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 #include <linux/pm_runtime.h> 49 50 #define DRIVER_VERSION "22-Aug-2005" 51 52 53 /*-------------------------------------------------------------------------*/ 54 55 /* 56 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max. 57 * Several dozen bytes of IPv4 data can fit in two such transactions. 58 * One maximum size Ethernet packet takes twenty four of them. 59 * For high speed, each frame comfortably fits almost 36 max size 60 * Ethernet packets (so queues should be bigger). 61 * 62 * REVISIT qlens should be members of 'struct usbnet'; the goal is to 63 * let the USB host controller be busy for 5msec or more before an irq 64 * is required, under load. Jumbograms change the equation. 65 */ 66 #define RX_MAX_QUEUE_MEMORY (60 * 1518) 67 #define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \ 68 (RX_MAX_QUEUE_MEMORY/(dev)->rx_urb_size) : 4) 69 #define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \ 70 (RX_MAX_QUEUE_MEMORY/(dev)->hard_mtu) : 4) 71 72 // reawaken network queue this soon after stopping; else watchdog barks 73 #define TX_TIMEOUT_JIFFIES (5*HZ) 74 75 // throttle rx/tx briefly after some faults, so khubd might disconnect() 76 // us (it polls at HZ/4 usually) before we report too many false errors. 77 #define THROTTLE_JIFFIES (HZ/8) 78 79 // between wakeups 80 #define UNLINK_TIMEOUT_MS 3 81 82 /*-------------------------------------------------------------------------*/ 83 84 // randomly generated ethernet address 85 static u8 node_id [ETH_ALEN]; 86 87 static const char driver_name [] = "usbnet"; 88 89 /* use ethtool to change the level for any given device */ 90 static int msg_level = -1; 91 module_param (msg_level, int, 0); 92 MODULE_PARM_DESC (msg_level, "Override default message level"); 93 94 /*-------------------------------------------------------------------------*/ 95 96 /* handles CDC Ethernet and many other network "bulk data" interfaces */ 97 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf) 98 { 99 int tmp; 100 struct usb_host_interface *alt = NULL; 101 struct usb_host_endpoint *in = NULL, *out = NULL; 102 struct usb_host_endpoint *status = NULL; 103 104 for (tmp = 0; tmp < intf->num_altsetting; tmp++) { 105 unsigned ep; 106 107 in = out = status = NULL; 108 alt = intf->altsetting + tmp; 109 110 /* take the first altsetting with in-bulk + out-bulk; 111 * remember any status endpoint, just in case; 112 * ignore other endpoints and altsetttings. 113 */ 114 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) { 115 struct usb_host_endpoint *e; 116 int intr = 0; 117 118 e = alt->endpoint + ep; 119 switch (e->desc.bmAttributes) { 120 case USB_ENDPOINT_XFER_INT: 121 if (!usb_endpoint_dir_in(&e->desc)) 122 continue; 123 intr = 1; 124 /* FALLTHROUGH */ 125 case USB_ENDPOINT_XFER_BULK: 126 break; 127 default: 128 continue; 129 } 130 if (usb_endpoint_dir_in(&e->desc)) { 131 if (!intr && !in) 132 in = e; 133 else if (intr && !status) 134 status = e; 135 } else { 136 if (!out) 137 out = e; 138 } 139 } 140 if (in && out) 141 break; 142 } 143 if (!alt || !in || !out) 144 return -EINVAL; 145 146 if (alt->desc.bAlternateSetting != 0 || 147 !(dev->driver_info->flags & FLAG_NO_SETINT)) { 148 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber, 149 alt->desc.bAlternateSetting); 150 if (tmp < 0) 151 return tmp; 152 } 153 154 dev->in = usb_rcvbulkpipe (dev->udev, 155 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 156 dev->out = usb_sndbulkpipe (dev->udev, 157 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 158 dev->status = status; 159 return 0; 160 } 161 EXPORT_SYMBOL_GPL(usbnet_get_endpoints); 162 163 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress) 164 { 165 int tmp, i; 166 unsigned char buf [13]; 167 168 tmp = usb_string(dev->udev, iMACAddress, buf, sizeof buf); 169 if (tmp != 12) { 170 dev_dbg(&dev->udev->dev, 171 "bad MAC string %d fetch, %d\n", iMACAddress, tmp); 172 if (tmp >= 0) 173 tmp = -EINVAL; 174 return tmp; 175 } 176 for (i = tmp = 0; i < 6; i++, tmp += 2) 177 dev->net->dev_addr [i] = 178 (hex_to_bin(buf[tmp]) << 4) + hex_to_bin(buf[tmp + 1]); 179 return 0; 180 } 181 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr); 182 183 static void intr_complete (struct urb *urb); 184 185 static int init_status (struct usbnet *dev, struct usb_interface *intf) 186 { 187 char *buf = NULL; 188 unsigned pipe = 0; 189 unsigned maxp; 190 unsigned period; 191 192 if (!dev->driver_info->status) 193 return 0; 194 195 pipe = usb_rcvintpipe (dev->udev, 196 dev->status->desc.bEndpointAddress 197 & USB_ENDPOINT_NUMBER_MASK); 198 maxp = usb_maxpacket (dev->udev, pipe, 0); 199 200 /* avoid 1 msec chatter: min 8 msec poll rate */ 201 period = max ((int) dev->status->desc.bInterval, 202 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3); 203 204 buf = kmalloc (maxp, GFP_KERNEL); 205 if (buf) { 206 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL); 207 if (!dev->interrupt) { 208 kfree (buf); 209 return -ENOMEM; 210 } else { 211 usb_fill_int_urb(dev->interrupt, dev->udev, pipe, 212 buf, maxp, intr_complete, dev, period); 213 dev_dbg(&intf->dev, 214 "status ep%din, %d bytes period %d\n", 215 usb_pipeendpoint(pipe), maxp, period); 216 } 217 } 218 return 0; 219 } 220 221 /* Passes this packet up the stack, updating its accounting. 