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 altsetttings. 113 */ 114 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) { 115 struct usb_host_endpoint *e; 116 int intr = 0; 117 118 e = alt->endpoint + ep; 119 switch (e->desc.bmAttributes) { 120 case USB_ENDPOINT_XFER_INT: 121 if (!usb_endpoint_dir_in(&e->desc)) 122 continue; 123 intr = 1; 124 /* FALLTHROUGH */ 125 case USB_ENDPOINT_XFER_BULK: 126 break; 127 default: 128 continue; 129 } 130 if (usb_endpoint_dir_in(&e->desc)) { 131 if (!intr && !in) 132 in = e; 133 else if (intr && !status) 134 status = e; 135 } else { 136 if (!out) 137 out = e; 138 } 139 } 140 if (in && out) 141 break; 142 } 143 if (!alt || !in || !out) 144 return -EINVAL; 145 146 if (alt->desc.bAlternateSetting != 0 || 147 !(dev->driver_info->flags & FLAG_NO_SETINT)) { 148 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber, 149 alt->desc.bAlternateSetting); 150 if (tmp < 0) 151 return tmp; 152 } 153 154 dev->in = usb_rcvbulkpipe (dev->udev, 155 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 156 dev->out = usb_sndbulkpipe (dev->udev, 157 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 158 dev->status = status; 159 return 0; 160 } 161 EXPORT_SYMBOL_GPL(usbnet_get_endpoints); 162 163 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress) 164 { 165 int tmp, i; 166 unsigned char buf [13]; 167 168 tmp = usb_string(dev->udev, iMACAddress, buf, sizeof buf); 169 if (tmp != 12) { 170 dev_dbg(&dev->udev->dev, 171 "bad MAC string %d fetch, %d\n", iMACAddress, tmp); 172 if (tmp >= 0) 173 tmp = -EINVAL; 174 return tmp; 175 } 176 for (i = tmp = 0; i < 6; i++, tmp += 2) 177 dev->net->dev_addr [i] = 178 (hex_to_bin(buf[tmp]) << 4) + hex_to_bin(buf[tmp + 1]); 179 return 0; 180 } 181 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr); 182 183 static void intr_complete (struct urb *urb); 184 185 static int init_status (struct usbnet *dev, struct usb_interface *intf) 186 { 187 char *buf = NULL; 188 unsigned pipe = 0; 189 unsigned maxp; 190 unsigned period; 191 192 if (!dev->driver_info->status) 193 return 0; 194 195 pipe = usb_rcvintpipe (dev->udev, 196 dev->status->desc.bEndpointAddress 197 & USB_ENDPOINT_NUMBER_MASK); 198 maxp = usb_maxpacket (dev->udev, pipe, 0); 199 200 /* avoid 1 msec chatter: min 8 msec poll rate */ 201 period = max ((int) dev->status->desc.bInterval, 202 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3); 203 204 buf = kmalloc (maxp, GFP_KERNEL); 205 if (buf) { 206 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL); 207 if (!dev->interrupt) { 208 kfree (buf); 209 return -ENOMEM; 210 } else { 211 usb_fill_int_urb(dev->interrupt, dev->udev, pipe, 212 buf, maxp, intr_complete, dev, period); 213 dev_dbg(&intf->dev, 214 "status ep%din, %d bytes period %d\n", 215 usb_pipeendpoint(pipe), maxp, period); 216 } 217 } 218 return 0; 219 } 220 221 /* Passes this packet up the stack, updating its accounting. 222 * Some link protocols batch packets, so their rx_fixup paths 223 * can return clones as well as just modify the original skb. 224 */ 225 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb) 226 { 227 int status; 228 229 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) { 230 skb_queue_tail(&dev->rxq_pause, skb); 231 return; 232 } 233 234 skb->protocol = eth_type_trans (skb, dev->net); 235 dev->net->stats.rx_packets++; 236 dev->net->stats.rx_bytes += skb->len; 237 238 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n", 239 skb->len + sizeof (struct ethhdr), skb->protocol); 240 memset (skb->cb, 0, sizeof (struct skb_data)); 241 status = netif_rx (skb); 242 if (status != NET_RX_SUCCESS) 243 netif_dbg(dev, rx_err, dev->net, 244 "netif_rx status %d\n", status); 245 } 246 EXPORT_SYMBOL_GPL(usbnet_skb_return); 247 248 249 /*------------------------------------------------------------------------- 250 * 251 * Network Device Driver (peer link to "Host Device", from USB host) 252 * 253 *-------------------------------------------------------------------------*/ 254 255 int usbnet_change_mtu (struct net_device *net, int new_mtu) 256 { 257 struct usbnet *dev = netdev_priv(net); 258 int ll_mtu = new_mtu + net->hard_header_len; 259 int old_hard_mtu = dev->hard_mtu; 260 int old_rx_urb_size = dev->rx_urb_size; 261 262 if (new_mtu <= 0) 263 return -EINVAL; 264 // no second zero-length packet read wanted after mtu-sized packets 265 if ((ll_mtu % dev->maxpacket) == 0) 266 return -EDOM; 267 net->mtu = new_mtu; 268 269 dev->hard_mtu = net->mtu + net->hard_header_len; 270 if (dev->rx_urb_size == old_hard_mtu) { 271 dev->rx_urb_size = dev->hard_mtu; 272 if (dev->rx_urb_size > old_rx_urb_size) 273 usbnet_unlink_rx_urbs(dev); 274 } 275 276 return 0; 277 } 278 EXPORT_SYMBOL_GPL(usbnet_change_mtu); 279 280 /*-------------------------------------------------------------------------*/ 281 282 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from 283 * completion callbacks. 