (skb); 1126 usb_free_urb (urb); 1127 } else 1128 netif_dbg(dev, tx_queued, dev->net, 1129 "> tx, len %d, type 0x%x\n", length, skb->protocol); 1130 #ifdef CONFIG_PM 1131 deferred: 1132 #endif 1133 return NETDEV_TX_OK; 1134 } 1135 EXPORT_SYMBOL_GPL(usbnet_start_xmit); 1136 1137 /*-------------------------------------------------------------------------*/ 1138 1139 // tasklet (work deferred from completions, in_irq) or timer 1140 1141 static void usbnet_bh (unsigned long param) 1142 { 1143 struct usbnet *dev = (struct usbnet *) param; 1144 struct sk_buff *skb; 1145 struct skb_data *entry; 1146 1147 while ((skb = skb_dequeue (&dev->done))) { 1148 entry = (struct skb_data *) skb->cb; 1149 switch (entry->state) { 1150 case rx_done: 1151 entry->state = rx_cleanup; 1152 rx_process (dev, skb); 1153 continue; 1154 case tx_done: 1155 case rx_cleanup: 1156 usb_free_urb (entry->urb); 1157 dev_kfree_skb (skb); 1158 continue; 1159 default: 1160 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); 1161 } 1162 } 1163 1164 // waiting for all pending urbs to complete? 1165 if (dev->wait) { 1166 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) { 1167 wake_up (dev->wait); 1168 } 1169 1170 // or are we maybe short a few urbs? 1171 } else if (netif_running (dev->net) && 1172 netif_device_present (dev->net) && 1173 !timer_pending (&dev->delay) && 1174 !test_bit (EVENT_RX_HALT, &dev->flags)) { 1175 int temp = dev->rxq.qlen; 1176 int qlen = RX_QLEN (dev); 1177 1178 if (temp < qlen) { 1179 struct urb *urb; 1180 int i; 1181 1182 // don't refill the queue all at once 1183 for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) { 1184 urb = usb_alloc_urb (0, GFP_ATOMIC); 1185 if (urb != NULL) { 1186 if (rx_submit (dev, urb, GFP_ATOMIC) == 1187 -ENOLINK) 1188 return; 1189 } 1190 } 1191 if (temp != dev->rxq.qlen) 1192 netif_dbg(dev, link, dev->net, 1193 "rxqlen %d --> %d\n", 1194 temp, dev->rxq.qlen); 1195 if (dev->rxq.qlen < qlen) 1196 tasklet_schedule (&dev->bh); 1197 } 1198 if (dev->txq.qlen < TX_QLEN (dev)) 1199 netif_wake_queue (dev->net); 1200 } 1201 } 1202 1203 1204 /*------------------------------------------------------------------------- 1205 * 1206 * USB Device Driver support 1207 * 1208 *-------------------------------------------------------------------------*/ 1209 1210 // precondition: never called in_interrupt 1211 1212 void usbnet_disconnect (struct usb_interface *intf) 1213 { 1214 struct usbnet *dev; 1215 struct usb_device *xdev; 1216 struct net_device *net; 1217 1218 dev = usb_get_intfdata(intf); 1219 usb_set_intfdata(intf, NULL); 1220 if (!dev) 1221 return; 1222 1223 xdev = interface_to_usbdev (intf); 1224 1225 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", 1226 intf->dev.driver->name, 1227 xdev->bus->bus_name, xdev->devpath, 1228 dev->driver_info->description); 1229 1230 net = dev->net; 1231 unregister_netdev (net); 1232 1233 /* we don't hold rtnl here ... */ 1234 flush_scheduled_work (); 1235 1236 if (dev->driver_info->unbind) 1237 dev->driver_info->unbind (dev, intf); 1238 1239 free_netdev(net); 1240 usb_put_dev (xdev); 1241 } 1242 EXPORT_SYMBOL_GPL(usbnet_disconnect); 1243 1244 static const struct net_device_ops usbnet_netdev_ops = { 1245 .ndo_open = usbnet_open, 1246 .ndo_stop = usbnet_stop, 1247 .ndo_start_xmit = usbnet_start_xmit, 1248 .ndo_tx_timeout = usbnet_tx_timeout, 1249 .ndo_change_mtu = usbnet_change_mtu, 1250 .ndo_set_mac_address = eth_mac_addr, 1251 .ndo_validate_addr = eth_validate_addr, 1252 }; 1253 1254 /*-------------------------------------------------------------------------*/ 1255 1256 // precondition: never called in_interrupt 1257 1258 static struct device_type wlan_type = { 1259 .name = "wlan", 1260 }; 1261 1262 static struct