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 85static u8 node_id [ETH_ALEN]; 86 87static const char driver_name [] = "usbnet"; 88 89/* use ethtool to change the level for any given device */ 90static int msg_level = -1; 91module_param (msg_level, int, 0); 92MODULE_PARM_DESC (msg_level, "Override default message level"); 93 94/*-------------------------------------------------------------------------*/ 95 96/* handles CDC Ethernet and many other network "bulk data" interfaces */ 97int 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} 161EXPORT_SYMBOL_GPL(usbnet_get_endpoints); 162 163int 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} 181EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr); 182 183static void intr_complete (struct urb *urb); 184 185static int init_status (struct usbnet *dev, struct usb_interface *intf) 186{ 187 char *buf = NULL; 188 unsigned pipe = 0; 189 unsigned maxp; 190 unsigned period; 191 192 if (!dev->driver_info->status) 193 return 0; 194 195 pipe = usb_rcvintpipe (dev->udev, 196 dev->status->desc.bEndpointAddress 197 & USB_ENDPOINT_NUMBER_MASK); 198 maxp = usb_maxpacket (dev->udev, pipe, 0); 199 200 /* avoid 1 msec chatter: min 8 msec poll rate */ 201 period = max ((int) dev->status->desc.bInterval, 202 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3); 203 204 buf = kmalloc (maxp, GFP_KERNEL); 205 if (buf) { 206 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL); 207 if (!dev->interrupt) { 208 kfree (buf); 209 return -ENOMEM; 210 } else { 211 usb_fill_int_urb(dev->interrupt, dev->udev, pipe, 212 buf, maxp, intr_complete, dev, period); 213 dev->interrupt->transfer_flags |= URB_FREE_BUFFER; 214 dev_dbg(&intf->dev, 215 "status ep%din, %d bytes period %d\n", 216 usb_pipeendpoint(pipe), maxp, period); 217 } 218 } 219 return 0; 220} 221 222/* Passes this packet up the stack, updating its accounting. 223 * Some link protocols batch packets, so their rx_fixup paths 224 * can return clones as well as just modify the original skb. 225 */ 226void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb) 227{ 228 int status; 229 230 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) { 231 skb_queue_tail(&dev->rxq_pause, skb); 232 return; 233 } 234 235 skb->protocol = eth_type_trans (skb, dev->net); 236 dev->net->stats.rx_packets++; 237 dev->net->stats.rx_bytes += skb->len; 238 239 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n", 240 skb->len + sizeof (struct ethhdr), skb->protocol); 241 memset (skb->cb, 0, sizeof (struct skb_data)); 242 243 if (skb_defer_rx_timestamp(skb)) 244 return; 245 246 status = netif_rx (skb); 247 if (status != NET_RX_SUCCESS) 248 netif_dbg(dev, rx_err, dev->net, 249 "netif_rx status %d\n", status); 250} 251EXPORT_SYMBOL_GPL(usbnet_skb_return); 252 253 254/*------------------------------------------------------------------------- 255 * 256 * Network Device Driver (peer link to "Host Device", from USB host) 257 * 258 *-------------------------------------------------------------------------*/ 259 260int usbnet_change_mtu (struct net_device *net, int new_mtu) 261{ 262 struct usbnet *dev = netdev_priv(net); 263 int ll_mtu = new_mtu + net->hard_header_len; 264 int old_hard_mtu = dev->hard_mtu; 265 int old_rx_urb_size = dev->rx_urb_size; 266 267 if (new_mtu <= 0) 268 return -EINVAL; 269 // no second zero-length packet read wanted after mtu-sized packets 270 if ((ll_mtu % dev->maxpacket) == 0) 271 return -EDOM; 272 net->mtu = new_mtu; 273 274 dev->hard_mtu = net->mtu + net->hard_header_len; 275 if (dev->rx_urb_size == old_hard_mtu) { 276 dev->rx_urb_size = dev->hard_mtu; 277 if (dev->rx_urb_size > old_rx_urb_size) 278 usbnet_unlink_rx_urbs(dev); 279 } 280 281 return 0; 282} 283EXPORT_SYMBOL_GPL(usbnet_change_mtu); 284 285/* The caller must hold list->lock */ 286static void __usbnet_queue_skb(struct sk_buff_head *list, 287 struct sk_buff *newsk, enum skb_state state) 288{ 289 struct skb_data *entry = (struct skb_data *) newsk->cb; 290 291 __skb_queue_tail(list, newsk); 292 entry->state = state; 293} 294 295/*-------------------------------------------------------------------------*/ 296 297/* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from 298 * completion callbacks. 2.5 should have fixed those bugs... 299 */ 300 301static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb, 302 struct sk_buff_head *list, enum skb_state state) 303{ 304 unsigned long flags; 305 enum skb_state old_state; 306 struct skb_data *entry = (struct skb_data *) skb->cb; 307 308 spin_lock_irqsave(&list->lock, flags); 309 old_state = entry->state; 310 entry->state = state; 311 __skb_unlink(skb, list); 312 spin_unlock(&list->lock); 313 spin_lock(&dev->done.lock); 314 __skb_queue_tail(&dev->done, skb); 315 if (dev->done.qlen == 1) 316 tasklet_schedule(&dev->bh); 317 spin_unlock_irqrestore(&dev->done.lock, flags); 318 return old_state; 319} 320 321/* some work can't be done in tasklets, so we use keventd 322 * 323 * NOTE: annoying asymmetry: if it's active, schedule_work() fails, 324 * but tasklet_schedule() doesn't. hope the failure is rare. 325 */ 326void usbnet_defer_kevent (struct usbnet *dev, int work) 327{ 328 set_bit (work, &dev->flags); 329 if (!schedule_work (&dev->kevent)) 330 netdev_err(dev->net, "kevent %d may have been dropped\n", work); 331 else 332 netdev_dbg(dev->net, "kevent %d scheduled\n", work); 333} 334EXPORT_SYMBOL_GPL(usbnet_defer_kevent); 335 336/*-------------------------------------------------------------------------*/ 337 338static void rx_complete (struct urb *urb); 339 340static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) 341{ 342 struct sk_buff *skb; 343 struct skb_data *entry; 344 int retval = 0; 345 unsigned long lockflags; 346 size_t size = dev->rx_urb_size; 347 348 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags); 349 if (!skb) { 350 netif_dbg(dev, rx_err, dev->net, "no rx skb\n"); 351 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 352 usb_free_urb (urb); 353 return -ENOMEM; 354 } 355 356 entry = (struct skb_data *) skb->cb; 357 entry->urb = urb; 358 entry->dev = dev; 359 entry->length = 0; 360 361 usb_fill_bulk_urb (urb, dev->udev, dev->in, 362 skb->data, size, rx_complete, skb); 363 364 spin_lock_irqsave (&dev->rxq.lock, lockflags); 365 366 if (netif_running (dev->net) && 367 netif_device_present (dev->net) && 368 !test_bit (EVENT_RX_HALT, &dev->flags) && 369 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) { 370 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) { 371 case -EPIPE: 372 usbnet_defer_kevent (dev, EVENT_RX_HALT); 373 break; 374 case -ENOMEM: 375 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 376 break; 377 case -ENODEV: 378 netif_dbg(dev, ifdown, dev->net, "device gone\n"); 379 netif_device_detach (dev->net); 380 break; 381 case -EHOSTUNREACH: 382 retval = -ENOLINK; 383 break; 384 default: 385 netif_dbg(dev, rx_err, dev->net, 386 "rx submit, %d\n", retval); 387 tasklet_schedule (&dev->bh); 388 break; 389 case 0: 390 __usbnet_queue_skb(&dev->rxq, skb, rx_start); 391 } 392 } else { 393 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n"); 394 retval = -ENOLINK; 395 } 396 spin_unlock_irqrestore (&dev->rxq.lock, lockflags); 397 if (retval) { 398 dev_kfree_skb_any (skb); 399 usb_free_urb (urb); 400 } 401 return retval; 402} 403 404 405/*-------------------------------------------------------------------------*/ 406 407static inline void rx_process (struct usbnet *dev, struct sk_buff *skb) 408{ 409 if (dev->driver_info->rx_fixup && 410 !dev->driver_info->rx_fixup (dev, skb)) { 411 /* With RX_ASSEMBLE, rx_fixup() must update counters */ 412 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE)) 413 dev->net->stats.rx_errors++; 414 goto done; 415 } 416 // else network stack removes extra byte if we forced a short packet 417 418 if (skb->len) { 419 /* all data was already cloned from skb inside the driver */ 420 if (dev->driver_info->flags & FLAG_MULTI_PACKET) 421 dev_kfree_skb_any(skb); 422 else 423 usbnet_skb_return(dev, skb); 424 return; 425 } 426 427 netif_dbg(dev, rx_err, dev->net, "drop\n"); 428 dev->net->stats.rx_errors++; 429done: 430 skb_queue_tail(&dev->done, skb); 431} 432 433/*-------------------------------------------------------------------------*/ 434 435static void rx_complete (struct urb *urb) 436{ 437 struct sk_buff *skb = (struct sk_buff *) urb->context; 438 struct skb_data *entry = (struct skb_data *) skb->cb; 439 struct usbnet *dev = entry->dev; 440 int urb_status = urb->status; 441 enum skb_state state; 442 443 skb_put (skb, urb->actual_length); 444 state = rx_done; 445 entry->urb = NULL; 446 447 switch (urb_status) { 448 /* success */ 449 case 0: 450 if (skb->len < dev->net->hard_header_len) { 451 state = rx_cleanup; 452 dev->net->stats.rx_errors++; 453 dev->net->stats.rx_length_errors++; 454 netif_dbg(dev, rx_err, dev->net, 455 "rx length %d\n", skb->len); 456 } 457 break; 458 459 /* stalls need manual reset. this is rare ... except that 460 * when going through USB 2.0 TTs, unplug appears this way. 461 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ 462 * storm, recovering as needed. 463 */ 464 case -EPIPE: 465 dev->net->stats.rx_errors++; 466 usbnet_defer_kevent (dev, EVENT_RX_HALT); 467 // FALLTHROUGH 468 469 /* software-driven interface shutdown */ 470 case -ECONNRESET: /* async unlink */ 471 case -ESHUTDOWN: /* hardware gone */ 472 netif_dbg(dev, ifdown, dev->net, 473 "rx shutdown, code %d\n", urb_status); 474 goto block; 475 476 /* we get controller i/o faults during khubd disconnect() delays. 477 * throttle down resubmits, to avoid log floods; just temporarily, 478 * so we still recover when the fault isn't a khubd delay. 479 */ 480 case -EPROTO: 481 case -ETIME: 482 case -EILSEQ: 483 dev->net->stats.rx_errors++; 484 if (!timer_pending (&dev->delay)) { 485 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); 486 netif_dbg(dev, link, dev->net, 487 "rx throttle %d\n", urb_status); 488 } 489block: 490 state = rx_cleanup; 491 entry->urb = urb; 492 urb = NULL; 493 break; 494 495 /* data overrun ... flush fifo? */ 496 case -EOVERFLOW: 497 dev->net->stats.rx_over_errors++; 498 // FALLTHROUGH 499 500 default: 501 state = rx_cleanup; 502 dev->net->stats.rx_errors++; 503 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status); 504 break; 505 } 506 507 state = defer_bh(dev, skb, &dev->rxq, state); 508 509 if (urb) { 510 if (netif_running (dev->net) && 511 !test_bit (EVENT_RX_HALT, &dev->flags) && 512 state != unlink_start) { 513 