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