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 altsettings. 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 /* With RX_ASSEMBLE, rx_fixup() must update counters */ 392 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE)) 393 dev->net->stats.rx_errors++; 394 goto done; 395 } 396 // else network stack removes extra byte if we forced a short packet 397 398 if (skb->len) { 399 /* all data was already cloned from skb inside the driver */ 400 if (dev->driver_info->flags & FLAG_MULTI_PACKET) 401 dev_kfree_skb_any(skb); 402 else 403 usbnet_skb_return(dev, skb); 404 return; 405 } 406 407 netif_dbg(dev, rx_err, dev->net, "drop\n"); 408 dev->net->stats.rx_errors++; 409 done: 410 skb_queue_tail(&dev->done, skb); 411 } 412 413 /*-------------------------------------------------------------------------*/ 414 415 static void rx_complete (struct urb *urb) 416 { 417 struct sk_buff *skb = (struct sk_buff *) urb->context; 418 struct skb_data *entry = (struct skb_data *) skb->cb; 419 struct usbnet *dev = entry->dev; 420 int urb_status = urb->status; 421 422 skb_put (skb, urb->actual_length); 423 entry->state = rx_done; 424 entry->urb = NULL; 425 426 switch (urb_status) { 427 /* success */ 428 case 0: 429 if (skb->len < dev->net->hard_header_len) { 430 entry->state = rx_cleanup; 431 dev->net->stats.rx_errors++; 432 dev->net->stats.rx_length_errors++; 433 netif_dbg(dev, rx_err, dev->net, 434 "rx length %d\n", skb->len); 435 } 436 break; 437 438 /* stalls need manual reset. this is rare ... except that 439 * when going through USB 2.0 TTs, unplug appears this way. 440 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ 441 * storm, recovering as needed. 442 */ 443 case -EPIPE: 444 dev->net->stats.rx_errors++; 445 usbnet_defer_kevent (dev, EVENT_RX_HALT); 446 // FALLTHROUGH 447 448 /* software-driven interface shutdown */ 449 case -ECONNRESET: /* async unlink */ 450 case -ESHUTDOWN: /* hardware gone */ 451 netif_dbg(dev, ifdown, dev->net, 452 "rx shutdown, code %d\n", urb_status); 453 goto block; 454 455 /* we get controller i/o faults during khubd disconnect() delays. 456 * throttle down resubmits, to avoid log floods; just temporarily, 457 * so we still recover when the fault isn't a khubd delay. 458 */ 459 case -EPROTO: 460 case -ETIME: 461 case -EILSEQ: 462 dev->net->stats.rx_errors++; 463 if (!timer_pending (&dev->delay)) { 464 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); 465 netif_dbg(dev, link, dev->net, 466 "rx throttle %d\n", urb_status); 467 } 468 block: 469 entry->state = rx_cleanup; 470 entry->urb = urb; 471 urb = NULL; 472 break; 473 474 /* data overrun ... flush fifo? */ 475 case -EOVERFLOW: 476 dev->net->stats.rx_over_errors++; 477 // FALLTHROUGH 478 479 default: 480 entry->state = rx_cleanup; 481 dev->net->stats.rx_errors++; 482 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status); 483 break; 484 } 485 486 defer_bh(dev, skb, &dev->rxq); 487 488 if (urb) { 489 if (netif_running (dev->net) && 490 !test_bit (EVENT_RX_HALT, &dev->flags)) { 491 rx_submit (dev, urb, GFP_ATOMIC); 492 return; 493 } 494 usb_free_urb (urb); 495 } 496 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n"); 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 netif_dbg(dev, ifdown, dev->net, 514 "intr shutdown, code %d\n", status); 515 return; 516 517 /* NOTE: not throttling like RX/TX, since this endpoint 518 * already polls infrequently 519 */ 520 default: 521 netdev_dbg(dev->net, "intr status %d\n", 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) 531 netif_err(dev, timer, dev->net, 532 "intr resubmit --> %d\n", status); 533 } 534 535 /*-------------------------------------------------------------------------*/ 536 void usbnet_pause_rx(struct usbnet *dev) 537 { 538 set_bit(EVENT_RX_PAUSED, &dev->flags); 539 540 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n"); 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 