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 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags); 332 if (!skb) { 333 netif_dbg(dev, rx_err, dev->net, "no rx skb\n"); 334 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 335 usb_free_urb (urb); 336 return -ENOMEM; 337 } 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 spin_unlock_irqrestore(&q->lock, flags); 593 // during some PM-driven resume scenarios, 594 // these (async) unlinks complete immediately 595 retval = usb_unlink_urb (urb); 596 if (retval != -EINPROGRESS && retval != 0) 597 netdev_dbg(dev->net, "unlink urb err, %d\n", retval); 598 else 599 count++; 600 spin_lock_irqsave(&q->lock, flags); 601 } 602 spin_unlock_irqrestore (&q->lock, flags); 603 return count; 604 } 605 606 // Flush all pending rx urbs 607 // minidrivers may need to do this when the MTU changes 608 609 void usbnet_unlink_rx_urbs(struct usbnet *dev) 610 { 611 if (netif_running(dev->net)) { 612 (void) unlink_urbs (dev, &dev->rxq); 613 tasklet_schedule(&dev->bh); 614 } 615 } 616 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); 617 618 /*-------------------------------------------------------------------------*/ 619 620 // precondition: never called in_interrupt 621 static void usbnet_terminate_urbs(struct usbnet *dev) 622 { 623 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup); 624 DECLARE_WAITQUEUE(wait, current); 625 int temp; 626 627 /* ensure there are no more active urbs */ 628 add_wait_queue(&unlink_wakeup, &wait); 629 set_current_state(TASK_UNINTERRUPTIBLE); 630 dev->wait = &unlink_wakeup; 631 temp = unlink_urbs(dev, &dev->txq) + 632 unlink_urbs(dev, &dev->rxq); 633 634 /* maybe wait for deletions to finish. */ 635 while (!skb_queue_empty(&dev->rxq) 636 && !skb_queue_empty(&dev->txq) 637 && !skb_queue_empty(&dev->done)) { 638 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS)); 639 set_current_state(TASK_UNINTERRUPTIBLE); 640 netif_dbg(dev, ifdown, dev->net, 641 "waited for %d urb completions\n", temp); 642 } 643 set_current_state(TASK_RUNNING); 644 dev->wait = NULL; 645 remove_wait_queue(&unlink_wakeup, &wait); 646 } 647 648 int usbnet_stop (struct net_device *net) 649 { 650 struct usbnet *dev = netdev_priv(net); 651 struct driver_info *info = dev->driver_info; 652 int retval; 653 654 clear_bit(EVENT_DEV_OPEN, &dev->flags); 655 netif_stop_queue (net); 656 657 netif_info(dev, ifdown, dev->net, 658 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n", 659 net->stats.rx_packets, net->stats.tx_packets, 660 net->stats.rx_errors, net->stats.tx_errors); 661 662 /* allow minidriver to stop correctly (wireless devices to turn off 663 * radio etc) */ 664 if (info->stop) { 665 retval = info->stop(dev); 666 if (retval < 0) 667 netif_info(dev, ifdown, dev->net, 668 "stop fail (%d) usbnet usb-%s-%s, %s\n", 669 retval, 670 dev->udev->bus->bus_name, dev->udev->devpath, 671 info->description); 672 } 673 674 if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) 675 usbnet_terminate_urbs(dev); 676 677 usb_kill_urb(dev->interrupt); 678 679 usbnet_purge_paused_rxq(dev); 680 681 /* deferred work (task, timer, softirq) must also stop. 682 * can't flush_scheduled_work() until we drop rtnl (later), 683 * else workers could deadlock; so make workers a NOP. 684 */ 685 dev->flags = 0; 686 del_timer_sync (&dev->delay); 687 tasklet_kill (&dev->bh); 688 if (info->manage_power) 689 info->manage_power(dev, 0); 690 else 691 usb_autopm_put_interface(dev->intf); 692 693 return 0; 694 } 695 EXPORT_SYMBOL_GPL(usbnet_stop); 696 697 /*-------------------------------------------------------------------------*/ 