222 * Some link protocols batch packets, so their rx_fixup paths 223 * can return clones as well as just modify the original skb. 224 */ 225 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb) 226 { 227 int status; 228 229 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) { 230 skb_queue_tail(&dev->rxq_pause, skb); 231 return; 232 } 233 234 skb->protocol = eth_type_trans (skb, dev->net); 235 dev->net->stats.rx_packets++; 236 dev->net->stats.rx_bytes += skb->len; 237 238 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n", 239 skb->len + sizeof (struct ethhdr), skb->protocol); 240 memset (skb->cb, 0, sizeof (struct skb_data)); 241 status = netif_rx (skb); 242 if (status != NET_RX_SUCCESS) 243 netif_dbg(dev, rx_err, dev->net, 244 "netif_rx status %d\n", status); 245 } 246 EXPORT_SYMBOL_GPL(usbnet_skb_return); 247 248 249 /*------------------------------------------------------------------------- 250 * 251 * Network Device Driver (peer link to "Host Device", from USB host) 252 * 253 *-------------------------------------------------------------------------*/ 254 255 int usbnet_change_mtu (struct net_device *net, int new_mtu) 256 { 257 struct usbnet *dev = netdev_priv(net); 258 int ll_mtu = new_mtu + net->hard_header_len; 259 int old_hard_mtu = dev->hard_mtu; 260 int old_rx_urb_size = dev->rx_urb_size; 261 262 if (new_mtu <= 0) 263 return -EINVAL; 264 // no second zero-length packet read wanted after mtu-sized packets 265 if ((ll_mtu % dev->maxpacket) == 0) 266 return -EDOM; 267 net->mtu = new_mtu; 268 269 dev->hard_mtu = net->mtu + net->hard_header_len; 270 if (dev->rx_urb_size == old_hard_mtu) { 271 dev->rx_urb_size = dev->hard_mtu; 272 if (dev->rx_urb_size > old_rx_urb_size) 273 usbnet_unlink_rx_urbs(dev); 274 } 275 276 return 0; 277 } 278 EXPORT_SYMBOL_GPL(usbnet_change_mtu); 279 280 /*-------------------------------------------------------------------------*/ 281 282 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from 283 * completion callbacks. 2.5 should have fixed those bugs... 284 */ 285 286 static void defer_bh(struct usbnet *dev, struct sk_buff *skb, struct sk_buff_head *list) 287 { 288 unsigned long flags; 289 290 spin_lock_irqsave(&list->lock, flags); 291 __skb_unlink(skb, list); 292 spin_unlock(&list->lock); 293 spin_lock(&dev->done.lock); 294 __skb_queue_tail(&dev->done, skb); 295 if (dev->done.qlen == 1) 296 tasklet_schedule(&dev->bh); 297 spin_unlock_irqrestore(&dev->done.lock, flags); 298 } 299 300 /* some work can't be done in tasklets, so we use keventd 301 * 302 * NOTE: annoying asymmetry: if it's active, schedule_work() fails, 303 * but tasklet_schedule() doesn't. hope the failure is rare. 304 */ 305 void usbnet_defer_kevent (struct usbnet *dev, int work) 306 { 307 set_bit (work, &dev->flags); 308 if (!schedule_work (&dev->kevent)) 309 netdev_err(dev->net, "kevent %d may have been dropped\n", work); 310 else 311 netdev_dbg(dev->net, "kevent %d scheduled\n", work); 312 } 313 EXPORT_SYMBOL_GPL(usbnet_defer_kevent); 314 315 /*-------------------------------------------------------------------------*/ 316 317 static void rx_complete (struct urb *urb); 318 319 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) 320 { 321 struct sk_buff *skb; 322 struct skb_data *entry; 323 int retval = 0; 324 unsigned long lockflags; 325 size_t size = dev->rx_urb_size; 326 327 if ((skb = alloc_skb (size + NET_IP_ALIGN, flags)) == NULL) { 328 netif_dbg(dev, rx_err, dev->net, "no rx skb\n"); 329 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 330 usb_free_urb (urb); 331 return -ENOMEM; 332 } 333 skb_reserve (skb, NET_IP_ALIGN); 334 335 entry = (struct skb_data *) skb->cb; 336 entry->urb = urb; 337 entry->dev = dev; 338 entry->state = rx_start; 339 entry->length = 0; 340 341 usb_fill_bulk_urb (urb, dev->udev, dev->in, 342 skb->data, size, rx_complete, skb); 343 344 spin_lock_irqsave (&dev->rxq.lock, lockflags); 345 346 if (netif_running (dev->net) && 347 netif_device_present (dev->net) && 348 !test_bit (EVENT_RX_HALT, &dev->flags) && 349 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) { 350 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) { 351 case -EPIPE: 352 usbnet_defer_kevent (dev, EVENT_RX_HALT); 353 break; 354 case -ENOMEM: 355 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 356 break; 357 case -ENODEV: 358 netif_dbg(dev, ifdown, dev->net, "device gone\n"); 359 netif_device_detach (dev->net); 360 break; 361 case -EHOSTUNREACH: 362 retval = -ENOLINK; 363 break; 364 default: 365 netif_dbg(dev, rx_err, dev->net, 366 "rx