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->interrupt->transfer_flags |= URB_FREE_BUFFER; 214 dev_dbg(&intf->dev, 215 "status ep%din, %d bytes period %d\n", 216 usb_pipeendpoint(pipe), maxp, period); 217 } 218 } 219 return 0; 220 } 221 222 /* Passes this packet up the stack, updating its accounting. 223 * Some link protocols batch packets, so their rx_fixup paths 224 * can return clones as well as just modify the original skb. 225 */ 226 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb) 227 { 228 int status; 229 230 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) { 231 skb_queue_tail(&dev->rxq_pause, skb); 232 return; 233 } 234 235 skb->protocol = eth_type_trans (skb, dev->net); 236 dev->net->stats.rx_packets++; 237 dev->net->stats.rx_bytes += skb->len; 238 239 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n", 240 skb->len + sizeof (struct ethhdr), skb->protocol); 241 memset (skb->cb, 0, sizeof (struct skb_data)); 242 243 if (skb_defer_rx_timestamp(skb)) 244 return; 245 246 status = netif_rx (skb); 247 if (status != NET_RX_SUCCESS) 248 netif_dbg(dev, rx_err, dev->net, 249 "netif_rx status %d\n", status); 250 } 251 EXPORT_SYMBOL_GPL(usbnet_skb_return); 252 253 254 /*------------------------------------------------------------------------- 255 * 256 * Network Device Driver (peer link to "Host Device", from USB host) 257 * 258 *-------------------------------------------------------------------------*/ 259 260 int usbnet_change_mtu (struct net_device *net, int new_mtu) 261 { 262 struct usbnet *dev = netdev_priv(net); 263 int ll_mtu = new_mtu + net->hard_header_len; 264 int old_hard_mtu = dev->hard_mtu; 265 int old_rx_urb_size = dev->rx_urb_size; 266 267 if (new_mtu <= 0) 268 return -EINVAL; 269 // no second zero-length packet read wanted after mtu-sized packets 270 if ((ll_mtu % dev->maxpacket) == 0) 271 return -EDOM; 272 net->mtu = new_mtu; 273 274 dev->hard_mtu = net->mtu + net->hard_header_len; 275 if (dev->rx_urb_size == old_hard_mtu) { 276 dev->rx_urb_size = dev->hard_mtu; 277 if (dev->rx_urb_size > old_rx_urb_size) 278 usbnet_unlink_rx_urbs(dev); 279 } 280 281 return 0; 282 } 283 EXPORT_SYMBOL_GPL(usbnet_change_mtu); 284 285 /*-------------------------------------------------------------------------*/ 286 287 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from 288 * completion callbacks. 2.5 should have fixed those bugs... 289 */ 290 291 static void defer_bh(struct usbnet *dev, struct sk_buff *skb, struct sk_buff_head *list) 292 { 293 unsigned long flags; 294 295 spin_lock_irqsave(&list->lock, flags); 296 __skb_unlink(skb, list); 297 spin_unlock(&list->lock); 298 spin_lock(&dev->done.lock); 299 __skb_queue_tail(&dev->done, skb); 300 if (dev->done.qlen == 1) 301 tasklet_schedule(&dev->bh); 302 spin_unlock_irqrestore(&dev->done.lock, flags); 303 } 304 305 /* some work can't be done in tasklets, so we use keventd 306 * 307 * NOTE: annoying asymmetry: if it's active, schedule_work() fails, 308 * but tasklet_schedule() doesn't. hope the failure is rare. 309 */ 310 void usbnet_defer_kevent (struct usbnet *dev, int work) 311 { 312 set_bit (work, &dev->flags); 313 if (!schedule_work (&dev->kevent)) 314 netdev_err(dev->net, "kevent %d may have been dropped\n", work); 315 else 316 netdev_dbg(dev->net, "kevent %d scheduled\n", work); 317 } 318 EXPORT_SYMBOL_GPL(usbnet_defer_kevent); 319 320 /*-------------------------------------------------------------------------*/ 321 322 static void rx_complete (struct urb *urb); 323 324 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) 325 { 326 struct sk_buff *skb; 327 struct skb_data *entry; 328 int retval = 0; 329 unsigned long lockflags; 330 size_t size = dev->rx_urb_size; 331 332 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags); 333 if (!skb) { 334 netif_dbg(dev, rx_err, dev->net, "no rx skb\n"); 335 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 336 usb_free_urb (urb); 337 return -ENOMEM; 338 } 339 340 entry = (struct skb_data *) skb->cb; 341 entry->urb = urb; 342 entry->dev = dev; 343 entry->state = rx_start; 344 entry->length = 0; 345 346 usb_fill_bulk_urb (urb, dev->udev, dev->in, 347 skb->data, size, rx_complete, skb); 348 349 spin_lock_irqsave (&dev->rxq.lock, lockflags); 350 351 if (netif_running (dev->net) && 352 netif_device_present (dev->net) && 353 !test_bit (EVENT_RX_HALT, &dev->flags) && 354 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) { 355 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) { 356 case -EPIPE: 357 usbnet_defer_kevent (dev, EVENT_RX_HALT); 358 break; 359 case -ENOMEM: 360 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 361 break; 362 case -ENODEV: 363 netif_dbg(dev, ifdown, dev->net, "device gone\n"); 364 netif_device_detach (dev->net); 365 break; 366 case -EHOSTUNREACH: 367 retval = -ENOLINK; 368 break; 369 default: 370 netif_dbg(dev, rx_err, dev->net, 371 "rx submit, %d\n", retval); 372 tasklet_schedule (&dev->bh); 373 break; 374 case 0: 375 __skb_queue_tail (&dev->rxq, skb); 376 } 377 } else { 378 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n"); 379 retval = -ENOLINK; 380 } 381 spin_unlock_irqrestore (&dev->rxq.lock, lockflags); 382 if (retval) { 383 dev_kfree_skb_any (skb); 384 usb_free_urb (urb); 385 } 386 return retval; 387 } 388 389 390 /*-------------------------------------------------------------------------*/ 391 392 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb) 393 { 394 if (dev->driver_info->rx_fixup && 395 !dev->driver_info->rx_fixup (dev, skb)) { 396 /* With RX_ASSEMBLE, rx_fixup() must update counters */ 397 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE)) 398 dev->net->stats.rx_errors++; 399 goto done; 400 } 401 // else network stack removes extra byte if we forced a short packet 402 403 if (skb->len) { 404 /* all data was already cloned from skb inside the driver */ 405 if (dev->driver_info->flags & FLAG_MULTI_PACKET) 406 dev_kfree_skb_any(skb); 407 else 408 usbnet_skb_return(dev, skb); 409 return; 410 } 411 412 netif_dbg(dev, rx_err, dev->net, "drop\n"); 413 dev->net->stats.rx_errors++; 414 done: 415 skb_queue_tail(&dev->done, skb); 416 } 417 418 /*-------------------------------------------------------------------------*/ 419 420 static void rx_complete (struct urb *urb) 421 { 422 struct sk_buff *skb = (struct sk_buff *) urb->context; 423 struct skb_data *entry = (struct skb_data *) skb->cb; 424 struct usbnet *dev = entry->dev; 425 int urb_status = urb->status; 426 427 skb_put (skb, urb->actual_length); 428 entry->state = rx_done; 429 entry->urb = NULL; 430 431 switch (urb_status) { 432 /* success */ 433 case 0: 434 if (skb->len < dev->net->hard_header_len) { 435 entry->state = rx_cleanup; 436 dev->net->stats.rx_errors++; 437 dev->net->stats.rx_length_errors++; 438 netif_dbg(dev, rx_err, dev->net, 439 "rx length %d\n", skb->len); 440 } 441 break; 442 443 /* stalls need manual reset. this is rare ... except that 444 * when going through USB 2.0 TTs, unplug appears this way. 445 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ 446 * storm, recovering as needed. 447 */ 448 case -EPIPE: 449 dev->net->stats.rx_errors++; 450 usbnet_defer_kevent (dev, EVENT_RX_HALT); 451 // FALLTHROUGH 452 453 /* software-driven interface shutdown */ 454 case -ECONNRESET: /* async unlink */ 455 case -ESHUTDOWN: /* hardware gone */ 456 netif_dbg(dev, ifdown, dev->net, 457 "rx shutdown, code %d\n", urb_status); 458 goto block; 459 460 /* we get controller i/o faults during khubd disconnect() delays. 461 * throttle down resubmits, to avoid log floods; just temporarily, 462 * so we still recover when the fault isn't a khubd delay. 463 */ 464 case -EPROTO: 465 case -ETIME: 466 case -EILSEQ: 467 dev->net->stats.rx_errors++; 468 if (!timer_pending (&dev->delay)) { 469 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); 470 netif_dbg(dev, link, dev->net, 471 "rx throttle %d\n", urb_status); 472 } 473 block: 474 entry->state = rx_cleanup; 475 entry->urb = urb; 476 urb = NULL; 477 break; 478 479 /* data overrun ... flush fifo? */ 480 case -EOVERFLOW: 481 dev->net->stats.rx_over_errors++; 482 // FALLTHROUGH 483 484 default: 485 entry->state = rx_cleanup; 486 dev->net->stats.rx_errors++; 487 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status); 488 break; 489 } 490 491 defer_bh(dev, skb, &dev->rxq); 492 493 if (urb) { 494 if (netif_running (dev->net) && 495 !test_bit (EVENT_RX_HALT, &dev->flags)) { 496 rx_submit (dev, urb, GFP_ATOMIC); 497 usb_mark_last_busy(dev->udev); 498 return; 499 } 500 usb_free_urb (urb); 501 } 502 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n"); 503 } 504 505 static void intr_complete (struct urb *urb) 506 { 507 struct usbnet *dev = urb->context; 508 int status = urb->status; 509 510 switch (status) { 511 /* success */ 512 case 0: 513 dev->driver_info->status(dev, urb); 514 break; 515 516 /* software-driven interface shutdown */ 517 case -ENOENT: /* urb killed */ 518 case -ESHUTDOWN: /* hardware gone */ 519 netif_dbg(dev, ifdown, dev->net, 520 "intr shutdown, code %d\n", status); 521 return; 522 523 /* NOTE: not throttling like RX/TX, since this endpoint 524 * already polls infrequently 525 */ 526 default: 527 netdev_dbg(dev->net, "intr status %d\n", status); 528 break; 529 } 530 531 if (!netif_running (dev->net)) 532 return; 533 534 memset(urb->transfer_buffer, 0, urb->transfer_buffer_length); 535 status = usb_submit_urb (urb, GFP_ATOMIC); 536 if (status != 0) 537 netif_err(dev, timer, dev->net, 538 "intr resubmit --> %d\n", status); 539 } 540 541 /*-------------------------------------------------------------------------*/ 542 void usbnet_pause_rx(struct usbnet *dev) 543 { 544 set_bit(EVENT_RX_PAUSED, &dev->flags); 545 546 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n"); 547 } 548 EXPORT_SYMBOL_GPL(usbnet_pause_rx); 549 550 void usbnet_resume_rx(struct usbnet *dev) 551 { 552 struct sk_buff *skb; 553 int num = 0; 554 555 clear_bit(EVENT_RX_PAUSED, &dev->flags); 556 557 