netif_dbg(dev, rx_status, dev->net, 559 "paused rx queue disabled, %d skbs requeued\n", 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 netdev_dbg(dev->net, "unlink urb err, %d\n", 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(msecs_to_jiffies(UNLINK_TIMEOUT_MS)); 633 set_current_state(TASK_UNINTERRUPTIBLE); 634 netif_dbg(dev, ifdown, dev->net, 635 "waited for %d urb completions\n", temp); 636 } 637 set_current_state(TASK_RUNNING); 638 dev->wait = NULL; 639 remove_wait_queue(&unlink_wakeup, &wait); 640 } 641 642 int usbnet_stop (struct net_device *net) 643 { 644 struct usbnet *dev = netdev_priv(net); 645 struct driver_info *info = dev->driver_info; 646 int retval; 647 648 clear_bit(EVENT_DEV_OPEN, &dev->flags); 649 netif_stop_queue (net); 650 651 netif_info(dev, ifdown, dev->net, 652 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n", 653 net->stats.rx_packets, net->stats.tx_packets, 654 net->stats.rx_errors, net->stats.tx_errors); 655 656 /* allow minidriver to stop correctly (wireless devices to turn off 657 * radio etc) */ 658 if (info->stop) { 659 retval = info->stop(dev); 660 if (retval < 0) 661 netif_info(dev, ifdown, dev->net, 662 "stop fail (%d) usbnet usb-%s-%s, %s\n", 663 retval, 664 dev->udev->bus->bus_name, dev->udev->devpath, 665 info->description); 666 } 667 668 if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) 669 usbnet_terminate_urbs(dev); 670 671 usb_kill_urb(dev->interrupt); 672 673 usbnet_purge_paused_rxq(dev); 674 675 /* deferred work (task, timer, softirq) must also stop. 676 * can't flush_scheduled_work() until we drop rtnl (later), 677 * else workers could deadlock; so make workers a NOP. 678 */ 679 dev->flags = 0; 680 del_timer_sync (&dev->delay); 681 tasklet_kill (&dev->bh); 682 if (info->manage_power) 683 info->manage_power(dev, 0); 684 else 685 usb_autopm_put_interface(dev->intf); 686 687 return 0; 688 } 689 EXPORT_SYMBOL_GPL(usbnet_stop); 690 691 /*-------------------------------------------------------------------------*/ 692 693 // posts reads, and enables write queuing 694 695 // precondition: never called in_interrupt 696 697 int usbnet_open (struct net_device *net) 698 { 699 struct usbnet *dev = netdev_priv(net); 700 int retval; 701 struct driver_info *info = dev->driver_info; 702 703 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { 704 netif_info(dev, ifup, dev->net, 705 "resumption 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_nopm; 711 } 712 713 // put into "known safe" state 714 if (info->reset && (retval = info->reset (dev)) < 0) { 715 netif_info(dev, ifup, dev->net, 716 "open reset fail (%d) usbnet usb-%s-%s, %s\n", 717 retval, 718 dev->udev->bus->bus_name, 719 dev->udev->devpath, 720 info->description); 721 goto done; 722 } 723 724 // insist peer be connected 725 if (info->check_connect && (retval = info->check_connect (dev)) < 0) { 726 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval); 727 goto done; 728 } 729 730 /* start any status interrupt transfer */ 731 if (dev->interrupt) { 732 retval = usb_submit_urb (dev->interrupt, GFP_KERNEL); 733 if (retval < 0) { 734 netif_err(dev, ifup, dev->net, 735 "intr submit %d\n", retval); 736 goto done; 737 } 738 } 739 740 set_bit(EVENT_DEV_OPEN, &dev->flags); 741 netif_start_queue (net); 742 netif_info(dev, ifup, dev->net, 743 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n", 744 (int)RX_QLEN(dev), (int)TX_QLEN(dev), 745 dev->net->mtu, 746 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" : 747 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" : 748 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" : 749 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" : 750 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" : 751 "simple"); 752 753 // delay posting reads until we're fully open 754 tasklet_schedule (&dev->bh); 755 if (info->manage_power) { 756 retval = info->manage_power(dev, 