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 * The goal is to let the USB host controller be busy for 5msec or 63 * more before an irq is required, under load. Jumbograms change 64 * the equation. 65 */ 66 #define MAX_QUEUE_MEMORY (60 * 1518) 67 #define RX_QLEN(dev) ((dev)->rx_qlen) 68 #define TX_QLEN(dev) ((dev)->tx_qlen) 69 70 // reawaken network queue this soon after stopping; else watchdog barks 71 #define TX_TIMEOUT_JIFFIES (5*HZ) 72 73 // throttle rx/tx briefly after some faults, so khubd might disconnect() 74 // us (it polls at HZ/4 usually) before we report too many false errors. 75 #define THROTTLE_JIFFIES (HZ/8) 76 77 // between wakeups 78 #define UNLINK_TIMEOUT_MS 3 79 80 /*-------------------------------------------------------------------------*/ 81 82 // randomly generated ethernet address 83 static u8 node_id [ETH_ALEN]; 84 85 static const char driver_name [] = "usbnet"; 86 87 /* use ethtool to change the level for any given device */ 88 static int msg_level = -1; 89 module_param (msg_level, int, 0); 90 MODULE_PARM_DESC (msg_level, "Override default message level"); 91 92 /*-------------------------------------------------------------------------*/ 93 94 /* handles CDC Ethernet and many other network "bulk data" interfaces */ 95 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf) 96 { 97 int tmp; 98 struct usb_host_interface *alt = NULL; 99 struct usb_host_endpoint *in = NULL, *out = NULL; 100 struct usb_host_endpoint *status = NULL; 101 102 for (tmp = 0; tmp < intf->num_altsetting; tmp++) { 103 unsigned ep; 104 105 in = out = status = NULL; 106 alt = intf->altsetting + tmp; 107 108 /* take the first altsetting with in-bulk + out-bulk; 109 * remember any status endpoint, just in case; 110 * ignore other endpoints and altsettings. 111 */ 112 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) { 113 struct usb_host_endpoint *e; 114 int intr = 0; 115 116 e = alt->endpoint + ep; 117 switch (e->desc.bmAttributes) { 118 case USB_ENDPOINT_XFER_INT: 119 if (!usb_endpoint_dir_in(&e->desc)) 120 continue; 121 intr = 1; 122 /* FALLTHROUGH */ 123 case USB_ENDPOINT_XFER_BULK: 124 break; 125 default: 126 continue; 127 } 128 if (usb_endpoint_dir_in(&e->desc)) { 129 if (!intr && !in) 130 in = e; 131 else if (intr && !status) 132 status = e; 133 } else { 134 if (!out) 135 out = e; 136 } 137 } 138 if (in && out) 139 break; 140 } 141 if (!alt || !in || !out) 142 return -EINVAL; 143 144 if (alt->desc.bAlternateSetting != 0 || 145 !(dev->driver_info->flags & FLAG_NO_SETINT)) { 146 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber, 147 alt->desc.bAlternateSetting); 148 if (tmp < 0) 149 return tmp; 150 } 151 152 dev->in = usb_rcvbulkpipe (dev->udev, 153 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 154 dev->out = usb_sndbulkpipe (dev->udev, 155 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 156 dev->status = status; 157 return 0; 158 } 159 EXPORT_SYMBOL_GPL(usbnet_get_endpoints); 160 161 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress) 162 { 163 int tmp, i; 164 unsigned char buf [13]; 165 166 tmp = usb_string(dev->udev, iMACAddress, buf, sizeof buf); 167 if (tmp != 12) { 168 dev_dbg(&dev->udev->dev, 169 "bad MAC string %d fetch, %d\n", iMACAddress, tmp); 170 if (tmp >= 0) 171 tmp = -EINVAL; 172 return tmp; 173 } 174 for (i = tmp = 0; i < 6; i++, tmp += 2) 175 dev->net->dev_addr [i] = 176 (hex_to_bin(buf[tmp]) << 4) + hex_to_bin(buf[tmp + 1]); 177 return 0; 178 } 179 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr); 180 181 static void intr_complete (struct urb *urb) 182 { 183 struct usbnet *dev = urb->context; 184 int status = urb->status; 185 186 switch (status) { 187 /* success */ 188 case 0: 189 dev->driver_info->status(dev, urb); 190 break; 191 192 /* software-driven interface shutdown */ 193 case -ENOENT: /* urb killed */ 194 case -ESHUTDOWN: /* hardware gone */ 195 netif_dbg(dev, ifdown, dev->net, 196 "intr shutdown, code %d\n", status); 197 return; 198 199 /* NOTE: not throttling like RX/TX, since this endpoint 200 * already polls infrequently 201 */ 202 default: 203 netdev_dbg(dev->net, "intr status %d\n", status); 204 break; 205 } 206 207 if (!netif_running (dev->net)) 208 return; 209 210 status = usb_submit_urb (urb, GFP_ATOMIC); 211 if (status != 0) 212 netif_err(dev, timer, dev->net, 213 "intr resubmit --> %d\n", status); 214 } 215 216 static int init_status (struct usbnet *dev, struct usb_interface *intf) 217 { 218 char *buf = NULL; 219 unsigned pipe = 0; 220 unsigned maxp; 221 unsigned period; 222 223 if (!dev->driver_info->status) 224 return 0; 225 226 pipe = usb_rcvintpipe (dev->udev, 227 dev->status->desc.bEndpointAddress 228 & USB_ENDPOINT_NUMBER_MASK); 229 maxp = usb_maxpacket (dev->udev, pipe, 0); 230 231 /* avoid 1 msec chatter: min 8 msec poll rate */ 232 period = max ((int) dev->status->desc.bInterval, 233 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3); 234 235 buf = kmalloc (maxp, GFP_KERNEL); 236 if (buf) { 237 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL); 238 if (!dev->interrupt) { 239 kfree (buf); 240 return -ENOMEM; 241 } else { 242 usb_fill_int_urb(dev->interrupt, dev->udev, pipe, 243 buf, maxp, intr_complete, dev, period); 244 dev->interrupt->transfer_flags |= URB_FREE_BUFFER; 245 dev_dbg(&intf->dev, 246 "status ep%din, %d bytes period %d\n", 247 usb_pipeendpoint(pipe), maxp, period); 248 } 249 } 250 return 0; 251 } 252 253 /* Submit the interrupt URB if not previously submitted, increasing refcount */ 254 int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags) 255 { 256 int ret = 0; 257 258 WARN_ON_ONCE(dev->interrupt == NULL); 259 if (dev->interrupt) { 260 mutex_lock(&dev->interrupt_mutex); 261 262 if (++dev->interrupt_count == 1) 263 ret = usb_submit_urb(dev->interrupt, mem_flags); 264 265 dev_dbg(&dev->udev->dev, "incremented interrupt URB count to %d\n", 266 dev->interrupt_count); 267 mutex_unlock(&dev->interrupt_mutex); 268 } 269 return ret; 270 } 271 EXPORT_SYMBOL_GPL(usbnet_status_start); 272 273 /* For resume; submit interrupt URB if previously submitted */ 274 static int __usbnet_status_start_force(struct usbnet *dev, gfp_t mem_flags) 275 { 276 int ret = 0; 277 278 mutex_lock(&dev->interrupt_mutex); 279 if (dev->interrupt_count) { 280 ret = usb_submit_urb(dev->interrupt, mem_flags); 281 dev_dbg(&dev->udev->dev, 282 "submitted interrupt URB for resume\n"); 283 } 284 mutex_unlock(&dev->interrupt_mutex); 285 return ret; 286 } 287 288 /* Kill the interrupt URB if all submitters want it killed */ 289 void usbnet_status_stop(struct usbnet *dev) 290 { 291 if (dev->interrupt) { 292 mutex_lock(&dev->interrupt_mutex); 293 WARN_ON(dev->interrupt_count == 0); 294 295 if (dev->interrupt_count && --dev->interrupt_count == 0) 296 usb_kill_urb(dev->interrupt); 297 298 dev_dbg(&dev->udev->dev, 299 "decremented interrupt URB count to %d\n", 300 dev->interrupt_count); 301 mutex_unlock(&dev->interrupt_mutex); 302 } 303 } 304 EXPORT_SYMBOL_GPL(usbnet_status_stop); 305 306 /* For suspend; always kill interrupt URB */ 307 static void __usbnet_status_stop_force(struct usbnet *dev) 308 { 309 if (dev->interrupt) { 310 mutex_lock(&dev->interrupt_mutex); 311 usb_kill_urb(dev->interrupt); 312 dev_dbg(&dev->udev->dev, "killed interrupt URB for suspend\n"); 313 mutex_unlock(&dev->interrupt_mutex); 314 } 315 } 316 317 /* Passes this packet up the stack, updating its accounting. 