2.5 should have fixed those bugs... 284 */ 285 286 static void defer_bh(struct usbnet *dev, struct sk_buff *skb, struct sk_buff_head *list) 287 { 288 unsigned long flags; 289 290 spin_lock_irqsave(&list->lock, flags); 291 __skb_unlink(skb, list); 292 spin_unlock(&list->lock); 293 spin_lock(&dev->done.lock); 294 __skb_queue_tail(&dev->done, skb); 295 if (dev->done.qlen == 1) 296 tasklet_schedule(&dev->bh); 297 spin_unlock_irqrestore(&dev->done.lock, flags); 298 } 299 300 /* some work can't be done in tasklets, so we use keventd 301 * 302 * NOTE: annoying asymmetry: if it's active, schedule_work() fails, 303 * but tasklet_schedule() doesn't. hope the failure is rare. 304 */ 305 void usbnet_defer_kevent (struct usbnet *dev, int work) 306 { 307 set_bit (work, &dev->flags); 308 if (!schedule_work (&dev->kevent)) 309 netdev_err(dev->net, "kevent %d may have been dropped\n", work); 310 else 311 netdev_dbg(dev->net, "kevent %d scheduled\n", work); 312 } 313 EXPORT_SYMBOL_GPL(usbnet_defer_kevent); 314 315 /*-------------------------------------------------------------------------*/ 316 317 static void rx_complete (struct urb *urb); 318 319 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) 320 { 321 struct sk_buff *skb; 322 struct skb_data *entry; 323 int retval = 0; 324 unsigned long lockflags; 325 size_t size = dev->rx_urb_size; 326 327 if ((skb = alloc_skb (size + NET_IP_ALIGN, flags)) == NULL) { 328 netif_dbg(dev, rx_err, dev->net, "no rx skb\n"); 329 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 330 usb_free_urb (urb); 331 return -ENOMEM; 332 } 333 skb_reserve (skb, NET_IP_ALIGN); 334 335 entry = (struct skb_data *) skb->cb; 336 entry->urb = urb; 337 entry->dev = dev; 338 entry->state = rx_start; 339 entry->length = 0; 340 341 usb_fill_bulk_urb (urb, dev->udev, dev->in, 342 skb->data, size, rx_complete, skb); 343 344 spin_lock_irqsave (&dev->rxq.lock, lockflags); 345 346 if (netif_running (dev->net) && 347 netif_device_present (dev->net) && 348 !test_bit (EVENT_RX_HALT, &dev->flags) && 349 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) { 350 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) { 351 case -EPIPE: 352 usbnet_defer_kevent (dev, EVENT_RX_HALT); 353 break; 354 case -ENOMEM: 355 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 356 break; 357 case -ENODEV: 358 netif_dbg(dev, ifdown, dev->net, "device gone\n"); 359 netif_device_detach (dev->net); 360 break; 361 case -EHOSTUNREACH: 362 retval = -ENOLINK; 363 break; 364 default: 365 netif_dbg(dev, rx_err, dev->net, 366 "rx submit, %d\n", retval); 367 tasklet_schedule (&dev->bh); 368 break; 369 case 0: 370 __skb_queue_tail (&dev->rxq, skb); 371 } 372 } else { 373 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n"); 374 retval = -ENOLINK; 375 } 376 spin_unlock_irqrestore (&dev->rxq.lock, lockflags); 377 if (retval) { 378 dev_kfree_skb_any (skb); 379 usb_free_urb (urb); 380 } 381 return retval; 382 } 383 384 385 /*-------------------------------------------------------------------------*/ 386 387 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb) 388 { 389 if (dev->driver_info->rx_fixup && 390 !dev->driver_info->rx_fixup (dev, skb)) { 391 /* With RX_ASSEMBLE, rx_fixup() must update counters */ 392 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE)) 393 dev->net->stats.rx_errors++; 394 goto done; 395 } 396 // else network stack removes extra byte if we forced a short packet 397 398 if (skb->len) { 399 /* all data was already cloned from skb inside the driver */ 400 if (dev->driver_info->flags & FLAG_MULTI_PACKET) 401 dev_kfree_skb_any(skb); 402 else 403 usbnet_skb_return(dev, skb); 404 return; 405 } 406 407 netif_dbg(dev, rx_err, dev->net, "drop\n"); 408 dev->net->stats.rx_errors++; 409 done: 410 skb_queue_tail(&dev->done, skb); 411 } 412 413 /*-------------------------------------------------------------------------*/ 414 415 static void rx_complete (struct urb *urb) 416 { 417 struct sk_buff *skb = (struct sk_buff *) urb->context; 418 struct skb_data *entry = (struct skb_data *) skb->cb; 419 struct usbnet *dev = entry->dev; 420 int urb_status = urb->status; 421 422 skb_put (skb, urb->actual_length); 423 entry->state = rx_done; 424 entry->urb = NULL; 425 426 switch (urb_status) { 427 /* success */ 428 case 0: 429 if (skb->len < dev->net->hard_header_len) { 430 entry->state = rx_cleanup; 431 dev->net->stats.rx_errors++; 432 dev->net->stats.rx_length_errors++; 433 netif_dbg(dev, rx_err, dev->net, 434 "rx length %d\n", skb->len); 435 } 436 break; 437 438 /* stalls need manual reset. this is rare ... except that 439 * when going through USB 2.0 TTs, unplug appears this way. 440 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ 441 * storm, recovering as needed. 442 */ 443 case -EPIPE: 444 dev->net->stats.rx_errors++; 445 usbnet_defer_kevent (dev, EVENT_RX_HALT); 446 // FALLTHROUGH 447 448 /* software-driven interface shutdown */ 449 case -ECONNRESET: /* async unlink */ 450 case -ESHUTDOWN: /* hardware gone */ 451 netif_dbg(dev, ifdown, dev->net, 452 "rx shutdown, code %d\n", urb_status); 453 goto block; 454 455 /* we get controller i/o faults during khubd disconnect() delays. 456 * throttle down resubmits, to avoid log floods; just temporarily, 457 * so we still recover when the fault isn't a khubd delay. 