698 699 // posts reads, and enables write queuing 700 701 // precondition: never called in_interrupt 702 703 int usbnet_open (struct net_device *net) 704 { 705 struct usbnet *dev = netdev_priv(net); 706 int retval; 707 struct driver_info *info = dev->driver_info; 708 709 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { 710 netif_info(dev, ifup, dev->net, 711 "resumption fail (%d) usbnet usb-%s-%s, %s\n", 712 retval, 713 dev->udev->bus->bus_name, 714 dev->udev->devpath, 715 info->description); 716 goto done_nopm; 717 } 718 719 // put into "known safe" state 720 if (info->reset && (retval = info->reset (dev)) < 0) { 721 netif_info(dev, ifup, dev->net, 722 "open reset 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; 728 } 729 730 // insist peer be connected 731 if (info->check_connect && (retval = info->check_connect (dev)) < 0) { 732 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval); 733 goto done; 734 } 735 736 /* start any status interrupt transfer */ 737 if (dev->interrupt) { 738 retval = usb_submit_urb (dev->interrupt, GFP_KERNEL); 739 if (retval < 0) { 740 netif_err(dev, ifup, dev->net, 741 "intr submit %d\n", retval); 742 goto done; 743 } 744 } 745 746 set_bit(EVENT_DEV_OPEN, &dev->flags); 747 netif_start_queue (net); 748 netif_info(dev, ifup, dev->net, 749 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n", 750 (int)RX_QLEN(dev), (int)TX_QLEN(dev), 751 dev->net->mtu, 752 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" : 753 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" : 754 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" : 755 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" : 756 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" : 757 "simple"); 758 759 // delay posting reads until we're fully open 760 tasklet_schedule (&dev->bh); 761 if (info->manage_power) { 762 retval = info->manage_power(dev, 1); 763 if (retval < 0) 764 goto done; 765 usb_autopm_put_interface(dev->intf); 766 } 767 return retval; 768 769 done: 770 usb_autopm_put_interface(dev->intf); 771 done_nopm: 772 return retval; 773 } 774 EXPORT_SYMBOL_GPL(usbnet_open); 775 776 /*-------------------------------------------------------------------------*/ 777 778 /* ethtool methods; minidrivers may need to add some more, but 779 * they'll probably want to use this base set. 780 */ 781 782 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd) 783 { 784 struct usbnet *dev = netdev_priv(net); 785 786 if (!dev->mii.mdio_read) 787 return -EOPNOTSUPP; 788 789 return mii_ethtool_gset(&dev->mii, cmd); 790 } 791 EXPORT_SYMBOL_GPL(usbnet_get_settings); 792 793 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd) 794 { 795 struct usbnet *dev = netdev_priv(net); 796 int retval; 797 798 if (!dev->mii.mdio_write) 799 return -EOPNOTSUPP; 800 801 retval = mii_ethtool_sset(&dev->mii, cmd); 802 803 /* link speed/duplex might have changed */ 804 if (dev->driver_info->link_reset) 805 dev->driver_info->link_reset(dev); 806 807 return retval; 808 809 } 810 EXPORT_SYMBOL_GPL(usbnet_set_settings); 811 812 u32 usbnet_get_link (struct net_device *net) 813 { 814 struct usbnet *dev = netdev_priv(net); 815 816 /* If a check_connect is defined, return its result */ 817 if (dev->driver_info->check_connect) 818 return dev->driver_info->check_connect (dev) == 0; 819 820 /* if the device has mii operations, use those */ 821 if (dev->mii.mdio_read) 822 return mii_link_ok(&dev->mii); 823 824 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ 825 return ethtool_op_get_link(net); 826 } 827 EXPORT_SYMBOL_GPL(usbnet_get_link); 828 829 int usbnet_nway_reset(struct