rx_submit (dev, urb, GFP_ATOMIC); 514 usb_mark_last_busy(dev->udev); 515 return; 516 } 517 usb_free_urb (urb); 518 } 519 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n"); 520} 521 522static void intr_complete (struct urb *urb) 523{ 524 struct usbnet *dev = urb->context; 525 int status = urb->status; 526 527 switch (status) { 528 /* success */ 529 case 0: 530 dev->driver_info->status(dev, urb); 531 break; 532 533 /* software-driven interface shutdown */ 534 case -ENOENT: /* urb killed */ 535 case -ESHUTDOWN: /* hardware gone */ 536 netif_dbg(dev, ifdown, dev->net, 537 "intr shutdown, code %d\n", status); 538 return; 539 540 /* NOTE: not throttling like RX/TX, since this endpoint 541 * already polls infrequently 542 */ 543 default: 544 netdev_dbg(dev->net, "intr status %d\n", status); 545 break; 546 } 547 548 if (!netif_running (dev->net)) 549 return; 550 551 memset(urb->transfer_buffer, 0, urb->transfer_buffer_length); 552 status = usb_submit_urb (urb, GFP_ATOMIC); 553 if (status != 0) 554 netif_err(dev, timer, dev->net, 555 "intr resubmit --> %d\n", status); 556} 557 558/*-------------------------------------------------------------------------*/ 559void usbnet_pause_rx(struct usbnet *dev) 560{ 561 set_bit(EVENT_RX_PAUSED, &dev->flags); 562 563 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n"); 564} 565EXPORT_SYMBOL_GPL(usbnet_pause_rx); 566 567void usbnet_resume_rx(struct usbnet *dev) 568{ 569 struct sk_buff *skb; 570 int num = 0; 571 572 clear_bit(EVENT_RX_PAUSED, &dev->flags); 573 574 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) { 575 usbnet_skb_return(dev, skb); 576 num++; 577 } 578 579 tasklet_schedule(&dev->bh); 580 581 netif_dbg(dev, rx_status, dev->net, 582 "paused rx queue disabled, %d skbs requeued\n", num); 583} 584EXPORT_SYMBOL_GPL(usbnet_resume_rx); 585 586void usbnet_purge_paused_rxq(struct usbnet *dev) 587{ 588 skb_queue_purge(&dev->rxq_pause); 589} 590EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq); 591 592/*-------------------------------------------------------------------------*/ 593 594// unlink pending rx/tx; completion handlers do all other cleanup 595 596static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) 597{ 598 unsigned long flags; 599 struct sk_buff *skb; 600 int count = 0; 601 602 spin_lock_irqsave (&q->lock, flags); 603 while (!skb_queue_empty(q)) { 604 struct skb_data *entry; 605 struct urb *urb; 606 int retval; 607 608 skb_queue_walk(q, skb) { 609 entry = (struct skb_data *) skb->cb; 610 if (entry->state != unlink_start) 611 goto found; 612 } 613 break; 614found: 615 entry->state = unlink_start; 616 urb = entry->urb; 617 618 /* 619 * Get reference count of the URB to avoid it to be 620 * freed during usb_unlink_urb, which may trigger 621 * use-after-free problem inside usb_unlink_urb since 622 * usb_unlink_urb is always racing with .complete 623 * handler(include defer_bh). 624 */ 625 usb_get_urb(urb); 626 spin_unlock_irqrestore(&q->lock, flags); 627 // during some PM-driven resume scenarios, 628 // these (async) unlinks complete immediately 629 retval = usb_unlink_urb (urb); 630 if (retval != -EINPROGRESS && retval != 0) 631 netdev_dbg(dev->net, "unlink urb err, %d\n", retval); 632 else 633 count++; 634 usb_put_urb(urb); 635 spin_lock_irqsave(&q->lock, flags); 636 } 637 spin_unlock_irqrestore (&q->lock, flags); 638 return count; 639} 640 641// Flush all pending rx urbs 642// minidrivers may need to do this when the MTU changes 643 644void usbnet_unlink_rx_urbs(struct usbnet *dev) 645{ 646 if (netif_running(dev->net)) { 647 (void) unlink_urbs (dev, &dev->rxq); 648 tasklet_schedule(&dev->bh); 649 } 650} 651EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); 652 653/*-------------------------------------------------------------------------*/ 654 655// precondition: never called in_interrupt 656static void usbnet_terminate_urbs(struct usbnet *dev) 657{ 658 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup); 659 DECLARE_WAITQUEUE(wait, current); 660 int temp; 661 662 /* ensure there are no more active urbs */ 663 add_wait_queue(&unlink_wakeup, &wait); 664 set_current_state(TASK_UNINTERRUPTIBLE); 665 dev->wait = &unlink_wakeup; 666 temp = unlink_urbs(dev, &dev->txq) + 667 unlink_urbs(dev, &dev->rxq); 668 669 /* maybe wait for deletions to finish. */ 670 while (!skb_queue_empty(&dev->rxq) 671 && !skb_queue_empty(&dev->txq) 672 && !skb_queue_empty(&dev->done)) { 673 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS)); 674 set_current_state(TASK_UNINTERRUPTIBLE); 675 netif_dbg(dev, ifdown, dev->net, 676 "waited for %d urb completions\n", temp); 677 } 678 set_current_state(TASK_RUNNING); 679 dev->wait = NULL; 680 remove_wait_queue(&unlink_wakeup, &wait); 681} 682 683int usbnet_stop (struct net_device *net) 684{ 685 struct usbnet *dev = netdev_priv(net); 686 struct driver_info *info = dev->driver_info; 687 int retval; 688 689 clear_bit(EVENT_DEV_OPEN, &dev->flags); 690 netif_stop_queue (net); 691 692 netif_info(dev, ifdown, dev->net, 693 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n", 694 net->stats.rx_packets, net->stats.tx_packets, 695 net->stats.rx_errors, net->stats.tx_errors); 696 697 /* allow minidriver to stop correctly (wireless devices to turn off 698 * radio etc) */ 