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) { 558 usbnet_skb_return(dev, skb); 559 num++; 560 } 561 562 tasklet_schedule(&dev->bh); 563 564 netif_dbg(dev, rx_status, dev->net, 565 "paused rx queue disabled, %d skbs requeued\n", num); 566 } 567 EXPORT_SYMBOL_GPL(usbnet_resume_rx); 568 569 void usbnet_purge_paused_rxq(struct usbnet *dev) 570 { 571 skb_queue_purge(&dev->rxq_pause); 572 } 573 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq); 574 575 /*-------------------------------------------------------------------------*/ 576 577 // unlink pending rx/tx; completion handlers do all other cleanup 578 579 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) 580 { 581 unsigned long flags; 582 struct sk_buff *skb, *skbnext; 583 int count = 0; 584 585 spin_lock_irqsave (&q->lock, flags); 586 skb_queue_walk_safe(q, skb, skbnext) { 587 struct skb_data *entry; 588 struct urb *urb; 589 int retval; 590 591 entry = (struct skb_data *) skb->cb; 592 urb = entry->urb; 593 594 /* 595 * Get reference count of the URB to avoid it to be 596 * freed during usb_unlink_urb, which may trigger 597 * use-after-free problem inside usb_unlink_urb since 598 * usb_unlink_urb is always racing with .complete 599 * handler(include defer_bh). 600 */ 601 usb_get_urb(urb); 602 spin_unlock_irqrestore(&q->lock, flags); 603 // during some PM-driven resume scenarios, 604 // these (async) unlinks complete immediately 605 retval = usb_unlink_urb (urb); 606 if (retval != -EINPROGRESS && retval != 0) 607 netdev_dbg(dev->net, "unlink urb err, %d\n", retval); 608 else 609 count++; 610 usb_put_urb(urb); 611 spin_lock_irqsave(&q->lock, flags); 612 } 613 spin_unlock_irqrestore (&q->lock, flags); 614 return count; 615 } 616 617 // Flush all pending rx urbs 618 // minidrivers may need to do this when the MTU changes 619 620 void usbnet_unlink_rx_urbs(struct usbnet *dev) 621 { 622 if (netif_running(dev->net)) { 623 (void) unlink_urbs (dev, &dev->rxq); 624 tasklet_schedule(&dev->bh); 625 } 626 } 627 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); 628 629 /*-------------------------------------------------------------------------*/ 630 631 // precondition: never called in_interrupt 632 static void usbnet_terminate_urbs(struct usbnet *dev) 633 { 634 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup); 635 DECLARE_WAITQUEUE(wait, current); 636 int temp; 637 638 /* ensure there are no more active urbs */ 639 add_wait_queue(&unlink_wakeup, &wait); 640 set_current_state(TASK_UNINTERRUPTIBLE); 641 dev->wait = &unlink_wakeup; 642 temp = unlink_urbs(dev, &dev->txq) + 643 unlink_urbs(dev, &dev->rxq); 644 645 /* maybe wait for deletions to finish. */ 646 while (!skb_queue_empty(&dev->rxq) 647 && !skb_queue_empty(&dev->txq) 648 && !skb_queue_empty(&dev->done)) { 649 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS)); 650 set_current_state(TASK_UNINTERRUPTIBLE); 651 netif_dbg(dev, ifdown, dev->net, 652 "waited for %d urb completions\n", temp); 653 } 654 set_current_state(TASK_RUNNING); 655 dev->wait = NULL; 656 remove_wait_queue(&unlink_wakeup, &wait); 657 } 658 659 int usbnet_stop (struct net_device *net) 660 { 661 struct usbnet *dev = netdev_priv(net); 662 struct driver_info *info = dev->driver_info; 663 int retval; 664 665 clear_bit(EVENT_DEV_OPEN, &dev->flags); 666 netif_stop_queue (net); 667 668 netif_info(dev, ifdown, dev->net, 669 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n", 670 net->stats.rx_packets, net->stats.tx_packets, 671 net->stats.rx_errors, net->stats.tx_errors); 672 673 /* allow minidriver to stop correctly (wireless devices to turn off 674 * radio etc) */ 675 if (info->stop) { 676 retval = info->stop(dev); 677 if (retval < 0) 678 netif_info(dev, ifdown, dev->net, 679 "stop fail (%d) usbnet usb-%s-%s, %s\n", 680 retval, 681 dev->udev->bus->bus_name, dev->udev->devpath, 682 info->description); 683 } 684 685 if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) 686 usbnet_terminate_urbs(dev); 687 688 usb_kill_urb(dev->interrupt); 689 690 usbnet_purge_paused_rxq(dev); 691 692 /* deferred work (task, timer, softirq) must also stop. 693 * can't flush_scheduled_work() until we drop rtnl (later), 694 * else workers could deadlock; so make workers a NOP. 695 */ 696 dev->flags = 0; 697 del_timer_sync (&dev->delay); 698 tasklet_kill (&dev->bh); 699 if (info->manage_power) 700 info->manage_power(dev, 0); 701 else 702 usb_autopm_put_interface(dev->intf); 703 704 return 0; 705 } 706 EXPORT_SYMBOL_GPL(usbnet_stop); 707 708 /*-------------------------------------------------------------------------*/ 709 710 // posts reads, and enables write queuing 711 712 // precondition: never called in_interrupt 713 714 int usbnet_open (struct net_device *net) 715 { 716 struct usbnet *dev = netdev_priv(net); 717 int retval; 718 struct driver_info *info = dev->driver_info; 719 720 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { 721 netif_info(dev, ifup, dev->net, 722 "resumption fail (%d) usbnet usb-%s-%s, %s\n", 723 retval, 724 dev->udev->bus->bus_name, 