1); 757 if (retval < 0) 758 goto done; 759 usb_autopm_put_interface(dev->intf); 760 } 761 return retval; 762 763 done: 764 usb_autopm_put_interface(dev->intf); 765 done_nopm: 766 return retval; 767 } 768 EXPORT_SYMBOL_GPL(usbnet_open); 769 770 /*-------------------------------------------------------------------------*/ 771 772 /* ethtool methods; minidrivers may need to add some more, but 773 * they'll probably want to use this base set. 774 */ 775 776 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd) 777 { 778 struct usbnet *dev = netdev_priv(net); 779 780 if (!dev->mii.mdio_read) 781 return -EOPNOTSUPP; 782 783 return mii_ethtool_gset(&dev->mii, cmd); 784 } 785 EXPORT_SYMBOL_GPL(usbnet_get_settings); 786 787 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd) 788 { 789 struct usbnet *dev = netdev_priv(net); 790 int retval; 791 792 if (!dev->mii.mdio_write) 793 return -EOPNOTSUPP; 794 795 retval = mii_ethtool_sset(&dev->mii, cmd); 796 797 /* link speed/duplex might have changed */ 798 if (dev->driver_info->link_reset) 799 dev->driver_info->link_reset(dev); 800 801 return retval; 802 803 } 804 EXPORT_SYMBOL_GPL(usbnet_set_settings); 805 806 u32 usbnet_get_link (struct net_device *net) 807 { 808 struct usbnet *dev = netdev_priv(net); 809 810 /* If a check_connect is defined, return its result */ 811 if (dev->driver_info->check_connect) 812 return dev->driver_info->check_connect (dev) == 0; 813 814 /* if the device has mii operations, use those */ 815 if (dev->mii.mdio_read) 816 return mii_link_ok(&dev->mii); 817 818 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ 819 return ethtool_op_get_link(net); 820 } 821 EXPORT_SYMBOL_GPL(usbnet_get_link); 822 823 int usbnet_nway_reset(struct net_device *net) 824 { 825 struct usbnet *dev = netdev_priv(net); 826 827 if (!dev->mii.mdio_write) 828 return -EOPNOTSUPP; 829 830 return mii_nway_restart(&dev->mii); 831 } 832 EXPORT_SYMBOL_GPL(usbnet_nway_reset); 833 834 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) 835 { 836 struct usbnet *dev = netdev_priv(net); 837 838 strncpy (info->driver, dev->driver_name, sizeof info->driver); 839 strncpy (info->version, DRIVER_VERSION, sizeof info->version); 840 strncpy (info->fw_version, dev->driver_info->description, 841 sizeof info->fw_version); 842 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); 843 } 844 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); 845 846 u32 usbnet_get_msglevel (struct net_device *net) 847 { 848 struct usbnet *dev = netdev_priv(net); 849 850 return dev->msg_enable; 851 } 852 EXPORT_SYMBOL_GPL(usbnet_get_msglevel); 853 854 void usbnet_set_msglevel (struct net_device *net, u32 level) 855 { 856 struct usbnet *dev = netdev_priv(net); 857 858 dev->msg_enable = level; 859 } 860 EXPORT_SYMBOL_GPL(usbnet_set_msglevel); 861 862 /* drivers may override default ethtool_ops in their bind() routine */ 863 static const struct ethtool_ops usbnet_ethtool_ops = { 864 .get_settings = usbnet_get_settings, 865 .set_settings = usbnet_set_settings, 866 .get_link = usbnet_get_link, 867 .nway_reset = usbnet_nway_reset, 868 .get_drvinfo = usbnet_get_drvinfo, 869 .get_msglevel = usbnet_get_msglevel, 870 .set_msglevel = usbnet_set_msglevel, 871 }; 872 873 /*-------------------------------------------------------------------------*/ 874 875 /* work that cannot be done in interrupt context uses keventd. 876 * 877 * NOTE: with 2.5 we could do more of this using completion callbacks, 878 * especially now that control transfers can be queued. 