318 * Some link protocols batch packets, so their rx_fixup paths 319 * can return clones as well as just modify the original skb. 320 */ 321 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb) 322 { 323 int status; 324 325 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) { 326 skb_queue_tail(&dev->rxq_pause, skb); 327 return; 328 } 329 330 skb->protocol = eth_type_trans (skb, dev->net); 331 dev->net->stats.rx_packets++; 332 dev->net->stats.rx_bytes += skb->len; 333 334 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n", 335 skb->len + sizeof (struct ethhdr), skb->protocol); 336 memset (skb->cb, 0, sizeof (struct skb_data)); 337 338 if (skb_defer_rx_timestamp(skb)) 339 return; 340 341 status = netif_rx (skb); 342 if (status != NET_RX_SUCCESS) 343 netif_dbg(dev, rx_err, dev->net, 344 "netif_rx status %d\n", status); 345 } 346 EXPORT_SYMBOL_GPL(usbnet_skb_return); 347 348 /* must be called if hard_mtu or rx_urb_size changed */ 349 void usbnet_update_max_qlen(struct usbnet *dev) 350 { 351 enum usb_device_speed speed = dev->udev->speed; 352 353 switch (speed) { 354 case USB_SPEED_HIGH: 355 dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size; 356 dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu; 357 break; 358 case USB_SPEED_SUPER: 359 /* 360 * Not take default 5ms qlen for super speed HC to 361 * save memory, and iperf tests show 2.5ms qlen can 362 * work well 363 */ 364 dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size; 365 dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu; 366 break; 367 default: 368 dev->rx_qlen = dev->tx_qlen = 4; 369 } 370 } 371 EXPORT_SYMBOL_GPL(usbnet_update_max_qlen); 372 373 374 /*------------------------------------------------------------------------- 375 * 376 * Network Device Driver (peer link to "Host Device", from USB host) 377 * 378 *-------------------------------------------------------------------------*/ 379 380 int usbnet_change_mtu (struct net_device *net, int new_mtu) 381 { 382 struct usbnet *dev = netdev_priv(net); 383 int ll_mtu = new_mtu + net->hard_header_len; 384 int old_hard_mtu = dev->hard_mtu; 385 int old_rx_urb_size = dev->rx_urb_size; 386 387 if (new_mtu <= 0) 388 return -EINVAL; 389 // no second zero-length packet read wanted after mtu-sized packets 390 if ((ll_mtu % dev->maxpacket) == 0) 391 return -EDOM; 392 net->mtu = new_mtu; 393 394 dev->hard_mtu = net->mtu + net->hard_header_len; 395 if (dev->rx_urb_size == old_hard_mtu) { 396 dev->rx_urb_size = dev->hard_mtu; 397 if (dev->rx_urb_size > old_rx_urb_size) 398 usbnet_unlink_rx_urbs(dev); 399 } 400 401 /* max qlen depend on hard_mtu and rx_urb_size */ 402 usbnet_update_max_qlen(dev); 403 404 return 0; 405 } 406 EXPORT_SYMBOL_GPL(usbnet_change_mtu); 407 408 /* The caller must hold list->lock */ 409 static void __usbnet_queue_skb(struct sk_buff_head *list, 410 struct sk_buff *newsk, enum skb_state state) 411 { 412 struct skb_data *entry = (struct skb_data *) newsk->cb; 413 414 __skb_queue_tail(list, newsk); 415 entry->state = state; 416 } 417 418 /*-------------------------------------------------------------------------*/ 419 420 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from 421 * completion callbacks. 2.5 should have fixed those bugs... 422 */ 423 424 static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb, 425 struct sk_buff_head *list, enum skb_state state) 426 { 427 unsigned long flags; 428 enum skb_state old_state; 429 struct skb_data *entry = (struct skb_data *) skb->cb; 430 431 spin_lock_irqsave(&list->lock, flags); 432 old_state = entry->state; 433 entry->state = state; 434 __skb_unlink(skb, list); 435 spin_unlock(&list->lock); 436 spin_lock(&dev->done.lock); 437 __skb_queue_tail(&dev->done, skb); 438 if (dev->done.qlen == 1) 439 tasklet_schedule(&dev->bh); 440 spin_unlock_irqrestore(&dev->done.lock, flags); 441 return old_state; 442 } 443 444 /* some work can't be done in tasklets, so we use keventd 445 * 446 * NOTE: annoying asymmetry: if it's active, schedule_work() fails, 447 * but tasklet_schedule() doesn't. hope the failure is rare. 448 */ 449 void usbnet_defer_kevent (struct usbnet *dev, int work) 450 { 451 set_bit (work, &dev->flags); 452 if (!schedule_work (&dev->kevent)) { 453 if (net_ratelimit()) 454 netdev_err(dev->net, "kevent %d may have been dropped\n", work); 455 } else { 456 netdev_dbg(dev->net, "kevent %d scheduled\n", work); 457 } 458 } 459 EXPORT_SYMBOL_GPL(usbnet_defer_kevent); 460 461 /*-------------------------------------------------------------------------*/ 462 463 static void rx_complete (struct urb *urb); 464 465 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) 466 { 467 struct sk_buff *skb; 468 struct skb_data *entry; 469 int retval = 0; 470 unsigned long lockflags; 471 size_t size = dev->rx_urb_size; 472 473 /* prevent rx skb allocation when error ratio is high */ 474 if (test_bit(EVENT_RX_KILL, &dev->flags)) { 475 usb_free_urb(urb); 476 return -ENOLINK; 477 } 478 479 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags); 480 if (!skb) { 481 netif_dbg(dev, rx_err, dev->net, "no rx skb\n"); 482 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 483 usb_free_urb (urb); 484 return -ENOMEM; 485 } 486 487 entry = (struct skb_data *) skb->cb; 488 entry->urb = urb; 489 entry->dev = dev; 490 entry->length = 0; 491 492 usb_fill_bulk_urb (urb, dev->udev, dev->in, 493 skb->data, size, rx_complete, skb); 494 495 spin_lock_irqsave (&dev->rxq.lock, lockflags); 496 497 if (netif_running (dev->net) && 498 netif_device_present (dev->net) && 499 !test_bit (EVENT_RX_HALT, &dev->flags) && 500 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) { 501 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) { 502 case -EPIPE: 503 usbnet_defer_kevent (dev, EVENT_RX_HALT); 504 break; 505 case -ENOMEM: 506 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 507 break; 508 case -ENODEV: 509 netif_dbg(dev, ifdown, dev->net, "device gone\n"); 510 netif_device_detach (dev->net); 511 break; 512 case -EHOSTUNREACH: 513 retval = -ENOLINK; 514 break; 515 default: 516 netif_dbg(dev, rx_err, dev->net, 517 "rx submit, %d\n", retval); 518 tasklet_schedule (&dev->bh); 519 break; 520 case 0: 521 __usbnet_queue_skb(&dev->rxq, skb, rx_start); 522 } 523 } else { 524 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n"); 525 retval = -ENOLINK; 526 } 527 spin_unlock_irqrestore (&dev->rxq.lock, lockflags); 528 if (retval) { 529 dev_kfree_skb_any (skb); 530 usb_free_urb (urb); 531 } 532 return retval; 533 } 534 535 536 /*-------------------------------------------------------------------------*/ 537 538 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb) 539 { 540 if (dev->driver_info->rx_fixup && 541 !dev->driver_info->rx_fixup (dev, skb)) { 542 /* With RX_ASSEMBLE, rx_fixup() must update counters */ 543 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE)) 544 dev->net->stats.rx_errors++; 