699 if (info->stop) { 700 retval = info->stop(dev); 701 if (retval < 0) 702 netif_info(dev, ifdown, dev->net, 703 "stop fail (%d) usbnet usb-%s-%s, %s\n", 704 retval, 705 dev->udev->bus->bus_name, dev->udev->devpath, 706 info->description); 707 } 708 709 if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) 710 usbnet_terminate_urbs(dev); 711 712 usb_kill_urb(dev->interrupt); 713 714 usbnet_purge_paused_rxq(dev); 715 716 /* deferred work (task, timer, softirq) must also stop. 717 * can't flush_scheduled_work() until we drop rtnl (later), 718 * else workers could deadlock; so make workers a NOP. 719 */ 720 dev->flags = 0; 721 del_timer_sync (&dev->delay); 722 tasklet_kill (&dev->bh); 723 if (info->manage_power) 724 info->manage_power(dev, 0); 725 else 726 usb_autopm_put_interface(dev->intf); 727 728 return 0; 729} 730EXPORT_SYMBOL_GPL(usbnet_stop); 731 732/*-------------------------------------------------------------------------*/ 733 734// posts reads, and enables write queuing 735 736// precondition: never called in_interrupt 737 738int usbnet_open (struct net_device *net) 739{ 740 struct usbnet *dev = netdev_priv(net); 741 int retval; 742 struct driver_info *info = dev->driver_info; 743 744 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { 745 netif_info(dev, ifup, dev->net, 746 "resumption fail (%d) usbnet usb-%s-%s, %s\n", 747 retval, 748 dev->udev->bus->bus_name, 749 dev->udev->devpath, 750 info->description); 751 goto done_nopm; 752 } 753 754 // put into "known safe" state 755 if (info->reset && (retval = info->reset (dev)) < 0) { 756 netif_info(dev, ifup, dev->net, 757 "open reset fail (%d) usbnet usb-%s-%s, %s\n", 758 retval, 759 dev->udev->bus->bus_name, 760 dev->udev->devpath, 761 info->description); 762 goto done; 763 } 764 765 // insist peer be connected 766 if (info->check_connect && (retval = info->check_connect (dev)) < 0) { 767 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval); 768 goto done; 769 } 770 771 /* start any status interrupt transfer */ 772 if (dev->interrupt) { 773 retval = usb_submit_urb (dev->interrupt, GFP_KERNEL); 774 if (retval < 0) { 775 netif_err(dev, ifup, dev->net, 776 "intr submit %d\n", retval); 777 goto done; 778 } 779 } 780 781 set_bit(EVENT_DEV_OPEN, &dev->flags); 782 netif_start_queue (net); 783 netif_info(dev, ifup, dev->net, 784 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n", 785 (int)RX_QLEN(dev), (int)TX_QLEN(dev), 786 dev->net->mtu, 787 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" : 788 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" : 789 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" : 790 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" : 791 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" : 792 "simple"); 793 794 // delay posting reads until we're fully open 795 tasklet_schedule (&dev->bh); 796 if (info->manage_power) { 797 retval = info->manage_power(dev, 1); 798 if (retval < 0) 799 goto done; 800 usb_autopm_put_interface(dev->intf); 801 } 802 return retval; 803 804done: 805 usb_autopm_put_interface(dev->intf); 806done_nopm: 807 return retval; 808} 809EXPORT_SYMBOL_GPL(usbnet_open); 810 811/*-------------------------------------------------------------------------*/ 812 813/* ethtool methods; minidrivers may need to add some more, but 814 * they'll probably want to use this base set. 815 */ 816 817int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd) 818{ 819 struct usbnet *dev = netdev_priv(net); 820 821 if (!dev->mii.mdio_read) 822 return -EOPNOTSUPP; 823 824 return mii_ethtool_gset(&dev->mii, cmd); 825} 826EXPORT_SYMBOL_GPL(usbnet_get_settings); 827 828int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd) 829{ 830 struct usbnet *dev = netdev_priv(net); 831 int retval; 832 833 if (!dev->mii.mdio_write) 834 return -EOPNOTSUPP; 835 836 retval = mii_ethtool_sset(&dev->mii, cmd); 837 838 /* link speed/duplex might have changed */ 839 if (dev->driver_info->link_reset) 840 dev->driver_info->link_reset(dev); 841 842 return retval; 843 844} 845EXPORT_SYMBOL_GPL(usbnet_set_settings); 846 847u32 usbnet_get_link (struct net_device *net) 848{ 849 struct usbnet *dev = netdev_priv(net); 850 851 /* If a check_connect is defined, return its result */ 852 if (dev->driver_info->check_connect) 853 return dev->driver_info->check_connect (dev) == 0; 854 855 /* if the device has mii operations, use those */ 856 if (dev->mii.mdio_read) 857 return mii_link_ok(&dev->mii); 858 859 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ 860 return ethtool_op_get_link(net); 861} 862EXPORT_SYMBOL_GPL(usbnet_get_link); 863 864int usbnet_nway_reset(struct net_device *net) 865{ 866 struct usbnet *dev = netdev_priv(net); 867 868 if (!dev->mii.mdio_write) 869 return -EOPNOTSUPP; 870 871 return mii_nway_restart(&dev->mii); 872} 873EXPORT_SYMBOL_GPL(usbnet_nway_reset); 874 875void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) 876{ 877 struct usbnet *dev = netdev_priv(net); 878 879 strncpy (info->driver, dev->driver_name, sizeof info->driver); 880 strncpy (info->version, DRIVER_VERSION, sizeof info->version); 881 strncpy (info->fw_version, dev->driver_info->description, 882 sizeof info->fw_version); 883 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); 