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, see <http://www.gnu.org/licenses/>. 18 */ 19 20 /* 21 * This is a generic "USB networking" framework that works with several 22 * kinds of full and high speed networking devices: host-to-host cables, 23 * smart usb peripherals, and actual Ethernet adapters. 24 * 25 * These devices usually differ in terms of control protocols (if they 26 * even have one!) and sometimes they define new framing to wrap or batch 27 * Ethernet packets. Otherwise, they talk to USB pretty much the same, 28 * so interface (un)binding, endpoint I/O queues, fault handling, and other 29 * issues can usefully be addressed by this framework. 30 */ 31 32 // #define DEBUG // error path messages, extra info 33 // #define VERBOSE // more; success messages 34 35 #include <linux/module.h> 36 #include <linux/init.h> 37 #include <linux/netdevice.h> 38 #include <linux/etherdevice.h> 39 #include <linux/ctype.h> 40 #include <linux/ethtool.h> 41 #include <linux/workqueue.h> 42 #include <linux/mii.h> 43 #include <linux/usb.h> 44 #include <linux/usb/usbnet.h> 45 #include <linux/slab.h> 46 #include <linux/kernel.h> 47 #include <linux/pm_runtime.h> 48 49 #define DRIVER_VERSION "22-Aug-2005" 50 51 52 /*-------------------------------------------------------------------------*/ 53 54 /* 55 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max. 56 * Several dozen bytes of IPv4 data can fit in two such transactions. 57 * One maximum size Ethernet packet takes twenty four of them. 58 * For high speed, each frame comfortably fits almost 36 max size 59 * Ethernet packets (so queues should be bigger). 60 * 61 * The goal is to let the USB host controller be busy for 5msec or 62 * more before an irq is required, under load. Jumbograms change 63 * the equation. 64 */ 65 #define MAX_QUEUE_MEMORY (60 * 1518) 66 #define RX_QLEN(dev) ((dev)->rx_qlen) 67 #define TX_QLEN(dev) ((dev)->tx_qlen) 68 69 // reawaken network queue this soon after stopping; else watchdog barks 70 #define TX_TIMEOUT_JIFFIES (5*HZ) 71 72 /* throttle rx/tx briefly after some faults, so hub_wq might disconnect() 73 * us (it polls at HZ/4 usually) before we report too many false errors. 74 */ 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 status = usb_submit_urb (urb, GFP_ATOMIC); 208 if (status != 0) 209 netif_err(dev, timer, dev->net, 210 "intr resubmit --> %d\n", status); 211 } 212 213 static int init_status (struct usbnet *dev, struct usb_interface *intf) 214 { 215 char *buf = NULL; 216 unsigned pipe = 0; 217 unsigned maxp; 218 unsigned period; 219 220 if (!dev->driver_info->status) 221 return 0; 222 223 pipe = usb_rcvintpipe (dev->udev, 224 dev->status->desc.bEndpointAddress 225 & USB_ENDPOINT_NUMBER_MASK); 226 maxp = usb_maxpacket (dev->udev, pipe, 0); 227 228 /* avoid 1 msec chatter: min 8 msec poll rate */ 229 period = max ((int) dev->status->desc.bInterval, 230 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3); 231 232 buf = kmalloc (maxp, GFP_KERNEL); 233 if (buf) { 234 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL); 235 if (!dev->interrupt) { 236 kfree (buf); 237 return -ENOMEM; 238 } else { 239 usb_fill_int_urb(dev->interrupt, dev->udev, pipe, 240 buf, maxp, intr_complete, dev, period); 241 dev->interrupt->transfer_flags |= URB_FREE_BUFFER; 242 dev_dbg(&intf->dev, 243 "status ep%din, %d bytes period %d\n", 244 usb_pipeendpoint(pipe), maxp, period); 245 } 246 } 247 return 0; 248 } 249 250 /* Submit the interrupt URB if not previously submitted, increasing refcount */ 251 int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags) 252 { 253 int ret = 0; 254 255 WARN_ON_ONCE(dev->interrupt == NULL); 256 if (dev->interrupt) { 257 mutex_lock(&dev->interrupt_mutex); 258 259 if (++dev->interrupt_count == 1) 260 ret = usb_submit_urb(dev->interrupt, mem_flags); 261 262 dev_dbg(&dev->udev->dev, "incremented interrupt URB count to %d\n", 263 dev->interrupt_count); 264 mutex_unlock(&dev->interrupt_mutex); 265 } 266 return ret; 267 } 268 EXPORT_SYMBOL_GPL(usbnet_status_start); 269 270 /* For resume; submit interrupt URB if previously submitted */ 271 static int __usbnet_status_start_force(struct usbnet *dev, gfp_t mem_flags) 272 { 273 int ret = 0; 274 275 mutex_lock(&dev->interrupt_mutex); 276 if (dev->interrupt_count) { 277 ret = usb_submit_urb(dev->interrupt, mem_flags); 278 dev_dbg(&dev->udev->dev, 279 "submitted interrupt URB for resume\n"); 280 } 281 mutex_unlock(&dev->interrupt_mutex); 282 return ret; 283 } 284 285 /* Kill the interrupt URB if all submitters want it killed */ 286 void usbnet_status_stop(struct usbnet *dev) 287 { 288 if (dev->interrupt) { 289 mutex_lock(&dev->interrupt_mutex); 290 WARN_ON(dev->interrupt_count == 0); 291 292 if (dev->interrupt_count && --dev->interrupt_count == 0) 293 usb_kill_urb(dev->interrupt); 294 295 dev_dbg(&dev->udev->dev, 296 "decremented interrupt URB count to %d\n", 297 dev->interrupt_count); 298 mutex_unlock(&dev->interrupt_mutex); 299 } 300 } 301 EXPORT_SYMBOL_GPL(usbnet_status_stop); 302 303 /* For suspend; always kill interrupt URB */ 304 static void __usbnet_status_stop_force(struct usbnet *dev) 305 { 306 if (dev->interrupt) { 307 mutex_lock(&dev->interrupt_mutex); 308 usb_kill_urb(dev->interrupt); 309 dev_dbg(&dev->udev->dev, "killed interrupt URB for suspend\n"); 310 mutex_unlock(&dev->interrupt_mutex); 311 } 312 } 313 314 /* Passes this packet up the stack, updating its accounting. 