458 */ 459 case -EPROTO: 460 case -ETIME: 461 case -EILSEQ: 462 dev->net->stats.rx_errors++; 463 if (!timer_pending (&dev->delay)) { 464 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); 465 netif_dbg(dev, link, dev->net, 466 "rx throttle %d\n", urb_status); 467 } 468 block: 469 entry->state = rx_cleanup; 470 entry->urb = urb; 471 urb = NULL; 472 break; 473 474 /* data overrun ... flush fifo? */ 475 case -EOVERFLOW: 476 dev->net->stats.rx_over_errors++; 477 // FALLTHROUGH 478 479 default: 480 entry->state = rx_cleanup; 481 dev->net->stats.rx_errors++; 482 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status); 483 break; 484 } 485 486 defer_bh(dev, skb, &dev->rxq); 487 488 if (urb) { 489 if (netif_running (dev->net) && 490 !test_bit (EVENT_RX_HALT, &dev->flags)) { 491 rx_submit (dev, urb, GFP_ATOMIC); 492 return; 493 } 494 usb_free_urb (urb); 495 } 496 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n"); 497 } 498 499 static void intr_complete (struct urb *urb) 500 { 501 struct usbnet *dev = urb->context; 502 int status = urb->status; 503 504 switch (status) { 505 /* success */ 506 case 0: 507 dev->driver_info->status(dev, urb); 508 break; 509 510 /* software-driven interface shutdown */ 511 case -ENOENT: /* urb killed */ 512 case -ESHUTDOWN: /* hardware gone */ 513 netif_dbg(dev, ifdown, dev->net, 514 "intr shutdown, code %d\n", status); 515 return; 516 517 /* NOTE: not throttling like RX/TX, since this endpoint 518 * already polls infrequently 519 */ 520 default: 521 netdev_dbg(dev->net, "intr status %d\n", status); 522 break; 523 } 524 525 if (!netif_running (dev->net)) 526 return; 527 528 memset(urb->transfer_buffer, 0, urb->transfer_buffer_length); 529 status = usb_submit_urb (urb, GFP_ATOMIC); 530 if (status != 0) 531 netif_err(dev, timer, dev->net, 532 "intr resubmit --> %d\n", status); 533 } 534 535 /*-------------------------------------------------------------------------*/ 536 void usbnet_pause_rx(struct usbnet *dev) 537 { 538 set_bit(EVENT_RX_PAUSED, &dev->flags); 539 540 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n"); 541 } 542 EXPORT_SYMBOL_GPL(usbnet_pause_rx); 543 544 void usbnet_resume_rx(struct usbnet *dev) 545 { 546 struct sk_buff *skb; 547 int num = 0; 548 549 clear_bit(EVENT_RX_PAUSED, &dev->flags); 550 551 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) { 552 usbnet_skb_return(dev, skb); 553 num++; 554 } 555 556 tasklet_schedule(&dev->bh); 557 558 netif_dbg(dev, rx_status, dev->net, 559 "paused rx queue disabled, %d skbs requeued\n", num); 560 } 561 EXPORT_SYMBOL_GPL(usbnet_resume_rx); 562 563 void usbnet_purge_paused_rxq(struct usbnet *dev) 564 { 565 skb_queue_purge(&dev->rxq_pause); 566 } 567 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq); 568 569 /*-------------------------------------------------------------------------*/ 570 571 // unlink pending rx/tx; completion handlers do all other cleanup 572 573 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) 574 { 575 unsigned long flags; 576 struct sk_buff *skb, *skbnext; 577 int count = 0; 578 579 spin_lock_irqsave (&q->lock, flags); 580 skb_queue_walk_safe(q, skb, skbnext) { 581 struct skb_data *entry; 582 struct urb *urb; 583 int retval; 584 585 entry = (struct skb_data *) skb->cb; 586 urb = entry->urb; 587 588 // during some PM-driven resume scenarios, 589 // these (async) unlinks complete immediately 590 retval = usb_unlink_urb (urb); 591 if (retval != -EINPROGRESS && retval != 0) 592 netdev_dbg(dev->net, "unlink urb err, %d\n", retval); 593 else 594 count++; 595 } 596 spin_unlock_irqrestore (&q->lock, flags); 597 return count; 598 } 599 600 // Flush all pending rx urbs 601 // minidrivers may need to do this when the MTU changes 602 603 void usbnet_unlink_rx_urbs(struct usbnet *dev) 604 { 605 if (netif_running(dev->net)) { 606 (void) unlink_urbs (dev, &dev->rxq); 607 tasklet_schedule(&dev->bh); 608 } 609 } 610 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); 611 612 /*-------------------------------------------------------------------------*/ 613 614 // precondition: never called in_interrupt 615 static void usbnet_terminate_urbs(struct usbnet *dev) 616 { 617 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup); 618 DECLARE_WAITQUEUE(wait, current); 619 int temp; 620 621 /* ensure there are no more active urbs */ 622 add_wait_queue(&unlink_wakeup, &wait); 623 set_current_state(TASK_UNINTERRUPTIBLE); 624 dev->wait = &unlink_wakeup; 625 temp = unlink_urbs(dev, &dev->txq) + 626 unlink_urbs(dev, &dev->rxq); 627 628 /* maybe wait for deletions to finish. */ 629 while (!skb_queue_empty(&dev->rxq) 630 && !skb_queue_empty(&dev->txq) 631 && !skb_queue_empty(&dev->done)) { 632 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS)); 633 set_current_state(TASK_UNINTERRUPTIBLE); 634 netif_dbg(dev, ifdown, dev->net, 635 "waited for %d urb completions\n", temp); 636 } 637 set_current_state(TASK_RUNNING); 638 dev->wait = NULL; 639 remove_wait_queue(&unlink_wakeup, &wait); 640 } 641 642 int usbnet_stop (struct net_device *net) 643 { 644 struct usbnet *dev = netdev_priv(net); 645 struct driver_info *info = dev->driver_info; 646 int retval; 647 648 netif_stop_queue (net); 649 650 netif_info(dev, ifdown, dev->net, 651 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n", 652 net->stats.rx_packets, net->stats.tx_packets, 653 net->stats.rx_errors, net->stats.tx_errors); 654 655 /* allow minidriver to stop correctly (wireless devices to turn off 656 * radio etc) */ 657 if (info->stop) { 658 retval = info->stop(dev); 659 if (retval < 0) 660 netif_info(dev, ifdown, dev->net, 661 "stop fail (%d) usbnet usb-%s-%s, %s\n", 662 retval, 663 dev->udev->bus->bus_name, dev->udev->devpath, 664 info->description); 665 } 666 667 if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) 668 usbnet_terminate_urbs(dev); 669 670 usb_kill_urb(dev->interrupt); 671 672 usbnet_purge_paused_rxq(dev); 673 674 /* deferred work (task, timer, softirq) must also stop. 675 * can't flush_scheduled_work() until we drop rtnl (later), 676 * else workers could deadlock; so make workers a NOP. 677 */ 678 dev->flags = 0; 679 del_timer_sync (&dev->delay); 680 tasklet_kill (&dev->bh); 681 if (info->manage_power) 682 info->manage_power(dev, 0); 683 else 684 usb_autopm_put_interface(dev->intf); 685 686 return 0; 687 } 688 EXPORT_SYMBOL_GPL(usbnet_stop); 689 690 /*-------------------------------------------------------------------------*/ 691 692 // posts reads, and enables write queuing 693 694 // precondition: never called in_interrupt 695 696 int usbnet_open (struct net_device *net) 697 { 698 struct usbnet *dev = netdev_priv(net); 699 int retval; 700 struct driver_info *info = dev->driver_info; 701 702 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { 703 netif_info(dev, ifup, dev->net, 704 "resumption fail (%d) usbnet usb-%s-%s, %s\n", 705 retval, 706 dev->udev->bus->bus_name, 707 dev->udev->devpath, 708 info->description); 709 goto done_nopm; 710 } 711 712 // put into "known safe" state 713 if (info->reset && (retval = info->reset (dev)) < 0) { 714 netif_info(dev, ifup, dev->net, 715 "open reset fail (%d) usbnet usb-%s-%s, %s\n", 716 retval, 717 dev->udev->bus->bus_name, 718 dev->udev->devpath, 719 info->description); 720 goto done; 721 } 722 723 // insist peer be connected 724 if (info->check_connect && (retval = info->check_connect (dev)) < 0) { 725 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval); 726 goto done; 727 } 728 729 /* start any status interrupt transfer */ 730 if (dev->interrupt) { 731 retval = usb_submit_urb (dev->interrupt, GFP_KERNEL); 732 if (retval < 0) { 733 netif_err(dev, ifup, dev->net, 734 "intr submit %d\n", retval); 735 goto done; 736 } 737 } 738 739 set_bit(EVENT_DEV_OPEN, &dev->flags); 740 netif_start_queue (net); 741 netif_info(dev, ifup, dev->net, 742 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n", 743 (int)RX_QLEN(dev), (int)TX_QLEN(dev), 744 dev->net->mtu, 745 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" : 746 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" : 747 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" : 748 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" : 749 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" : 750 "simple"); 751 752 // delay posting reads until we're fully open 753 tasklet_schedule (&dev->bh); 754 if (info->manage_power) { 755 retval = info->manage_power(dev, 1); 756 if (retval < 0) 757 goto done; 758 usb_autopm_put_interface(dev->intf); 759 } 760 return retval; 761 762 done: 763 usb_autopm_put_interface(dev->intf); 764 done_nopm: 765 return retval; 766 } 767 EXPORT_SYMBOL_GPL(usbnet_open); 768 769 /*-------------------------------------------------------------------------*/ 770 771 /* ethtool methods; minidrivers may need to add some more, but 772 * they'll probably want to use this base set. 773 */ 774 775 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd) 776 { 777 struct usbnet *dev = netdev_priv(net); 778 779 if (!dev->mii.mdio_read) 780 return -EOPNOTSUPP; 781 782 return mii_ethtool_gset(&dev->mii, cmd); 783 } 784 EXPORT_SYMBOL_GPL(usbnet_get_settings); 785 786 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd) 787 { 788 struct usbnet *dev = netdev_priv(net); 789 int retval; 790 791 if (!dev->mii.mdio_write) 792 return -EOPNOTSUPP; 793 794 retval = mii_ethtool_sset(&dev->mii, cmd); 795 796 /* link speed/duplex might have changed */ 797 if (dev->driver_info->link_reset) 798 dev->driver_info->link_reset(dev); 799 800 return retval; 801 802 } 803 EXPORT_SYMBOL_GPL(usbnet_set_settings); 804 805 u32 usbnet_get_link (struct net_device *net) 806 { 807 struct usbnet *dev = netdev_priv(net); 808 809 /* If a check_connect is defined, return its result */ 810 if (dev->driver_info->check_connect) 811 return dev->driver_info->check_connect (dev) == 0; 812 813 /* if the device has mii operations, use those */ 814 if (dev->mii.mdio_read) 815 return mii_link_ok(&dev->mii); 816 817 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ 818 return ethtool_op_get_link(net); 819 } 820 EXPORT_SYMBOL_GPL(usbnet_get_link); 821 822 int usbnet_nway_reset(struct net_device *net) 823 { 824 struct usbnet *dev = netdev_priv(net); 825 826 if (!dev->mii.mdio_write) 827 return -EOPNOTSUPP; 828 829 return mii_nway_restart(&dev->mii); 830 } 831 EXPORT_SYMBOL_GPL(usbnet_nway_reset); 832 833 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) 834 { 835 struct usbnet *dev = netdev_priv(net); 836 837 strncpy (info->driver, dev->driver_name, sizeof info->driver); 838 strncpy (info->version, DRIVER_VERSION, sizeof info->version); 839 strncpy (info->fw_version, dev->driver_info->description, 840 sizeof info->fw_version); 841 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); 842 } 