725 dev->udev->devpath, 726 info->description); 727 goto done_nopm; 728 } 729 730 // put into "known safe" state 731 if (info->reset && (retval = info->reset (dev)) < 0) { 732 netif_info(dev, ifup, dev->net, 733 "open reset fail (%d) usbnet usb-%s-%s, %s\n", 734 retval, 735 dev->udev->bus->bus_name, 736 dev->udev->devpath, 737 info->description); 738 goto done; 739 } 740 741 // insist peer be connected 742 if (info->check_connect && (retval = info->check_connect (dev)) < 0) { 743 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval); 744 goto done; 745 } 746 747 /* start any status interrupt transfer */ 748 if (dev->interrupt) { 749 retval = usb_submit_urb (dev->interrupt, GFP_KERNEL); 750 if (retval < 0) { 751 netif_err(dev, ifup, dev->net, 752 "intr submit %d\n", retval); 753 goto done; 754 } 755 } 756 757 set_bit(EVENT_DEV_OPEN, &dev->flags); 758 netif_start_queue (net); 759 netif_info(dev, ifup, dev->net, 760 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n", 761 (int)RX_QLEN(dev), (int)TX_QLEN(dev), 762 dev->net->mtu, 763 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" : 764 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" : 765 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" : 766 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" : 767 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" : 768 "simple"); 769 770 // delay posting reads until we're fully open 771 tasklet_schedule (&dev->bh); 772 if (info->manage_power) { 773 retval = info->manage_power(dev, 1); 774 if (retval < 0) 775 goto done; 776 usb_autopm_put_interface(dev->intf); 777 } 778 return retval; 779 780 done: 781 usb_autopm_put_interface(dev->intf); 782 done_nopm: 783 return retval; 784 } 785 EXPORT_SYMBOL_GPL(usbnet_open); 786 787 /*-------------------------------------------------------------------------*/ 788 789 /* ethtool methods; minidrivers may need to add some more, but 790 * they'll probably want to use this base set. 791 */ 792 793 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd) 794 { 795 struct usbnet *dev = netdev_priv(net); 796 797 if (!dev->mii.mdio_read) 798 return -EOPNOTSUPP; 799 800 return mii_ethtool_gset(&dev->mii, cmd); 801 } 802 EXPORT_SYMBOL_GPL(usbnet_get_settings); 803 804 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd) 805 { 806 struct usbnet *dev = netdev_priv(net); 807 int retval; 808 809 if (!dev->mii.mdio_write) 810 return -EOPNOTSUPP; 811 812 retval = mii_ethtool_sset(&dev->mii, cmd); 813 814 /* link speed/duplex might have changed */ 815 if (dev->driver_info->link_reset) 816 dev->driver_info->link_reset(dev); 817 818 return retval; 819 820 } 821 EXPORT_SYMBOL_GPL(usbnet_set_settings); 822 823 u32 usbnet_get_link (struct net_device *net) 824 { 825 struct usbnet *dev = netdev_priv(net); 826 827 /* If a check_connect is defined, return its result */ 828 if (dev->driver_info->check_connect) 829 return dev->driver_info->check_connect (dev) == 0; 830 831 /* if the device has mii operations, use those */ 832 if (dev->mii.mdio_read) 833 return mii_link_ok(&dev->mii); 834 835 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ 836 return ethtool_op_get_link(net); 837 } 838 EXPORT_SYMBOL_GPL(usbnet_get_link); 839 840 int usbnet_nway_reset(struct net_device *net) 841 { 842 struct usbnet *dev = netdev_priv(net); 843 844 if (!dev->mii.mdio_write) 845 return -EOPNOTSUPP; 846 847 return mii_nway_restart(&dev->mii); 848 } 849 EXPORT_SYMBOL_GPL(usbnet_nway_reset); 850 851 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) 852 { 853 struct usbnet *dev = netdev_priv(net); 854 855 strncpy (info->driver, dev->driver_name, sizeof info->driver); 856 strncpy (info->version, DRIVER_VERSION, sizeof info->version); 857 strncpy (info->fw_version, dev->driver_info->description, 858 sizeof info->fw_version); 859 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); 860 } 861 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); 862 863 u32 usbnet_get_msglevel (struct net_device *net) 864 { 865 struct usbnet *dev = netdev_priv(net); 866 867 return dev->msg_enable; 868 } 869 EXPORT_SYMBOL_GPL(usbnet_get_msglevel); 870 871 void usbnet_set_msglevel (struct net_device *net, u32 level) 872 { 873 struct usbnet *dev = netdev_priv(net); 874 875 dev->msg_enable = level; 876 } 877 EXPORT_SYMBOL_GPL(usbnet_set_msglevel); 878 879 /* drivers may override default ethtool_ops in their bind() routine */ 880 static const struct ethtool_ops usbnet_ethtool_ops = { 881 .get_settings = usbnet_get_settings, 882 .set_settings = usbnet_set_settings, 883 .get_link = usbnet_get_link, 884 .nway_reset = usbnet_nway_reset, 885 .get_drvinfo = usbnet_get_drvinfo, 886 .get_msglevel = usbnet_get_msglevel, 887 .set_msglevel = usbnet_set_msglevel, 888 }; 889 890 /*-------------------------------------------------------------------------*/ 891 892 /* work that cannot be done in interrupt context uses keventd. 893 * 894 * NOTE: with 2.5 we could do more of this using completion callbacks, 895 * especially now that control transfers can be queued. 