884} 885EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); 886 887u32 usbnet_get_msglevel (struct net_device *net) 888{ 889 struct usbnet *dev = netdev_priv(net); 890 891 return dev->msg_enable; 892} 893EXPORT_SYMBOL_GPL(usbnet_get_msglevel); 894 895void usbnet_set_msglevel (struct net_device *net, u32 level) 896{ 897 struct usbnet *dev = netdev_priv(net); 898 899 dev->msg_enable = level; 900} 901EXPORT_SYMBOL_GPL(usbnet_set_msglevel); 902 903/* drivers may override default ethtool_ops in their bind() routine */ 904static const struct ethtool_ops usbnet_ethtool_ops = { 905 .get_settings = usbnet_get_settings, 906 .set_settings = usbnet_set_settings, 907 .get_link = usbnet_get_link, 908 .nway_reset = usbnet_nway_reset, 909 .get_drvinfo = usbnet_get_drvinfo, 910 .get_msglevel = usbnet_get_msglevel, 911 .set_msglevel = usbnet_set_msglevel, 912}; 913 914/*-------------------------------------------------------------------------*/ 915 916/* work that cannot be done in interrupt context uses keventd. 917 * 918 * NOTE: with 2.5 we could do more of this using completion callbacks, 919 * especially now that control transfers can be queued. 920 */ 921static void 922kevent (struct work_struct *work) 923{ 924 struct usbnet *dev = 925 container_of(work, struct usbnet, kevent); 926 int status; 927 928 /* usb_clear_halt() needs a thread context */ 929 if (test_bit (EVENT_TX_HALT, &dev->flags)) { 930 unlink_urbs (dev, &dev->txq); 931 status = usb_autopm_get_interface(dev->intf); 932 if (status < 0) 933 goto fail_pipe; 934 status = usb_clear_halt (dev->udev, dev->out); 935 usb_autopm_put_interface(dev->intf); 936 if (status < 0 && 937 status != -EPIPE && 938 status != -ESHUTDOWN) { 939 if (netif_msg_tx_err (dev)) 940fail_pipe: 941 netdev_err(dev->net, "can't clear tx halt, status %d\n", 942 status); 943 } else { 944 clear_bit (EVENT_TX_HALT, &dev->flags); 945 if (status != -ESHUTDOWN) 946 netif_wake_queue (dev->net); 947 } 948 } 949 if (test_bit (EVENT_RX_HALT, &dev->flags)) { 950 unlink_urbs (dev, &dev->rxq); 951 status = usb_autopm_get_interface(dev->intf); 952 if (status < 0) 953 goto fail_halt; 954 status = usb_clear_halt (dev->udev, dev->in); 955 usb_autopm_put_interface(dev->intf); 956 if (status < 0 && 957 status != -EPIPE && 958 status != -ESHUTDOWN) { 959 if (netif_msg_rx_err (dev)) 960fail_halt: 961 netdev_err(dev->net, "can't clear rx halt, status %d\n", 962 status); 963 } else { 964 clear_bit (EVENT_RX_HALT, &dev->flags); 965 tasklet_schedule (&dev->bh); 966 } 967 } 968 969 /* tasklet could resubmit itself forever if memory is tight */ 970 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { 971 struct urb *urb = NULL; 972 int resched = 1; 973 974 if (netif_running (dev->net)) 975 urb = usb_alloc_urb (0, GFP_KERNEL); 976 else 977 clear_bit (EVENT_RX_MEMORY, &dev->flags); 978 if (urb != NULL) { 979 clear_bit (EVENT_RX_MEMORY, &dev->flags); 980 status = usb_autopm_get_interface(dev->intf); 981 if (status < 0) { 982 usb_free_urb(urb); 983 goto fail_lowmem; 984 } 985 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) 986 resched = 0; 987 usb_autopm_put_interface(dev->intf); 988fail_lowmem: 989 if (resched) 990 tasklet_schedule (&dev->bh); 991 } 992 } 993 994 if (test_bit (EVENT_LINK_RESET, &dev->flags)) { 995 struct driver_info *info = dev->driver_info; 996 int retval = 0; 997 998 clear_bit (EVENT_LINK_RESET, &dev->flags); 999 status = usb_autopm_get_interface(dev->intf); 1000 if (status < 0) 1001 goto skip_reset; 1002 if(info->link_reset && (retval = info->link_reset(dev)) < 0) { 1003 usb_autopm_put_interface(dev->intf); 1004skip_reset: 1005 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", 1006 retval, 1007 dev->udev->bus->bus_name, 1008 dev->udev->devpath, 1009 info->description); 1010 } else { 1011 usb_autopm_put_interface(dev->intf); 1012 } 1013 } 1014 1015 if (dev->flags) 1016 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); 1017} 1018 1019/*-------------------------------------------------------------------------*/ 1020 1021static void tx_complete (struct urb *urb) 1022{ 1023 struct sk_buff *skb = (struct sk_buff *) urb->context; 1024 struct skb_data *entry = (struct skb_data *) skb->cb; 1025 struct usbnet *dev = entry->dev; 1026 1027 if (urb->status == 0) { 1028 if (!(dev->driver_info->flags & FLAG_MULTI_PACKET)) 1029 dev->net->stats.tx_packets++; 1030 dev->net->stats.tx_bytes += entry->length; 1031 } else { 1032 dev->net->stats.tx_errors++; 1033 1034 switch (urb->status) { 1035 case -EPIPE: 1036 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1037 break; 1038 1039 /* software-driven interface shutdown */ 1040 case -ECONNRESET: // async unlink 1041 case -ESHUTDOWN: // hardware gone 1042 break; 1043 1044 // like rx, tx gets controller i/o faults during khubd delays 1045 // and so it uses the same throttling mechanism. 