315 * Some link protocols batch packets, so their rx_fixup paths 316 * can return clones as well as just modify the original skb. 317 */ 318 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb) 319 { 320 int status; 321 322 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) { 323 skb_queue_tail(&dev->rxq_pause, skb); 324 return; 325 } 326 327 skb->protocol = eth_type_trans (skb, dev->net); 328 dev->net->stats.rx_packets++; 329 dev->net->stats.rx_bytes += skb->len; 330 331 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n", 332 skb->len + sizeof (struct ethhdr), skb->protocol); 333 memset (skb->cb, 0, sizeof (struct skb_data)); 334 335 if (skb_defer_rx_timestamp(skb)) 336 return; 337 338 status = netif_rx (skb); 339 if (status != NET_RX_SUCCESS) 340 netif_dbg(dev, rx_err, dev->net, 341 "netif_rx status %d\n", status); 342 } 343 EXPORT_SYMBOL_GPL(usbnet_skb_return); 344 345 /* must be called if hard_mtu or rx_urb_size changed */ 346 void usbnet_update_max_qlen(struct usbnet *dev) 347 { 348 enum usb_device_speed speed = dev->udev->speed; 349 350 switch (speed) { 351 case USB_SPEED_HIGH: 352 dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size; 353 dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu; 354 break; 355 case USB_SPEED_SUPER: 356 /* 357 * Not take default 5ms qlen for super speed HC to 358 * save memory, and iperf tests show 2.5ms qlen can 359 * work well 360 */ 361 dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size; 362 dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu; 363 break; 364 default: 365 dev->rx_qlen = dev->tx_qlen = 4; 366 } 367 } 368 EXPORT_SYMBOL_GPL(usbnet_update_max_qlen); 369 370 371 /*------------------------------------------------------------------------- 372 * 373 * Network Device Driver (peer link to "Host Device", from USB host) 374 * 375 *-------------------------------------------------------------------------*/ 376 377 int usbnet_change_mtu (struct net_device *net, int new_mtu) 378 { 379 struct usbnet *dev = netdev_priv(net); 380 int ll_mtu = new_mtu + net->hard_header_len; 381 int old_hard_mtu = dev->hard_mtu; 382 int old_rx_urb_size = dev->rx_urb_size; 383 384 if (new_mtu <= 0) 385 return -EINVAL; 386 // no second zero-length packet read wanted after mtu-sized packets 387 if ((ll_mtu % dev->maxpacket) == 0) 388 return -EDOM; 389 net->mtu = new_mtu; 390 391 dev->hard_mtu = net->mtu + net->hard_header_len; 392 if (dev->rx_urb_size == old_hard_mtu) { 393 dev->rx_urb_size = dev->hard_mtu; 394 if (dev->rx_urb_size > old_rx_urb_size) 395 usbnet_unlink_rx_urbs(dev); 396 } 397 398 /* max qlen depend on hard_mtu and rx_urb_size */ 399 usbnet_update_max_qlen(dev); 400 401 return 0; 402 } 403 EXPORT_SYMBOL_GPL(usbnet_change_mtu); 404 405 /* The caller must hold list->lock */ 406 static void __usbnet_queue_skb(struct sk_buff_head *list, 407 struct sk_buff *newsk, enum skb_state state) 408 { 409 struct skb_data *entry = (struct skb_data *) newsk->cb; 410 411 __skb_queue_tail(list, newsk); 412 entry->state = state; 413 } 414 415 /*-------------------------------------------------------------------------*/ 416 417 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from 418 * completion callbacks. 2.5 should have fixed those bugs... 419 */ 420 421 static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb, 422 struct sk_buff_head *list, enum skb_state state) 423 { 424 unsigned long flags; 425 enum skb_state old_state; 426 struct skb_data *entry = (struct skb_data *) skb->cb; 427 428 spin_lock_irqsave(&list->lock, flags); 429 old_state = entry->state; 430 entry->state = state; 431 __skb_unlink(skb, list); 432 spin_unlock(&list->lock); 433 spin_lock(&dev->done.lock); 434 __skb_queue_tail(&dev->done, skb); 435 if (dev->done.qlen == 1) 436 tasklet_schedule(&dev->bh); 437 spin_unlock_irqrestore(&dev->done.lock, flags); 438 return old_state; 439 } 440 441 /* some work can't be done in tasklets, so we use keventd 442 * 443 * NOTE: annoying asymmetry: if it's active, schedule_work() fails, 444 * but tasklet_schedule() doesn't. hope the failure is rare. 445 */ 446 void usbnet_defer_kevent (struct usbnet *dev, int work) 447 { 448 set_bit (work, &dev->flags); 449 if (!schedule_work (&dev->kevent)) { 450 if (net_ratelimit()) 451 netdev_err(dev->net, "kevent %d may have been dropped\n", work); 452 } else { 453 netdev_dbg(dev->net, "kevent %d scheduled\n", work); 454 } 455 } 456 EXPORT_SYMBOL_GPL(usbnet_defer_kevent); 457 458 /*-------------------------------------------------------------------------*/ 459 460 static void rx_complete (struct urb *urb); 461 462 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) 463 { 464 struct sk_buff *skb; 465 struct skb_data *entry; 466 int retval = 0; 467 unsigned long lockflags; 468 size_t size = dev->rx_urb_size; 469 470 /* prevent rx skb allocation when error ratio is high */ 471 if (test_bit(EVENT_RX_KILL, &dev->flags)) { 472 usb_free_urb(urb); 473 return -ENOLINK; 474 } 475 476 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags); 477 if (!skb) { 478 netif_dbg(dev, rx_err, dev->net, "no rx skb\n"); 479 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 480 usb_free_urb (urb); 481 return -ENOMEM; 482 } 483 484 entry = (struct skb_data *) skb->cb; 485 entry->urb = urb; 486 entry->dev = dev; 487 entry->length = 0; 488 489 usb_fill_bulk_urb (urb, dev->udev, dev->in, 490 skb->data, size, rx_complete, skb); 491 492 spin_lock_irqsave (&dev->rxq.lock, lockflags); 493 494 if (netif_running (dev->net) && 495 netif_device_present (dev->net) && 496 !test_bit (EVENT_RX_HALT, &dev->flags) && 497 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) { 498 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) { 499 case -EPIPE: 500 usbnet_defer_kevent (dev, EVENT_RX_HALT); 501 break; 502 case -ENOMEM: 503 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 504 break; 505 case -ENODEV: 506 netif_dbg(dev, ifdown, dev->net, "device gone\n"); 507 netif_device_detach (dev->net); 508 break; 509 case -EHOSTUNREACH: 510 retval = -ENOLINK; 511 break; 512 default: 513 netif_dbg(dev, rx_err, dev->net, 514 "rx submit, %d\n", retval); 515 tasklet_schedule (&dev->bh); 516 break; 517 case 0: 518 __usbnet_queue_skb(&dev->rxq, skb, rx_start); 519 } 520 } else { 521 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n"); 522 retval = -ENOLINK; 523 } 524 spin_unlock_irqrestore (&dev->rxq.lock, lockflags); 525 if (retval) { 526 dev_kfree_skb_any (skb); 527 usb_free_urb (urb); 528 } 529 return retval; 530 } 531 532 533 /*-------------------------------------------------------------------------*/ 534 535 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb) 536 { 537 if (dev->driver_info->rx_fixup && 538 !dev->driver_info->rx_fixup (dev, skb)) { 539 /* With RX_ASSEMBLE, rx_fixup() must update counters */ 540 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE)) 541 dev->net->stats.rx_errors++; 542 goto done; 543 } 544 // else network stack removes extra byte if we forced a short packet 545 546 /* all data was already cloned from skb inside the driver */ 547 if (dev->driver_info->flags & FLAG_MULTI_PACKET) 548 goto done; 549 550 if (skb->len < ETH_HLEN) { 551 dev->net->stats.rx_errors++; 552 dev->net->stats.rx_length_errors++; 553 netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len); 554 } else { 555 usbnet_skb_return(dev, skb); 556 return; 557 } 558 559 done: 560 skb_queue_tail(&dev->done, skb); 561 } 562 563 /*-------------------------------------------------------------------------*/ 564 565 static void rx_complete (struct urb *urb) 566 { 567 struct sk_buff *skb = (struct sk_buff *) urb->context; 568 struct skb_data *entry = (struct skb_data *) skb->cb; 569 struct usbnet *dev = entry->dev; 570 int urb_status = urb->status; 571 enum skb_state state; 572 573 skb_put (skb, urb->actual_length); 574 state = rx_done; 575 entry->urb = NULL; 576 577 switch (urb_status) { 578 /* success */ 579 case 0: 580 break; 581 582 /* stalls need manual reset. this is rare ... except that 583 * when going through USB 2.0 TTs, unplug appears this way. 584 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ 585 * storm, recovering as needed. 586 */ 587 case -EPIPE: 588 dev->net->stats.rx_errors++; 589 usbnet_defer_kevent (dev, EVENT_RX_HALT); 590 // FALLTHROUGH 591 592 /* software-driven interface shutdown */ 593 case -ECONNRESET: /* async unlink */ 594 case -ESHUTDOWN: /* hardware gone */ 595 netif_dbg(dev, ifdown, dev->net, 596 "rx shutdown, code %d\n", urb_status); 597 goto block; 598 599 /* we get controller i/o faults during hub_wq disconnect() delays. 600 * throttle down resubmits, to avoid log floods; just temporarily, 601 * so we still recover when the fault isn't a hub_wq delay. 