879 */ 880 static void 881 kevent (struct work_struct *work) 882 { 883 struct usbnet *dev = 884 container_of(work, struct usbnet, kevent); 885 int status; 886 887 /* usb_clear_halt() needs a thread context */ 888 if (test_bit (EVENT_TX_HALT, &dev->flags)) { 889 unlink_urbs (dev, &dev->txq); 890 status = usb_autopm_get_interface(dev->intf); 891 if (status < 0) 892 goto fail_pipe; 893 status = usb_clear_halt (dev->udev, dev->out); 894 usb_autopm_put_interface(dev->intf); 895 if (status < 0 && 896 status != -EPIPE && 897 status != -ESHUTDOWN) { 898 if (netif_msg_tx_err (dev)) 899 fail_pipe: 900 netdev_err(dev->net, "can't clear tx halt, status %d\n", 901 status); 902 } else { 903 clear_bit (EVENT_TX_HALT, &dev->flags); 904 if (status != -ESHUTDOWN) 905 netif_wake_queue (dev->net); 906 } 907 } 908 if (test_bit (EVENT_RX_HALT, &dev->flags)) { 909 unlink_urbs (dev, &dev->rxq); 910 status = usb_autopm_get_interface(dev->intf); 911 if (status < 0) 912 goto fail_halt; 913 status = usb_clear_halt (dev->udev, dev->in); 914 usb_autopm_put_interface(dev->intf); 915 if (status < 0 && 916 status != -EPIPE && 917 status != -ESHUTDOWN) { 918 if (netif_msg_rx_err (dev)) 919 fail_halt: 920 netdev_err(dev->net, "can't clear rx halt, status %d\n", 921 status); 922 } else { 923 clear_bit (EVENT_RX_HALT, &dev->flags); 924 tasklet_schedule (&dev->bh); 925 } 926 } 927 928 /* tasklet could resubmit itself forever if memory is tight */ 929 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { 930 struct urb *urb = NULL; 931 int resched = 1; 932 933 if (netif_running (dev->net)) 934 urb = usb_alloc_urb (0, GFP_KERNEL); 935 else 936 clear_bit (EVENT_RX_MEMORY, &dev->flags); 937 if (urb != NULL) { 938 clear_bit (EVENT_RX_MEMORY, &dev->flags); 939 status = usb_autopm_get_interface(dev->intf); 940 if (status < 0) { 941 usb_free_urb(urb); 942 goto fail_lowmem; 943 } 944 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) 945 resched = 0; 946 usb_autopm_put_interface(dev->intf); 947 fail_lowmem: 948 if (resched) 949 tasklet_schedule (&dev->bh); 950 } 951 } 952 953 if (test_bit (EVENT_LINK_RESET, &dev->flags)) { 954 struct driver_info *info = dev->driver_info; 955 int retval = 0; 956 957 clear_bit (EVENT_LINK_RESET, &dev->flags); 958 status = usb_autopm_get_interface(dev->intf); 959 if (status < 0) 960 goto skip_reset; 961 if(info->link_reset && (retval = info->link_reset(dev)) < 0) { 962 usb_autopm_put_interface(dev->intf); 963 skip_reset: 964 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", 965 retval, 966 dev->udev->bus->bus_name, 967 dev->udev->devpath, 968 info->description); 969 } else { 970 usb_autopm_put_interface(dev->intf); 971 } 972 } 973 974 if (dev->flags) 975 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); 976 } 977 978 /*-------------------------------------------------------------------------*/ 979 980 static void tx_complete (struct urb *urb) 981 { 982 struct sk_buff *skb = (struct sk_buff *) urb->context; 983 struct skb_data *entry = (struct skb_data *) skb->cb; 984 struct usbnet *dev = entry->dev; 985 986 if (urb->status == 0) { 987 if (!(dev->driver_info->flags & FLAG_MULTI_PACKET)) 988 dev->net->stats.tx_packets++; 989 dev->net->stats.tx_bytes += entry->length; 990 } else { 991 dev->net->stats.tx_errors++; 992 993 switch (urb->status) { 994 case -EPIPE: 995 usbnet_defer_kevent (dev, EVENT_TX_HALT); 996 break; 997 998 /* software-driven interface shutdown */ 999 case -ECONNRESET: // async unlink 1000 case -ESHUTDOWN: // hardware gone 1001 break; 1002 1003 // like rx, tx gets controller i/o faults during khubd delays 1004 // and so it uses the same throttling mechanism. 1005 case -EPROTO: 1006 case -ETIME: 1007 case -EILSEQ: 1008 usb_mark_last_busy(dev->udev); 1009 if (!timer_pending (&dev->delay)) { 1010 mod_timer (&dev->delay, 1011 jiffies + THROTTLE_JIFFIES); 1012 netif_dbg(dev, link, dev->net, 1013 "tx throttle %d\n", urb->status); 1014 } 1015 netif_stop_queue (dev->net); 1016 break; 1017 default: 1018 netif_dbg(dev, tx_err, dev->net, 1019 "tx err %d\n", entry->urb->status); 1020 break; 1021 } 1022 } 1023 1024 usb_autopm_put_interface_async(dev->intf); 1025 urb->dev = NULL; 1026 entry->state = tx_done; 1027 defer_bh(dev, skb, &dev->txq); 1028 } 1029 1030 /*-------------------------------------------------------------------------*/ 1031 1032 void usbnet_tx_timeout (struct net_device *net) 1033 { 1034 struct usbnet *dev = netdev_priv(net); 1035 1036 unlink_urbs (dev, &dev->txq); 1037 tasklet_schedule (&dev->bh); 1038 1039 // FIXME: device recovery -- reset? 