1046 case -EPROTO: 1047 case -ETIME: 1048 case -EILSEQ: 1049 usb_mark_last_busy(dev->udev); 1050 if (!timer_pending (&dev->delay)) { 1051 mod_timer (&dev->delay, 1052 jiffies + THROTTLE_JIFFIES); 1053 netif_dbg(dev, link, dev->net, 1054 "tx throttle %d\n", urb->status); 1055 } 1056 netif_stop_queue (dev->net); 1057 break; 1058 default: 1059 netif_dbg(dev, tx_err, dev->net, 1060 "tx err %d\n", entry->urb->status); 1061 break; 1062 } 1063 } 1064 1065 usb_autopm_put_interface_async(dev->intf); 1066 (void) defer_bh(dev, skb, &dev->txq, tx_done); 1067} 1068 1069/*-------------------------------------------------------------------------*/ 1070 1071void usbnet_tx_timeout (struct net_device *net) 1072{ 1073 struct usbnet *dev = netdev_priv(net); 1074 1075 unlink_urbs (dev, &dev->txq); 1076 tasklet_schedule (&dev->bh); 1077 1078 // FIXME: device recovery -- reset? 1079} 1080EXPORT_SYMBOL_GPL(usbnet_tx_timeout); 1081 1082/*-------------------------------------------------------------------------*/ 1083 1084netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, 1085 struct net_device *net) 1086{ 1087 struct usbnet *dev = netdev_priv(net); 1088 int length; 1089 struct urb *urb = NULL; 1090 struct skb_data *entry; 1091 struct driver_info *info = dev->driver_info; 1092 unsigned long flags; 1093 int retval; 1094 1095 if (skb) 1096 skb_tx_timestamp(skb); 1097 1098 // some devices want funky USB-level framing, for 1099 // win32 driver (usually) and/or hardware quirks 1100 if (info->tx_fixup) { 1101 skb = info->tx_fixup (dev, skb, GFP_ATOMIC); 1102 if (!skb) { 1103 if (netif_msg_tx_err(dev)) { 1104 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); 1105 goto drop; 1106 } else { 1107 /* cdc_ncm collected packet; waits for more */ 1108 goto not_drop; 1109 } 1110 } 1111 } 1112 length = skb->len; 1113 1114 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { 1115 netif_dbg(dev, tx_err, dev->net, "no urb\n"); 1116 goto drop; 1117 } 1118 1119 entry = (struct skb_data *) skb->cb; 1120 entry->urb = urb; 1121 entry->dev = dev; 1122 entry->length = length; 1123 1124 usb_fill_bulk_urb (urb, dev->udev, dev->out, 1125 skb->data, skb->len, tx_complete, skb); 1126 1127 /* don't assume the hardware handles USB_ZERO_PACKET 1128 * NOTE: strictly conforming cdc-ether devices should expect 1129 * the ZLP here, but ignore the one-byte packet. 1130 * NOTE2: CDC NCM specification is different from CDC ECM when 1131 * handling ZLP/short packets, so cdc_ncm driver will make short 1132 * packet itself if needed. 1133 */ 1134 if (length % dev->maxpacket == 0) { 1135 if (!(info->flags & FLAG_SEND_ZLP)) { 1136 if (!(info->flags & FLAG_MULTI_PACKET)) { 1137 urb->transfer_buffer_length++; 1138 if (skb_tailroom(skb)) { 1139 skb->data[skb->len] = 0; 1140 __skb_put(skb, 1); 1141 } 1142 } 1143 } else 1144 urb->transfer_flags |= URB_ZERO_PACKET; 1145 } 1146 1147 spin_lock_irqsave(&dev->txq.lock, flags); 1148 retval = usb_autopm_get_interface_async(dev->intf); 1149 if (retval < 0) { 1150 spin_unlock_irqrestore(&dev->txq.lock, flags); 1151 goto drop; 1152 } 1153 1154#ifdef CONFIG_PM 1155 /* if this triggers the device is still a sleep */ 1156 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { 1157 /* transmission will be done in resume */ 1158 usb_anchor_urb(urb, &dev->deferred); 1159 /* no use to process more packets */ 1160 netif_stop_queue(net); 1161 spin_unlock_irqrestore(&dev->txq.lock, flags); 1162 netdev_dbg(dev->net, "Delaying transmission for resumption\n"); 1163 goto deferred; 1164 } 1165#endif 1166 1167 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { 1168 case -EPIPE: 1169 netif_stop_queue (net); 1170 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1171 usb_autopm_put_interface_async(dev->intf); 1172 break; 1173 default: 1174 usb_autopm_put_interface_async(dev->intf); 1175 netif_dbg(dev, tx_err, dev->net, 1176 "tx: submit urb err %d\n", retval); 1177 break; 1178 case 0: 1179 net->trans_start = jiffies; 1180 __usbnet_queue_skb(&dev->txq, skb, tx_start); 1181 if (dev->txq.qlen >= TX_QLEN (dev)) 1182 netif_stop_queue (net); 1183 } 1184 spin_unlock_irqrestore (&dev->txq.lock, flags); 1185 1186 if (retval) { 1187 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); 1188drop: 1189 dev->net->stats.tx_dropped++; 1190not_drop: 1191 if (skb) 1192 dev_kfree_skb_any (skb); 1193 usb_free_urb (urb); 1194 } else 1195 netif_dbg(dev, tx_queued, dev->net, 1196 "> tx, len %d, type 0x%x\n", length, skb->protocol); 1197#ifdef CONFIG_PM 1198deferred: 1199#endif 1200 return NETDEV_TX_OK; 1201} 1202EXPORT_SYMBOL_GPL(usbnet_start_xmit); 1203 1204/*-------------------------------------------------------------------------*/ 1205 1206// tasklet (work deferred from completions, in_irq) or timer 1207 1208static void usbnet_bh (unsigned long param) 1209{ 1210 struct usbnet *dev = (struct usbnet *) param; 1211 struct sk_buff *skb; 1212 struct skb_data *entry; 1213 1214 while ((skb = skb_dequeue (&dev->done))) { 1215 entry = (struct skb_data *) skb->cb; 1216 switch (entry->state) { 1217 case rx_done: 1218 entry->state = rx_cleanup; 1219 rx_process (dev, skb); 1220 continue; 1221 case tx_done: 1222 case rx_cleanup: 1223 usb_free_urb (entry->urb); 1224 dev_kfree_skb (skb); 1225 continue; 1226 default: 1227 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); 1228 } 1229 } 1230 1231 // waiting for all pending urbs to complete? 