submit, %d\n", retval); 367 tasklet_schedule (&dev->bh); 368 break; 369 case 0: 370 __skb_queue_tail (&dev->rxq, skb); 371 } 372 } else { 373 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n"); 374 retval = -ENOLINK; 375 } 376 spin_unlock_irqrestore (&dev->rxq.lock, lockflags); 377 if (retval) { 378 dev_kfree_skb_any (skb); 379 usb_free_urb (urb); 380 } 381 return retval; 382 } 383 384 385 /*-------------------------------------------------------------------------*/ 386 387 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb) 388 { 389 if (dev->driver_info->rx_fixup && 390 !dev->driver_info->rx_fixup (dev, skb)) 391 goto error; 392 // else network stack removes extra byte if we forced a short packet 393 394 if (skb->len) 395 usbnet_skb_return (dev, skb); 396 else { 397 netif_dbg(dev, rx_err, dev->net, "drop\n"); 398 error: 399 dev->net->stats.rx_errors++; 400 skb_queue_tail (&dev->done, skb); 401 } 402 } 403 404 /*-------------------------------------------------------------------------*/ 405 406 static void rx_complete (struct urb *urb) 407 { 408 struct sk_buff *skb = (struct sk_buff *) urb->context; 409 struct skb_data *entry = (struct skb_data *) skb->cb; 410 struct usbnet *dev = entry->dev; 411 int urb_status = urb->status; 412 413 skb_put (skb, urb->actual_length); 414 entry->state = rx_done; 415 entry->urb = NULL; 416 417 switch (urb_status) { 418 /* success */ 419 case 0: 420 if (skb->len < dev->net->hard_header_len) { 421 entry->state = rx_cleanup; 422 dev->net->stats.rx_errors++; 423 dev->net->stats.rx_length_errors++; 424 netif_dbg(dev, rx_err, dev->net, 425 "rx length %d\n", skb->len); 426 } 427 break; 428 429 /* stalls need manual reset. this is rare ... except that 430 * when going through USB 2.0 TTs, unplug appears this way. 431 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ 432 * storm, recovering as needed. 433 */ 434 case -EPIPE: 435 dev->net->stats.rx_errors++; 436 usbnet_defer_kevent (dev, EVENT_RX_HALT); 437 // FALLTHROUGH 438 439 /* software-driven interface shutdown */ 440 case -ECONNRESET: /* async unlink */ 441 case -ESHUTDOWN: /* hardware gone */ 442 netif_dbg(dev, ifdown, dev->net, 443 "rx shutdown, code %d\n", urb_status); 444 goto block; 445 446 /* we get controller i/o faults during khubd disconnect() delays. 447 * throttle down resubmits, to avoid log floods; just temporarily, 448 * so we still recover when the fault isn't a khubd delay. 449 */ 450 case -EPROTO: 451 case -ETIME: 452 case -EILSEQ: 453 dev->net->stats.rx_errors++; 454 if (!timer_pending (&dev->delay)) { 455 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); 456 netif_dbg(dev, link, dev->net, 457 "rx throttle %d\n", urb_status); 458 } 459 block: 460 entry->state = rx_cleanup; 461 entry->urb = urb; 462 urb = NULL; 463 break; 464 465 /* data overrun ... flush fifo? */ 466 case -EOVERFLOW: 467 dev->net->stats.rx_over_errors++; 468 // FALLTHROUGH 469 470 default: 471 entry->state = rx_cleanup; 472 dev->net->stats.rx_errors++; 473 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status); 474 break; 475 } 476 477 defer_bh(dev, skb, &dev->rxq); 478 479 if (urb) { 480 if (netif_running (dev->net) && 481 !test_bit (EVENT_RX_HALT, &dev->flags)) { 482 rx_submit (dev, urb, GFP_ATOMIC); 483 return; 484 } 485 usb_free_urb (urb); 486 } 487 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n"); 488 } 489 490 static void intr_complete (struct urb *urb) 491 { 492 struct usbnet *dev = urb->context; 493 int status = urb->status; 494 495 switch (status) { 496 /* success */ 497 case 0: 498 dev->driver_info->status(dev, urb); 499 break; 500 501 /* software-driven interface shutdown */ 502 case -ENOENT: /* urb killed */ 503 case -ESHUTDOWN: /* hardware gone */ 504 netif_dbg(dev, ifdown, dev->net, 505 "intr shutdown, code %d\n", status); 506 return; 507 508 /* NOTE: not throttling like RX/TX, since this endpoint 509 * already polls infrequently 510 */ 511 default: 512 netdev_dbg(dev->net, "intr status %d\n", status); 513 break; 514 } 515 516 if (!netif_running (dev->net)) 517 return; 518 519 memset(urb->transfer_buffer, 0, urb->transfer_buffer_length); 520 status = usb_submit_urb (urb, GFP_ATOMIC); 521 if (status != 0) 522 netif_err(dev, timer, dev->net, 523 "intr resubmit --> %d\n", status); 524 } 525 526 /*-------------------------------------------------------------------------*/ 527 void usbnet_pause_rx(struct usbnet *dev) 528 { 529 set_bit(EVENT_RX_PAUSED, &dev->flags); 530 531 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n"); 532 } 533 EXPORT_SYMBOL_GPL(usbnet_pause_rx); 534 535 void usbnet_resume_rx(struct usbnet *dev) 536 { 537 struct sk_buff *skb; 538 int num = 0; 539 540 clear_bit(EVENT_RX_PAUSED, &dev->flags); 541 542 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) { 543 usbnet_skb_return(dev, skb); 544 num++; 545 } 546 547 tasklet_schedule(&dev->bh); 548 549 netif_dbg(dev, rx_status, dev->net, 550 "paused rx queue disabled, %d