843 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); 844 845 u32 usbnet_get_msglevel (struct net_device *net) 846 { 847 struct usbnet *dev = netdev_priv(net); 848 849 return dev->msg_enable; 850 } 851 EXPORT_SYMBOL_GPL(usbnet_get_msglevel); 852 853 void usbnet_set_msglevel (struct net_device *net, u32 level) 854 { 855 struct usbnet *dev = netdev_priv(net); 856 857 dev->msg_enable = level; 858 } 859 EXPORT_SYMBOL_GPL(usbnet_set_msglevel); 860 861 /* drivers may override default ethtool_ops in their bind() routine */ 862 static const struct ethtool_ops usbnet_ethtool_ops = { 863 .get_settings = usbnet_get_settings, 864 .set_settings = usbnet_set_settings, 865 .get_link = usbnet_get_link, 866 .nway_reset = usbnet_nway_reset, 867 .get_drvinfo = usbnet_get_drvinfo, 868 .get_msglevel = usbnet_get_msglevel, 869 .set_msglevel = usbnet_set_msglevel, 870 }; 871 872 /*-------------------------------------------------------------------------*/ 873 874 /* work that cannot be done in interrupt context uses keventd. 875 * 876 * NOTE: with 2.5 we could do more of this using completion callbacks, 877 * especially now that control transfers can be queued. 878 */ 879 static void 880 kevent (struct work_struct *work) 881 { 882 struct usbnet *dev = 883 container_of(work, struct usbnet, kevent); 884 int status; 885 886 /* usb_clear_halt() needs a thread context */ 887 if (test_bit (EVENT_TX_HALT, &dev->flags)) { 888 unlink_urbs (dev, &dev->txq); 889 status = usb_autopm_get_interface(dev->intf); 890 if (status < 0) 891 goto fail_pipe; 892 status = usb_clear_halt (dev->udev, dev->out); 893 usb_autopm_put_interface(dev->intf); 894 if (status < 0 && 895 status != -EPIPE && 896 status != -ESHUTDOWN) { 897 if (netif_msg_tx_err (dev)) 898 fail_pipe: 899 netdev_err(dev->net, "can't clear tx halt, status %d\n", 900 status); 901 } else { 902 clear_bit (EVENT_TX_HALT, &dev->flags); 903 if (status != -ESHUTDOWN) 904 netif_wake_queue (dev->net); 905 } 906 } 907 if (test_bit (EVENT_RX_HALT, &dev->flags)) { 908 unlink_urbs (dev, &dev->rxq); 909 status = usb_autopm_get_interface(dev->intf); 910 if (status < 0) 911 goto fail_halt; 912 status = usb_clear_halt (dev->udev, dev->in); 913 usb_autopm_put_interface(dev->intf); 914 if (status < 0 && 915 status != -EPIPE && 916 status != -ESHUTDOWN) { 917 if (netif_msg_rx_err (dev)) 918 fail_halt: 919 netdev_err(dev->net, "can't clear rx halt, status %d\n", 920 status); 921 } else { 922 clear_bit (EVENT_RX_HALT, &dev->flags); 923 tasklet_schedule (&dev->bh); 924 } 925 } 926 927 /* tasklet could resubmit itself forever if memory is tight */ 928 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { 929 struct urb *urb = NULL; 930 int resched = 1; 931 932 if (netif_running (dev->net)) 933 urb = usb_alloc_urb (0, GFP_KERNEL); 934 else 935 clear_bit (EVENT_RX_MEMORY, &dev->flags); 936 if (urb != NULL) { 937 clear_bit (EVENT_RX_MEMORY, &dev->flags); 938 status = usb_autopm_get_interface(dev->intf); 939 if (status < 0) { 940 usb_free_urb(urb); 941 goto fail_lowmem; 942 } 943 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) 944 resched = 0; 945 usb_autopm_put_interface(dev->intf); 946 fail_lowmem: 947 if (resched) 948 tasklet_schedule (&dev->bh); 949 } 950 } 951 952 if (test_bit (EVENT_LINK_RESET, &dev->flags)) { 953 struct driver_info *info = dev->driver_info; 954 int retval = 0; 955 956 clear_bit (EVENT_LINK_RESET, &dev->flags); 957 status = usb_autopm_get_interface(dev->intf); 958 if (status < 0) 959 goto skip_reset; 960 if(info->link_reset && (retval = info->link_reset(dev)) < 0) { 961 usb_autopm_put_interface(dev->intf); 962 skip_reset: 963 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", 964 retval, 965 dev->udev->bus->bus_name, 966 dev->udev->devpath, 967 info->description); 968 } else { 969 usb_autopm_put_interface(dev->intf); 970 } 971 } 972 973 if (dev->flags) 974 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); 975 } 976 977 /*-------------------------------------------------------------------------*/ 978 979 static void tx_complete (struct urb *urb) 980 { 981 struct sk_buff *skb = (struct sk_buff *) urb->context; 982 struct skb_data *entry = (struct skb_data *) skb->cb; 983 struct usbnet *dev = entry->dev; 984 985 if (urb->status == 0) { 986 if (!(dev->driver_info->flags & FLAG_MULTI_PACKET)) 987 dev->net->stats.tx_packets++; 988 dev->net->stats.tx_bytes += entry->length; 989 } else { 990 dev->net->stats.tx_errors++; 991 992 switch (urb->status) { 993 case -EPIPE: 994 usbnet_defer_kevent (dev, EVENT_TX_HALT); 995 break; 996 997 /* software-driven interface shutdown */ 998 case -ECONNRESET: // async unlink 999 case -ESHUTDOWN: // hardware gone 1000 break; 1001 1002 // like rx, tx gets controller i/o faults during khubd delays 1003 // and so it uses the same throttling mechanism. 