net_device *net) 830 { 831 struct usbnet *dev = netdev_priv(net); 832 833 if (!dev->mii.mdio_write) 834 return -EOPNOTSUPP; 835 836 return mii_nway_restart(&dev->mii); 837 } 838 EXPORT_SYMBOL_GPL(usbnet_nway_reset); 839 840 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) 841 { 842 struct usbnet *dev = netdev_priv(net); 843 844 strncpy (info->driver, dev->driver_name, sizeof info->driver); 845 strncpy (info->version, DRIVER_VERSION, sizeof info->version); 846 strncpy (info->fw_version, dev->driver_info->description, 847 sizeof info->fw_version); 848 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); 849 } 850 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); 851 852 u32 usbnet_get_msglevel (struct net_device *net) 853 { 854 struct usbnet *dev = netdev_priv(net); 855 856 return dev->msg_enable; 857 } 858 EXPORT_SYMBOL_GPL(usbnet_get_msglevel); 859 860 void usbnet_set_msglevel (struct net_device *net, u32 level) 861 { 862 struct usbnet *dev = netdev_priv(net); 863 864 dev->msg_enable = level; 865 } 866 EXPORT_SYMBOL_GPL(usbnet_set_msglevel); 867 868 /* drivers may override default ethtool_ops in their bind() routine */ 869 static const struct ethtool_ops usbnet_ethtool_ops = { 870 .get_settings = usbnet_get_settings, 871 .set_settings = usbnet_set_settings, 872 .get_link = usbnet_get_link, 873 .nway_reset = usbnet_nway_reset, 874 .get_drvinfo = usbnet_get_drvinfo, 875 .get_msglevel = usbnet_get_msglevel, 876 .set_msglevel = usbnet_set_msglevel, 877 }; 878 879 /*-------------------------------------------------------------------------*/ 880 881 /* work that cannot be done in interrupt context uses keventd. 882 * 883 * NOTE: with 2.5 we could do more of this using completion callbacks, 884 * especially now that control transfers can be queued. 885 */ 886 static void 887 kevent (struct work_struct *work) 888 { 889 struct usbnet *dev = 890 container_of(work, struct usbnet, kevent); 891 int status; 892 893 /* usb_clear_halt() needs a thread context */ 894 if (test_bit (EVENT_TX_HALT, &dev->flags)) { 895 unlink_urbs (dev, &dev->txq); 896 status = usb_autopm_get_interface(dev->intf); 897 if (status < 0) 898 goto fail_pipe; 899 status = usb_clear_halt (dev->udev, dev->out); 900 usb_autopm_put_interface(dev->intf); 901 if (status < 0 && 902 status != -EPIPE && 903 status != -ESHUTDOWN) { 904 if (netif_msg_tx_err (dev)) 905 fail_pipe: 906 netdev_err(dev->net, "can't clear tx halt, status %d\n", 907 status); 908 } else { 909 clear_bit (EVENT_TX_HALT, &dev->flags); 910 if (status != -ESHUTDOWN) 911 netif_wake_queue (dev->net); 912 } 913 } 914 if (test_bit (EVENT_RX_HALT, &dev->flags)) { 915 unlink_urbs (dev, &dev->rxq); 916 status = usb_autopm_get_interface(dev->intf); 917 if (status < 0) 918 goto fail_halt; 919 status = usb_clear_halt (dev->udev, dev->in); 920 usb_autopm_put_interface(dev->intf); 921 if (status < 0 && 922 status != -EPIPE && 923 status != -ESHUTDOWN) { 924 if (netif_msg_rx_err (dev)) 925 fail_halt: 926 netdev_err(dev->net, "can't clear rx halt, status %d\n", 927 status); 928 } else { 929 clear_bit (EVENT_RX_HALT, &dev->flags); 930 tasklet_schedule (&dev->bh); 931 } 932 } 933 934 /* tasklet could resubmit itself forever if memory is tight */ 935 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { 936 struct urb *urb = NULL; 937 int resched = 1; 938 939 if (netif_running (dev->net)) 940 urb = usb_alloc_urb (0, GFP_KERNEL); 941 else 942 clear_bit (EVENT_RX_MEMORY, &dev->flags); 943 if (urb != NULL) { 944 clear_bit (EVENT_RX_MEMORY, &dev->flags); 945 status = usb_autopm_get_interface(dev->intf); 946 if (status < 0) { 947 usb_free_urb(urb); 