1232 if (dev->wait) { 1233 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) { 1234 wake_up (dev->wait); 1235 } 1236 1237 // or are we maybe short a few urbs? 1238 } else if (netif_running (dev->net) && 1239 netif_device_present (dev->net) && 1240 !timer_pending (&dev->delay) && 1241 !test_bit (EVENT_RX_HALT, &dev->flags)) { 1242 int temp = dev->rxq.qlen; 1243 int qlen = RX_QLEN (dev); 1244 1245 if (temp < qlen) { 1246 struct urb *urb; 1247 int i; 1248 1249 // don't refill the queue all at once 1250 for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) { 1251 urb = usb_alloc_urb (0, GFP_ATOMIC); 1252 if (urb != NULL) { 1253 if (rx_submit (dev, urb, GFP_ATOMIC) == 1254 -ENOLINK) 1255 return; 1256 } 1257 } 1258 if (temp != dev->rxq.qlen) 1259 netif_dbg(dev, link, dev->net, 1260 "rxqlen %d --> %d\n", 1261 temp, dev->rxq.qlen); 1262 if (dev->rxq.qlen < qlen) 1263 tasklet_schedule (&dev->bh); 1264 } 1265 if (dev->txq.qlen < TX_QLEN (dev)) 1266 netif_wake_queue (dev->net); 1267 } 1268} 1269 1270 1271/*------------------------------------------------------------------------- 1272 * 1273 * USB Device Driver support 1274 * 1275 *-------------------------------------------------------------------------*/ 1276 1277// precondition: never called in_interrupt 1278 1279void usbnet_disconnect (struct usb_interface *intf) 1280{ 1281 struct usbnet *dev; 1282 struct usb_device *xdev; 1283 struct net_device *net; 1284 1285 dev = usb_get_intfdata(intf); 1286 usb_set_intfdata(intf, NULL); 1287 if (!dev) 1288 return; 1289 1290 xdev = interface_to_usbdev (intf); 1291 1292 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", 1293 intf->dev.driver->name, 1294 xdev->bus->bus_name, xdev->devpath, 1295 dev->driver_info->description); 1296 1297 net = dev->net; 1298 unregister_netdev (net); 1299 1300 cancel_work_sync(&dev->kevent); 1301 1302 if (dev->driver_info->unbind) 1303 dev->driver_info->unbind (dev, intf); 1304 1305 usb_kill_urb(dev->interrupt); 1306 usb_free_urb(dev->interrupt); 1307 1308 free_netdev(net); 1309 usb_put_dev (xdev); 1310} 1311EXPORT_SYMBOL_GPL(usbnet_disconnect); 1312 1313static const struct net_device_ops usbnet_netdev_ops = { 1314 .ndo_open = usbnet_open, 1315 .ndo_stop = usbnet_stop, 1316 .ndo_start_xmit = usbnet_start_xmit, 1317 .ndo_tx_timeout = usbnet_tx_timeout, 1318 .ndo_change_mtu = usbnet_change_mtu, 1319 .ndo_set_mac_address = eth_mac_addr, 1320 .ndo_validate_addr = eth_validate_addr, 1321}; 1322 1323/*-------------------------------------------------------------------------*/ 1324 1325// precondition: never called in_interrupt 1326 1327static struct device_type wlan_type = { 1328 .name = "wlan", 1329}; 1330 1331static struct device_type wwan_type = { 1332 .name = "wwan", 1333}; 1334 1335int 1336usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) 1337{ 1338 struct usbnet *dev; 1339 struct net_device *net; 1340 struct usb_host_interface *interface; 1341 struct driver_info *info; 1342 struct usb_device *xdev; 1343 int status; 1344 const char *name; 1345 struct usb_driver *driver = to_usb_driver(udev->dev.driver); 1346 1347 /* usbnet already took usb runtime pm, so have to enable the feature 1348 * for usb interface, otherwise usb_autopm_get_interface may return 1349 * failure if USB_SUSPEND(RUNTIME_PM) is enabled. 1350 */ 1351 if (!driver->supports_autosuspend) { 1352 driver->supports_autosuspend = 1; 1353 pm_runtime_enable(&udev->dev); 1354 } 1355 1356 name = udev->dev.driver->name; 1357 info = (struct driver_info *) prod->driver_info; 1358 if (!info) { 1359 dev_dbg (&udev->dev, "blacklisted by %s\n", name); 1360 return -ENODEV; 1361 } 1362 xdev = interface_to_usbdev (udev); 1363 interface = udev->cur_altsetting; 1364 1365 usb_get_dev (xdev); 1366 1367 status = -ENOMEM; 1368 1369 // set up our own records 1370 net = alloc_etherdev(sizeof(*dev)); 1371 if (!net) 1372 goto out; 1373 1374 /* netdev_printk() needs this so do it as early as possible */ 1375 SET_NETDEV_DEV(net, &udev->dev); 1376 1377 dev = netdev_priv(net); 1378 dev->udev = xdev; 1379 dev->intf = udev; 1380 dev->driver_info = info; 1381 dev->driver_name = name; 1382 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV 1383 | NETIF_MSG_PROBE | NETIF_MSG_LINK); 1384 skb_queue_head_init (&dev->rxq); 1385 skb_queue_head_init (&dev->txq); 1386 skb_queue_head_init (&dev->done); 1387 skb_queue_head_init(&dev->rxq_pause); 1388 dev->bh.func = usbnet_bh; 1389 dev->bh.data = (unsigned long) dev; 1390 INIT_WORK (&dev->kevent, kevent); 1391 init_usb_anchor(&dev->deferred); 1392 dev->delay.function = usbnet_bh; 1393 dev->delay.data = (unsigned long) dev; 1394 init_timer (&dev->delay); 1395 mutex_init (&dev->phy_mutex); 1396 1397 dev->net = net; 1398 strcpy (net->name, "usb%d"); 1399 memcpy (net->dev_addr, node_id, sizeof node_id); 1400 1401 /* rx and tx sides can use different message sizes; 1402 * bind() should set rx_urb_size in that case. 1403 */ 1404 dev->hard_mtu = net->mtu + net->hard_header_len; 1405#if 0 1406// dma_supported() is deeply broken on almost all architectures 1407 // possible with some EHCI controllers 1408 if (dma_supported (&udev->dev, DMA_BIT_MASK(64))) 1409 net->features |= NETIF_F_HIGHDMA; 1410#endif 1411 1412 net->netdev_ops = &usbnet_netdev_ops; 1413 net->watchdog_timeo = TX_TIMEOUT_JIFFIES; 1414 net->ethtool_ops = &usbnet_ethtool_ops; 1415 1416 // allow device-specific bind/init procedures 1417 // NOTE net->name still not usable ... 