1040 } 1041 EXPORT_SYMBOL_GPL(usbnet_tx_timeout); 1042 1043 /*-------------------------------------------------------------------------*/ 1044 1045 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, 1046 struct net_device *net) 1047 { 1048 struct usbnet *dev = netdev_priv(net); 1049 int length; 1050 struct urb *urb = NULL; 1051 struct skb_data *entry; 1052 struct driver_info *info = dev->driver_info; 1053 unsigned long flags; 1054 int retval; 1055 1056 // some devices want funky USB-level framing, for 1057 // win32 driver (usually) and/or hardware quirks 1058 if (info->tx_fixup) { 1059 skb = info->tx_fixup (dev, skb, GFP_ATOMIC); 1060 if (!skb) { 1061 if (netif_msg_tx_err(dev)) { 1062 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); 1063 goto drop; 1064 } else { 1065 /* cdc_ncm collected packet; waits for more */ 1066 goto not_drop; 1067 } 1068 } 1069 } 1070 length = skb->len; 1071 1072 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { 1073 netif_dbg(dev, tx_err, dev->net, "no urb\n"); 1074 goto drop; 1075 } 1076 1077 entry = (struct skb_data *) skb->cb; 1078 entry->urb = urb; 1079 entry->dev = dev; 1080 entry->state = tx_start; 1081 entry->length = length; 1082 1083 usb_fill_bulk_urb (urb, dev->udev, dev->out, 1084 skb->data, skb->len, tx_complete, skb); 1085 1086 /* don't assume the hardware handles USB_ZERO_PACKET 1087 * NOTE: strictly conforming cdc-ether devices should expect 1088 * the ZLP here, but ignore the one-byte packet. 1089 * NOTE2: CDC NCM specification is different from CDC ECM when 1090 * handling ZLP/short packets, so cdc_ncm driver will make short 1091 * packet itself if needed. 1092 */ 1093 if (length % dev->maxpacket == 0) { 1094 if (!(info->flags & FLAG_SEND_ZLP)) { 1095 if (!(info->flags & FLAG_MULTI_PACKET)) { 1096 urb->transfer_buffer_length++; 1097 if (skb_tailroom(skb)) { 1098 skb->data[skb->len] = 0; 1099 __skb_put(skb, 1); 1100 } 1101 } 1102 } else 1103 urb->transfer_flags |= URB_ZERO_PACKET; 1104 } 1105 1106 spin_lock_irqsave(&dev->txq.lock, flags); 1107 retval = usb_autopm_get_interface_async(dev->intf); 1108 if (retval < 0) { 1109 spin_unlock_irqrestore(&dev->txq.lock, flags); 1110 goto drop; 1111 } 1112 1113 #ifdef CONFIG_PM 1114 /* if this triggers the device is still a sleep */ 1115 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { 1116 /* transmission will be done in resume */ 1117 usb_anchor_urb(urb, &dev->deferred); 1118 /* no use to process more packets */ 1119 netif_stop_queue(net); 1120 spin_unlock_irqrestore(&dev->txq.lock, flags); 1121 netdev_dbg(dev->net, "Delaying transmission for resumption\n"); 1122 goto deferred; 1123 } 1124 #endif 1125 1126 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { 1127 case -EPIPE: 1128 netif_stop_queue (net); 1129 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1130 usb_autopm_put_interface_async(dev->intf); 1131 break; 1132 default: 1133 usb_autopm_put_interface_async(dev->intf); 1134 netif_dbg(dev, tx_err, dev->net, 1135 "tx: submit urb err %d\n", retval); 1136 break; 1137 case 0: 1138 net->trans_start = jiffies; 1139 __skb_queue_tail (&dev->txq, skb); 1140 if (dev->txq.qlen >= TX_QLEN (dev)) 1141 netif_stop_queue (net); 1142 } 1143 spin_unlock_irqrestore (&dev->txq.lock, flags); 1144 1145 if (retval) { 1146 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); 1147 drop: 1148 dev->net->stats.tx_dropped++; 1149 not_drop: 1150 if (skb) 1151 dev_kfree_skb_any (skb); 1152 usb_free_urb (urb); 1153 } else 1154 netif_dbg(dev, tx_queued, dev->net, 1155 "> tx, len %d, type 0x%x\n", length, skb->protocol); 1156 #ifdef CONFIG_PM 1157 deferred: 1158 #endif 1159 return NETDEV_TX_OK; 