948 goto fail_lowmem; 949 } 950 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) 951 resched = 0; 952 usb_autopm_put_interface(dev->intf); 953 fail_lowmem: 954 if (resched) 955 tasklet_schedule (&dev->bh); 956 } 957 } 958 959 if (test_bit (EVENT_LINK_RESET, &dev->flags)) { 960 struct driver_info *info = dev->driver_info; 961 int retval = 0; 962 963 clear_bit (EVENT_LINK_RESET, &dev->flags); 964 status = usb_autopm_get_interface(dev->intf); 965 if (status < 0) 966 goto skip_reset; 967 if(info->link_reset && (retval = info->link_reset(dev)) < 0) { 968 usb_autopm_put_interface(dev->intf); 969 skip_reset: 970 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", 971 retval, 972 dev->udev->bus->bus_name, 973 dev->udev->devpath, 974 info->description); 975 } else { 976 usb_autopm_put_interface(dev->intf); 977 } 978 } 979 980 if (dev->flags) 981 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); 982 } 983 984 /*-------------------------------------------------------------------------*/ 985 986 static void tx_complete (struct urb *urb) 987 { 988 struct sk_buff *skb = (struct sk_buff *) urb->context; 989 struct skb_data *entry = (struct skb_data *) skb->cb; 990 struct usbnet *dev = entry->dev; 991 992 if (urb->status == 0) { 993 if (!(dev->driver_info->flags & FLAG_MULTI_PACKET)) 994 dev->net->stats.tx_packets++; 995 dev->net->stats.tx_bytes += entry->length; 996 } else { 997 dev->net->stats.tx_errors++; 998 999 switch (urb->status) { 1000 case -EPIPE: 1001 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1002 break; 1003 1004 /* software-driven interface shutdown */ 1005 case -ECONNRESET: // async unlink 1006 case -ESHUTDOWN: // hardware gone 1007 break; 1008 1009 // like rx, tx gets controller i/o faults during khubd delays 1010 // and so it uses the same throttling mechanism. 1011 case -EPROTO: 1012 case -ETIME: 1013 case -EILSEQ: 1014 usb_mark_last_busy(dev->udev); 1015 if (!timer_pending (&dev->delay)) { 1016 mod_timer (&dev->delay, 1017 jiffies + THROTTLE_JIFFIES); 1018 netif_dbg(dev, link, dev->net, 1019 "tx throttle %d\n", urb->status); 1020 } 1021 netif_stop_queue (dev->net); 1022 break; 1023 default: 1024 netif_dbg(dev, tx_err, dev->net, 1025 "tx err %d\n", entry->urb->status); 1026 break; 1027 } 1028 } 1029 1030 usb_autopm_put_interface_async(dev->intf); 1031 urb->dev = NULL; 1032 entry->state = tx_done; 1033 defer_bh(dev, skb, &dev->txq); 1034 } 1035 1036 /*-------------------------------------------------------------------------*/ 1037 1038 void usbnet_tx_timeout (struct net_device *net) 1039 { 1040 struct usbnet *dev = netdev_priv(net); 1041 1042 unlink_urbs (dev, &dev->txq); 1043 tasklet_schedule (&dev->bh); 1044 1045 // FIXME: device recovery -- reset? 1046 } 1047 EXPORT_SYMBOL_GPL(usbnet_tx_timeout); 1048 1049 /*-------------------------------------------------------------------------*/ 1050 1051 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, 1052 struct net_device *net) 1053 { 1054 struct usbnet *dev = netdev_priv(net); 1055 int length; 1056 struct urb *urb = NULL; 1057 struct skb_data *entry; 1058 struct driver_info *info = dev->driver_info; 1059 unsigned long flags; 1060 int retval; 1061 1062 if (skb) 1063 skb_tx_timestamp(skb); 1064 1065 // some devices want funky USB-level framing, for 1066 // win32 driver (usually) and/or hardware quirks 1067 if (info->tx_fixup) { 1068 skb = info->tx_fixup (dev, skb, GFP_ATOMIC); 1069 if (!skb) { 1070 if (netif_msg_tx_err(dev)) { 1071 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); 1072 goto drop; 1073 } else { 1074 /* cdc_ncm collected packet; waits for more */ 