545 goto done; 546 } 547 // else network stack removes extra byte if we forced a short packet 548 549 if (skb->len) { 550 /* all data was already cloned from skb inside the driver */ 551 if (dev->driver_info->flags & FLAG_MULTI_PACKET) 552 dev_kfree_skb_any(skb); 553 else 554 usbnet_skb_return(dev, skb); 555 return; 556 } 557 558 netif_dbg(dev, rx_err, dev->net, "drop\n"); 559 dev->net->stats.rx_errors++; 560 done: 561 skb_queue_tail(&dev->done, skb); 562 } 563 564 /*-------------------------------------------------------------------------*/ 565 566 static void rx_complete (struct urb *urb) 567 { 568 struct sk_buff *skb = (struct sk_buff *) urb->context; 569 struct skb_data *entry = (struct skb_data *) skb->cb; 570 struct usbnet *dev = entry->dev; 571 int urb_status = urb->status; 572 enum skb_state state; 573 574 skb_put (skb, urb->actual_length); 575 state = rx_done; 576 entry->urb = NULL; 577 578 switch (urb_status) { 579 /* success */ 580 case 0: 581 if (skb->len < dev->net->hard_header_len) { 582 state = rx_cleanup; 583 dev->net->stats.rx_errors++; 584 dev->net->stats.rx_length_errors++; 585 netif_dbg(dev, rx_err, dev->net, 586 "rx length %d\n", skb->len); 587 } 588 break; 589 590 /* stalls need manual reset. this is rare ... except that 591 * when going through USB 2.0 TTs, unplug appears this way. 592 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ 593 * storm, recovering as needed. 594 */ 595 case -EPIPE: 596 dev->net->stats.rx_errors++; 597 usbnet_defer_kevent (dev, EVENT_RX_HALT); 598 // FALLTHROUGH 599 600 /* software-driven interface shutdown */ 601 case -ECONNRESET: /* async unlink */ 602 case -ESHUTDOWN: /* hardware gone */ 603 netif_dbg(dev, ifdown, dev->net, 604 "rx shutdown, code %d\n", urb_status); 605 goto block; 606 607 /* we get controller i/o faults during khubd disconnect() delays. 608 * throttle down resubmits, to avoid log floods; just temporarily, 609 * so we still recover when the fault isn't a khubd delay. 610 */ 611 case -EPROTO: 612 case -ETIME: 613 case -EILSEQ: 614 dev->net->stats.rx_errors++; 615 if (!timer_pending (&dev->delay)) { 616 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); 617 netif_dbg(dev, link, dev->net, 618 "rx throttle %d\n", urb_status); 619 } 620 block: 621 state = rx_cleanup; 622 entry->urb = urb; 623 urb = NULL; 624 break; 625 626 /* data overrun ... flush fifo? */ 627 case -EOVERFLOW: 628 dev->net->stats.rx_over_errors++; 629 // FALLTHROUGH 630 631 default: 632 state = rx_cleanup; 633 dev->net->stats.rx_errors++; 634 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status); 635 break; 636 } 637 638 /* stop rx if packet error rate is high */ 639 if (++dev->pkt_cnt > 30) { 640 dev->pkt_cnt = 0; 641 dev->pkt_err = 0; 642 } else { 643 if (state == rx_cleanup) 644 dev->pkt_err++; 645 if (dev->pkt_err > 20) 646 set_bit(EVENT_RX_KILL, &dev->flags); 647 } 648 649 state = defer_bh(dev, skb, &dev->rxq, state); 650 651 if (urb) { 652 if (netif_running (dev->net) && 653 !test_bit (EVENT_RX_HALT, &dev->flags) && 654 state != unlink_start) { 655 rx_submit (dev, urb, GFP_ATOMIC); 656 usb_mark_last_busy(dev->udev); 657 return; 658 } 659 usb_free_urb (urb); 660 } 661 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n"); 662 } 663 664 /*-------------------------------------------------------------------------*/ 665 void usbnet_pause_rx(struct usbnet *dev) 666 { 667 set_bit(EVENT_RX_PAUSED, &dev->flags); 668 669 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n"); 670 } 671 EXPORT_SYMBOL_GPL(usbnet_pause_rx); 672 673 void usbnet_resume_rx(struct usbnet *dev) 674 { 675 struct sk_buff *skb; 676 int num = 0; 677 678 clear_bit(EVENT_RX_PAUSED, &dev->flags); 679 680 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) { 681 usbnet_skb_return(dev, skb); 682 num++; 683 } 684 685 tasklet_schedule(&dev->bh); 686 687 netif_dbg(dev, rx_status, dev->net, 688 "paused rx queue disabled, %d skbs requeued\n", num); 689 } 690 EXPORT_SYMBOL_GPL(usbnet_resume_rx); 691 692 void usbnet_purge_paused_rxq(struct usbnet *dev) 693 { 694 skb_queue_purge(&dev->rxq_pause); 695 } 696 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq); 697 698 /*-------------------------------------------------------------------------*/ 699 700 // unlink pending rx/tx; completion handlers do all other cleanup 701 702 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) 703 { 704 unsigned long flags; 705 struct sk_buff *skb; 706 int count = 0; 707 708 spin_lock_irqsave (&q->lock, flags); 709 while (!skb_queue_empty(q)) { 710 struct skb_data *entry; 711 struct urb *urb; 712 int retval; 713 714 skb_queue_walk(q, skb) { 715 entry = (struct skb_data *) skb->cb; 716 if (entry->state != unlink_start) 717 goto found; 718 } 719 break; 720 found: 721 entry->state = unlink_start; 722 urb = entry->urb; 723 724 /* 725 * Get reference count of the URB to avoid it to be 726 * freed during usb_unlink_urb, which may trigger 727 * use-after-free problem inside usb_unlink_urb since 728 * usb_unlink_urb is always racing with .complete 729 * handler(include defer_bh). 730 */ 731 usb_get_urb(urb); 732 spin_unlock_irqrestore(&q->lock, flags); 733 // during some PM-driven resume scenarios, 734 // these (async) unlinks complete immediately 735 retval = usb_unlink_urb (urb); 736 if (retval != -EINPROGRESS && retval != 0) 737 netdev_dbg(dev->net, "unlink urb err, %d\n", retval); 738 else 739 count++; 740 usb_put_urb(urb); 741 spin_lock_irqsave(&q->lock, flags); 742 } 743 spin_unlock_irqrestore (&q->lock, flags); 744 return count; 745 } 746 747 // Flush all pending rx urbs 748 // minidrivers may need to do this when the MTU changes 749 750 void usbnet_unlink_rx_urbs(struct usbnet *dev) 751 { 752 if (netif_running(dev->net)) { 753 (void) unlink_urbs (dev, &dev->rxq); 754 tasklet_schedule(&dev->bh); 755 } 756 } 757 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); 758 759 /*-------------------------------------------------------------------------*/ 760 761 // precondition: never called in_interrupt 762 static void usbnet_terminate_urbs(struct usbnet *dev) 763 { 764 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup); 765 DECLARE_WAITQUEUE(wait, current); 766 int temp; 767 768 /* ensure there are no more active urbs */ 769 add_wait_queue(&unlink_wakeup, &wait); 770 set_current_state(TASK_UNINTERRUPTIBLE); 771 dev->wait = &unlink_wakeup; 772 temp = unlink_urbs(dev, &dev->txq) + 773 unlink_urbs(dev, &dev->rxq); 774 775 /* maybe wait for deletions to finish. */ 776 while (!skb_queue_empty(&dev->rxq) 777 && !skb_queue_empty(&dev->txq) 778 && !skb_queue_empty(&dev->done)) { 779 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS)); 780 set_current_state(TASK_UNINTERRUPTIBLE); 781 netif_dbg(dev, ifdown, dev->net, 782 "waited for %d urb completions\n", temp); 783 } 784 set_current_state(TASK_RUNNING); 785 dev->wait = NULL; 786 remove_wait_queue(&unlink_wakeup, &wait); 787 } 788 789 int usbnet_stop (struct net_device *net) 790 { 791 struct usbnet *dev = netdev_priv(net); 792 struct driver_info *info = dev->driver_info; 793 int retval; 794 795 clear_bit(EVENT_DEV_OPEN, &dev->flags); 796 netif_stop_queue (net); 797 798 netif_info(dev, ifdown, dev->net, 799 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n", 800 net->stats.rx_packets, net->stats.tx_packets, 801 net->stats.rx_errors, net->stats.tx_errors); 802 803 /* allow minidriver to stop correctly (wireless devices to turn off 804 * radio etc) */ 805 if (info->stop) { 806 retval = info->stop(dev); 807 if (retval < 0) 808 netif_info(dev, ifdown, dev->net, 809 "stop fail (%d) usbnet usb-%s-%s, %s\n", 810 retval, 811 dev->udev->bus->bus_name, dev->udev->devpath, 812 info->description); 813 } 814 815 if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) 816 usbnet_terminate_urbs(dev); 817 818 usbnet_status_stop(dev); 819 820 usbnet_purge_paused_rxq(dev); 821 822 /* deferred work (task, timer, softirq) must also stop. 823 * can't flush_scheduled_work() until we drop rtnl (later), 824 * else workers could deadlock; so make workers a NOP. 825 */ 826 dev->flags = 0; 827 del_timer_sync (&dev->delay); 828 tasklet_kill (&dev->bh); 829 if (info->manage_power && 830 !