602 */ 603 case -EPROTO: 604 case -ETIME: 605 case -EILSEQ: 606 dev->net->stats.rx_errors++; 607 if (!timer_pending (&dev->delay)) { 608 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); 609 netif_dbg(dev, link, dev->net, 610 "rx throttle %d\n", urb_status); 611 } 612 block: 613 state = rx_cleanup; 614 entry->urb = urb; 615 urb = NULL; 616 break; 617 618 /* data overrun ... flush fifo? */ 619 case -EOVERFLOW: 620 dev->net->stats.rx_over_errors++; 621 // FALLTHROUGH 622 623 default: 624 state = rx_cleanup; 625 dev->net->stats.rx_errors++; 626 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status); 627 break; 628 } 629 630 /* stop rx if packet error rate is high */ 631 if (++dev->pkt_cnt > 30) { 632 dev->pkt_cnt = 0; 633 dev->pkt_err = 0; 634 } else { 635 if (state == rx_cleanup) 636 dev->pkt_err++; 637 if (dev->pkt_err > 20) 638 set_bit(EVENT_RX_KILL, &dev->flags); 639 } 640 641 state = defer_bh(dev, skb, &dev->rxq, state); 642 643 if (urb) { 644 if (netif_running (dev->net) && 645 !test_bit (EVENT_RX_HALT, &dev->flags) && 646 state != unlink_start) { 647 rx_submit (dev, urb, GFP_ATOMIC); 648 usb_mark_last_busy(dev->udev); 649 return; 650 } 651 usb_free_urb (urb); 652 } 653 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n"); 654 } 655 656 /*-------------------------------------------------------------------------*/ 657 void usbnet_pause_rx(struct usbnet *dev) 658 { 659 set_bit(EVENT_RX_PAUSED, &dev->flags); 660 661 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n"); 662 } 663 EXPORT_SYMBOL_GPL(usbnet_pause_rx); 664 665 void usbnet_resume_rx(struct usbnet *dev) 666 { 667 struct sk_buff *skb; 668 int num = 0; 669 670 clear_bit(EVENT_RX_PAUSED, &dev->flags); 671 672 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) { 673 usbnet_skb_return(dev, skb); 674 num++; 675 } 676 677 tasklet_schedule(&dev->bh); 678 679 netif_dbg(dev, rx_status, dev->net, 680 "paused rx queue disabled, %d skbs requeued\n", num); 681 } 682 EXPORT_SYMBOL_GPL(usbnet_resume_rx); 683 684 void usbnet_purge_paused_rxq(struct usbnet *dev) 685 { 686 skb_queue_purge(&dev->rxq_pause); 687 } 688 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq); 689 690 /*-------------------------------------------------------------------------*/ 691 692 // unlink pending rx/tx; completion handlers do all other cleanup 693 694 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) 695 { 696 unsigned long flags; 697 struct sk_buff *skb; 698 int count = 0; 699 700 spin_lock_irqsave (&q->lock, flags); 701 while (!skb_queue_empty(q)) { 702 struct skb_data *entry; 703 struct urb *urb; 704 int retval; 705 706 skb_queue_walk(q, skb) { 707 entry = (struct skb_data *) skb->cb; 708 if (entry->state != unlink_start) 709 goto found; 710 } 711 break; 712 found: 713 entry->state = unlink_start; 714 urb = entry->urb; 715 716 /* 717 * Get reference count of the URB to avoid it to be 718 * freed during usb_unlink_urb, which may trigger 719 * use-after-free problem inside usb_unlink_urb since 720 * usb_unlink_urb is always racing with .complete 721 * handler(include defer_bh). 722 */ 723 usb_get_urb(urb); 724 spin_unlock_irqrestore(&q->lock, flags); 725 // during some PM-driven resume scenarios, 726 // these (async) unlinks complete immediately 727 retval = usb_unlink_urb (urb); 728 if (retval != -EINPROGRESS && retval != 0) 729 netdev_dbg(dev->net, "unlink urb err, %d\n", retval); 730 else 731 count++; 732 usb_put_urb(urb); 733 spin_lock_irqsave(&q->lock, flags); 734 } 735 spin_unlock_irqrestore (&q->lock, flags); 736 return count; 737 } 738 739 // Flush all pending rx urbs 740 // minidrivers may need to do this when the MTU changes 741 742 void usbnet_unlink_rx_urbs(struct usbnet *dev) 743 { 744 if (netif_running(dev->net)) { 745 (void) unlink_urbs (dev, &dev->rxq); 746 tasklet_schedule(&dev->bh); 747 } 748 } 749 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); 750 751 /*-------------------------------------------------------------------------*/ 752 753 // precondition: never called in_interrupt 754 static void usbnet_terminate_urbs(struct usbnet *dev) 755 { 756 DECLARE_WAITQUEUE(wait, current); 757 int temp; 758 759 /* ensure there are no more active urbs */ 760 add_wait_queue(&dev->wait, &wait); 761 set_current_state(TASK_UNINTERRUPTIBLE); 762 temp = unlink_urbs(dev, &dev->txq) + 763 unlink_urbs(dev, &dev->rxq); 764 765 /* maybe wait for deletions to finish. */ 766 while (!skb_queue_empty(&dev->rxq) 767 && !skb_queue_empty(&dev->txq) 768 && !skb_queue_empty(&dev->done)) { 769 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS)); 770 set_current_state(TASK_UNINTERRUPTIBLE); 771 netif_dbg(dev, ifdown, dev->net, 772 "waited for %d urb completions\n", temp); 773 } 774 set_current_state(TASK_RUNNING); 775 remove_wait_queue(&dev->wait, &wait); 776 } 777 778 int usbnet_stop (struct net_device *net) 779 { 780 struct usbnet *dev = netdev_priv(net); 781 struct driver_info *info = dev->driver_info; 782 int retval, pm; 783 784 clear_bit(EVENT_DEV_OPEN, &dev->flags); 