1075 goto not_drop; 1076 } 1077 } 1078 } 1079 length = skb->len; 1080 1081 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { 1082 netif_dbg(dev, tx_err, dev->net, "no urb\n"); 1083 goto drop; 1084 } 1085 1086 entry = (struct skb_data *) skb->cb; 1087 entry->urb = urb; 1088 entry->dev = dev; 1089 entry->state = tx_start; 1090 entry->length = length; 1091 1092 usb_fill_bulk_urb (urb, dev->udev, dev->out, 1093 skb->data, skb->len, tx_complete, skb); 1094 1095 /* don't assume the hardware handles USB_ZERO_PACKET 1096 * NOTE: strictly conforming cdc-ether devices should expect 1097 * the ZLP here, but ignore the one-byte packet. 1098 * NOTE2: CDC NCM specification is different from CDC ECM when 1099 * handling ZLP/short packets, so cdc_ncm driver will make short 1100 * packet itself if needed. 1101 */ 1102 if (length % dev->maxpacket == 0) { 1103 if (!(info->flags & FLAG_SEND_ZLP)) { 1104 if (!(info->flags & FLAG_MULTI_PACKET)) { 1105 urb->transfer_buffer_length++; 1106 if (skb_tailroom(skb)) { 1107 skb->data[skb->len] = 0; 1108 __skb_put(skb, 1); 1109 } 1110 } 1111 } else 1112 urb->transfer_flags |= URB_ZERO_PACKET; 1113 } 1114 1115 spin_lock_irqsave(&dev->txq.lock, flags); 1116 retval = usb_autopm_get_interface_async(dev->intf); 1117 if (retval < 0) { 1118 spin_unlock_irqrestore(&dev->txq.lock, flags); 1119 goto drop; 1120 } 1121 1122 #ifdef CONFIG_PM 1123 /* if this triggers the device is still a sleep */ 1124 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { 1125 /* transmission will be done in resume */ 1126 usb_anchor_urb(urb, &dev->deferred); 1127 /* no use to process more packets */ 1128 netif_stop_queue(net); 1129 spin_unlock_irqrestore(&dev->txq.lock, flags); 1130 netdev_dbg(dev->net, "Delaying transmission for resumption\n"); 1131 goto deferred; 1132 } 1133 #endif 1134 1135 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { 1136 case -EPIPE: 1137 netif_stop_queue (net); 1138 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1139 usb_autopm_put_interface_async(dev->intf); 1140 break; 1141 default: 1142 usb_autopm_put_interface_async(dev->intf); 1143 netif_dbg(dev, tx_err, dev->net, 1144 "tx: submit urb err %d\n", retval); 1145 break; 1146 case 0: 1147 net->trans_start = jiffies; 1148 __skb_queue_tail (&dev->txq, skb); 1149 if (dev->txq.qlen >= TX_QLEN (dev)) 1150 netif_stop_queue (net); 1151 } 1152 spin_unlock_irqrestore (&dev->txq.lock, flags); 1153 1154 if (retval) { 1155 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); 1156 drop: 1157 dev->net->stats.tx_dropped++; 1158 not_drop: 1159 if (skb) 1160 dev_kfree_skb_any (skb); 1161 usb_free_urb (urb); 1162 } else 1163 netif_dbg(dev, tx_queued, dev->net, 1164 "> tx, len %d, type 0x%x\n", length, skb->protocol); 1165 #ifdef CONFIG_PM 1166 deferred: 1167 #endif 1168 return NETDEV_TX_OK; 1169 } 1170 EXPORT_SYMBOL_GPL(usbnet_start_xmit); 1171 1172 /*-------------------------------------------------------------------------*/ 1173 1174 // tasklet (work deferred from completions, in_irq) or timer 1175 1176 static void usbnet_bh (unsigned long param) 1177 { 1178 struct usbnet *dev = (struct usbnet *) param; 1179 struct sk_buff *skb; 1180 struct skb_data *entry; 1181 1182 while ((skb = skb_dequeue (&dev->done))) { 1183 entry = (struct skb_data *) skb->cb; 1184 switch (entry->state) { 1185 case rx_done: 1186 entry->state = rx_cleanup; 1187 rx_process (dev, skb); 1188 continue; 1189 case tx_done: 1190 case rx_cleanup: 1191 usb_free_urb (entry->urb); 1192 dev_kfree_skb (skb); 1193 continue; 1194 default: 1195 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); 1196 } 1197 } 1198 1199 // waiting for all pending urbs to complete? 