skbs requeued\n", num); 551 } 552 EXPORT_SYMBOL_GPL(usbnet_resume_rx); 553 554 void usbnet_purge_paused_rxq(struct usbnet *dev) 555 { 556 skb_queue_purge(&dev->rxq_pause); 557 } 558 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq); 559 560 /*-------------------------------------------------------------------------*/ 561 562 // unlink pending rx/tx; completion handlers do all other cleanup 563 564 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) 565 { 566 unsigned long flags; 567 struct sk_buff *skb, *skbnext; 568 int count = 0; 569 570 spin_lock_irqsave (&q->lock, flags); 571 skb_queue_walk_safe(q, skb, skbnext) { 572 struct skb_data *entry; 573 struct urb *urb; 574 int retval; 575 576 entry = (struct skb_data *) skb->cb; 577 urb = entry->urb; 578 579 // during some PM-driven resume scenarios, 580 // these (async) unlinks complete immediately 581 retval = usb_unlink_urb (urb); 582 if (retval != -EINPROGRESS && retval != 0) 583 netdev_dbg(dev->net, "unlink urb err, %d\n", retval); 584 else 585 count++; 586 } 587 spin_unlock_irqrestore (&q->lock, flags); 588 return count; 589 } 590 591 // Flush all pending rx urbs 592 // minidrivers may need to do this when the MTU changes 593 594 void usbnet_unlink_rx_urbs(struct usbnet *dev) 595 { 596 if (netif_running(dev->net)) { 597 (void) unlink_urbs (dev, &dev->rxq); 598 tasklet_schedule(&dev->bh); 599 } 600 } 601 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); 602 603 /*-------------------------------------------------------------------------*/ 604 605 // precondition: never called in_interrupt 606 static void usbnet_terminate_urbs(struct usbnet *dev) 607 { 608 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup); 609 DECLARE_WAITQUEUE(wait, current); 610 int temp; 611 612 /* ensure there are no more active urbs */ 613 add_wait_queue(&unlink_wakeup, &wait); 614 set_current_state(TASK_UNINTERRUPTIBLE); 615 dev->wait = &unlink_wakeup; 616 temp = unlink_urbs(dev, &dev->txq) + 617 unlink_urbs(dev, &dev->rxq); 618 619 /* maybe wait for deletions to finish. */ 620 while (!skb_queue_empty(&dev->rxq) 621 && !skb_queue_empty(&dev->txq) 622 && !skb_queue_empty(&dev->done)) { 623 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS)); 624 set_current_state(TASK_UNINTERRUPTIBLE); 625 netif_dbg(dev, ifdown, dev->net, 626 "waited for %d urb completions\n", temp); 627 } 628 set_current_state(TASK_RUNNING); 629 dev->wait = NULL; 630 remove_wait_queue(&unlink_wakeup, &wait); 631 } 632 633 int usbnet_stop (struct net_device *net) 634 { 635 struct usbnet *dev = netdev_priv(net); 636 struct driver_info *info = dev->driver_info; 637 int retval; 638 639 netif_stop_queue (net); 640 641 netif_info(dev, ifdown, dev->net, 642 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n", 643 net->stats.rx_packets, net->stats.tx_packets, 644 net->stats.rx_errors, net->stats.tx_errors); 645 646 /* allow minidriver to stop correctly (wireless devices to turn off 647 * radio etc) */ 648 if (info->stop) { 649 retval = info->stop(dev); 650 if (retval < 0) 651 netif_info(dev, ifdown, dev->net, 652 "stop fail (%d) usbnet usb-%s-%s, %s\n", 653 retval, 654 dev->udev->bus->bus_name, dev->udev->devpath, 655 info->description); 656 } 657 658 if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) 659 usbnet_terminate_urbs(dev); 660 661 usb_kill_urb(dev->interrupt); 662 663 usbnet_purge_paused_rxq(dev); 664 665 /* deferred work (task, timer, softirq) must also stop. 666 * can't flush_scheduled_work() until we drop rtnl (later), 667 * else workers could deadlock; so make workers a NOP. 668 */ 669 dev->flags = 0; 670 del_timer_sync (&dev->delay); 671 tasklet_kill (&dev->bh); 672 if (info->manage_power) 673 info->manage_power(dev, 0); 674 else 675 usb_autopm_put_interface(dev->intf); 676 677 return 0; 678 } 679 EXPORT_SYMBOL_GPL(usbnet_stop); 680 681 /*-------------------------------------------------------------------------*/ 682 683 // posts reads, and enables write queuing 684 685 // precondition: never called in_interrupt 686 687 int usbnet_open (struct net_device *net) 688 { 689 struct usbnet *dev = netdev_priv(net); 690 int retval; 691 struct driver_info *info = dev->driver_info; 692 693 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { 694 netif_info(dev, ifup, dev->net, 695 "resumption fail (%d) usbnet usb-%s-%s, %s\n", 696 retval, 697 dev->udev->bus->bus_name, 698 dev->udev->devpath, 699 info->description); 700 goto done_nopm; 701 } 702 703 // put into "known safe" state 704 if (info->reset && (retval = info->reset (dev)) < 0) { 705 netif_info(dev, ifup, dev->net, 706 "open reset fail (%d) usbnet usb-%s-%s, %s\n", 707 retval, 708 dev->udev->bus->bus_name, 709 dev->udev->devpath, 710 info->description); 711 goto done; 712 } 713 714 // insist peer be connected 715 if (info->check_connect && (retval = info->check_connect (dev)) < 0) { 716 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval); 717 goto done; 718 } 