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags)) 831 info->manage_power(dev, 0); 832 else 833 usb_autopm_put_interface(dev->intf); 834 835 return 0; 836 } 837 EXPORT_SYMBOL_GPL(usbnet_stop); 838 839 /*-------------------------------------------------------------------------*/ 840 841 // posts reads, and enables write queuing 842 843 // precondition: never called in_interrupt 844 845 int usbnet_open (struct net_device *net) 846 { 847 struct usbnet *dev = netdev_priv(net); 848 int retval; 849 struct driver_info *info = dev->driver_info; 850 851 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { 852 netif_info(dev, ifup, dev->net, 853 "resumption fail (%d) usbnet usb-%s-%s, %s\n", 854 retval, 855 dev->udev->bus->bus_name, 856 dev->udev->devpath, 857 info->description); 858 goto done_nopm; 859 } 860 861 // put into "known safe" state 862 if (info->reset && (retval = info->reset (dev)) < 0) { 863 netif_info(dev, ifup, dev->net, 864 "open reset fail (%d) usbnet usb-%s-%s, %s\n", 865 retval, 866 dev->udev->bus->bus_name, 867 dev->udev->devpath, 868 info->description); 869 goto done; 870 } 871 872 /* hard_mtu or rx_urb_size may change in reset() */ 873 usbnet_update_max_qlen(dev); 874 875 // insist peer be connected 876 if (info->check_connect && (retval = info->check_connect (dev)) < 0) { 877 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval); 878 goto done; 879 } 880 881 /* start any status interrupt transfer */ 882 if (dev->interrupt) { 883 retval = usbnet_status_start(dev, GFP_KERNEL); 884 if (retval < 0) { 885 netif_err(dev, ifup, dev->net, 886 "intr submit %d\n", retval); 887 goto done; 888 } 889 } 890 891 set_bit(EVENT_DEV_OPEN, &dev->flags); 892 netif_start_queue (net); 893 netif_info(dev, ifup, dev->net, 894 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n", 895 (int)RX_QLEN(dev), (int)TX_QLEN(dev), 896 dev->net->mtu, 897 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" : 898 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" : 899 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" : 900 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" : 901 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" : 902 "simple"); 903 904 /* reset rx error state */ 905 dev->pkt_cnt = 0; 906 dev->pkt_err = 0; 907 clear_bit(EVENT_RX_KILL, &dev->flags); 908 909 // delay posting reads until we're fully open 910 tasklet_schedule (&dev->bh); 911 if (info->manage_power) { 912 retval = info->manage_power(dev, 1); 913 if (retval < 0) { 914 retval = 0; 915 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags); 916 } else { 917 usb_autopm_put_interface(dev->intf); 918 } 919 } 920 return retval; 921 done: 922 usb_autopm_put_interface(dev->intf); 923 done_nopm: 924 return retval; 925 } 926 EXPORT_SYMBOL_GPL(usbnet_open); 927 928 /*-------------------------------------------------------------------------*/ 929 930 /* ethtool methods; minidrivers may need to add some more, but 931 * they'll probably want to use this base set. 932 */ 933 934 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd) 935 { 936 struct usbnet *dev = netdev_priv(net); 937 938 if (!dev->mii.mdio_read) 939 return -EOPNOTSUPP; 940 941 return mii_ethtool_gset(&dev->mii, cmd); 942 } 943 EXPORT_SYMBOL_GPL(usbnet_get_settings); 944 945 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd) 946 { 947 struct usbnet *dev = netdev_priv(net); 948 int retval; 949 950 if (!dev->mii.mdio_write) 951 return -EOPNOTSUPP; 952 953 retval = mii_ethtool_sset(&dev->mii, cmd); 954 955 /* link speed/duplex might have changed */ 956 if (dev->driver_info->link_reset) 957 dev->driver_info->link_reset(dev); 958 959 /* hard_mtu or rx_urb_size may change in link_reset() */ 960 usbnet_update_max_qlen(dev); 961 962 return retval; 963 964 } 965 EXPORT_SYMBOL_GPL(usbnet_set_settings); 966 967 u32 usbnet_get_link (struct net_device *net) 968 { 969 struct usbnet *dev = netdev_priv(net); 970 971 /* If a check_connect is defined, return its result */ 972 if (dev->driver_info->check_connect) 973 return dev->driver_info->check_connect (dev) == 0; 974 975 /* if the device has mii operations, use those */ 976 if (dev->mii.mdio_read) 977 return mii_link_ok(&dev->mii); 978 979 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ 980 return ethtool_op_get_link(net); 981 } 982 EXPORT_SYMBOL_GPL(usbnet_get_link); 983 984 int usbnet_nway_reset(struct net_device *net) 985 { 986 struct usbnet *dev = netdev_priv(net); 987 988 if (!dev->mii.mdio_write) 989 return -EOPNOTSUPP; 990 991 return mii_nway_restart(&dev->mii); 992 } 993 EXPORT_SYMBOL_GPL(usbnet_nway_reset); 994 995 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) 996 { 997 struct usbnet *dev = netdev_priv(net); 998 999 strlcpy (info->driver, dev->driver_name, sizeof info->driver); 1000 strlcpy (info->version, DRIVER_VERSION, sizeof info->version); 1001 strlcpy (info->fw_version, dev->driver_info->description, 1002 sizeof info->fw_version); 1003 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); 1004 } 1005 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); 1006 1007 u32 usbnet_get_msglevel (struct net_device *net) 1008 { 1009 struct usbnet *dev = netdev_priv(net); 1010 1011 return dev->msg_enable; 1012 } 1013 EXPORT_SYMBOL_GPL(usbnet_get_msglevel); 1014 1015 void usbnet_set_msglevel (struct net_device *net, u32 level) 1016 { 1017 struct usbnet *dev = netdev_priv(net); 1018 1019 dev->msg_enable = level; 1020 } 1021 EXPORT_SYMBOL_GPL(usbnet_set_msglevel); 1022 1023 /* drivers may override default ethtool_ops in their bind() routine */ 1024 static const struct ethtool_ops usbnet_ethtool_ops = { 1025 .get_settings = usbnet_get_settings, 1026 .set_settings = usbnet_set_settings, 1027 .get_link = usbnet_get_link, 1028 .nway_reset = usbnet_nway_reset, 1029 .get_drvinfo = usbnet_get_drvinfo, 1030 .get_msglevel = usbnet_get_msglevel, 1031 .set_msglevel = usbnet_set_msglevel, 1032 .get_ts_info = ethtool_op_get_ts_info, 1033 }; 1034 1035 /*-------------------------------------------------------------------------*/ 1036 1037 static void __handle_link_change(struct usbnet *dev) 1038 { 1039 if (!test_bit(EVENT_DEV_OPEN, &dev->flags)) 1040 return; 1041 1042 if (!netif_carrier_ok(dev->net)) { 1043 /* kill URBs for reading packets to save bus bandwidth */ 1044 unlink_urbs(dev, &dev->rxq); 1045 1046 /* 1047 * tx_timeout will unlink URBs for sending packets and 1048 * tx queue is stopped by netcore after link becomes off 1049 */ 1050 } else { 1051 /* submitting URBs for reading packets */ 1052 tasklet_schedule(&dev->bh); 1053 } 1054 1055 /* hard_mtu or rx_urb_size may change during link change */ 1056 usbnet_update_max_qlen(dev); 1057 1058 clear_bit(EVENT_LINK_CHANGE, &dev->flags); 1059 } 1060 1061 /* work that cannot be done in interrupt context uses keventd. 