1200 if (dev->wait) { 1201 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) { 1202 wake_up (dev->wait); 1203 } 1204 1205 // or are we maybe short a few urbs? 1206 } else if (netif_running (dev->net) && 1207 netif_device_present (dev->net) && 1208 !timer_pending (&dev->delay) && 1209 !test_bit (EVENT_RX_HALT, &dev->flags)) { 1210 int temp = dev->rxq.qlen; 1211 int qlen = RX_QLEN (dev); 1212 1213 if (temp < qlen) { 1214 struct urb *urb; 1215 int i; 1216 1217 // don't refill the queue all at once 1218 for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) { 1219 urb = usb_alloc_urb (0, GFP_ATOMIC); 1220 if (urb != NULL) { 1221 if (rx_submit (dev, urb, GFP_ATOMIC) == 1222 -ENOLINK) 1223 return; 1224 } 1225 } 1226 if (temp != dev->rxq.qlen) 1227 netif_dbg(dev, link, dev->net, 1228 "rxqlen %d --> %d\n", 1229 temp, dev->rxq.qlen); 1230 if (dev->rxq.qlen < qlen) 1231 tasklet_schedule (&dev->bh); 1232 } 1233 if (dev->txq.qlen < TX_QLEN (dev)) 1234 netif_wake_queue (dev->net); 1235 } 1236 } 1237 1238 1239 /*------------------------------------------------------------------------- 1240 * 1241 * USB Device Driver support 1242 * 1243 *-------------------------------------------------------------------------*/ 1244 1245 // precondition: never called in_interrupt 1246 1247 void usbnet_disconnect (struct usb_interface *intf) 1248 { 1249 struct usbnet *dev; 1250 struct usb_device *xdev; 1251 struct net_device *net; 1252 1253 dev = usb_get_intfdata(intf); 1254 usb_set_intfdata(intf, NULL); 1255 if (!dev) 1256 return; 1257 1258 xdev = interface_to_usbdev (intf); 1259 1260 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", 1261 intf->dev.driver->name, 1262 xdev->bus->bus_name, xdev->devpath, 1263 dev->driver_info->description); 1264 1265 net = dev->net; 1266 unregister_netdev (net); 1267 1268 cancel_work_sync(&dev->kevent); 1269 1270 if (dev->driver_info->unbind) 1271 dev->driver_info->unbind (dev, intf); 1272 1273 usb_kill_urb(dev->interrupt); 1274 usb_free_urb(dev->interrupt); 1275 1276 free_netdev(net); 1277 usb_put_dev (xdev); 1278 } 1279 EXPORT_SYMBOL_GPL(usbnet_disconnect); 1280 1281 static const struct net_device_ops usbnet_netdev_ops = { 1282 .ndo_open = usbnet_open, 1283 .ndo_stop = usbnet_stop, 1284 .ndo_start_xmit = usbnet_start_xmit, 1285 .ndo_tx_timeout = usbnet_tx_timeout, 1286 .ndo_change_mtu = usbnet_change_mtu, 1287 .ndo_set_mac_address = eth_mac_addr, 1288 .ndo_validate_addr = eth_validate_addr, 1289 }; 1290 1291 /*-------------------------------------------------------------------------*/ 1292 1293 // precondition: never called in_interrupt 1294 1295 static struct device_type wlan_type = { 1296 .name = "wlan", 1297 }; 1298 1299 static struct device_type wwan_type = { 1300 .name = "wwan", 1301 }; 1302 1303 int 1304 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) 1305 { 1306 struct usbnet *dev; 1307 struct net_device *net; 1308 struct usb_host_interface *interface; 1309 struct driver_info *info; 1310 struct usb_device *xdev; 1311 int status; 1312 const char *name; 1313 struct usb_driver *driver = to_usb_driver(udev->dev.driver); 1314 1315 /* usbnet already took usb runtime pm, so have to enable the feature 1316 * for usb interface, otherwise usb_autopm_get_interface may return 1317 * failure if USB_SUSPEND(RUNTIME_PM) is enabled. 