896 */ 897 static void 898 kevent (struct work_struct *work) 899 { 900 struct usbnet *dev = 901 container_of(work, struct usbnet, kevent); 902 int status; 903 904 /* usb_clear_halt() needs a thread context */ 905 if (test_bit (EVENT_TX_HALT, &dev->flags)) { 906 unlink_urbs (dev, &dev->txq); 907 status = usb_autopm_get_interface(dev->intf); 908 if (status < 0) 909 goto fail_pipe; 910 status = usb_clear_halt (dev->udev, dev->out); 911 usb_autopm_put_interface(dev->intf); 912 if (status < 0 && 913 status != -EPIPE && 914 status != -ESHUTDOWN) { 915 if (netif_msg_tx_err (dev)) 916 fail_pipe: 917 netdev_err(dev->net, "can't clear tx halt, status %d\n", 918 status); 919 } else { 920 clear_bit (EVENT_TX_HALT, &dev->flags); 921 if (status != -ESHUTDOWN) 922 netif_wake_queue (dev->net); 923 } 924 } 925 if (test_bit (EVENT_RX_HALT, &dev->flags)) { 926 unlink_urbs (dev, &dev->rxq); 927 status = usb_autopm_get_interface(dev->intf); 928 if (status < 0) 929 goto fail_halt; 930 status = usb_clear_halt (dev->udev, dev->in); 931 usb_autopm_put_interface(dev->intf); 932 if (status < 0 && 933 status != -EPIPE && 934 status != -ESHUTDOWN) { 935 if (netif_msg_rx_err (dev)) 936 fail_halt: 937 netdev_err(dev->net, "can't clear rx halt, status %d\n", 938 status); 939 } else { 940 clear_bit (EVENT_RX_HALT, &dev->flags); 941 tasklet_schedule (&dev->bh); 942 } 943 } 944 945 /* tasklet could resubmit itself forever if memory is tight */ 946 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { 947 struct urb *urb = NULL; 948 int resched = 1; 949 950 if (netif_running (dev->net)) 951 urb = usb_alloc_urb (0, GFP_KERNEL); 952 else 953 clear_bit (EVENT_RX_MEMORY, &dev->flags); 954 if (urb != NULL) { 955 clear_bit (EVENT_RX_MEMORY, &dev->flags); 956 status = usb_autopm_get_interface(dev->intf); 957 if (status < 0) { 958 usb_free_urb(urb); 959 goto fail_lowmem; 960 } 961 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) 962 resched = 0; 963 usb_autopm_put_interface(dev->intf); 964 fail_lowmem: 965 if (resched) 966 tasklet_schedule (&dev->bh); 967 } 968 } 969 970 if (test_bit (EVENT_LINK_RESET, &dev->flags)) { 971 struct driver_info *info = dev->driver_info; 972 int retval = 0; 973 974 clear_bit (EVENT_LINK_RESET, &dev->flags); 975 status = usb_autopm_get_interface(dev->intf); 976 if (status < 0) 977 goto skip_reset; 978 if(info->link_reset && (retval = info->link_reset(dev)) < 0) { 979 usb_autopm_put_interface(dev->intf); 980 skip_reset: 981 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", 982 retval, 983 dev->udev->bus->bus_name, 984 dev->udev->devpath, 985 info->description); 986 } else { 987 usb_autopm_put_interface(dev->intf); 988 } 989 } 990 991 if (dev->flags) 992 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); 993 } 994 995 /*-------------------------------------------------------------------------*/ 996 997 static void tx_complete (struct urb *urb) 998 { 999 struct sk_buff *skb = (struct sk_buff *) urb->context; 1000 struct skb_data *entry = (struct skb_data *) skb->cb; 1001 struct usbnet *dev = entry->dev; 1002 1003 if (urb->status == 0) { 1004 if (!(dev->driver_info->flags & FLAG_MULTI_PACKET)) 1005 dev->net->stats.tx_packets++; 1006 dev->net->stats.tx_bytes += entry->length; 1007 } else { 1008 dev->net->stats.tx_errors++; 1009 1010 switch (urb->status) { 1011 case -EPIPE: 1012 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1013 break; 1014 1015 /* software-driven interface shutdown */ 1016 case -ECONNRESET: // async unlink 1017 case -ESHUTDOWN: // hardware gone 1018 break; 1019 1020 // like rx, tx gets controller i/o faults during khubd delays 1021 // and so it uses the same throttling mechanism. 1022 case -EPROTO: 1023 case -ETIME: 1024 case -EILSEQ: 1025 usb_mark_last_busy(dev->udev); 1026 if (!timer_pending (&dev->delay)) { 1027 mod_timer (&dev->delay, 1028 jiffies + THROTTLE_JIFFIES); 1029 netif_dbg(dev, link, dev->net, 1030 "tx throttle %d\n", urb->status); 1031 } 1032 netif_stop_queue (dev->net); 1033 break; 1034 default: 1035 netif_dbg(dev, tx_err, dev->net, 1036 "tx err %d\n", entry->urb->status); 1037 break; 1038 } 1039 } 1040 1041 usb_autopm_put_interface_async(dev->intf); 1042 entry->state = tx_done; 1043 defer_bh(dev, skb, &dev->txq); 1044 } 1045 1046 /*-------------------------------------------------------------------------*/ 1047 1048 void usbnet_tx_timeout (struct net_device *net) 1049 { 1050 struct usbnet *dev = netdev_priv(net); 1051 1052 unlink_urbs (dev, &dev->txq); 1053 tasklet_schedule (&dev->bh); 1054 1055 // FIXME: device recovery -- reset? 