1062 * 1063 * NOTE: with 2.5 we could do more of this using completion callbacks, 1064 * especially now that control transfers can be queued. 1065 */ 1066 static void 1067 kevent (struct work_struct *work) 1068 { 1069 struct usbnet *dev = 1070 container_of(work, struct usbnet, kevent); 1071 int status; 1072 1073 /* usb_clear_halt() needs a thread context */ 1074 if (test_bit (EVENT_TX_HALT, &dev->flags)) { 1075 unlink_urbs (dev, &dev->txq); 1076 status = usb_autopm_get_interface(dev->intf); 1077 if (status < 0) 1078 goto fail_pipe; 1079 status = usb_clear_halt (dev->udev, dev->out); 1080 usb_autopm_put_interface(dev->intf); 1081 if (status < 0 && 1082 status != -EPIPE && 1083 status != -ESHUTDOWN) { 1084 if (netif_msg_tx_err (dev)) 1085 fail_pipe: 1086 netdev_err(dev->net, "can't clear tx halt, status %d\n", 1087 status); 1088 } else { 1089 clear_bit (EVENT_TX_HALT, &dev->flags); 1090 if (status != -ESHUTDOWN) 1091 netif_wake_queue (dev->net); 1092 } 1093 } 1094 if (test_bit (EVENT_RX_HALT, &dev->flags)) { 1095 unlink_urbs (dev, &dev->rxq); 1096 status = usb_autopm_get_interface(dev->intf); 1097 if (status < 0) 1098 goto fail_halt; 1099 status = usb_clear_halt (dev->udev, dev->in); 1100 usb_autopm_put_interface(dev->intf); 1101 if (status < 0 && 1102 status != -EPIPE && 1103 status != -ESHUTDOWN) { 1104 if (netif_msg_rx_err (dev)) 1105 fail_halt: 1106 netdev_err(dev->net, "can't clear rx halt, status %d\n", 1107 status); 1108 } else { 1109 clear_bit (EVENT_RX_HALT, &dev->flags); 1110 tasklet_schedule (&dev->bh); 1111 } 1112 } 1113 1114 /* tasklet could resubmit itself forever if memory is tight */ 1115 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { 1116 struct urb *urb = NULL; 1117 int resched = 1; 1118 1119 if (netif_running (dev->net)) 1120 urb = usb_alloc_urb (0, GFP_KERNEL); 1121 else 1122 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1123 if (urb != NULL) { 1124 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1125 status = usb_autopm_get_interface(dev->intf); 1126 if (status < 0) { 1127 usb_free_urb(urb); 1128 goto fail_lowmem; 1129 } 1130 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) 1131 resched = 0; 1132 usb_autopm_put_interface(dev->intf); 1133 fail_lowmem: 1134 if (resched) 1135 tasklet_schedule (&dev->bh); 1136 } 1137 } 1138 1139 if (test_bit (EVENT_LINK_RESET, &dev->flags)) { 1140 struct driver_info *info = dev->driver_info; 1141 int retval = 0; 1142 1143 clear_bit (EVENT_LINK_RESET, &dev->flags); 1144 status = usb_autopm_get_interface(dev->intf); 1145 if (status < 0) 1146 goto skip_reset; 1147 if(info->link_reset && (retval = info->link_reset(dev)) < 0) { 1148 usb_autopm_put_interface(dev->intf); 1149 skip_reset: 1150 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", 1151 retval, 1152 dev->udev->bus->bus_name, 1153 dev->udev->devpath, 1154 info->description); 1155 } else { 1156 usb_autopm_put_interface(dev->intf); 1157 } 1158 1159 /* handle link change from link resetting */ 1160 __handle_link_change(dev); 1161 } 1162 1163 if (test_bit (EVENT_LINK_CHANGE, &dev->flags)) 1164 __handle_link_change(dev); 1165 1166 if (dev->flags) 1167 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); 1168 } 1169 1170 /*-------------------------------------------------------------------------*/ 1171 1172 static void tx_complete (struct urb *urb) 1173 { 1174 struct sk_buff *skb = (struct sk_buff *) urb->context; 1175 struct skb_data *entry = (struct skb_data *) skb->cb; 1176 struct usbnet *dev = entry->dev; 1177 1178 if (urb->status == 0) { 1179 if (!(dev->driver_info->flags & FLAG_MULTI_PACKET)) 1180 dev->net->stats.tx_packets++; 1181 dev->net->stats.tx_bytes += entry->length; 1182 } else { 1183 dev->net->stats.tx_errors++; 1184 1185 switch (urb->status) { 1186 case -EPIPE: 1187 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1188 break; 1189 1190 /* software-driven interface shutdown */ 1191 case -ECONNRESET: // async unlink 1192 case -ESHUTDOWN: // hardware gone 1193 break; 1194 1195 // like rx, tx gets controller i/o faults during khubd delays 1196 // and so it uses the same throttling mechanism. 1197 case -EPROTO: 1198 case -ETIME: 1199 case -EILSEQ: 1200 usb_mark_last_busy(dev->udev); 1201 if (!timer_pending (&dev->delay)) { 1202 mod_timer (&dev->delay, 1203 jiffies + THROTTLE_JIFFIES); 1204 netif_dbg(dev, link, dev->net, 1205 "tx throttle %d\n", urb->status); 1206 } 1207 netif_stop_queue (dev->net); 1208 break; 1209 default: 1210 netif_dbg(dev, tx_err, dev->net, 1211 "tx err %d\n", entry->urb->status); 1212 break; 1213 } 1214 } 1215 1216 usb_autopm_put_interface_async(dev->intf); 1217 (void) defer_bh(dev, skb, &dev->txq, tx_done); 1218 } 1219 1220 /*-------------------------------------------------------------------------*/ 1221 1222 void usbnet_tx_timeout (struct net_device *net) 1223 { 1224 struct usbnet *dev = netdev_priv(net); 1225 1226 unlink_urbs (dev, &dev->txq); 1227 tasklet_schedule (&dev->bh); 1228 1229 // FIXME: device recovery -- reset? 1230 } 1231 EXPORT_SYMBOL_GPL(usbnet_tx_timeout); 1232 1233 /*-------------------------------------------------------------------------*/ 1234 1235 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, 1236 struct net_device *net) 1237 { 1238 struct usbnet *dev = netdev_priv(net); 1239 int length; 1240 struct urb *urb = NULL; 1241 struct skb_data *entry; 1242 struct driver_info *info = dev->driver_info; 1243 unsigned long flags; 1244 int retval; 1245 1246 if (skb) 1247 skb_tx_timestamp(skb); 1248 1249 // some devices want funky USB-level framing, for 1250 // win32 driver (usually) and/or hardware quirks 1251 if (info->tx_fixup) { 1252 skb = info->tx_fixup (dev, skb, GFP_ATOMIC); 1253 if (!skb) { 1254 /* packet collected; minidriver waiting for more */ 1255 if (info->flags & FLAG_MULTI_PACKET) 1256 goto not_drop; 1257 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); 1258 goto drop; 1259 } 1260 } 1261 length = skb->len; 1262 1263 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { 1264 netif_dbg(dev, tx_err, dev->net, "no urb\n"); 1265 goto drop; 1266 } 1267 1268 entry = (struct skb_data *) skb->cb; 1269 entry->urb = urb; 1270 entry->dev = dev; 1271 entry->length = length; 1272 1273 usb_fill_bulk_urb (urb, dev->udev, dev->out, 1274 skb->data, skb->len, tx_complete, skb); 1275 1276 /* don't assume the hardware handles USB_ZERO_PACKET 1277 * NOTE: strictly conforming cdc-ether devices should expect 1278 * the ZLP here, but ignore the one-byte packet. 