719 720 /* start any status interrupt transfer */ 721 if (dev->interrupt) { 722 retval = usb_submit_urb (dev->interrupt, GFP_KERNEL); 723 if (retval < 0) { 724 netif_err(dev, ifup, dev->net, 725 "intr submit %d\n", retval); 726 goto done; 727 } 728 } 729 730 netif_start_queue (net); 731 netif_info(dev, ifup, dev->net, 732 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n", 733 (int)RX_QLEN(dev), (int)TX_QLEN(dev), 734 dev->net->mtu, 735 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" : 736 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" : 737 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" : 738 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" : 739 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" : 740 "simple"); 741 742 // delay posting reads until we're fully open 743 tasklet_schedule (&dev->bh); 744 if (info->manage_power) { 745 retval = info->manage_power(dev, 1); 746 if (retval < 0) 747 goto done; 748 usb_autopm_put_interface(dev->intf); 749 } 750 return retval; 751 752 done: 753 usb_autopm_put_interface(dev->intf); 754 done_nopm: 755 return retval; 756 } 757 EXPORT_SYMBOL_GPL(usbnet_open); 758 759 /*-------------------------------------------------------------------------*/ 760 761 /* ethtool methods; minidrivers may need to add some more, but 762 * they'll probably want to use this base set. 763 */ 764 765 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd) 766 { 767 struct usbnet *dev = netdev_priv(net); 768 769 if (!dev->mii.mdio_read) 770 return -EOPNOTSUPP; 771 772 return mii_ethtool_gset(&dev->mii, cmd); 773 } 774 EXPORT_SYMBOL_GPL(usbnet_get_settings); 775 776 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd) 777 { 778 struct usbnet *dev = netdev_priv(net); 779 int retval; 780 781 if (!dev->mii.mdio_write) 782 return -EOPNOTSUPP; 783 784 retval = mii_ethtool_sset(&dev->mii, cmd); 785 786 /* link speed/duplex might have changed */ 787 if (dev->driver_info->link_reset) 788 dev->driver_info->link_reset(dev); 789 790 return retval; 791 792 } 793 EXPORT_SYMBOL_GPL(usbnet_set_settings); 794 795 u32 usbnet_get_link (struct net_device *net) 796 { 797 struct usbnet *dev = netdev_priv(net); 798 799 /* If a check_connect is defined, return its result */ 800 if (dev->driver_info->check_connect) 801 return dev->driver_info->check_connect (dev) == 0; 802 803 /* if the device has mii operations, use those */ 804 if (dev->mii.mdio_read) 805 return mii_link_ok(&dev->mii); 806 807 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ 808 return ethtool_op_get_link(net); 809 } 810 EXPORT_SYMBOL_GPL(usbnet_get_link); 811 812 int usbnet_nway_reset(struct net_device *net) 813 { 814 struct usbnet *dev = netdev_priv(net); 815 816 if (!dev->mii.mdio_write) 817 return -EOPNOTSUPP; 818 819 return mii_nway_restart(&dev->mii); 820 } 821 EXPORT_SYMBOL_GPL(usbnet_nway_reset); 822 823 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) 824 { 825 struct usbnet *dev = netdev_priv(net); 826 827 strncpy (info->driver, dev->driver_name, sizeof info->driver); 828 strncpy (info->version, DRIVER_VERSION, sizeof info->version); 829 strncpy (info->fw_version, dev->driver_info->description, 830 sizeof info->fw_version); 831 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); 832 } 833 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); 834 835 u32 usbnet_get_msglevel (struct net_device *net) 836 { 837 struct usbnet *dev = netdev_priv(net); 838 839 return dev->msg_enable; 840 } 841 EXPORT_SYMBOL_GPL(usbnet_get_msglevel); 842 843 void usbnet_set_msglevel (struct net_device *net, u32 level) 844 { 845 struct usbnet *dev = netdev_priv(net); 846 847 dev->msg_enable = level; 848 } 849 EXPORT_SYMBOL_GPL(usbnet_set_msglevel); 850 851 /* drivers may override default ethtool_ops in their bind() routine */ 852 static const struct ethtool_ops usbnet_ethtool_ops = { 853 .get_settings = usbnet_get_settings, 854 .set_settings = usbnet_set_settings, 855 .get_link = usbnet_get_link, 856 .nway_reset = usbnet_nway_reset, 857 .get_drvinfo = usbnet_get_drvinfo, 858 .get_msglevel = usbnet_get_msglevel, 859 .set_msglevel = usbnet_set_msglevel, 860 }; 861 862 /*-------------------------------------------------------------------------*/ 863 864 /* work that cannot be done in interrupt context uses keventd. 865 * 866 * NOTE: with 2.5 we could do more of this using completion callbacks, 867 * especially now that control transfers can be queued. 