1056 } 1057 EXPORT_SYMBOL_GPL(usbnet_tx_timeout); 1058 1059 /*-------------------------------------------------------------------------*/ 1060 1061 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, 1062 struct net_device *net) 1063 { 1064 struct usbnet *dev = netdev_priv(net); 1065 int length; 1066 struct urb *urb = NULL; 1067 struct skb_data *entry; 1068 struct driver_info *info = dev->driver_info; 1069 unsigned long flags; 1070 int retval; 1071 1072 if (skb) 1073 skb_tx_timestamp(skb); 1074 1075 // some devices want funky USB-level framing, for 1076 // win32 driver (usually) and/or hardware quirks 1077 if (info->tx_fixup) { 1078 skb = info->tx_fixup (dev, skb, GFP_ATOMIC); 1079 if (!skb) { 1080 if (netif_msg_tx_err(dev)) { 1081 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); 1082 goto drop; 1083 } else { 1084 /* cdc_ncm collected packet; waits for more */ 1085 goto not_drop; 1086 } 1087 } 1088 } 1089 length = skb->len; 1090 1091 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { 1092 netif_dbg(dev, tx_err, dev->net, "no urb\n"); 1093 goto drop; 1094 } 1095 1096 entry = (struct skb_data *) skb->cb; 1097 entry->urb = urb; 1098 entry->dev = dev; 1099 entry->state = tx_start; 1100 entry->length = length; 1101 1102 usb_fill_bulk_urb (urb, dev->udev, dev->out, 1103 skb->data, skb->len, tx_complete, skb); 1104 1105 /* don't assume the hardware handles USB_ZERO_PACKET 1106 * NOTE: strictly conforming cdc-ether devices should expect 1107 * the ZLP here, but ignore the one-byte packet. 1108 * NOTE2: CDC NCM specification is different from CDC ECM when 1109 * handling ZLP/short packets, so cdc_ncm driver will make short 1110 * packet itself if needed. 1111 */ 1112 if (length % dev->maxpacket == 0) { 1113 if (!(info->flags & FLAG_SEND_ZLP)) { 1114 if (!(info->flags & FLAG_MULTI_PACKET)) { 1115 urb->transfer_buffer_length++; 1116 if (skb_tailroom(skb)) { 1117 skb->data[skb->len] = 0; 1118 __skb_put(skb, 1); 1119 } 1120 } 1121 } else 1122 urb->transfer_flags |= URB_ZERO_PACKET; 1123 } 1124 1125 spin_lock_irqsave(&dev->txq.lock, flags); 1126 retval = usb_autopm_get_interface_async(dev->intf); 1127 if (retval < 0) { 1128 spin_unlock_irqrestore(&dev->txq.lock, flags); 1129 goto drop; 1130 } 1131 1132 #ifdef CONFIG_PM 1133 /* if this triggers the device is still a sleep */ 1134 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { 1135 /* transmission will be done in resume */ 1136 usb_anchor_urb(urb, &dev->deferred); 1137 /* no use to process more packets */ 1138 netif_stop_queue(net); 1139 spin_unlock_irqrestore(&dev->txq.lock, flags); 1140 netdev_dbg(dev->net, "Delaying transmission for resumption\n"); 1141 goto deferred; 1142 } 1143 #endif 1144 1145 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { 1146 case -EPIPE: 1147 netif_stop_queue (net); 1148 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1149 usb_autopm_put_interface_async(dev->intf); 1150 break; 1151 default: 1152 usb_autopm_put_interface_async(dev->intf); 1153 netif_dbg(dev, tx_err, dev->net, 1154 "tx: submit urb err %d\n", retval); 1155 break; 1156 case 0: 1157 net->trans_start = jiffies; 1158 __skb_queue_tail (&dev->txq, skb); 1159 if (dev->txq.qlen >= TX_QLEN (dev)) 1160 netif_stop_queue (net); 1161 } 1162 spin_unlock_irqrestore (&dev->txq.lock, flags); 1163 1164 if (retval) { 1165 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); 1166 drop: 1167 dev->net->stats.tx_dropped++; 1168 not_drop: 1169 if (skb) 1170 dev_kfree_skb_any (skb); 1171 usb_free_urb (urb); 1172 } else 1173 netif_dbg(dev, tx_queued, dev->net, 1174 "> tx, len %d, type 0x%x\n", length, skb->protocol); 1175 #ifdef CONFIG_PM 1176 deferred: 1177 #endif 1178 return NETDEV_TX_OK; 1179 } 1180 EXPORT_SYMBOL_GPL(usbnet_start_xmit); 1181 1182 /*-------------------------------------------------------------------------*/ 1183 1184 // tasklet (work deferred from completions, in_irq) or timer 1185 1186 static void usbnet_bh (unsigned long param) 1187 { 1188 struct usbnet *dev = (struct usbnet *) param; 1189 struct sk_buff *skb; 1190 struct skb_data *entry; 1191 1192 while ((skb = skb_dequeue (&dev->done))) { 1193 entry = (struct skb_data *) skb->cb; 1194 switch (entry->state) { 1195 case rx_done: 1196 entry->state = rx_cleanup; 1197 rx_process (dev, skb); 1198 continue; 1199 case tx_done: 1200 case rx_cleanup: 1201 usb_free_urb (entry->urb); 1202 dev_kfree_skb (skb); 1203 continue; 1204 default: 1205 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); 1206 } 1207 } 1208 1209 // waiting for all pending urbs to complete? 1210 if (dev->wait) { 1211 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) { 1212 wake_up (dev->wait); 1213 } 1214 1215 // or are we maybe short a few urbs? 1216 } else if (netif_running (dev->net) && 1217 netif_device_present (dev->net) && 1218 !timer_pending (&dev->delay) && 1219 !test_bit (EVENT_RX_HALT, &dev->flags)) { 1220 int temp = dev->rxq.qlen; 1221 int qlen = RX_QLEN (dev); 1222 1223 if (temp < qlen) { 1224 struct urb *urb; 1225 int i; 1226 1227 // don't refill the queue all at once 1228 for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) { 1229 urb = usb_alloc_urb (0, GFP_ATOMIC); 1230 if (urb != NULL) { 1231 if (rx_submit (dev, urb, GFP_ATOMIC) == 1232 -ENOLINK) 1233 return; 1234 } 1235 } 1236 if (temp != dev->rxq.qlen) 1237 netif_dbg(dev, link, dev->net, 1238 "rxqlen %d --> %d\n", 1239 temp, dev->rxq.qlen); 1240 if (dev->rxq.qlen < qlen) 1241 tasklet_schedule (&dev->bh); 1242 } 1243 if (dev->txq.qlen < TX_QLEN (dev)) 1244 netif_wake_queue (dev->net); 1245 } 1246 } 1247 1248 1249 /*------------------------------------------------------------------------- 1250 * 1251 * USB Device Driver support 1252 * 1253 *-------------------------------------------------------------------------*/ 1254 1255 // precondition: never called in_interrupt 1256 1257 void usbnet_disconnect (struct usb_interface *intf) 1258 { 1259 struct usbnet *dev; 1260 struct usb_device *xdev; 1261 struct net_device *net; 1262 1263 dev = usb_get_intfdata(intf); 1264 usb_set_intfdata(intf, NULL); 1265 if (!dev) 1266 return; 1267 1268 xdev = interface_to_usbdev (intf); 1269 1270 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", 1271 intf->dev.driver->name, 1272 xdev->bus->bus_name, xdev->devpath, 1273 dev->driver_info->description); 1274 1275 net = dev->net; 1276 unregister_netdev (net); 1277 1278 cancel_work_sync(&dev->kevent); 1279 1280 if (dev->driver_info->unbind) 1281 dev->driver_info->unbind (dev, intf); 1282 1283 usb_kill_urb(dev->interrupt); 1284 usb_free_urb(dev->interrupt); 1285 1286 free_netdev(net); 1287 usb_put_dev (xdev); 1288 } 1289 EXPORT_SYMBOL_GPL(usbnet_disconnect); 1290 1291 static const struct net_device_ops usbnet_netdev_ops = { 1292 .ndo_open = usbnet_open, 1293 .ndo_stop = usbnet_stop, 1294 .ndo_start_xmit = usbnet_start_xmit, 1295 .ndo_tx_timeout = usbnet_tx_timeout, 1296 .ndo_change_mtu = usbnet_change_mtu, 1297 .ndo_set_mac_address = eth_mac_addr, 1298 .ndo_validate_addr = eth_validate_addr, 1299 }; 1300 1301 /*-------------------------------------------------------------------------*/ 1302 1303 // precondition: never called in_interrupt 1304 1305 static struct device_type wlan_type = { 1306 .name = "wlan", 1307 }; 1308 1309 static struct device_type wwan_type = { 1310 .name = "wwan", 1311 }; 1312 1313 int 1314 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) 1315 { 1316 struct usbnet *dev; 1317 struct net_device *net; 1318 struct usb_host_interface *interface; 1319 struct driver_info *info; 1320 struct usb_device *xdev; 1321 int status; 1322 const char *name; 1323 struct usb_driver *driver = to_usb_driver(udev->dev.driver); 1324 1325 /* usbnet already took usb runtime pm, so have to enable the feature 1326 * for usb interface, otherwise usb_autopm_get_interface may return 1327 * failure if USB_SUSPEND(RUNTIME_PM) is enabled. 1328 */ 1329 if (!driver->supports_autosuspend) { 1330 driver->supports_autosuspend = 1; 1331 pm_runtime_enable(&udev->dev); 1332 } 1333 1334 name = udev->dev.driver->name; 1335 info = (struct driver_info *) prod->driver_info; 1336 if (!info) { 1337 dev_dbg (&udev->dev, "blacklisted by %s\n", name); 1338 return -ENODEV; 1339 } 1340 xdev = interface_to_usbdev (udev); 1341 interface = udev->cur_altsetting; 1342 1343 usb_get_dev (xdev); 1344 1345 status = -ENOMEM; 1346 1347 // set up our own records 1348 net = alloc_etherdev(sizeof(*dev)); 1349 if (!net) 1350 goto out; 1351 1352 /* netdev_printk() needs this so do it as early as possible */ 1353 SET_NETDEV_DEV(net, &udev->dev); 1354 1355 dev = netdev_priv(net); 1356 dev->udev = xdev; 1357 dev->intf = udev; 1358 dev->driver_info = info; 1359 dev->driver_name = name; 1360 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV 1361 | NETIF_MSG_PROBE | NETIF_MSG_LINK); 1362 skb_queue_head_init (&dev->rxq); 1363 skb_queue_head_init (&dev->txq); 1364 skb_queue_head_init (&dev->done); 1365 skb_queue_head_init(&dev->rxq_pause); 1366 dev->bh.func = usbnet_bh; 1367 dev->bh.data = (unsigned long) dev; 1368 INIT_WORK (&dev->kevent, kevent); 1369 init_usb_anchor(&dev->deferred); 1370 dev->delay.function = usbnet_bh; 1371 dev->delay.data = (unsigned long) dev; 1372 init_timer (&dev->delay); 1373 mutex_init (&dev->phy_mutex); 1374 1375 dev->net = net; 1376 strcpy (net->name, "usb%d"); 1377 memcpy (net->dev_addr, node_id, sizeof node_id); 1378 1379 /* rx and tx sides can use different message sizes; 1380 * bind() should set rx_urb_size in that case. 1381 */ 1382 dev->hard_mtu = net->mtu + net->hard_header_len; 1383 #if 0 1384 // dma_supported() is deeply broken on almost all architectures 1385 // possible with some EHCI controllers 1386 if (dma_supported (&udev->dev, DMA_BIT_MASK(64))) 1387 net->features |= NETIF_F_HIGHDMA; 1388 #endif 1389 1390 net->netdev_ops = &usbnet_netdev_ops; 1391 net->watchdog_timeo = TX_TIMEOUT_JIFFIES; 1392 net->ethtool_ops = &usbnet_ethtool_ops; 1393 1394 // allow device-specific bind/init procedures 1395 // NOTE net->name still not usable ... 1396 if (info->bind) { 1397 status = info->bind (dev, udev); 1398 if (status < 0) 1399 goto out1; 1400 1401 // heuristic: "usb%d" for links we know are two-host, 1402 // else "eth%d" when there's reasonable doubt. userspace 1403 // can rename the link if it knows better. 