1160 } 1161 EXPORT_SYMBOL_GPL(usbnet_start_xmit); 1162 1163 /*-------------------------------------------------------------------------*/ 1164 1165 // tasklet (work deferred from completions, in_irq) or timer 1166 1167 static void usbnet_bh (unsigned long param) 1168 { 1169 struct usbnet *dev = (struct usbnet *) param; 1170 struct sk_buff *skb; 1171 struct skb_data *entry; 1172 1173 while ((skb = skb_dequeue (&dev->done))) { 1174 entry = (struct skb_data *) skb->cb; 1175 switch (entry->state) { 1176 case rx_done: 1177 entry->state = rx_cleanup; 1178 rx_process (dev, skb); 1179 continue; 1180 case tx_done: 1181 case rx_cleanup: 1182 usb_free_urb (entry->urb); 1183 dev_kfree_skb (skb); 1184 continue; 1185 default: 1186 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); 1187 } 1188 } 1189 1190 // waiting for all pending urbs to complete? 1191 if (dev->wait) { 1192 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) { 1193 wake_up (dev->wait); 1194 } 1195 1196 // or are we maybe short a few urbs? 1197 } else if (netif_running (dev->net) && 1198 netif_device_present (dev->net) && 1199 !timer_pending (&dev->delay) && 1200 !test_bit (EVENT_RX_HALT, &dev->flags)) { 1201 int temp = dev->rxq.qlen; 1202 int qlen = RX_QLEN (dev); 1203 1204 if (temp < qlen) { 1205 struct urb *urb; 1206 int i; 1207 1208 // don't refill the queue all at once 1209 for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) { 1210 urb = usb_alloc_urb (0, GFP_ATOMIC); 1211 if (urb != NULL) { 1212 if (rx_submit (dev, urb, GFP_ATOMIC) == 1213 -ENOLINK) 1214 return; 1215 } 1216 } 1217 if (temp != dev->rxq.qlen) 1218 netif_dbg(dev, link, dev->net, 1219 "rxqlen %d --> %d\n", 1220 temp, dev->rxq.qlen); 1221 if (dev->rxq.qlen < qlen) 1222 tasklet_schedule (&dev->bh); 1223 } 1224 if (dev->txq.qlen < TX_QLEN (dev)) 1225 netif_wake_queue (dev->net); 1226 } 1227 } 1228 1229 1230 /*------------------------------------------------------------------------- 1231 * 1232 * USB Device Driver support 1233 * 1234 *-------------------------------------------------------------------------*/ 1235 1236 // precondition: never called in_interrupt 1237 1238 void usbnet_disconnect (struct usb_interface *intf) 1239 { 1240 struct usbnet *dev; 1241 struct usb_device *xdev; 1242 struct net_device *net; 1243 1244 dev = usb_get_intfdata(intf); 1245 usb_set_intfdata(intf, NULL); 1246 if (!dev) 1247 return; 1248 1249 xdev = interface_to_usbdev (intf); 1250 1251 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", 1252 intf->dev.driver->name, 1253 xdev->bus->bus_name, xdev->devpath, 1254 dev->driver_info->description); 1255 1256 net = dev->net; 1257 unregister_netdev (net); 1258 1259 cancel_work_sync(&dev->kevent); 1260 1261 if (dev->driver_info->unbind) 1262 dev->driver_info->unbind (dev, intf); 1263 1264 usb_kill_urb(dev->interrupt); 1265 usb_free_urb(dev->interrupt); 1266 1267 free_netdev(net); 1268 usb_put_dev (xdev); 1269 } 1270 EXPORT_SYMBOL_GPL(usbnet_disconnect); 1271 1272 static const struct net_device_ops usbnet_netdev_ops = { 1273 .ndo_open = usbnet_open, 1274 .ndo_stop = usbnet_stop, 1275 .ndo_start_xmit = usbnet_start_xmit, 1276 .ndo_tx_timeout = usbnet_tx_timeout, 1277 .ndo_change_mtu = usbnet_change_mtu, 1278 .ndo_set_mac_address = eth_mac_addr, 1279 .ndo_validate_addr = eth_validate_addr, 1280 }; 1281 1282 /*-------------------------------------------------------------------------*/ 1283 1284 // precondition: never called in_interrupt 1285 1286 static struct device_type wlan_type = { 1287 .name = "wlan", 1288 }; 1289 1290 static struct device_type wwan_type = { 1291 .name = "wwan", 1292 }; 1293 1294 int 1295 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) 1296 { 1297 struct usbnet *dev; 1298 struct net_device *net; 1299 struct usb_host_interface *interface; 1300 struct driver_info *info; 1301 struct usb_device *xdev; 1302 int status; 1303 const char *name; 1304 struct usb_driver *driver = to_usb_driver(udev->dev.driver); 1305 1306 /* usbnet already took usb runtime pm, so have to enable the feature 1307 * for usb interface, otherwise usb_autopm_get_interface may return 1308 * failure if USB_SUSPEND(RUNTIME_PM) is enabled. 