1318 */ 1319 if (!driver->supports_autosuspend) { 1320 driver->supports_autosuspend = 1; 1321 pm_runtime_enable(&udev->dev); 1322 } 1323 1324 name = udev->dev.driver->name; 1325 info = (struct driver_info *) prod->driver_info; 1326 if (!info) { 1327 dev_dbg (&udev->dev, "blacklisted by %s\n", name); 1328 return -ENODEV; 1329 } 1330 xdev = interface_to_usbdev (udev); 1331 interface = udev->cur_altsetting; 1332 1333 usb_get_dev (xdev); 1334 1335 status = -ENOMEM; 1336 1337 // set up our own records 1338 net = alloc_etherdev(sizeof(*dev)); 1339 if (!net) 1340 goto out; 1341 1342 /* netdev_printk() needs this so do it as early as possible */ 1343 SET_NETDEV_DEV(net, &udev->dev); 1344 1345 dev = netdev_priv(net); 1346 dev->udev = xdev; 1347 dev->intf = udev; 1348 dev->driver_info = info; 1349 dev->driver_name = name; 1350 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV 1351 | NETIF_MSG_PROBE | NETIF_MSG_LINK); 1352 skb_queue_head_init (&dev->rxq); 1353 skb_queue_head_init (&dev->txq); 1354 skb_queue_head_init (&dev->done); 1355 skb_queue_head_init(&dev->rxq_pause); 1356 dev->bh.func = usbnet_bh; 1357 dev->bh.data = (unsigned long) dev; 1358 INIT_WORK (&dev->kevent, kevent); 1359 init_usb_anchor(&dev->deferred); 1360 dev->delay.function = usbnet_bh; 1361 dev->delay.data = (unsigned long) dev; 1362 init_timer (&dev->delay); 1363 mutex_init (&dev->phy_mutex); 1364 1365 dev->net = net; 1366 strcpy (net->name, "usb%d"); 1367 memcpy (net->dev_addr, node_id, sizeof node_id); 1368 1369 /* rx and tx sides can use different message sizes; 1370 * bind() should set rx_urb_size in that case. 1371 */ 1372 dev->hard_mtu = net->mtu + net->hard_header_len; 1373 #if 0 1374 // dma_supported() is deeply broken on almost all architectures 1375 // possible with some EHCI controllers 1376 if (dma_supported (&udev->dev, DMA_BIT_MASK(64))) 1377 net->features |= NETIF_F_HIGHDMA; 1378 #endif 1379 1380 net->netdev_ops = &usbnet_netdev_ops; 1381 net->watchdog_timeo = TX_TIMEOUT_JIFFIES; 1382 net->ethtool_ops = &usbnet_ethtool_ops; 1383 1384 // allow device-specific bind/init procedures 1385 // NOTE net->name still not usable ... 1386 if (info->bind) { 1387 status = info->bind (dev, udev); 1388 if (status < 0) 1389 goto out1; 1390 1391 // heuristic: "usb%d" for links we know are two-host, 1392 // else "eth%d" when there's reasonable doubt. userspace 1393 // can rename the link if it knows better. 1394 if ((dev->driver_info->flags & FLAG_ETHER) != 0 && 1395 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 || 1396 (net->dev_addr [0] & 0x02) == 0)) 1397 strcpy (net->name, "eth%d"); 1398 /* WLAN devices should always be named "wlan%d" */ 1399 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1400 strcpy(net->name, "wlan%d"); 1401 /* WWAN devices should always be named "wwan%d" */ 1402 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1403 strcpy(net->name, "wwan%d"); 1404 1405 /* maybe the remote can't receive an Ethernet MTU */ 1406 if (net->mtu > (dev->hard_mtu - net->hard_header_len)) 1407 net->mtu = dev->hard_mtu - net->hard_header_len; 1408 } else if (!info->in || !info->out) 1409 status = usbnet_get_endpoints (dev, udev); 1410 else { 1411 dev->in = usb_rcvbulkpipe (xdev, info->in); 1412 dev->out = usb_sndbulkpipe (xdev, info->out); 1413 if (!(info->flags & FLAG_NO_SETINT)) 1414 status = usb_set_interface (xdev, 1415 interface->desc.bInterfaceNumber, 1416 interface->desc.bAlternateSetting); 1417 else 1418 status = 0; 1419 1420 } 1421 if (status >= 0 && dev->status) 1422 status = init_status (dev, udev); 1423 if (status < 0) 1424 goto out3; 1425 1426 if (!dev->rx_urb_size) 1427 dev->rx_urb_size = dev->hard_mtu; 1428 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); 1429 1430 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1431 SET_NETDEV_DEVTYPE(net, &wlan_type); 1432 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1433 