785 netif_stop_queue (net); 786 787 netif_info(dev, ifdown, dev->net, 788 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n", 789 net->stats.rx_packets, net->stats.tx_packets, 790 net->stats.rx_errors, net->stats.tx_errors); 791 792 /* to not race resume */ 793 pm = usb_autopm_get_interface(dev->intf); 794 /* allow minidriver to stop correctly (wireless devices to turn off 795 * radio etc) */ 796 if (info->stop) { 797 retval = info->stop(dev); 798 if (retval < 0) 799 netif_info(dev, ifdown, dev->net, 800 "stop fail (%d) usbnet usb-%s-%s, %s\n", 801 retval, 802 dev->udev->bus->bus_name, dev->udev->devpath, 803 info->description); 804 } 805 806 if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) 807 usbnet_terminate_urbs(dev); 808 809 usbnet_status_stop(dev); 810 811 usbnet_purge_paused_rxq(dev); 812 813 /* deferred work (task, timer, softirq) must also stop. 814 * can't flush_scheduled_work() until we drop rtnl (later), 815 * else workers could deadlock; so make workers a NOP. 816 */ 817 dev->flags = 0; 818 del_timer_sync (&dev->delay); 819 tasklet_kill (&dev->bh); 820 if (!pm) 821 usb_autopm_put_interface(dev->intf); 822 823 if (info->manage_power && 824 !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags)) 825 info->manage_power(dev, 0); 826 else 827 usb_autopm_put_interface(dev->intf); 828 829 return 0; 830 } 831 EXPORT_SYMBOL_GPL(usbnet_stop); 832 833 /*-------------------------------------------------------------------------*/ 834 835 // posts reads, and enables write queuing 836 837 // precondition: never called in_interrupt 838 839 int usbnet_open (struct net_device *net) 840 { 841 struct usbnet *dev = netdev_priv(net); 842 int retval; 843 struct driver_info *info = dev->driver_info; 844 845 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { 846 netif_info(dev, ifup, dev->net, 847 "resumption fail (%d) usbnet usb-%s-%s, %s\n", 848 retval, 849 dev->udev->bus->bus_name, 850 dev->udev->devpath, 851 info->description); 852 goto done_nopm; 853 } 854 855 // put into "known safe" state 856 if (info->reset && (retval = info->reset (dev)) < 0) { 857 netif_info(dev, ifup, dev->net, 858 "open reset fail (%d) usbnet usb-%s-%s, %s\n", 859 retval, 860 dev->udev->bus->bus_name, 861 dev->udev->devpath, 862 info->description); 863 goto done; 864 } 865 866 /* hard_mtu or rx_urb_size may change in reset() */ 867 usbnet_update_max_qlen(dev); 868 869 // insist peer be connected 870 if (info->check_connect && (retval = info->check_connect (dev)) < 0) { 871 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval); 872 goto done; 873 } 874 875 /* start any status interrupt transfer */ 876 if (dev->interrupt) { 877 retval = usbnet_status_start(dev, GFP_KERNEL); 878 if (retval < 0) { 879 netif_err(dev, ifup, dev->net, 880 "intr submit %d\n", retval); 881 goto done; 882 } 883 } 884 885 set_bit(EVENT_DEV_OPEN, &dev->flags); 886 netif_start_queue (net); 887 netif_info(dev, ifup, dev->net, 888 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n", 889 (int)RX_QLEN(dev), (int)TX_QLEN(dev), 890 dev->net->mtu, 891 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" : 892 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" : 893 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" : 894 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" : 895 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" : 896 "simple"); 897 898 /* reset rx error state */ 899 dev->pkt_cnt = 0; 900 dev->pkt_err = 0; 901 clear_bit(EVENT_RX_KILL, &dev->flags); 902 903 // delay posting reads until we're fully open 904 tasklet_schedule (&dev->bh); 905 if (info->manage_power) { 906 retval = info->manage_power(dev, 1); 907 if (retval < 0) { 908 retval = 0; 909 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags); 910 } else { 911 usb_autopm_put_interface(dev->intf); 912 } 913 } 914 return retval; 915 done: 916 usb_autopm_put_interface(dev->intf); 917 done_nopm: 918 return retval; 919 } 920 EXPORT_SYMBOL_GPL(usbnet_open); 921 922 /*-------------------------------------------------------------------------*/ 923 924 /* ethtool methods; minidrivers may need to add some more, but 925 * they'll probably want to use this base set. 926 */ 927 928 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd) 929 { 930 struct usbnet *dev = netdev_priv(net); 931 932 if (!dev->mii.mdio_read) 933 return -EOPNOTSUPP; 934 935 return mii_ethtool_gset(&dev->mii, cmd); 936 } 937 EXPORT_SYMBOL_GPL(usbnet_get_settings); 938 939 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd) 940 { 941 struct usbnet *dev = netdev_priv(net); 942 int retval; 943 944 if (!dev->mii.mdio_write) 945 return -EOPNOTSUPP; 946 947 retval = mii_ethtool_sset(&dev->mii, cmd); 948 949 /* link speed/duplex might have changed */ 950 if (dev->driver_info->link_reset) 