1418 if (info->bind) { 1419 status = info->bind (dev, udev); 1420 if (status < 0) 1421 goto out1; 1422 1423 // heuristic: "usb%d" for links we know are two-host, 1424 // else "eth%d" when there's reasonable doubt. userspace 1425 // can rename the link if it knows better. 1426 if ((dev->driver_info->flags & FLAG_ETHER) != 0 && 1427 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 || 1428 (net->dev_addr [0] & 0x02) == 0)) 1429 strcpy (net->name, "eth%d"); 1430 /* WLAN devices should always be named "wlan%d" */ 1431 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1432 strcpy(net->name, "wlan%d"); 1433 /* WWAN devices should always be named "wwan%d" */ 1434 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1435 strcpy(net->name, "wwan%d"); 1436 1437 /* maybe the remote can't receive an Ethernet MTU */ 1438 if (net->mtu > (dev->hard_mtu - net->hard_header_len)) 1439 net->mtu = dev->hard_mtu - net->hard_header_len; 1440 } else if (!info->in || !info->out) 1441 status = usbnet_get_endpoints (dev, udev); 1442 else { 1443 dev->in = usb_rcvbulkpipe (xdev, info->in); 1444 dev->out = usb_sndbulkpipe (xdev, info->out); 1445 if (!(info->flags & FLAG_NO_SETINT)) 1446 status = usb_set_interface (xdev, 1447 interface->desc.bInterfaceNumber, 1448 interface->desc.bAlternateSetting); 1449 else 1450 status = 0; 1451 1452 } 1453 if (status >= 0 && dev->status) 1454 status = init_status (dev, udev); 1455 if (status < 0) 1456 goto out3; 1457 1458 if (!dev->rx_urb_size) 1459 dev->rx_urb_size = dev->hard_mtu; 1460 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); 1461 1462 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1463 SET_NETDEV_DEVTYPE(net, &wlan_type); 1464 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1465 SET_NETDEV_DEVTYPE(net, &wwan_type); 1466 1467 status = register_netdev (net); 1468 if (status) 1469 goto out4; 1470 netif_info(dev, probe, dev->net, 1471 "register '%s' at usb-%s-%s, %s, %pM\n", 1472 udev->dev.driver->name, 1473 xdev->bus->bus_name, xdev->devpath, 1474 dev->driver_info->description, 1475 net->dev_addr); 1476 1477 // ok, it's ready to go. 1478 usb_set_intfdata (udev, dev); 1479 1480 netif_device_attach (net); 1481 1482 if (dev->driver_info->flags & FLAG_LINK_INTR) 1483 netif_carrier_off(net); 1484 1485 return 0; 1486 1487out4: 1488 usb_free_urb(dev->interrupt); 1489out3: 1490 if (info->unbind) 1491 info->unbind (dev, udev); 1492out1: 1493 free_netdev(net); 1494out: 1495 usb_put_dev(xdev); 1496 return status; 1497} 1498EXPORT_SYMBOL_GPL(usbnet_probe); 1499 1500/*-------------------------------------------------------------------------*/ 1501 1502/* 1503 * suspend the whole driver as soon as the first interface is suspended 1504 * resume only when the last interface is resumed 1505 */ 1506 1507int usbnet_suspend (struct usb_interface *intf, pm_message_t message) 1508{ 1509 struct usbnet *dev = usb_get_intfdata(intf); 1510 1511 if (!dev->suspend_count++) { 1512 spin_lock_irq(&dev->txq.lock); 1513 /* don't autosuspend while transmitting */ 1514 if (dev->txq.qlen && PMSG_IS_AUTO(message)) { 1515 spin_unlock_irq(&dev->txq.lock); 1516 return -EBUSY; 1517 } else { 1518 set_bit(EVENT_DEV_ASLEEP, &dev->flags); 1519 spin_unlock_irq(&dev->txq.lock); 1520 } 1521 /* 1522 * accelerate emptying of the rx and queues, to avoid 1523 * having everything error out. 1524 */ 1525 netif_device_detach (dev->net); 1526 usbnet_terminate_urbs(dev); 1527 usb_kill_urb(dev->interrupt); 1528 1529 /* 1530 * reattach so runtime management can use and 1531 * wake the device 1532 */ 1533 netif_device_attach (dev->net); 1534 } 1535 return 0; 1536} 1537EXPORT_SYMBOL_GPL(usbnet_suspend); 1538 1539int usbnet_resume (struct usb_interface *intf) 1540{ 1541 struct usbnet *dev = usb_get_intfdata(intf); 1542 struct sk_buff *skb; 1543 struct urb *res; 1544 int retval; 1545 1546 if (!--dev->suspend_count) { 1547 /* resume interrupt URBs */ 1548 if (dev->interrupt && test_bit(EVENT_DEV_OPEN, &dev->flags)) 1549 usb_submit_urb(dev->interrupt, GFP_NOIO); 1550 1551 spin_lock_irq(&dev->txq.lock); 1552 while ((res = usb_get_from_anchor(&dev->deferred))) { 1553 1554 skb = (struct sk_buff *)res->context; 1555 retval = usb_submit_urb(res, GFP_ATOMIC); 1556 if (retval < 0) { 1557 dev_kfree_skb_any(skb); 1558 usb_free_urb(res); 1559 usb_autopm_put_interface_async(dev->intf); 1560 } else { 1561 dev->net->trans_start = jiffies; 1562 __skb_queue_tail(&dev->txq, skb); 1563 } 1564 } 1565 1566 smp_mb(); 1567 clear_bit(EVENT_DEV_ASLEEP, &dev->flags); 1568 spin_unlock_irq(&dev->txq.lock); 1569 1570 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) { 1571 if (!(dev->txq.qlen >= TX_QLEN(dev))) 1572 netif_tx_wake_all_queues(dev->net); 1573 tasklet_schedule (&dev->bh); 1574 } 1575 } 1576 return 0; 1577} 1578EXPORT_SYMBOL_GPL(usbnet_resume); 1579 1580 1581/*-------------------------------------------------------------------------*/ 1582 1583static int __init usbnet_init(void) 1584{ 1585 /* Compiler should optimize this out. */ 1586 BUILD_BUG_ON( 1587 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data)); 1588 1589 random_ether_addr(node_id); 1590 return 0; 1591} 1592module_init(usbnet_init); 1593 1594static void __exit usbnet_exit(void) 1595{ 1596} 1597module_exit(usbnet_exit); 1598 1599MODULE_AUTHOR("David Brownell"); 1600MODULE_DESCRIPTION("USB network driver framework"); 1601MODULE_LICENSE("GPL"); 1602