1004 case -EPROTO: 1005 case -ETIME: 1006 case -EILSEQ: 1007 usb_mark_last_busy(dev->udev); 1008 if (!timer_pending (&dev->delay)) { 1009 mod_timer (&dev->delay, 1010 jiffies + THROTTLE_JIFFIES); 1011 netif_dbg(dev, link, dev->net, 1012 "tx throttle %d\n", urb->status); 1013 } 1014 netif_stop_queue (dev->net); 1015 break; 1016 default: 1017 netif_dbg(dev, tx_err, dev->net, 1018 "tx err %d\n", entry->urb->status); 1019 break; 1020 } 1021 } 1022 1023 usb_autopm_put_interface_async(dev->intf); 1024 urb->dev = NULL; 1025 entry->state = tx_done; 1026 defer_bh(dev, skb, &dev->txq); 1027 } 1028 1029 /*-------------------------------------------------------------------------*/ 1030 1031 void usbnet_tx_timeout (struct net_device *net) 1032 { 1033 struct usbnet *dev = netdev_priv(net); 1034 1035 unlink_urbs (dev, &dev->txq); 1036 tasklet_schedule (&dev->bh); 1037 1038 // FIXME: device recovery -- reset? 1039 } 1040 EXPORT_SYMBOL_GPL(usbnet_tx_timeout); 1041 1042 /*-------------------------------------------------------------------------*/ 1043 1044 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, 1045 struct net_device *net) 1046 { 1047 struct usbnet *dev = netdev_priv(net); 1048 int length; 1049 struct urb *urb = NULL; 1050 struct skb_data *entry; 1051 struct driver_info *info = dev->driver_info; 1052 unsigned long flags; 1053 int retval; 1054 1055 // some devices want funky USB-level framing, for 1056 // win32 driver (usually) and/or hardware quirks 1057 if (info->tx_fixup) { 1058 skb = info->tx_fixup (dev, skb, GFP_ATOMIC); 1059 if (!skb) { 1060 if (netif_msg_tx_err(dev)) { 1061 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); 1062 goto drop; 1063 } else { 1064 /* cdc_ncm collected packet; waits for more */ 1065 goto not_drop; 1066 } 1067 } 1068 } 1069 length = skb->len; 1070 1071 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { 1072 netif_dbg(dev, tx_err, dev->net, "no urb\n"); 1073 goto drop; 1074 } 1075 1076 entry = (struct skb_data *) skb->cb; 1077 entry->urb = urb; 1078 entry->dev = dev; 1079 entry->state = tx_start; 1080 entry->length = length; 1081 1082 usb_fill_bulk_urb (urb, dev->udev, dev->out, 1083 skb->data, skb->len, tx_complete, skb); 1084 1085 /* don't assume the hardware handles USB_ZERO_PACKET 1086 * NOTE: strictly conforming cdc-ether devices should expect 1087 * the ZLP here, but ignore the one-byte packet. 1088 * NOTE2: CDC NCM specification is different from CDC ECM when 1089 * handling ZLP/short packets, so cdc_ncm driver will make short 1090 * packet itself if needed. 1091 */ 1092 if (length % dev->maxpacket == 0) { 1093 if (!(info->flags & FLAG_SEND_ZLP)) { 1094 if (!(info->flags & FLAG_MULTI_PACKET)) { 1095 urb->transfer_buffer_length++; 1096 if (skb_tailroom(skb)) { 1097 skb->data[skb->len] = 0; 1098 __skb_put(skb, 1); 1099 } 1100 } 1101 } else 1102 urb->transfer_flags |= URB_ZERO_PACKET; 1103 } 1104 1105 spin_lock_irqsave(&dev->txq.lock, flags); 1106 retval = usb_autopm_get_interface_async(dev->intf); 1107 if (retval < 0) { 1108 spin_unlock_irqrestore(&dev->txq.lock, flags); 1109 goto drop; 1110 } 1111 1112 #ifdef CONFIG_PM 1113 /* if this triggers the device is still a sleep */ 1114 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { 1115 /* transmission will be done in resume */ 1116 usb_anchor_urb(urb, &dev->deferred); 1117 /* no use to process more packets */ 1118 netif_stop_queue(net); 1119 spin_unlock_irqrestore(&dev->txq.lock, flags); 1120 netdev_dbg(dev->net, "Delaying transmission for resumption\n"); 1121 goto deferred; 1122 } 1123 #endif 1124 1125 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { 1126 case -EPIPE: 1127 netif_stop_queue (net); 1128 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1129 usb_autopm_put_interface_async(dev->intf); 1130 break; 1131 default: 1132 usb_autopm_put_interface_async(dev->intf); 1133 netif_dbg(dev, tx_err, dev->net, 1134 "tx: submit urb err %d\n", retval); 1135 break; 1136 case 0: 1137 net->trans_start = jiffies; 1138 __skb_queue_tail (&dev->txq, skb); 1139 if (dev->txq.qlen >= TX_QLEN (dev)) 1140 netif_stop_queue (net); 1141 } 1142 spin_unlock_irqrestore (&dev->txq.lock, flags); 1143 1144 if (retval) { 1145 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); 1146 drop: 1147 dev->net->stats.tx_dropped++; 1148 not_drop: 1149 if (skb) 1150 dev_kfree_skb_any (skb); 1151 usb_free_urb (urb); 1152 } else 1153 netif_dbg(dev, tx_queued, dev->net, 1154 "> tx, len %d, type 0x%x\n", length, skb->protocol); 1155 #ifdef CONFIG_PM 1156 deferred: 1157 #endif 1158 return NETDEV_TX_OK; 1159 } 1160 EXPORT_SYMBOL_GPL(usbnet_start_xmit); 1161 1162 /*-------------------------------------------------------------------------*/ 1163 1164 // tasklet (work deferred from completions, in_irq) or timer 1165 1166 static void usbnet_bh (unsigned long param) 1167 { 1168 struct usbnet *dev = (struct usbnet *) param; 1169 struct sk_buff *skb; 1170 struct skb_data *entry; 1171 1172 while ((skb = skb_dequeue (&dev->done))) { 1173 entry = (struct skb_data *) skb->cb; 1174 switch (entry->state) { 1175 case rx_done: 1176 entry->state = rx_cleanup; 1177 rx_process (dev, skb); 1178 continue; 1179 case tx_done: 1180 case rx_cleanup: 1181 usb_free_urb (entry->urb); 1182 dev_kfree_skb (skb); 1183 continue; 1184 default: 1185 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); 1186 } 1187 } 1188 1189 // waiting for all pending urbs to complete? 