1279 * NOTE2: CDC NCM specification is different from CDC ECM when 1280 * handling ZLP/short packets, so cdc_ncm driver will make short 1281 * packet itself if needed. 1282 */ 1283 if (length % dev->maxpacket == 0) { 1284 if (!(info->flags & FLAG_SEND_ZLP)) { 1285 if (!(info->flags & FLAG_MULTI_PACKET)) { 1286 urb->transfer_buffer_length++; 1287 if (skb_tailroom(skb)) { 1288 skb->data[skb->len] = 0; 1289 __skb_put(skb, 1); 1290 } 1291 } 1292 } else 1293 urb->transfer_flags |= URB_ZERO_PACKET; 1294 } 1295 1296 spin_lock_irqsave(&dev->txq.lock, flags); 1297 retval = usb_autopm_get_interface_async(dev->intf); 1298 if (retval < 0) { 1299 spin_unlock_irqrestore(&dev->txq.lock, flags); 1300 goto drop; 1301 } 1302 1303 #ifdef CONFIG_PM 1304 /* if this triggers the device is still a sleep */ 1305 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { 1306 /* transmission will be done in resume */ 1307 usb_anchor_urb(urb, &dev->deferred); 1308 /* no use to process more packets */ 1309 netif_stop_queue(net); 1310 usb_put_urb(urb); 1311 spin_unlock_irqrestore(&dev->txq.lock, flags); 1312 netdev_dbg(dev->net, "Delaying transmission for resumption\n"); 1313 goto deferred; 1314 } 1315 #endif 1316 1317 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { 1318 case -EPIPE: 1319 netif_stop_queue (net); 1320 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1321 usb_autopm_put_interface_async(dev->intf); 1322 break; 1323 default: 1324 usb_autopm_put_interface_async(dev->intf); 1325 netif_dbg(dev, tx_err, dev->net, 1326 "tx: submit urb err %d\n", retval); 1327 break; 1328 case 0: 1329 net->trans_start = jiffies; 1330 __usbnet_queue_skb(&dev->txq, skb, tx_start); 1331 if (dev->txq.qlen >= TX_QLEN (dev)) 1332 netif_stop_queue (net); 1333 } 1334 spin_unlock_irqrestore (&dev->txq.lock, flags); 1335 1336 if (retval) { 1337 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); 1338 drop: 1339 dev->net->stats.tx_dropped++; 1340 not_drop: 1341 if (skb) 1342 dev_kfree_skb_any (skb); 1343 usb_free_urb (urb); 1344 } else 1345 netif_dbg(dev, tx_queued, dev->net, 1346 "> tx, len %d, type 0x%x\n", length, skb->protocol); 1347 #ifdef CONFIG_PM 1348 deferred: 1349 #endif 1350 return NETDEV_TX_OK; 1351 } 1352 EXPORT_SYMBOL_GPL(usbnet_start_xmit); 1353 1354 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags) 1355 { 1356 struct urb *urb; 1357 int i; 1358 int ret = 0; 1359 1360 /* don't refill the queue all at once */ 1361 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) { 1362 urb = usb_alloc_urb(0, flags); 1363 if (urb != NULL) { 1364 ret = rx_submit(dev, urb, flags); 1365 if (ret) 1366 goto err; 1367 } else { 1368 ret = -ENOMEM; 1369 goto err; 1370 } 1371 } 1372 err: 1373 return ret; 1374 } 1375 1376 /*-------------------------------------------------------------------------*/ 1377 1378 // tasklet (work deferred from completions, in_irq) or timer 1379 1380 static void usbnet_bh (unsigned long param) 1381 { 1382 struct usbnet *dev = (struct usbnet *) param; 1383 struct sk_buff *skb; 1384 struct skb_data *entry; 1385 1386 while ((skb = skb_dequeue (&dev->done))) { 1387 entry = (struct skb_data *) skb->cb; 1388 switch (entry->state) { 1389 case rx_done: 1390 entry->state = rx_cleanup; 1391 rx_process (dev, skb); 1392 continue; 1393 case tx_done: 1394 case rx_cleanup: 1395 usb_free_urb (entry->urb); 1396 dev_kfree_skb (skb); 1397 continue; 1398 default: 1399 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); 1400 } 1401 } 1402 1403 /* restart RX again after disabling due to high error rate */ 1404 clear_bit(EVENT_RX_KILL, &dev->flags); 1405 1406 // waiting for all pending urbs to complete? 1407 if (dev->wait) { 1408 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) { 1409 wake_up (dev->wait); 1410 } 1411 1412 // or are we maybe short a few urbs? 1413 } else if (netif_running (dev->net) && 1414 netif_device_present (dev->net) && 1415 netif_carrier_ok(dev->net) && 1416 !timer_pending (&dev->delay) && 1417 !test_bit (EVENT_RX_HALT, &dev->flags)) { 1418 int temp = dev->rxq.qlen; 1419 1420 if (temp < RX_QLEN(dev)) { 1421 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK) 1422 return; 1423 if (temp != dev->rxq.qlen) 1424 netif_dbg(dev, link, dev->net, 1425 "rxqlen %d --> %d\n", 1426 temp, dev->rxq.qlen); 1427 if (dev->rxq.qlen < RX_QLEN(dev)) 1428 tasklet_schedule (&dev->bh); 1429 } 1430 if (dev->txq.qlen < TX_QLEN (dev)) 1431 netif_wake_queue (dev->net); 1432 } 1433 } 1434 1435 1436 /*------------------------------------------------------------------------- 1437 * 1438 * USB Device Driver support 1439 * 1440 *-------------------------------------------------------------------------*/ 1441 1442 // precondition: never called in_interrupt 1443 1444 void usbnet_disconnect (struct usb_interface *intf) 1445 { 1446 struct usbnet *dev; 1447 struct usb_device *xdev; 1448 struct net_device *net; 1449 1450 dev = usb_get_intfdata(intf); 1451 usb_set_intfdata(intf, NULL); 1452 if (!dev) 1453 return; 1454 1455 xdev = interface_to_usbdev (intf); 1456 1457 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", 1458 intf->dev.driver->name, 1459 xdev->bus->bus_name, xdev->devpath, 1460 dev->driver_info->description); 1461 1462 net = dev->net; 1463 unregister_netdev (net); 1464 1465 cancel_work_sync(&dev->kevent); 1466 1467 usb_scuttle_anchored_urbs(&dev->deferred); 1468 1469 if (dev->driver_info->unbind) 1470 dev->driver_info->unbind (dev, intf); 1471 1472 usb_kill_urb(dev->interrupt); 1473 usb_free_urb(dev->interrupt); 1474 1475 free_netdev(net); 1476 } 1477 EXPORT_SYMBOL_GPL(usbnet_disconnect); 1478 1479 static const struct net_device_ops usbnet_netdev_ops = { 1480 .ndo_open = usbnet_open, 1481 .ndo_stop = usbnet_stop, 1482 .ndo_start_xmit = usbnet_start_xmit, 1483 .ndo_tx_timeout = usbnet_tx_timeout, 1484 .ndo_change_mtu = usbnet_change_mtu, 1485 .ndo_set_mac_address = eth_mac_addr, 1486 .ndo_validate_addr = eth_validate_addr, 1487 }; 1488 1489 /*-------------------------------------------------------------------------*/ 1490 1491 // precondition: never called in_interrupt 1492 1493 static struct device_type wlan_type = { 1494 .name = "wlan", 1495 }; 1496 1497 static struct device_type wwan_type = { 1498 .name = "wwan", 1499 }; 1500 1501 int 1502 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) 1503 { 1504 struct usbnet *dev; 1505 struct net_device *net; 1506 struct usb_host_interface *interface; 1507 struct driver_info *info; 1508 struct usb_device *xdev; 1509 int status; 1510 const char *name; 1511 struct usb_driver *driver = to_usb_driver(udev->dev.driver); 1512 1513 /* usbnet already took usb runtime pm, so have to enable the feature 1514 * for usb interface, otherwise usb_autopm_get_interface may return 1515 * failure if RUNTIME_PM is enabled. 