951 dev->driver_info->link_reset(dev); 952 953 /* hard_mtu or rx_urb_size may change in link_reset() */ 954 usbnet_update_max_qlen(dev); 955 956 return retval; 957 958 } 959 EXPORT_SYMBOL_GPL(usbnet_set_settings); 960 961 u32 usbnet_get_link (struct net_device *net) 962 { 963 struct usbnet *dev = netdev_priv(net); 964 965 /* If a check_connect is defined, return its result */ 966 if (dev->driver_info->check_connect) 967 return dev->driver_info->check_connect (dev) == 0; 968 969 /* if the device has mii operations, use those */ 970 if (dev->mii.mdio_read) 971 return mii_link_ok(&dev->mii); 972 973 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ 974 return ethtool_op_get_link(net); 975 } 976 EXPORT_SYMBOL_GPL(usbnet_get_link); 977 978 int usbnet_nway_reset(struct net_device *net) 979 { 980 struct usbnet *dev = netdev_priv(net); 981 982 if (!dev->mii.mdio_write) 983 return -EOPNOTSUPP; 984 985 return mii_nway_restart(&dev->mii); 986 } 987 EXPORT_SYMBOL_GPL(usbnet_nway_reset); 988 989 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) 990 { 991 struct usbnet *dev = netdev_priv(net); 992 993 strlcpy (info->driver, dev->driver_name, sizeof info->driver); 994 strlcpy (info->version, DRIVER_VERSION, sizeof info->version); 995 strlcpy (info->fw_version, dev->driver_info->description, 996 sizeof info->fw_version); 997 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); 998 } 999 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); 1000 1001 u32 usbnet_get_msglevel (struct net_device *net) 1002 { 1003 struct usbnet *dev = netdev_priv(net); 1004 1005 return dev->msg_enable; 1006 } 1007 EXPORT_SYMBOL_GPL(usbnet_get_msglevel); 1008 1009 void usbnet_set_msglevel (struct net_device *net, u32 level) 1010 { 1011 struct usbnet *dev = netdev_priv(net); 1012 1013 dev->msg_enable = level; 1014 } 1015 EXPORT_SYMBOL_GPL(usbnet_set_msglevel); 1016 1017 /* drivers may override default ethtool_ops in their bind() routine */ 1018 static const struct ethtool_ops usbnet_ethtool_ops = { 1019 .get_settings = usbnet_get_settings, 1020 .set_settings = usbnet_set_settings, 1021 .get_link = usbnet_get_link, 1022 .nway_reset = usbnet_nway_reset, 1023 .get_drvinfo = usbnet_get_drvinfo, 1024 .get_msglevel = usbnet_get_msglevel, 1025 .set_msglevel = usbnet_set_msglevel, 1026 .get_ts_info = ethtool_op_get_ts_info, 1027 }; 1028 1029 /*-------------------------------------------------------------------------*/ 1030 1031 static void __handle_link_change(struct usbnet *dev) 1032 { 1033 if (!test_bit(EVENT_DEV_OPEN, &dev->flags)) 1034 return; 1035 1036 if (!netif_carrier_ok(dev->net)) { 1037 /* kill URBs for reading packets to save bus bandwidth */ 1038 unlink_urbs(dev, &dev->rxq); 1039 1040 /* 1041 * tx_timeout will unlink URBs for sending packets and 1042 * tx queue is stopped by netcore after link becomes off 1043 */ 1044 } else { 1045 /* submitting URBs for reading packets */ 1046 tasklet_schedule(&dev->bh); 1047 } 1048 1049 /* hard_mtu or rx_urb_size may change during link change */ 1050 usbnet_update_max_qlen(dev); 1051 1052 clear_bit(EVENT_LINK_CHANGE, &dev->flags); 1053 } 1054 1055 /* work that cannot be done in interrupt context uses keventd. 1056 * 1057 * NOTE: with 2.5 we could do more of this using completion callbacks, 1058 * especially now that control transfers can be queued. 1059 */ 1060 static void 1061 kevent (struct work_struct *work) 1062 { 1063 struct usbnet *dev = 1064 container_of(work, struct usbnet, kevent); 1065 int status; 1066 1067 /* usb_clear_halt() needs a thread context */ 1068 if (test_bit (EVENT_TX_HALT, &dev->flags)) { 1069 unlink_urbs (dev, &dev->txq); 1070 status = usb_autopm_get_interface(dev->intf); 1071 if (status < 0) 1072 goto fail_pipe; 1073 status = usb_clear_halt (dev->udev, dev->out); 1074 usb_autopm_put_interface(dev->intf); 1075 if (status < 0 && 1076 status != -EPIPE && 1077 status != -ESHUTDOWN) { 1078 if (netif_msg_tx_err (dev)) 1079 fail_pipe: 1080 netdev_err(dev->net, "can't clear tx halt, status %d\n", 1081 status); 1082 } else { 1083 clear_bit (EVENT_TX_HALT, &dev->flags); 1084 if (status != -ESHUTDOWN) 1085 netif_wake_queue (dev->net); 1086 } 1087 } 1088 if (test_bit (EVENT_RX_HALT, &dev->flags)) { 1089 unlink_urbs (dev, &dev->rxq); 1090 status = usb_autopm_get_interface(dev->intf); 1091 if (status < 0) 1092 goto fail_halt; 1093 status = usb_clear_halt (dev->udev, dev->in); 1094 usb_autopm_put_interface(dev->intf); 1095 if (status < 0 && 1096 status != -EPIPE && 1097 status != -ESHUTDOWN) { 1098 if (netif_msg_rx_err (dev)) 1099 fail_halt: 1100 netdev_err(dev->net, "can't clear rx halt, status %d\n", 1101 status); 1102 } else { 1103 clear_bit (EVENT_RX_HALT, &dev->flags); 1104 tasklet_schedule (&dev->bh); 1105 } 1106 } 1107 1108 /* tasklet could resubmit itself