868 */ 869 static void 870 kevent (struct work_struct *work) 871 { 872 struct usbnet *dev = 873 container_of(work, struct usbnet, kevent); 874 int status; 875 876 /* usb_clear_halt() needs a thread context */ 877 if (test_bit (EVENT_TX_HALT, &dev->flags)) { 878 unlink_urbs (dev, &dev->txq); 879 status = usb_autopm_get_interface(dev->intf); 880 if (status < 0) 881 goto fail_pipe; 882 status = usb_clear_halt (dev->udev, dev->out); 883 usb_autopm_put_interface(dev->intf); 884 if (status < 0 && 885 status != -EPIPE && 886 status != -ESHUTDOWN) { 887 if (netif_msg_tx_err (dev)) 888 fail_pipe: 889 netdev_err(dev->net, "can't clear tx halt, status %d\n", 890 status); 891 } else { 892 clear_bit (EVENT_TX_HALT, &dev->flags); 893 if (status != -ESHUTDOWN) 894 netif_wake_queue (dev->net); 895 } 896 } 897 if (test_bit (EVENT_RX_HALT, &dev->flags)) { 898 unlink_urbs (dev, &dev->rxq); 899 status = usb_autopm_get_interface(dev->intf); 900 if (status < 0) 901 goto fail_halt; 902 status = usb_clear_halt (dev->udev, dev->in); 903 usb_autopm_put_interface(dev->intf); 904 if (status < 0 && 905 status != -EPIPE && 906 status != -ESHUTDOWN) { 907 if (netif_msg_rx_err (dev)) 908 fail_halt: 909 netdev_err(dev->net, "can't clear rx halt, status %d\n", 910 status); 911 } else { 912 clear_bit (EVENT_RX_HALT, &dev->flags); 913 tasklet_schedule (&dev->bh); 914 } 915 } 916 917 /* tasklet could resubmit itself forever if memory is tight */ 918 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { 919 struct urb *urb = NULL; 920 int resched = 1; 921 922 if (netif_running (dev->net)) 923 urb = usb_alloc_urb (0, GFP_KERNEL); 924 else 925 clear_bit (EVENT_RX_MEMORY, &dev->flags); 926 if (urb != NULL) { 927 clear_bit (EVENT_RX_MEMORY, &dev->flags); 928 status = usb_autopm_get_interface(dev->intf); 929 if (status < 0) 930 goto fail_lowmem; 931 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) 932 resched = 0; 933 usb_autopm_put_interface(dev->intf); 934 fail_lowmem: 935 if (resched) 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 (length % dev->maxpacket == 0) { 1072 if (!(info->flags & FLAG_SEND_ZLP)) { 1073 urb->transfer_buffer_length++; 1074 if (skb_tailroom(skb)) { 1075 skb->data[skb->len] = 0; 1076 __skb_put(skb, 1); 1077 } 1078 } else 1079 urb->transfer_flags |= URB_ZERO_PACKET; 1080 } 1081 1082 spin_lock_irqsave(&dev->txq.lock, flags); 1083 retval = usb_autopm_get_interface_async(dev->intf); 1084 if (retval < 0) { 1085 spin_unlock_irqrestore(&dev->txq.lock, flags); 1086 goto drop; 1087 } 1088 1089 #ifdef CONFIG_PM 1090 /* if this triggers the device is still a sleep */ 1091 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { 1092 /* transmission will be done in resume */ 1093 usb_anchor_urb(urb, &dev->deferred); 1094 /* no use to process more packets */ 1095 netif_stop_queue(net); 1096 spin_unlock_irqrestore(&dev->txq.lock, flags); 1097 netdev_dbg(dev->net, "Delaying transmission for resumption\n"); 1098 goto deferred; 1099 } 1100 #endif 1101 1102 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { 1103 case -EPIPE: 1104 netif_stop_queue (net); 1105 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1106 usb_autopm_put_interface_async(dev->intf); 1107 break; 1108 default: 1109 usb_autopm_put_interface_async(dev->intf); 1110 netif_dbg(dev, tx_err, dev->net, 1111 "tx: submit urb err %d\n", retval); 1112 break; 1113 case 0: 1114 net->trans_start = jiffies; 1115 __skb_queue_tail (&dev->txq, skb); 1116 if (dev->txq.qlen >= TX_QLEN (dev)) 1117 netif_stop_queue (net); 1118 } 1119 spin_unlock_irqrestore (&dev->txq.lock, flags); 1120 1121 if (retval) { 1122 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); 1123 drop: 1124 dev->net->stats.tx_dropped++; 1125 if (skb) 1126 dev_kfree_skb_any (skb); 1127 usb_free_urb (urb); 1128 } else 1129 netif_dbg(dev, tx_queued, dev->net, 1130 "> tx, len %d, type 0x%x\n", length, skb->protocol); 1131 #ifdef CONFIG_PM 1132 deferred: 1133 #endif 1134 return NETDEV_TX_OK; 1135 } 1136 EXPORT_SYMBOL_GPL(usbnet_start_xmit); 1137 1138 /*-------------------------------------------------------------------------*/ 1139 1140 // tasklet (work deferred from completions, in_irq) or timer 1141 1142 static void usbnet_bh (unsigned long param) 1143 { 1144 struct usbnet *dev = (struct usbnet *) param; 1145 struct sk_buff *skb; 1146 struct skb_data *entry; 1147 1148 while ((skb = skb_dequeue (&dev->done))) { 1149 entry = (struct skb_data *) skb->cb; 1150 switch (entry->state) { 1151 case rx_done: 1152 entry->state = rx_cleanup; 1153 rx_process (dev, skb); 1154 continue; 1155 case tx_done: 1156 case rx_cleanup: 1157 usb_free_urb (entry->urb); 1158 dev_kfree_skb (skb); 1159 continue; 1160 default: 1161 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); 1162 } 1163 } 1164 1165 // waiting for all pending urbs to complete? 