1516 */ 1517 if (!driver->supports_autosuspend) { 1518 driver->supports_autosuspend = 1; 1519 pm_runtime_enable(&udev->dev); 1520 } 1521 1522 name = udev->dev.driver->name; 1523 info = (struct driver_info *) prod->driver_info; 1524 if (!info) { 1525 dev_dbg (&udev->dev, "blacklisted by %s\n", name); 1526 return -ENODEV; 1527 } 1528 xdev = interface_to_usbdev (udev); 1529 interface = udev->cur_altsetting; 1530 1531 status = -ENOMEM; 1532 1533 // set up our own records 1534 net = alloc_etherdev(sizeof(*dev)); 1535 if (!net) 1536 goto out; 1537 1538 /* netdev_printk() needs this so do it as early as possible */ 1539 SET_NETDEV_DEV(net, &udev->dev); 1540 1541 dev = netdev_priv(net); 1542 dev->udev = xdev; 1543 dev->intf = udev; 1544 dev->driver_info = info; 1545 dev->driver_name = name; 1546 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV 1547 | NETIF_MSG_PROBE | NETIF_MSG_LINK); 1548 skb_queue_head_init (&dev->rxq); 1549 skb_queue_head_init (&dev->txq); 1550 skb_queue_head_init (&dev->done); 1551 skb_queue_head_init(&dev->rxq_pause); 1552 dev->bh.func = usbnet_bh; 1553 dev->bh.data = (unsigned long) dev; 1554 INIT_WORK (&dev->kevent, kevent); 1555 init_usb_anchor(&dev->deferred); 1556 dev->delay.function = usbnet_bh; 1557 dev->delay.data = (unsigned long) dev; 1558 init_timer (&dev->delay); 1559 mutex_init (&dev->phy_mutex); 1560 mutex_init(&dev->interrupt_mutex); 1561 dev->interrupt_count = 0; 1562 1563 dev->net = net; 1564 strcpy (net->name, "usb%d"); 1565 memcpy (net->dev_addr, node_id, sizeof node_id); 1566 1567 /* rx and tx sides can use different message sizes; 1568 * bind() should set rx_urb_size in that case. 1569 */ 1570 dev->hard_mtu = net->mtu + net->hard_header_len; 1571 #if 0 1572 // dma_supported() is deeply broken on almost all architectures 1573 // possible with some EHCI controllers 1574 if (dma_supported (&udev->dev, DMA_BIT_MASK(64))) 1575 net->features |= NETIF_F_HIGHDMA; 1576 #endif 1577 1578 net->netdev_ops = &usbnet_netdev_ops; 1579 net->watchdog_timeo = TX_TIMEOUT_JIFFIES; 1580 net->ethtool_ops = &usbnet_ethtool_ops; 1581 1582 // allow device-specific bind/init procedures 1583 // NOTE net->name still not usable ... 1584 if (info->bind) { 1585 status = info->bind (dev, udev); 1586 if (status < 0) 1587 goto out1; 1588 1589 // heuristic: "usb%d" for links we know are two-host, 1590 // else "eth%d" when there's reasonable doubt. userspace 1591 // can rename the link if it knows better. 1592 if ((dev->driver_info->flags & FLAG_ETHER) != 0 && 1593 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 || 1594 (net->dev_addr [0] & 0x02) == 0)) 1595 strcpy (net->name, "eth%d"); 1596 /* WLAN devices should always be named "wlan%d" */ 1597 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1598 strcpy(net->name, "wlan%d"); 1599 /* WWAN devices should always be named "wwan%d" */ 1600 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1601 strcpy(net->name, "wwan%d"); 1602 1603 /* devices that cannot do ARP */ 1604 if ((dev->driver_info->flags & FLAG_NOARP) != 0) 1605 net->flags |= IFF_NOARP; 1606 1607 /* maybe the remote can't receive an Ethernet MTU */ 1608 if (net->mtu > (dev->hard_mtu - net->hard_header_len)) 1609 net->mtu = dev->hard_mtu - net->hard_header_len; 1610 } else if (!info->in || !info->out) 1611 status = usbnet_get_endpoints (dev, udev); 1612 else { 1613 dev->in = usb_rcvbulkpipe (xdev, info->in); 1614 dev->out = usb_sndbulkpipe (xdev, info->out); 1615 if (!(info->flags & FLAG_NO_SETINT)) 1616 status = usb_set_interface (xdev, 1617 interface->desc.bInterfaceNumber, 1618 interface->desc.bAlternateSetting); 1619 else 1620 status = 0; 1621 1622 } 1623 if (status >= 0 && dev->status) 1624 status = init_status (dev, udev); 1625 if (status < 0) 1626 goto out3; 1627 1628 if (!dev->rx_urb_size) 1629 dev->rx_urb_size = dev->hard_mtu; 1630 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); 1631 1632 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1633 SET_NETDEV_DEVTYPE(net, &wlan_type); 1634 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1635 SET_NETDEV_DEVTYPE(net, &wwan_type); 1636 1637 /* initialize max rx_qlen and tx_qlen */ 1638 usbnet_update_max_qlen(dev); 1639 1640 status = register_netdev (net); 1641 if (status) 1642 goto out4; 1643 netif_info(dev, probe, dev->net, 1644 "register '%s' at usb-%s-%s, %s, %pM\n", 1645 udev->dev.driver->name, 1646 xdev->bus->bus_name, xdev->devpath, 1647 dev->driver_info->description, 1648 net->dev_addr); 1649 1650 // ok, it's ready to go. 1651 usb_set_intfdata (udev, dev); 1652 1653 netif_device_attach (net); 1654 1655 if (dev->driver_info->flags & FLAG_LINK_INTR) 1656 usbnet_link_change(dev, 0, 0); 1657 1658 return 0; 1659 1660 out4: 1661 usb_free_urb(dev->interrupt); 1662 out3: 1663 if (info->unbind) 1664 info->unbind (dev, udev); 1665 out1: 1666 free_netdev(net); 1667 out: 1668 return status; 1669 } 1670 EXPORT_SYMBOL_GPL(usbnet_probe); 1671 1672 /*-------------------------------------------------------------------------*/ 1673 1674 /* 1675 * suspend the whole driver as soon as the first interface is suspended 1676 * resume only when the last interface is resumed 1677 */ 1678 1679 int usbnet_suspend (struct usb_interface *intf, pm_message_t message) 1680 { 1681 struct usbnet *dev = usb_get_intfdata(intf); 1682 1683 if (!dev->suspend_count++) { 1684 spin_lock_irq(&dev->txq.lock); 1685 /* don't autosuspend while transmitting */ 1686 if (dev->txq.qlen && PMSG_IS_AUTO(message)) { 1687 dev->suspend_count--; 1688 spin_unlock_irq(&dev->txq.lock); 1689 return -EBUSY; 1690 } else { 1691 set_bit(EVENT_DEV_ASLEEP, &dev->flags); 1692 spin_unlock_irq(&dev->txq.lock); 1693 } 1694 /* 1695 * accelerate emptying of the rx and queues, to avoid 1696 * having everything error out. 1697 */ 1698 netif_device_detach (dev->net); 1699 usbnet_terminate_urbs(dev); 1700 __usbnet_status_stop_force(dev); 1701 1702 /* 1703 * reattach so runtime management can use and 1704 * wake the device 1705 */ 1706 netif_device_attach (dev->net); 1707 } 1708 return 0; 1709 } 1710 EXPORT_SYMBOL_GPL(usbnet_suspend); 1711 1712 int usbnet_resume (struct usb_interface *intf) 1713 { 1714 struct usbnet *dev = usb_get_intfdata(intf); 1715 struct sk_buff *skb; 1716 struct urb *res; 1717 int retval; 1718 1719 if (!--dev->suspend_count) { 1720 /* resume interrupt URB if it was previously submitted */ 1721 __usbnet_status_start_force(dev, GFP_NOIO); 1722 1723 spin_lock_irq(&dev->txq.lock); 1724 while ((res = usb_get_from_anchor(&dev->deferred))) { 1725 1726 skb = (struct sk_buff *)res->context; 1727 retval = usb_submit_urb(res, GFP_ATOMIC); 1728 if (retval < 0) { 1729 dev_kfree_skb_any(skb); 1730 usb_free_urb(res); 1731 usb_autopm_put_interface_async(dev->intf); 1732 } else { 1733 dev->net->trans_start = jiffies; 1734 __skb_queue_tail(&dev->txq, skb); 1735 } 1736 } 1737 1738 smp_mb(); 1739 clear_bit(EVENT_DEV_ASLEEP, &dev->flags); 1740 spin_unlock_irq(&dev->txq.lock); 1741 1742 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) { 1743 /* handle remote wakeup ASAP */ 1744 if (!dev->wait && 1745 netif_device_present(dev->net) && 1746 !timer_pending(&dev->delay) && 1747 !test_bit(EVENT_RX_HALT, &dev->flags)) 1748 rx_alloc_submit(dev, GFP_NOIO); 1749 1750 if (!