forever if memory is tight */ 1109 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { 1110 struct urb *urb = NULL; 1111 int resched = 1; 1112 1113 if (netif_running (dev->net)) 1114 urb = usb_alloc_urb (0, GFP_KERNEL); 1115 else 1116 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1117 if (urb != NULL) { 1118 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1119 status = usb_autopm_get_interface(dev->intf); 1120 if (status < 0) { 1121 usb_free_urb(urb); 1122 goto fail_lowmem; 1123 } 1124 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) 1125 resched = 0; 1126 usb_autopm_put_interface(dev->intf); 1127 fail_lowmem: 1128 if (resched) 1129 tasklet_schedule (&dev->bh); 1130 } 1131 } 1132 1133 if (test_bit (EVENT_LINK_RESET, &dev->flags)) { 1134 struct driver_info *info = dev->driver_info; 1135 int retval = 0; 1136 1137 clear_bit (EVENT_LINK_RESET, &dev->flags); 1138 status = usb_autopm_get_interface(dev->intf); 1139 if (status < 0) 1140 goto skip_reset; 1141 if(info->link_reset && (retval = info->link_reset(dev)) < 0) { 1142 usb_autopm_put_interface(dev->intf); 1143 skip_reset: 1144 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", 1145 retval, 1146 dev->udev->bus->bus_name, 1147 dev->udev->devpath, 1148 info->description); 1149 } else { 1150 usb_autopm_put_interface(dev->intf); 1151 } 1152 1153 /* handle link change from link resetting */ 1154 __handle_link_change(dev); 1155 } 1156 1157 if (test_bit (EVENT_LINK_CHANGE, &dev->flags)) 1158 __handle_link_change(dev); 1159 1160 if (dev->flags) 1161 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); 1162 } 1163 1164 /*-------------------------------------------------------------------------*/ 1165 1166 static void tx_complete (struct urb *urb) 1167 { 1168 struct sk_buff *skb = (struct sk_buff *) urb->context; 1169 struct skb_data *entry = (struct skb_data *) skb->cb; 1170 struct usbnet *dev = entry->dev; 1171 1172 if (urb->status == 0) { 1173 if (!(dev->driver_info->flags & FLAG_MULTI_PACKET)) 1174 dev->net->stats.tx_packets++; 1175 dev->net->stats.tx_bytes += entry->length; 1176 } else { 1177 dev->net->stats.tx_errors++; 1178 1179 switch (urb->status) { 1180 case -EPIPE: 1181 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1182 break; 1183 1184 /* software-driven interface shutdown */ 1185 case -ECONNRESET: // async unlink 1186 case -ESHUTDOWN: // hardware gone 1187 break; 1188 1189 /* like rx, tx gets controller i/o faults during hub_wq 1190 * delays and so it uses the same throttling mechanism. 1191 */ 1192 case -EPROTO: 1193 case -ETIME: 1194 case -EILSEQ: 1195 usb_mark_last_busy(dev->udev); 1196 if (!timer_pending (&dev->delay)) { 1197 mod_timer (&dev->delay, 1198 jiffies + THROTTLE_JIFFIES); 1199 netif_dbg(dev, link, dev->net, 1200 "tx throttle %d\n", urb->status); 1201 } 1202 netif_stop_queue (dev->net); 1203 break; 1204 default: 1205 netif_dbg(dev, tx_err, dev->net, 1206 "tx err %d\n", entry->urb->status); 1207 break; 1208 } 1209 } 1210 1211 usb_autopm_put_interface_async(dev->intf); 1212 (void) defer_bh(dev, skb, &dev->txq, tx_done); 1213 } 1214 1215 /*-------------------------------------------------------------------------*/ 1216 1217 void usbnet_tx_timeout (struct net_device *net) 1218 { 1219 struct usbnet *dev = netdev_priv(net); 1220 1221 unlink_urbs (dev, &dev->txq); 1222 tasklet_schedule (&dev->bh); 1223 /* this needs to be handled individually because the generic layer 1224 * doesn't know what is sufficient and could not restore private 1225 * information if a remedy of an unconditional reset were used. 1226 */ 1227 if (dev->driver_info->recover) 1228 (dev->driver_info->recover)(dev); 1229 } 1230 EXPORT_SYMBOL_GPL(usbnet_tx_timeout); 1231 1232 /*-------------------------------------------------------------------------*/ 1233 1234 static int build_dma_sg(const struct sk_buff *skb, struct urb *urb) 1235 { 1236 unsigned num_sgs, total_len = 0; 1237 int i, s = 0; 1238 1239 num_sgs = skb_shinfo(skb)->nr_frags + 1; 1240 if (num_sgs == 1) 1241 return 0; 1242 1243 /* reserve one for zero packet */ 1244 urb->sg = kmalloc((num_sgs + 1) * sizeof(struct scatterlist), 1245 GFP_ATOMIC); 1246 if (!urb->sg) 1247 return -ENOMEM; 1248 1249 urb->num_sgs = num_sgs; 1250 sg_init_table(urb->sg, urb->num_sgs + 1); 1251 1252 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb)); 1253 total_len += skb_headlen(skb); 1254 1255 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1256 struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i]; 1257 1258 total_len += skb_frag_size(f); 1259 sg_set_page(&urb->sg[i + s], f->page.p, f->size, 1260 f->page_offset); 1261 } 1262 urb->transfer_buffer_length = total_len; 1263 1264 return 1; 1265 } 1266 1267 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, 1268 struct net_device *net) 