1166 if (dev->wait) { 1167 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) { 1168 wake_up (dev->wait); 1169 } 1170 1171 // or are we maybe short a few urbs? 1172 } else if (netif_running (dev->net) && 1173 netif_device_present (dev->net) && 1174 !timer_pending (&dev->delay) && 1175 !test_bit (EVENT_RX_HALT, &dev->flags)) { 1176 int temp = dev->rxq.qlen; 1177 int qlen = RX_QLEN (dev); 1178 1179 if (temp < qlen) { 1180 struct urb *urb; 1181 int i; 1182 1183 // don't refill the queue all at once 1184 for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) { 1185 urb = usb_alloc_urb (0, GFP_ATOMIC); 1186 if (urb != NULL) { 1187 if (rx_submit (dev, urb, GFP_ATOMIC) == 1188 -ENOLINK) 1189 return; 1190 } 1191 } 1192 if (temp != dev->rxq.qlen) 1193 netif_dbg(dev, link, dev->net, 1194 "rxqlen %d --> %d\n", 1195 temp, dev->rxq.qlen); 1196 if (dev->rxq.qlen < qlen) 1197 tasklet_schedule (&dev->bh); 1198 } 1199 if (dev->txq.qlen < TX_QLEN (dev)) 1200 netif_wake_queue (dev->net); 1201 } 1202 } 1203 1204 1205 /*------------------------------------------------------------------------- 1206 * 1207 * USB Device Driver support 1208 * 1209 *-------------------------------------------------------------------------*/ 1210 1211 // precondition: never called in_interrupt 1212 1213 void usbnet_disconnect (struct usb_interface *intf) 1214 { 1215 struct usbnet *dev; 1216 struct usb_device *xdev; 1217 struct net_device *net; 1218 1219 dev = usb_get_intfdata(intf); 1220 usb_set_intfdata(intf, NULL); 1221 if (!dev) 1222 return; 1223 1224 xdev = interface_to_usbdev (intf); 1225 1226 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", 1227 intf->dev.driver->name, 1228 xdev->bus->bus_name, xdev->devpath, 1229 dev->driver_info->description); 1230 1231 net = dev->net; 1232 unregister_netdev (net); 1233 1234 /* we don't hold rtnl here ... */ 1235 flush_scheduled_work (); 1236 1237 if (dev->driver_info->unbind) 1238 dev->driver_info->unbind (dev, intf); 1239 1240 free_netdev(net); 1241 usb_put_dev (xdev); 1242 } 1243 EXPORT_SYMBOL_GPL(usbnet_disconnect); 1244 1245 static const struct net_device_ops usbnet_netdev_ops = { 1246 .ndo_open = usbnet_open, 1247 .ndo_stop = usbnet_stop, 1248 .ndo_start_xmit = usbnet_start_xmit, 1249 .ndo_tx_timeout = usbnet_tx_timeout, 1250 .ndo_change_mtu = usbnet_change_mtu, 1251 .ndo_set_mac_address = eth_mac_addr, 1252 .ndo_validate_addr = eth_validate_addr, 1253 }; 1254 1255 /*-------------------------------------------------------------------------*/ 1256 1257 // precondition: never called in_interrupt 1258 1259 static struct device_type wlan_type = { 1260 .name = "wlan", 1261 }; 1262 1263 static struct device_type wwan_type = { 1264 .name = "wwan", 1265 }; 1266 1267 int 1268 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) 1269 { 1270 struct usbnet *dev; 1271 struct net_device *net; 1272 struct usb_host_interface *interface; 1273 struct driver_info *info; 1274 struct usb_device *xdev; 1275 int status; 1276 const char *name; 1277 struct usb_driver *driver = to_usb_driver(udev->dev.driver); 1278 1279 /* usbnet already took usb runtime pm, so have to enable the feature 1280 * for usb interface, otherwise usb_autopm_get_interface may return 1281 * failure if USB_SUSPEND(RUNTIME_PM) is enabled. 1282 */ 1283 if (!driver->supports_autosuspend) { 1284 driver->supports_autosuspend = 1; 1285 pm_runtime_enable(&udev->dev); 1286 } 1287 1288 name = udev->dev.driver->name; 1289 info = (struct driver_info *) prod->driver_info; 1290 if (!info) { 1291 dev_dbg (&udev->dev, "blacklisted by %s\n", name); 1292 return -ENODEV; 1293 } 1294 xdev = interface_to_usbdev (udev); 1295 interface = udev->cur_altsetting; 1296 1297 usb_get_dev (xdev); 1298 1299 status = -ENOMEM; 1300 1301 // set up our own records 1302 net = alloc_etherdev(sizeof(*dev)); 1303 if (!net) { 1304 dbg ("can't kmalloc dev"); 1305 goto out; 1306 } 1307 1308 /* netdev_printk() needs this so do it as early as possible */ 1309 SET_NETDEV_DEV(net, &udev->dev); 1310 1311 dev = netdev_priv(net); 1312 dev->udev = xdev; 1313 dev->intf = udev; 1314 dev->driver_info = info; 1315 dev->driver_name = name; 1316 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV 1317 | NETIF_MSG_PROBE | NETIF_MSG_LINK); 1318 skb_queue_head_init (&dev->rxq); 1319 skb_queue_head_init (&dev->txq); 1320 skb_queue_head_init (&dev->done); 1321 skb_queue_head_init(&dev->rxq_pause); 1322 dev->bh.func = usbnet_bh; 1323 dev->bh.data = (unsigned long) dev; 1324 INIT_WORK (&dev->kevent, kevent); 1325 init_usb_anchor(&dev->deferred); 1326 dev->delay.function = usbnet_bh; 1327 dev->delay.data = (unsigned long) dev; 1328 init_timer (&dev->delay); 1329 mutex_init (&dev->phy_mutex); 1330 1331 dev->net = net; 1332 strcpy (net->name, "usb%d"); 1333 memcpy (net->dev_addr, node_id, sizeof node_id); 1334 1335 /* rx and tx sides can use different message sizes; 1336 * bind() should set rx_urb_size in that case. 1337 */ 1338 dev->hard_mtu = net->mtu + net->hard_header_len; 1339 #if 0 1340 // dma_supported() is deeply broken on almost all architectures 1341 // possible with some EHCI controllers 1342 if (dma_supported (&udev->dev, DMA_BIT_MASK(64))) 1343 net->features |= NETIF_F_HIGHDMA; 1344 #endif 1345 1346 net->netdev_ops = &usbnet_netdev_ops; 1347 net->watchdog_timeo = TX_TIMEOUT_JIFFIES; 1348 net->ethtool_ops = &usbnet_ethtool_ops; 1349 1350 // allow device-specific bind/init procedures 1351 // NOTE net->name still not usable ... 1352 if (info->bind) { 1353 status = info->bind (dev, udev); 1354 if (status < 0) 1355 goto out1; 1356 1357 // heuristic: "usb%d" for links we know are two-host, 1358 // else "eth%d" when there's reasonable doubt. userspace 1359 // can rename the link if it knows better. 