(dev->txq.qlen >= TX_QLEN(dev))) 1751 netif_tx_wake_all_queues(dev->net); 1752 tasklet_schedule (&dev->bh); 1753 } 1754 } 1755 1756 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) 1757 usb_autopm_get_interface_no_resume(intf); 1758 1759 return 0; 1760 } 1761 EXPORT_SYMBOL_GPL(usbnet_resume); 1762 1763 /* 1764 * Either a subdriver implements manage_power, then it is assumed to always 1765 * be ready to be suspended or it reports the readiness to be suspended 1766 * explicitly 1767 */ 1768 void usbnet_device_suggests_idle(struct usbnet *dev) 1769 { 1770 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) { 1771 dev->intf->needs_remote_wakeup = 1; 1772 usb_autopm_put_interface_async(dev->intf); 1773 } 1774 } 1775 EXPORT_SYMBOL(usbnet_device_suggests_idle); 1776 1777 /* 1778 * For devices that can do without special commands 1779 */ 1780 int usbnet_manage_power(struct usbnet *dev, int on) 1781 { 1782 dev->intf->needs_remote_wakeup = on; 1783 return 0; 1784 } 1785 EXPORT_SYMBOL(usbnet_manage_power); 1786 1787 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset) 1788 { 1789 /* update link after link is reseted */ 1790 if (link && !need_reset) 1791 netif_carrier_on(dev->net); 1792 else 1793 netif_carrier_off(dev->net); 1794 1795 if (need_reset && link) 1796 usbnet_defer_kevent(dev, EVENT_LINK_RESET); 1797 else 1798 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE); 1799 } 1800 EXPORT_SYMBOL(usbnet_link_change); 1801 1802 /*-------------------------------------------------------------------------*/ 1803 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1804 u16 value, u16 index, void *data, u16 size) 1805 { 1806 void *buf = NULL; 1807 int err = -ENOMEM; 1808 1809 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x" 1810 " value=0x%04x index=0x%04x size=%d\n", 1811 cmd, reqtype, value, index, size); 1812 1813 if (data) { 1814 buf = kmalloc(size, GFP_KERNEL); 1815 if (!buf) 1816 goto out; 1817 } 1818 1819 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), 1820 cmd, reqtype, value, index, buf, size, 1821 USB_CTRL_GET_TIMEOUT); 1822 if (err > 0 && err <= size) 1823 memcpy(data, buf, err); 1824 kfree(buf); 1825 out: 1826 return err; 1827 } 1828 1829 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1830 u16 value, u16 index, const void *data, 1831 u16 size) 1832 { 1833 void *buf = NULL; 1834 int err = -ENOMEM; 1835 1836 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 1837 " value=0x%04x index=0x%04x size=%d\n", 1838 cmd, reqtype, value, index, size); 1839 1840 if (data) { 1841 buf = kmemdup(data, size, GFP_KERNEL); 1842 if (!buf) 1843 goto out; 1844 } 1845 1846 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), 1847 cmd, reqtype, value, index, buf, size, 1848 USB_CTRL_SET_TIMEOUT); 1849 kfree(buf); 1850 1851 out: 1852 return err; 1853 } 1854 1855 /* 1856 * The function can't be called inside suspend/resume callback, 1857 * otherwise deadlock will be caused. 1858 */ 1859 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1860 u16 value, u16 index, void *data, u16 size) 1861 { 1862 int ret; 1863 1864 if (usb_autopm_get_interface(dev->intf) < 0) 1865 return -ENODEV; 1866 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index, 1867 data, size); 1868 usb_autopm_put_interface(dev->intf); 1869 return ret; 1870 } 1871 EXPORT_SYMBOL_GPL(usbnet_read_cmd); 1872 1873 /* 1874 * The function can't be called inside suspend/resume callback, 1875 * otherwise deadlock will be caused. 1876 */ 1877 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1878 u16 value, u16 index, const void *data, u16 size) 1879 { 1880 int ret; 1881 1882 if (usb_autopm_get_interface(dev->intf) < 0) 1883 return -ENODEV; 1884 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index, 1885 data, size); 1886 usb_autopm_put_interface(dev->intf); 1887 return ret; 1888 } 1889 EXPORT_SYMBOL_GPL(usbnet_write_cmd); 1890 1891 /* 1892 * The function can be called inside suspend/resume callback safely 1893 * and should only be called by suspend/resume callback generally. 1894 */ 1895 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 1896 u16 value, u16 index, void *data, u16 size) 1897 { 1898 return __usbnet_read_cmd(dev, cmd, reqtype, value, index, 1899 data, size); 1900 } 1901 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm); 1902 1903 /* 1904 * The function can be called inside suspend/resume callback safely 1905 * and should only be called by suspend/resume callback generally. 1906 */ 1907 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 1908 u16 value, u16 index, const void *data, 1909 u16 size) 1910 { 1911 return __usbnet_write_cmd(dev, cmd, reqtype, value, index, 1912 data, size); 1913 } 1914 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm); 1915 1916 static void usbnet_async_cmd_cb(struct urb *urb) 1917 { 1918 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context; 1919 int status = urb->status; 1920 1921 if (status < 0) 1922 dev_dbg(&urb->dev->dev, "%s failed with %d", 1923 __func__, status); 1924 1925 kfree(req); 1926 usb_free_urb(urb); 1927 } 1928 1929 /* 1930 * The caller must make sure that device can't be put into suspend 1931 * state until the control URB completes. 1932 */ 1933 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype, 1934 u16 value, u16 index, const void *data, u16 size) 1935 { 1936 struct usb_ctrlrequest *req = NULL; 1937 struct urb *urb; 1938 int err = -ENOMEM; 1939 void *buf = NULL; 1940 1941 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 1942 " value=0x%04x index=0x%04x size=%d\n", 1943 cmd, reqtype, value, index, size); 1944 1945 urb = usb_alloc_urb(0, GFP_ATOMIC); 1946 if (!urb) { 1947 netdev_err(dev->net, "Error allocating URB in" 1948 " %s!\n", __func__); 1949 goto fail; 1950 } 1951 1952 if (data) { 1953 buf = kmemdup(data, size, GFP_ATOMIC); 1954 if (!buf) { 1955 netdev_err(dev->net, "Error allocating buffer" 1956 " in %s!\n", __func__); 1957 goto fail_free; 1958 } 1959 } 1960 1961 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC); 1962 if (!req) 1963 goto fail_free_buf; 1964 1965 req->bRequestType = reqtype; 1966 req->bRequest = cmd; 1967 req->wValue = cpu_to_le16(value); 1968 req->wIndex = cpu_to_le16(index); 1969 req->wLength = cpu_to_le16(size); 1970 1971 usb_fill_control_urb(urb, dev->udev, 1972 usb_sndctrlpipe(dev->udev, 0), 1973 (void *)req, buf, size, 1974 usbnet_async_cmd_cb, req); 1975 urb->transfer_flags |= URB_FREE_BUFFER; 1976 1977 err = usb_submit_urb(urb, GFP_ATOMIC); 1978 if (err < 0) { 1979 netdev_err(dev->net, "Error submitting the control" 1980 " message: status=%d\n", err); 1981 goto fail_free; 1982 } 1983 return 0; 1984 1985 fail_free_buf: 1986 kfree(buf); 1987 fail_free: 1988 kfree(req); 1989 usb_free_urb(urb); 1990 fail: 1991 return err; 1992 1993 } 1994 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async); 1995 /*-------------------------------------------------------------------------*/ 1996 1997 static int __init usbnet_init(void) 1998 { 1999 /* Compiler should optimize this out. */ 2000 BUILD_BUG_ON( 2001 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data)); 2002 2003 eth_random_addr(node_id); 2004 return 0; 2005 } 2006 module_init(usbnet_init); 2007 2008 static void __exit usbnet_exit(void) 2009 { 2010 } 2011 module_exit(usbnet_exit); 2012 2013 MODULE_AUTHOR("David Brownell"); 2014 MODULE_DESCRIPTION("USB network driver framework"); 2015 MODULE_LICENSE("GPL"); 2016