device_type wwan_type = { 1263 .name = "wwan", 1264 }; 1265 1266 int 1267 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) 1268 { 1269 struct usbnet *dev; 1270 struct net_device *net; 1271 struct usb_host_interface *interface; 1272 struct driver_info *info; 1273 struct usb_device *xdev; 1274 int status; 1275 const char *name; 1276 1277 name = udev->dev.driver->name; 1278 info = (struct driver_info *) prod->driver_info; 1279 if (!info) { 1280 dev_dbg (&udev->dev, "blacklisted by %s\n", name); 1281 return -ENODEV; 1282 } 1283 xdev = interface_to_usbdev (udev); 1284 interface = udev->cur_altsetting; 1285 1286 usb_get_dev (xdev); 1287 1288 status = -ENOMEM; 1289 1290 // set up our own records 1291 net = alloc_etherdev(sizeof(*dev)); 1292 if (!net) { 1293 dbg ("can't kmalloc dev"); 1294 goto out; 1295 } 1296 1297 /* netdev_printk() needs this so do it as early as possible */ 1298 SET_NETDEV_DEV(net, &udev->dev); 1299 1300 dev = netdev_priv(net); 1301 dev->udev = xdev; 1302 dev->intf = udev; 1303 dev->driver_info = info; 1304 dev->driver_name = name; 1305 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV 1306 | NETIF_MSG_PROBE | NETIF_MSG_LINK); 1307 skb_queue_head_init (&dev->rxq); 1308 skb_queue_head_init (&dev->txq); 1309 skb_queue_head_init (&dev->done); 1310 skb_queue_head_init(&dev->rxq_pause); 1311 dev->bh.func = usbnet_bh; 1312 dev->bh.data = (unsigned long) dev; 1313 INIT_WORK (&dev->kevent, kevent); 1314 init_usb_anchor(&dev->deferred); 1315 dev->delay.function = usbnet_bh; 1316 dev->delay.data = (unsigned long) dev; 1317 init_timer (&dev->delay); 1318 mutex_init (&dev->phy_mutex); 1319 1320 dev->net = net; 1321 strcpy (net->name, "usb%d"); 1322 memcpy (net->dev_addr, node_id, sizeof node_id); 1323 1324 /* rx and tx sides can use different message sizes; 1325 * bind() should set rx_urb_size in that case. 1326 */ 1327 dev->hard_mtu = net->mtu + net->hard_header_len; 1328 #if 0 1329 // dma_supported() is deeply broken on almost all architectures 1330 // possible with some EHCI controllers 1331 if (dma_supported (&udev->dev, DMA_BIT_MASK(64))) 1332 net->features |= NETIF_F_HIGHDMA; 1333 #endif 1334 1335 net->netdev_ops = &usbnet_netdev_ops; 1336 net->watchdog_timeo = TX_TIMEOUT_JIFFIES; 1337 net->ethtool_ops = &usbnet_ethtool_ops; 1338 1339 // allow device-specific bind/init procedures 1340 // NOTE net->name still not usable ... 1341 if (info->bind) { 1342 status = info->bind (dev, udev); 1343 if (status < 0) 1344 goto out1; 1345 1346 // heuristic: "usb%d" for links we know are two-host, 1347 // else "eth%d" when there's reasonable doubt. userspace 1348 // can rename the link if it knows better. 1349 if ((dev->driver_info->flags & FLAG_ETHER) != 0 && 1350 (net->dev_addr [0] & 0x02) == 0) 1351 strcpy (net->name, "eth%d"); 1352 /* WLAN devices should always be named "wlan%d" */ 1353 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1354 strcpy(net->name, "wlan%d"); 1355 /* WWAN devices should always be named "wwan%d" */ 1356 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1357 strcpy(net->name, "wwan%d"); 1358 1359 /* maybe the remote can't receive an Ethernet MTU */ 1360 if (net->mtu > (dev->hard_mtu - net->hard_header_len)) 1361 net->mtu = dev->hard_mtu - net->hard_header_len; 1362 } else if (!info->in || !info->out) 1363 status = usbnet_get_endpoints (dev, udev); 1364 else { 1365 dev->in = usb_rcvbulkpipe (xdev, info->in); 1366 dev->out = usb_sndbulkpipe (xdev, info->out); 1367 if (!