1404 if ((dev->driver_info->flags & FLAG_ETHER) != 0 && 1405 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 || 1406 (net->dev_addr [0] & 0x02) == 0)) 1407 strcpy (net->name, "eth%d"); 1408 /* WLAN devices should always be named "wlan%d" */ 1409 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1410 strcpy(net->name, "wlan%d"); 1411 /* WWAN devices should always be named "wwan%d" */ 1412 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1413 strcpy(net->name, "wwan%d"); 1414 1415 /* maybe the remote can't receive an Ethernet MTU */ 1416 if (net->mtu > (dev->hard_mtu - net->hard_header_len)) 1417 net->mtu = dev->hard_mtu - net->hard_header_len; 1418 } else if (!info->in || !info->out) 1419 status = usbnet_get_endpoints (dev, udev); 1420 else { 1421 dev->in = usb_rcvbulkpipe (xdev, info->in); 1422 dev->out = usb_sndbulkpipe (xdev, info->out); 1423 if (!(info->flags & FLAG_NO_SETINT)) 1424 status = usb_set_interface (xdev, 1425 interface->desc.bInterfaceNumber, 1426 interface->desc.bAlternateSetting); 1427 else 1428 status = 0; 1429 1430 } 1431 if (status >= 0 && dev->status) 1432 status = init_status (dev, udev); 1433 if (status < 0) 1434 goto out3; 1435 1436 if (!dev->rx_urb_size) 1437 dev->rx_urb_size = dev->hard_mtu; 1438 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); 1439 1440 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1441 SET_NETDEV_DEVTYPE(net, &wlan_type); 1442 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1443 SET_NETDEV_DEVTYPE(net, &wwan_type); 1444 1445 status = register_netdev (net); 1446 if (status) 1447 goto out4; 1448 netif_info(dev, probe, dev->net, 1449 "register '%s' at usb-%s-%s, %s, %pM\n", 1450 udev->dev.driver->name, 1451 xdev->bus->bus_name, xdev->devpath, 1452 dev->driver_info->description, 1453 net->dev_addr); 1454 1455 // ok, it's ready to go. 1456 usb_set_intfdata (udev, dev); 1457 1458 netif_device_attach (net); 1459 1460 if (dev->driver_info->flags & FLAG_LINK_INTR) 1461 netif_carrier_off(net); 1462 1463 return 0; 1464 1465 out4: 1466 usb_free_urb(dev->interrupt); 1467 out3: 1468 if (info->unbind) 1469 info->unbind (dev, udev); 1470 out1: 1471 free_netdev(net); 1472 out: 1473 usb_put_dev(xdev); 1474 return status; 1475 } 1476 EXPORT_SYMBOL_GPL(usbnet_probe); 1477 1478 /*-------------------------------------------------------------------------*/ 1479 1480 /* 1481 * suspend the whole driver as soon as the first interface is suspended 1482 * resume only when the last interface is resumed 1483 */ 1484 1485 int usbnet_suspend (struct usb_interface *intf, pm_message_t message) 1486 { 1487 struct usbnet *dev = usb_get_intfdata(intf); 1488 1489 if (!dev->suspend_count++) { 1490 spin_lock_irq(&dev->txq.lock); 1491 /* don't autosuspend while transmitting */ 1492 if (dev->txq.qlen && PMSG_IS_AUTO(message)) { 1493 spin_unlock_irq(&dev->txq.lock); 1494 return -EBUSY; 1495 } else { 1496 set_bit(EVENT_DEV_ASLEEP, &dev->flags); 1497 spin_unlock_irq(&dev->txq.lock); 1498 } 1499 /* 1500 * accelerate emptying of the rx and queues, to avoid 1501 * having everything error out. 1502 */ 1503 netif_device_detach (dev->net); 1504 usbnet_terminate_urbs(dev); 1505 usb_kill_urb(dev->interrupt); 1506 1507 /* 1508 * reattach so runtime management can use and 1509 * wake the device 1510 */ 1511 netif_device_attach (dev->net); 1512 } 1513 return 0; 1514 } 1515 EXPORT_SYMBOL_GPL(usbnet_suspend); 1516 1517 int usbnet_resume (struct usb_interface *intf) 1518 { 1519 struct usbnet *dev = usb_get_intfdata(intf); 1520 struct sk_buff *skb; 1521 struct urb *res; 1522 int retval; 1523 1524 if (!--dev->suspend_count) { 1525 /* resume interrupt URBs */ 1526 if (dev->interrupt && test_bit(EVENT_DEV_OPEN, &dev->flags)) 1527 usb_submit_urb(dev->interrupt, GFP_NOIO); 1528 1529 spin_lock_irq(&dev->txq.lock); 1530 while ((res = usb_get_from_anchor(&dev->deferred))) { 1531 1532 skb = (struct sk_buff *)res->context; 1533 retval = usb_submit_urb(res, GFP_ATOMIC); 1534 if (retval < 0) { 1535 dev_kfree_skb_any(skb); 1536 usb_free_urb(res); 1537 usb_autopm_put_interface_async(dev->intf); 1538 } else { 1539 dev->net->trans_start = jiffies; 1540 __skb_queue_tail(&dev->txq, skb); 1541 } 1542 } 1543 1544 smp_mb(); 1545 clear_bit(EVENT_DEV_ASLEEP, &dev->flags); 1546 spin_unlock_irq(&dev->txq.lock); 1547 1548 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) { 1549 if (!(dev->txq.qlen >= TX_QLEN(dev))) 1550 netif_tx_wake_all_queues(dev->net); 1551 tasklet_schedule (&dev->bh); 1552 } 1553 } 1554 return 0; 1555 } 1556 EXPORT_SYMBOL_GPL(usbnet_resume); 1557 1558 1559 /*-------------------------------------------------------------------------*/ 1560 1561 static int __init usbnet_init(void) 1562 { 1563 /* Compiler should optimize this out. */ 1564 BUILD_BUG_ON( 1565 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data)); 1566 1567 random_ether_addr(node_id); 1568 return 0; 1569 } 1570 module_init(usbnet_init); 1571 1572 static void __exit usbnet_exit(void) 1573 { 1574 } 1575 module_exit(usbnet_exit); 1576 1577 MODULE_AUTHOR("David Brownell"); 1578 MODULE_DESCRIPTION("USB network driver framework"); 1579 MODULE_LICENSE("GPL"); 1580