1360 if ((dev->driver_info->flags & FLAG_ETHER) != 0 && 1361 (net->dev_addr [0] & 0x02) == 0) 1362 strcpy (net->name, "eth%d"); 1363 /* WLAN devices should always be named "wlan%d" */ 1364 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1365 strcpy(net->name, "wlan%d"); 1366 /* WWAN devices should always be named "wwan%d" */ 1367 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1368 strcpy(net->name, "wwan%d"); 1369 1370 /* maybe the remote can't receive an Ethernet MTU */ 1371 if (net->mtu > (dev->hard_mtu - net->hard_header_len)) 1372 net->mtu = dev->hard_mtu - net->hard_header_len; 1373 } else if (!info->in || !info->out) 1374 status = usbnet_get_endpoints (dev, udev); 1375 else { 1376 dev->in = usb_rcvbulkpipe (xdev, info->in); 1377 dev->out = usb_sndbulkpipe (xdev, info->out); 1378 if (!(info->flags & FLAG_NO_SETINT)) 1379 status = usb_set_interface (xdev, 1380 interface->desc.bInterfaceNumber, 1381 interface->desc.bAlternateSetting); 1382 else 1383 status = 0; 1384 1385 } 1386 if (status >= 0 && dev->status) 1387 status = init_status (dev, udev); 1388 if (status < 0) 1389 goto out3; 1390 1391 if (!dev->rx_urb_size) 1392 dev->rx_urb_size = dev->hard_mtu; 1393 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); 1394 1395 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1396 SET_NETDEV_DEVTYPE(net, &wlan_type); 1397 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1398 SET_NETDEV_DEVTYPE(net, &wwan_type); 1399 1400 status = register_netdev (net); 1401 if (status) 1402 goto out3; 1403 netif_info(dev, probe, dev->net, 1404 "register '%s' at usb-%s-%s, %s, %pM\n", 1405 udev->dev.driver->name, 1406 xdev->bus->bus_name, xdev->devpath, 1407 dev->driver_info->description, 1408 net->dev_addr); 1409 1410 // ok, it's ready to go. 1411 usb_set_intfdata (udev, dev); 1412 1413 netif_device_attach (net); 1414 1415 if (dev->driver_info->flags & FLAG_LINK_INTR) 1416 netif_carrier_off(net); 1417 1418 return 0; 1419 1420 out3: 1421 if (info->unbind) 1422 info->unbind (dev, udev); 1423 out1: 1424 free_netdev(net); 1425 out: 1426 usb_put_dev(xdev); 1427 return status; 1428 } 1429 EXPORT_SYMBOL_GPL(usbnet_probe); 1430 1431 /*-------------------------------------------------------------------------*/ 1432 1433 /* 1434 * suspend the whole driver as soon as the first interface is suspended 1435 * resume only when the last interface is resumed 1436 */ 1437 1438 int usbnet_suspend (struct usb_interface *intf, pm_message_t message) 1439 { 1440 struct usbnet *dev = usb_get_intfdata(intf); 1441 1442 if (!dev->suspend_count++) { 1443 spin_lock_irq(&dev->txq.lock); 1444 /* don't autosuspend while transmitting */ 1445 if (dev->txq.qlen && (message.event & PM_EVENT_AUTO)) { 1446 spin_unlock_irq(&dev->txq.lock); 1447 return -EBUSY; 1448 } else { 1449 set_bit(EVENT_DEV_ASLEEP, &dev->flags); 1450 spin_unlock_irq(&dev->txq.lock); 1451 } 1452 /* 1453 * accelerate emptying of the rx and queues, to avoid 1454 * having everything error out. 1455 */ 1456 netif_device_detach (dev->net); 1457 usbnet_terminate_urbs(dev); 1458 usb_kill_urb(dev->interrupt); 1459 1460 /* 1461 * reattach so runtime management can use and 1462 * wake the device 1463 */ 1464 netif_device_attach (dev->net); 1465 } 1466 return 0; 1467 } 1468 EXPORT_SYMBOL_GPL(usbnet_suspend); 1469 1470 int usbnet_resume (struct usb_interface *intf) 1471 { 1472 struct usbnet *dev = usb_get_intfdata(intf); 1473 struct sk_buff *skb; 1474 struct urb *res; 1475 int retval; 1476 1477 if (!--dev->suspend_count) { 1478 spin_lock_irq(&dev->txq.lock); 1479 while ((res = usb_get_from_anchor(&dev->deferred))) { 1480 1481 skb = (struct sk_buff *)res->context; 1482 retval = usb_submit_urb(res, GFP_ATOMIC); 1483 if (retval < 0) { 1484 dev_kfree_skb_any(skb); 1485 usb_free_urb(res); 1486 usb_autopm_put_interface_async(dev->intf); 1487 } else { 1488 dev->net->trans_start = jiffies; 1489 __skb_queue_tail(&dev->txq, skb); 1490 } 1491 } 1492 1493 smp_mb(); 1494 clear_bit(EVENT_DEV_ASLEEP, &dev->flags); 1495 spin_unlock_irq(&dev->txq.lock); 1496 if (!(dev->txq.qlen >= TX_QLEN(dev))) 1497 netif_start_queue(dev->net); 1498 tasklet_schedule (&dev->bh); 1499 } 1500 return 0; 1501 } 1502 EXPORT_SYMBOL_GPL(usbnet_resume); 1503 1504 1505 /*-------------------------------------------------------------------------*/ 1506 1507 static int __init usbnet_init(void) 1508 { 1509 /* compiler should optimize this out */ 1510 BUILD_BUG_ON (sizeof (((struct sk_buff *)0)->cb) 1511 < sizeof (struct skb_data)); 1512 1513 random_ether_addr(node_id); 1514 return 0; 1515 } 1516 module_init(usbnet_init); 1517 1518 static void __exit usbnet_exit(void) 1519 { 1520 } 1521 module_exit(usbnet_exit); 1522 1523 MODULE_AUTHOR("David Brownell"); 1524 MODULE_DESCRIPTION("USB network driver framework"); 1525 MODULE_LICENSE("GPL"); 1526