(info->flags & FLAG_NO_SETINT)) 1368 status = usb_set_interface (xdev, 1369 interface->desc.bInterfaceNumber, 1370 interface->desc.bAlternateSetting); 1371 else 1372 status = 0; 1373 1374 } 1375 if (status >= 0 && dev->status) 1376 status = init_status (dev, udev); 1377 if (status < 0) 1378 goto out3; 1379 1380 if (!dev->rx_urb_size) 1381 dev->rx_urb_size = dev->hard_mtu; 1382 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); 1383 1384 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1385 SET_NETDEV_DEVTYPE(net, &wlan_type); 1386 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1387 SET_NETDEV_DEVTYPE(net, &wwan_type); 1388 1389 status = register_netdev (net); 1390 if (status) 1391 goto out3; 1392 netif_info(dev, probe, dev->net, 1393 "register '%s' at usb-%s-%s, %s, %pM\n", 1394 udev->dev.driver->name, 1395 xdev->bus->bus_name, xdev->devpath, 1396 dev->driver_info->description, 1397 net->dev_addr); 1398 1399 // ok, it's ready to go. 1400 usb_set_intfdata (udev, dev); 1401 1402 netif_device_attach (net); 1403 1404 if (dev->driver_info->flags & FLAG_LINK_INTR) 1405 netif_carrier_off(net); 1406 1407 return 0; 1408 1409 out3: 1410 if (info->unbind) 1411 info->unbind (dev, udev); 1412 out1: 1413 free_netdev(net); 1414 out: 1415 usb_put_dev(xdev); 1416 return status; 1417 } 1418 EXPORT_SYMBOL_GPL(usbnet_probe); 1419 1420 /*-------------------------------------------------------------------------*/ 1421 1422 /* 1423 * suspend the whole driver as soon as the first interface is suspended 1424 * resume only when the last interface is resumed 1425 */ 1426 1427 int usbnet_suspend (struct usb_interface *intf, pm_message_t message) 1428 { 1429 struct usbnet *dev = usb_get_intfdata(intf); 1430 1431 if (!dev->suspend_count++) { 1432 spin_lock_irq(&dev->txq.lock); 1433 /* don't autosuspend while transmitting */ 1434 if (dev->txq.qlen && (message.event & PM_EVENT_AUTO)) { 1435 spin_unlock_irq(&dev->txq.lock); 1436 return -EBUSY; 1437 } else { 1438 set_bit(EVENT_DEV_ASLEEP, &dev->flags); 1439 spin_unlock_irq(&dev->txq.lock); 1440 } 1441 /* 1442 * accelerate emptying of the rx and queues, to avoid 1443 * having everything error out. 1444 */ 1445 netif_device_detach (dev->net); 1446 usbnet_terminate_urbs(dev); 1447 usb_kill_urb(dev->interrupt); 1448 1449 /* 1450 * reattach so runtime management can use and 1451 * wake the device 1452 */ 1453 netif_device_attach (dev->net); 1454 } 1455 return 0; 1456 } 1457 EXPORT_SYMBOL_GPL(usbnet_suspend); 1458 1459 int usbnet_resume (struct usb_interface *intf) 1460 { 1461 struct usbnet *dev = usb_get_intfdata(intf); 1462 struct sk_buff *skb; 1463 struct urb *res; 1464 int retval; 1465 1466 if (!--dev->suspend_count) { 1467 spin_lock_irq(&dev->txq.lock); 1468 while ((res = usb_get_from_anchor(&dev->deferred))) { 1469 1470 skb = (struct sk_buff *)res->context; 1471 retval = usb_submit_urb(res, GFP_ATOMIC); 1472 if (retval < 0) { 1473 dev_kfree_skb_any(skb); 1474 usb_free_urb(res); 1475 usb_autopm_put_interface_async(dev->intf); 1476 } else { 1477 dev->net->trans_start = jiffies; 1478 __skb_queue_tail(&dev->txq, skb); 1479 } 1480 } 1481 1482 smp_mb(); 1483 clear_bit(EVENT_DEV_ASLEEP, &dev->flags); 1484 spin_unlock_irq(&dev->txq.lock); 1485 if (!(dev->txq.qlen >= TX_QLEN(dev))) 1486 netif_start_queue(dev->net); 1487 tasklet_schedule (&dev->bh); 1488 } 1489 return 0; 1490 } 1491 EXPORT_SYMBOL_GPL(usbnet_resume); 1492 1493 1494 /*-------------------------------------------------------------------------*/ 1495 1496 static int __init usbnet_init(void) 1497 { 1498 /* compiler should optimize this out */ 1499 BUILD_BUG_ON (sizeof (((struct sk_buff *)0)->cb) 1500 < sizeof (struct skb_data)); 1501 1502 random_ether_addr(node_id); 1503 return 0; 1504 } 1505 module_init(usbnet_init); 1506 1507 static void __exit usbnet_exit(void) 1508 { 1509 } 1510 module_exit(usbnet_exit); 1511 1512 MODULE_AUTHOR("David Brownell"); 1513 MODULE_DESCRIPTION("USB network driver framework"); 1514 MODULE_LICENSE("GPL"); 1515