1309 */ 1310 if (!driver->supports_autosuspend) { 1311 driver->supports_autosuspend = 1; 1312 pm_runtime_enable(&udev->dev); 1313 } 1314 1315 name = udev->dev.driver->name; 1316 info = (struct driver_info *) prod->driver_info; 1317 if (!info) { 1318 dev_dbg (&udev->dev, "blacklisted by %s\n", name); 1319 return -ENODEV; 1320 } 1321 xdev = interface_to_usbdev (udev); 1322 interface = udev->cur_altsetting; 1323 1324 usb_get_dev (xdev); 1325 1326 status = -ENOMEM; 1327 1328 // set up our own records 1329 net = alloc_etherdev(sizeof(*dev)); 1330 if (!net) { 1331 dbg ("can't kmalloc dev"); 1332 goto out; 1333 } 1334 1335 /* netdev_printk() needs this so do it as early as possible */ 1336 SET_NETDEV_DEV(net, &udev->dev); 1337 1338 dev = netdev_priv(net); 1339 dev->udev = xdev; 1340 dev->intf = udev; 1341 dev->driver_info = info; 1342 dev->driver_name = name; 1343 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV 1344 | NETIF_MSG_PROBE | NETIF_MSG_LINK); 1345 skb_queue_head_init (&dev->rxq); 1346 skb_queue_head_init (&dev->txq); 1347 skb_queue_head_init (&dev->done); 1348 skb_queue_head_init(&dev->rxq_pause); 1349 dev->bh.func = usbnet_bh; 1350 dev->bh.data = (unsigned long) dev; 1351 INIT_WORK (&dev->kevent, kevent); 1352 init_usb_anchor(&dev->deferred); 1353 dev->delay.function = usbnet_bh; 1354 dev->delay.data = (unsigned long) dev; 1355 init_timer (&dev->delay); 1356 mutex_init (&dev->phy_mutex); 1357 1358 dev->net = net; 1359 strcpy (net->name, "usb%d"); 1360 memcpy (net->dev_addr, node_id, sizeof node_id); 1361 1362 /* rx and tx sides can use different message sizes; 1363 * bind() should set rx_urb_size in that case. 1364 */ 1365 dev->hard_mtu = net->mtu + net->hard_header_len; 1366 #if 0 1367 // dma_supported() is deeply broken on almost all architectures 1368 // possible with some EHCI controllers 1369 if (dma_supported (&udev->dev, DMA_BIT_MASK(64))) 1370 net->features |= NETIF_F_HIGHDMA; 1371 #endif 1372 1373 net->netdev_ops = &usbnet_netdev_ops; 1374 net->watchdog_timeo = TX_TIMEOUT_JIFFIES; 1375 net->ethtool_ops = &usbnet_ethtool_ops; 1376 1377 // allow device-specific bind/init procedures 1378 // NOTE net->name still not usable ... 1379 if (info->bind) { 1380 status = info->bind (dev, udev); 1381 if (status < 0) 1382 goto out1; 1383 1384 // heuristic: "usb%d" for links we know are two-host, 1385 // else "eth%d" when there's reasonable doubt. userspace 1386 // can rename the link if it knows better. 1387 if ((dev->driver_info->flags & FLAG_ETHER) != 0 && 1388 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 || 1389 (net->dev_addr [0] & 0x02) == 0)) 1390 strcpy (net->name, "eth%d"); 1391 /* WLAN devices should always be named "wlan%d" */ 1392 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1393 strcpy(net->name, "wlan%d"); 1394 /* WWAN devices should always be named "wwan%d" */ 1395 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1396 strcpy(net->name, "wwan%d"); 1397 1398 /* maybe the remote can't receive an Ethernet MTU */ 1399 if (net->mtu > (dev->hard_mtu - net->hard_header_len)) 1400 net->mtu = dev->hard_mtu - net->hard_header_len; 1401 } else if (!info->in || !info->out) 1402 status = usbnet_get_endpoints (dev, udev); 1403 else { 1404 dev->in = usb_rcvbulkpipe (xdev, info->in); 1405 dev->out = usb_sndbulkpipe (xdev, info->out); 1406 if (!