SET_NETDEV_DEVTYPE(net, &wwan_type); 1434 1435 status = register_netdev (net); 1436 if (status) 1437 goto out3; 1438 netif_info(dev, probe, dev->net, 1439 "register '%s' at usb-%s-%s, %s, %pM\n", 1440 udev->dev.driver->name, 1441 xdev->bus->bus_name, xdev->devpath, 1442 dev->driver_info->description, 1443 net->dev_addr); 1444 1445 // ok, it's ready to go. 1446 usb_set_intfdata (udev, dev); 1447 1448 netif_device_attach (net); 1449 1450 if (dev->driver_info->flags & FLAG_LINK_INTR) 1451 netif_carrier_off(net); 1452 1453 return 0; 1454 1455 out3: 1456 if (info->unbind) 1457 info->unbind (dev, udev); 1458 out1: 1459 free_netdev(net); 1460 out: 1461 usb_put_dev(xdev); 1462 return status; 1463 } 1464 EXPORT_SYMBOL_GPL(usbnet_probe); 1465 1466 /*-------------------------------------------------------------------------*/ 1467 1468 /* 1469 * suspend the whole driver as soon as the first interface is suspended 1470 * resume only when the last interface is resumed 1471 */ 1472 1473 int usbnet_suspend (struct usb_interface *intf, pm_message_t message) 1474 { 1475 struct usbnet *dev = usb_get_intfdata(intf); 1476 1477 if (!dev->suspend_count++) { 1478 spin_lock_irq(&dev->txq.lock); 1479 /* don't autosuspend while transmitting */ 1480 if (dev->txq.qlen && PMSG_IS_AUTO(message)) { 1481 spin_unlock_irq(&dev->txq.lock); 1482 return -EBUSY; 1483 } else { 1484 set_bit(EVENT_DEV_ASLEEP, &dev->flags); 1485 spin_unlock_irq(&dev->txq.lock); 1486 } 1487 /* 1488 * accelerate emptying of the rx and queues, to avoid 1489 * having everything error out. 1490 */ 1491 netif_device_detach (dev->net); 1492 usbnet_terminate_urbs(dev); 1493 usb_kill_urb(dev->interrupt); 1494 1495 /* 1496 * reattach so runtime management can use and 1497 * wake the device 1498 */ 1499 netif_device_attach (dev->net); 1500 } 1501 return 0; 1502 } 1503 EXPORT_SYMBOL_GPL(usbnet_suspend); 1504 1505 int usbnet_resume (struct usb_interface *intf) 1506 { 1507 struct usbnet *dev = usb_get_intfdata(intf); 1508 struct sk_buff *skb; 1509 struct urb *res; 1510 int retval; 1511 1512 if (!--dev->suspend_count) { 1513 /* resume interrupt URBs */ 1514 if (dev->interrupt && test_bit(EVENT_DEV_OPEN, &dev->flags)) 1515 usb_submit_urb(dev->interrupt, GFP_NOIO); 1516 1517 spin_lock_irq(&dev->txq.lock); 1518 while ((res = usb_get_from_anchor(&dev->deferred))) { 1519 1520 skb = (struct sk_buff *)res->context; 1521 retval = usb_submit_urb(res, GFP_ATOMIC); 1522 if (retval < 0) { 1523 dev_kfree_skb_any(skb); 1524 usb_free_urb(res); 1525 usb_autopm_put_interface_async(dev->intf); 1526 } else { 1527 dev->net->trans_start = jiffies; 1528 __skb_queue_tail(&dev->txq, skb); 1529 } 1530 } 1531 1532 smp_mb(); 1533 clear_bit(EVENT_DEV_ASLEEP, &dev->flags); 1534 spin_unlock_irq(&dev->txq.lock); 1535 1536 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) { 1537 if (!(dev->txq.qlen >= TX_QLEN(dev))) 1538 netif_tx_wake_all_queues(dev->net); 1539 tasklet_schedule (&dev->bh); 1540 } 1541 } 1542 return 0; 1543 } 1544 EXPORT_SYMBOL_GPL(usbnet_resume); 1545 1546 1547 /*-------------------------------------------------------------------------*/ 1548 1549 static int __init usbnet_init(void) 1550 { 1551 /* Compiler should optimize this out. */ 1552 BUILD_BUG_ON( 1553 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data)); 1554 1555 random_ether_addr(node_id); 1556 return 0; 1557 } 1558 module_init(usbnet_init); 1559 1560 static void __exit usbnet_exit(void) 1561 { 1562 } 1563 module_exit(usbnet_exit); 1564 1565 MODULE_AUTHOR("David Brownell"); 1566 MODULE_DESCRIPTION("USB network driver framework"); 1567 MODULE_LICENSE("GPL"); 1568