1190 if (dev->wait) { 1191 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) { 1192 wake_up (dev->wait); 1193 } 1194 1195 // or are we maybe short a few urbs? 1196 } else if (netif_running (dev->net) && 1197 netif_device_present (dev->net) && 1198 !timer_pending (&dev->delay) && 1199 !test_bit (EVENT_RX_HALT, &dev->flags)) { 1200 int temp = dev->rxq.qlen; 1201 int qlen = RX_QLEN (dev); 1202 1203 if (temp < qlen) { 1204 struct urb *urb; 1205 int i; 1206 1207 // don't refill the queue all at once 1208 for (i = 0; i < 10 && dev->rxq.qlen < qlen; i++) { 1209 urb = usb_alloc_urb (0, GFP_ATOMIC); 1210 if (urb != NULL) { 1211 if (rx_submit (dev, urb, GFP_ATOMIC) == 1212 -ENOLINK) 1213 return; 1214 } 1215 } 1216 if (temp != dev->rxq.qlen) 1217 netif_dbg(dev, link, dev->net, 1218 "rxqlen %d --> %d\n", 1219 temp, dev->rxq.qlen); 1220 if (dev->rxq.qlen < qlen) 1221 tasklet_schedule (&dev->bh); 1222 } 1223 if (dev->txq.qlen < TX_QLEN (dev)) 1224 netif_wake_queue (dev->net); 1225 } 1226 } 1227 1228 1229 /*------------------------------------------------------------------------- 1230 * 1231 * USB Device Driver support 1232 * 1233 *-------------------------------------------------------------------------*/ 1234 1235 // precondition: never called in_interrupt 1236 1237 void usbnet_disconnect (struct usb_interface *intf) 1238 { 1239 struct usbnet *dev; 1240 struct usb_device *xdev; 1241 struct net_device *net; 1242 1243 dev = usb_get_intfdata(intf); 1244 usb_set_intfdata(intf, NULL); 1245 if (!dev) 1246 return; 1247 1248 xdev = interface_to_usbdev (intf); 1249 1250 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", 1251 intf->dev.driver->name, 1252 xdev->bus->bus_name, xdev->devpath, 1253 dev->driver_info->description); 1254 1255 net = dev->net; 1256 unregister_netdev (net); 1257 1258 cancel_work_sync(&dev->kevent); 1259 1260 if (dev->driver_info->unbind) 1261 dev->driver_info->unbind (dev, intf); 1262 1263 usb_kill_urb(dev->interrupt); 1264 usb_free_urb(dev->interrupt); 1265 1266 free_netdev(net); 1267 usb_put_dev (xdev); 1268 } 1269 EXPORT_SYMBOL_GPL(usbnet_disconnect); 1270 1271 static const struct net_device_ops usbnet_netdev_ops = { 1272 .ndo_open = usbnet_open, 1273 .ndo_stop = usbnet_stop, 1274 .ndo_start_xmit = usbnet_start_xmit, 1275 .ndo_tx_timeout = usbnet_tx_timeout, 1276 .ndo_change_mtu = usbnet_change_mtu, 1277 .ndo_set_mac_address = eth_mac_addr, 1278 .ndo_validate_addr = eth_validate_addr, 1279 }; 1280 1281 /*-------------------------------------------------------------------------*/ 1282 1283 // precondition: never called in_interrupt 1284 1285 static struct device_type wlan_type = { 1286 .name = "wlan", 1287 }; 1288 1289 static struct device_type wwan_type = { 1290 .name = "wwan", 1291 }; 1292 1293 int 1294 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) 1295 { 1296 struct usbnet *dev; 1297 struct net_device *net; 1298 struct usb_host_interface *interface; 1299 struct driver_info *info; 1300 struct usb_device *xdev; 1301 int status; 1302 const char *name; 1303 struct usb_driver *driver = to_usb_driver(udev->dev.driver); 1304 1305 /* usbnet already took usb runtime pm, so have to enable the feature 1306 * for usb interface, otherwise usb_autopm_get_interface may return 1307 * failure if USB_SUSPEND(RUNTIME_PM) is enabled. 1308 */ 1309 if (!driver->supports_autosuspend) { 1310 driver->supports_autosuspend = 1; 1311 pm_runtime_enable(&udev->dev); 1312 } 1313 1314 name = udev->dev.driver->name; 1315 info = (struct driver_info *) prod->driver_info; 1316 if (!info) { 1317 dev_dbg (&udev->dev, "blacklisted by %s\n", name); 1318 return -ENODEV; 1319 } 1320 xdev = interface_to_usbdev (udev); 1321 interface = udev->cur_altsetting; 1322 1323 usb_get_dev (xdev); 1324 1325 status = -ENOMEM; 1326 1327 // set up our own records 1328 net = alloc_etherdev(sizeof(*dev)); 1329 if (!net) { 1330 dbg ("can't kmalloc dev"); 1331 goto out; 1332 } 1333 1334 /* netdev_printk() needs this so do it as early as possible */ 1335 SET_NETDEV_DEV(net, &udev->dev); 1336 1337 dev = netdev_priv(net); 1338 dev->udev = xdev; 1339 dev->intf = udev; 1340 dev->driver_info = info; 1341 dev->driver_name = name; 1342 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV 1343 | NETIF_MSG_PROBE | NETIF_MSG_LINK); 1344 skb_queue_head_init (&dev->rxq); 1345 skb_queue_head_init (&dev->txq); 1346 skb_queue_head_init (&dev->done); 1347 skb_queue_head_init(&dev->rxq_pause); 1348 dev->bh.func = usbnet_bh; 1349 dev->bh.data = (unsigned long) dev; 1350 INIT_WORK (&dev->kevent, kevent); 1351 init_usb_anchor(&dev->deferred); 1352 dev->delay.function = usbnet_bh; 1353 dev->delay.data = (unsigned long) dev; 1354 init_timer (&dev->delay); 1355 mutex_init (&dev->phy_mutex); 1356 1357 dev->net = net; 1358 strcpy (net->name, "usb%d"); 1359 memcpy (net->dev_addr, node_id, sizeof node_id); 1360 1361 /* rx and tx sides can use different message sizes; 1362 * bind() should set rx_urb_size in that case. 1363 */ 1364 dev->hard_mtu = net->mtu + net->hard_header_len; 1365 #if 0 1366 // dma_supported() is deeply broken on almost all architectures 1367 // possible with some EHCI controllers 1368 if (dma_supported (&udev->dev, DMA_BIT_MASK(64))) 1369 net->features |= NETIF_F_HIGHDMA; 1370 #endif 1371 1372 net->netdev_ops = &usbnet_netdev_ops; 1373 net->watchdog_timeo = TX_TIMEOUT_JIFFIES; 1374 net->ethtool_ops = &usbnet_ethtool_ops; 1375 1376 // allow device-specific bind/init procedures 1377 // NOTE net->name still not usable ... 