(info->flags & FLAG_NO_SETINT)) 1407 status = usb_set_interface (xdev, 1408 interface->desc.bInterfaceNumber, 1409 interface->desc.bAlternateSetting); 1410 else 1411 status = 0; 1412 1413 } 1414 if (status >= 0 && dev->status) 1415 status = init_status (dev, udev); 1416 if (status < 0) 1417 goto out3; 1418 1419 if (!dev->rx_urb_size) 1420 dev->rx_urb_size = dev->hard_mtu; 1421 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); 1422 1423 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1424 SET_NETDEV_DEVTYPE(net, &wlan_type); 1425 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1426 SET_NETDEV_DEVTYPE(net, &wwan_type); 1427 1428 status = register_netdev (net); 1429 if (status) 1430 goto out3; 1431 netif_info(dev, probe, dev->net, 1432 "register '%s' at usb-%s-%s, %s, %pM\n", 1433 udev->dev.driver->name, 1434 xdev->bus->bus_name, xdev->devpath, 1435 dev->driver_info->description, 1436 net->dev_addr); 1437 1438 // ok, it's ready to go. 1439 usb_set_intfdata (udev, dev); 1440 1441 netif_device_attach (net); 1442 1443 if (dev->driver_info->flags & FLAG_LINK_INTR) 1444 netif_carrier_off(net); 1445 1446 return 0; 1447 1448 out3: 1449 if (info->unbind) 1450 info->unbind (dev, udev); 1451 out1: 1452 free_netdev(net); 1453 out: 1454 usb_put_dev(xdev); 1455 return status; 1456 } 1457 EXPORT_SYMBOL_GPL(usbnet_probe); 1458 1459 /*-------------------------------------------------------------------------*/ 1460 1461 /* 1462 * suspend the whole driver as soon as the first interface is suspended 1463 * resume only when the last interface is resumed 1464 */ 1465 1466 int usbnet_suspend (struct usb_interface *intf, pm_message_t message) 1467 { 1468 struct usbnet *dev = usb_get_intfdata(intf); 1469 1470 if (!dev->suspend_count++) { 1471 spin_lock_irq(&dev->txq.lock); 1472 /* don't autosuspend while transmitting */ 1473 if (dev->txq.qlen && (message.event & PM_EVENT_AUTO)) { 1474 spin_unlock_irq(&dev->txq.lock); 1475 return -EBUSY; 1476 } else { 1477 set_bit(EVENT_DEV_ASLEEP, &dev->flags); 1478 spin_unlock_irq(&dev->txq.lock); 1479 } 1480 /* 1481 * accelerate emptying of the rx and queues, to avoid 1482 * having everything error out. 1483 */ 1484 netif_device_detach (dev->net); 1485 usbnet_terminate_urbs(dev); 1486 usb_kill_urb(dev->interrupt); 1487 1488 /* 1489 * reattach so runtime management can use and 1490 * wake the device 1491 */ 1492 netif_device_attach (dev->net); 1493 } 1494 return 0; 1495 } 1496 EXPORT_SYMBOL_GPL(usbnet_suspend); 1497 1498 int usbnet_resume (struct usb_interface *intf) 1499 { 1500 struct usbnet *dev = usb_get_intfdata(intf); 1501 struct sk_buff *skb; 1502 struct urb *res; 1503 int retval; 1504 1505 if (!--dev->suspend_count) { 1506 /* resume interrupt URBs */ 1507 if (dev->interrupt && test_bit(EVENT_DEV_OPEN, &dev->flags)) 1508 usb_submit_urb(dev->interrupt, GFP_NOIO); 1509 1510 spin_lock_irq(&dev->txq.lock); 1511 while ((res = usb_get_from_anchor(&dev->deferred))) { 1512 1513 skb = (struct sk_buff *)res->context; 1514 retval = usb_submit_urb(res, GFP_ATOMIC); 1515 if (retval < 0) { 1516 dev_kfree_skb_any(skb); 1517 usb_free_urb(res); 1518 usb_autopm_put_interface_async(dev->intf); 1519 } else { 1520 dev->net->trans_start = jiffies; 1521 __skb_queue_tail(&dev->txq, skb); 1522 } 1523 } 1524 1525 smp_mb(); 1526 clear_bit(EVENT_DEV_ASLEEP, &dev->flags); 1527 spin_unlock_irq(&dev->txq.lock); 1528 1529 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) { 1530 if (!(dev->txq.qlen >= TX_QLEN(dev))) 1531 netif_start_queue(dev->net); 1532 tasklet_schedule (&dev->bh); 1533 } 1534 } 1535 return 0; 1536 } 1537 EXPORT_SYMBOL_GPL(usbnet_resume); 1538 1539 1540 /*-------------------------------------------------------------------------*/ 1541 1542 static int __init usbnet_init(void) 1543 { 1544 /* Compiler should optimize this out. */ 1545 BUILD_BUG_ON( 1546 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data)); 1547 1548 random_ether_addr(node_id); 1549 return 0; 1550 } 1551 module_init(usbnet_init); 1552 1553 static void __exit usbnet_exit(void) 1554 { 1555 } 1556 module_exit(usbnet_exit); 1557 1558 MODULE_AUTHOR("David Brownell"); 1559 MODULE_DESCRIPTION("USB network driver framework"); 1560 MODULE_LICENSE("GPL"); 1561