1378 if (info->bind) { 1379 status = info->bind (dev, udev); 1380 if (status < 0) 1381 goto out1; 1382 1383 // heuristic: "usb%d" for links we know are two-host, 1384 // else "eth%d" when there's reasonable doubt. userspace 1385 // can rename the link if it knows better. 1386 if ((dev->driver_info->flags & FLAG_ETHER) != 0 && 1387 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 || 1388 (net->dev_addr [0] & 0x02) == 0)) 1389 strcpy (net->name, "eth%d"); 1390 /* WLAN devices should always be named "wlan%d" */ 1391 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1392 strcpy(net->name, "wlan%d"); 1393 /* WWAN devices should always be named "wwan%d" */ 1394 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1395 strcpy(net->name, "wwan%d"); 1396 1397 /* maybe the remote can't receive an Ethernet MTU */ 1398 if (net->mtu > (dev->hard_mtu - net->hard_header_len)) 1399 net->mtu = dev->hard_mtu - net->hard_header_len; 1400 } else if (!info->in || !info->out) 1401 status = usbnet_get_endpoints (dev, udev); 1402 else { 1403 dev->in = usb_rcvbulkpipe (xdev, info->in); 1404 dev->out = usb_sndbulkpipe (xdev, info->out); 1405 if (!(info->flags & FLAG_NO_SETINT)) 1406 status = usb_set_interface (xdev, 1407 interface->desc.bInterfaceNumber, 1408 interface->desc.bAlternateSetting); 1409 else 1410 status = 0; 1411 1412 } 1413 if (status >= 0 && dev->status) 1414 status = init_status (dev, udev); 1415 if (status < 0) 1416 goto out3; 1417 1418 if (!dev->rx_urb_size) 1419 dev->rx_urb_size = dev->hard_mtu; 1420 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); 1421 1422 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1423 SET_NETDEV_DEVTYPE(net, &wlan_type); 1424 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1425 SET_NETDEV_DEVTYPE(net, &wwan_type); 1426 1427 status = register_netdev (net); 1428 if (status) 1429 goto out3; 1430 netif_info(dev, probe, dev->net, 1431 "register '%s' at usb-%s-%s, %s, %pM\n", 1432 udev->dev.driver->name, 1433 xdev->bus->bus_name, xdev->devpath, 1434 dev->driver_info->description, 1435 net->dev_addr); 1436 1437 // ok, it's ready to go. 1438 usb_set_intfdata (udev, dev); 1439 1440 netif_device_attach (net); 1441 1442 if (dev->driver_info->flags & FLAG_LINK_INTR) 1443 netif_carrier_off(net); 1444 1445 return 0; 1446 1447 out3: 1448 if (info->unbind) 1449 info->unbind (dev, udev); 1450 out1: 1451 free_netdev(net); 1452 out: 1453 usb_put_dev(xdev); 1454 return status; 1455 } 1456 EXPORT_SYMBOL_GPL(usbnet_probe); 1457 1458 /*-------------------------------------------------------------------------*/ 1459 1460 /* 1461 * suspend the whole driver as soon as the first interface is suspended 1462 * resume only when the last interface is resumed 1463 */ 1464 1465 int usbnet_suspend (struct usb_interface *intf, pm_message_t message) 1466 { 1467 struct usbnet *dev = usb_get_intfdata(intf); 1468 1469 if (!dev->suspend_count++) { 1470 spin_lock_irq(&dev->txq.lock); 1471 /* don't autosuspend while transmitting */ 1472 if (dev->txq.qlen && (message.event & PM_EVENT_AUTO)) { 1473 spin_unlock_irq(&dev->txq.lock); 1474 return -EBUSY; 1475 } else { 1476 set_bit(EVENT_DEV_ASLEEP, &dev->flags); 1477 spin_unlock_irq(&dev->txq.lock); 1478 } 1479 /* 1480 * accelerate emptying of the rx and queues, to avoid 1481 * having everything error out. 1482 */ 1483 netif_device_detach (dev->net); 1484 usbnet_terminate_urbs(dev); 1485 usb_kill_urb(dev->interrupt); 1486 1487 /* 1488 * reattach so runtime management can use and 1489 * wake the device 1490 */ 1491 netif_device_attach (dev->net); 1492 } 1493 return 0; 1494 } 1495 EXPORT_SYMBOL_GPL(usbnet_suspend); 1496 1497 int usbnet_resume (struct usb_interface *intf) 1498 { 1499 struct usbnet *dev = usb_get_intfdata(intf); 1500 struct sk_buff *skb; 1501 struct urb *res; 1502 int retval; 1503 1504 if (!--dev->suspend_count) { 1505 /* resume interrupt URBs */ 1506 if (dev->interrupt && test_bit(EVENT_DEV_OPEN, &dev->flags)) 1507 usb_submit_urb(dev->interrupt, GFP_NOIO); 1508 1509 spin_lock_irq(&dev->txq.lock); 1510 while ((res = usb_get_from_anchor(&dev->deferred))) { 1511 1512 skb = (struct sk_buff *)res->context; 1513 retval = usb_submit_urb(res, GFP_ATOMIC); 1514 if (retval < 0) { 1515 dev_kfree_skb_any(skb); 1516 usb_free_urb(res); 1517 usb_autopm_put_interface_async(dev->intf); 1518 } else { 1519 dev->net->trans_start = jiffies; 1520 __skb_queue_tail(&dev->txq, skb); 1521 } 1522 } 1523 1524 smp_mb(); 1525 clear_bit(EVENT_DEV_ASLEEP, &dev->flags); 1526 spin_unlock_irq(&dev->txq.lock); 1527 if (!(dev->txq.qlen >= TX_QLEN(dev))) 1528 netif_start_queue(dev->net); 1529 tasklet_schedule (&dev->bh); 1530 } 1531 return 0; 1532 } 1533 EXPORT_SYMBOL_GPL(usbnet_resume); 1534 1535 1536 /*-------------------------------------------------------------------------*/ 1537 1538 static int __init usbnet_init(void) 1539 { 1540 /* compiler should optimize this out */ 1541 BUILD_BUG_ON (sizeof (((struct sk_buff *)0)->cb) 1542 < sizeof (struct skb_data)); 1543 1544 random_ether_addr(node_id); 1545 return 0; 1546 } 1547 module_init(usbnet_init); 1548 1549 static void __exit usbnet_exit(void) 1550 { 1551 } 1552 module_exit(usbnet_exit); 1553 1554 MODULE_AUTHOR("David Brownell"); 1555 MODULE_DESCRIPTION("USB network driver framework"); 1556 MODULE_LICENSE("GPL"); 1557