1269 { 1270 struct usbnet *dev = netdev_priv(net); 1271 int length; 1272 struct urb *urb = NULL; 1273 struct skb_data *entry; 1274 struct driver_info *info = dev->driver_info; 1275 unsigned long flags; 1276 int retval; 1277 1278 if (skb) 1279 skb_tx_timestamp(skb); 1280 1281 // some devices want funky USB-level framing, for 1282 // win32 driver (usually) and/or hardware quirks 1283 if (info->tx_fixup) { 1284 skb = info->tx_fixup (dev, skb, GFP_ATOMIC); 1285 if (!skb) { 1286 /* packet collected; minidriver waiting for more */ 1287 if (info->flags & FLAG_MULTI_PACKET) 1288 goto not_drop; 1289 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); 1290 goto drop; 1291 } 1292 } 1293 1294 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { 1295 netif_dbg(dev, tx_err, dev->net, "no urb\n"); 1296 goto drop; 1297 } 1298 1299 entry = (struct skb_data *) skb->cb; 1300 entry->urb = urb; 1301 entry->dev = dev; 1302 1303 usb_fill_bulk_urb (urb, dev->udev, dev->out, 1304 skb->data, skb->len, tx_complete, skb); 1305 if (dev->can_dma_sg) { 1306 if (build_dma_sg(skb, urb) < 0) 1307 goto drop; 1308 } 1309 length = urb->transfer_buffer_length; 1310 1311 /* don't assume the hardware handles USB_ZERO_PACKET 1312 * NOTE: strictly conforming cdc-ether devices should expect 1313 * the ZLP here, but ignore the one-byte packet. 1314 * NOTE2: CDC NCM specification is different from CDC ECM when 1315 * handling ZLP/short packets, so cdc_ncm driver will make short 1316 * packet itself if needed. 1317 */ 1318 if (length % dev->maxpacket == 0) { 1319 if (!(info->flags & FLAG_SEND_ZLP)) { 1320 if (!(info->flags & FLAG_MULTI_PACKET)) { 1321 length++; 1322 if (skb_tailroom(skb) && !urb->num_sgs) { 1323 skb->data[skb->len] = 0; 1324 __skb_put(skb, 1); 1325 } else if (urb->num_sgs) 1326 sg_set_buf(&urb->sg[urb->num_sgs++], 1327 dev->padding_pkt, 1); 1328 } 1329 } else 1330 urb->transfer_flags |= URB_ZERO_PACKET; 1331 } 1332 entry->length = urb->transfer_buffer_length = length; 1333 1334 spin_lock_irqsave(&dev->txq.lock, flags); 1335 retval = usb_autopm_get_interface_async(dev->intf); 1336 if (retval < 0) { 1337 spin_unlock_irqrestore(&dev->txq.lock, flags); 1338 goto drop; 1339 } 1340 1341 #ifdef CONFIG_PM 1342 /* if this triggers the device is still a sleep */ 1343 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { 1344 /* transmission will be done in resume */ 1345 usb_anchor_urb(urb, &dev->deferred); 1346 /* no use to process more packets */ 1347 netif_stop_queue(net); 1348 usb_put_urb(urb); 1349 spin_unlock_irqrestore(&dev->txq.lock, flags); 1350 netdev_dbg(dev->net, "Delaying transmission for resumption\n"); 1351 goto deferred; 1352 } 1353 #endif 1354 1355 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { 1356 case -EPIPE: 1357 netif_stop_queue (net); 1358 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1359 usb_autopm_put_interface_async(dev->intf); 1360 break; 1361 default: 1362 usb_autopm_put_interface_async(dev->intf); 1363 netif_dbg(dev, tx_err, dev->net, 1364 "tx: submit urb err %d\n", retval); 1365 break; 1366 case 0: 1367 net->trans_start = jiffies; 1368 __usbnet_queue_skb(&dev->txq, skb, tx_start); 1369 if (dev->txq.qlen >= TX_QLEN (dev)) 1370 netif_stop_queue (net); 1371 } 1372 spin_unlock_irqrestore (&dev->txq.lock, flags); 1373 1374 if (retval) { 1375 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); 1376 drop: 1377 dev->net->stats.tx_dropped++; 1378 not_drop: 1379 if (skb) 1380 dev_kfree_skb_any (skb); 1381 if (urb) { 1382 kfree(urb->sg); 1383 usb_free_urb(urb); 1384 } 1385 } else 1386 netif_dbg(dev, tx_queued, dev->net, 1387 "> tx, len %d, type 0x%x\n", length, skb->protocol); 1388 #ifdef CONFIG_PM 1389 deferred: 1390 #endif 1391 return NETDEV_TX_OK; 1392 } 1393 EXPORT_SYMBOL_GPL(usbnet_start_xmit); 1394 1395 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags) 1396 { 1397 struct urb *urb; 1398 int i; 1399 int ret = 0; 1400 1401 /* don't refill the queue all at once */ 1402 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) { 1403 urb = usb_alloc_urb(0, flags); 1404 if (urb != NULL) { 1405 ret = rx_submit(dev, urb, flags); 1406 if (ret) 1407 goto err; 1408 } else { 1409 ret = -ENOMEM; 1410 goto err; 1411 } 1412 } 1413 err: 1414 return ret; 1415 } 1416 1417 /*-------------------------------------------------------------------------*/ 1418 1419 // tasklet (work deferred from completions, in_irq) or timer 1420 1421 static void usbnet_bh (unsigned long param) 1422 { 1423 struct usbnet *dev = (struct usbnet *) param; 1424 struct sk_buff *skb; 1425 struct skb_data *entry; 1426 1427 while ((skb = skb_dequeue (&dev->done))) { 1428 entry = (struct skb_data *) skb->cb; 1429 switch (entry->state) { 1430 case rx_done: 1431 entry->state = rx_cleanup; 1432 rx_process (dev, skb); 1433 continue; 1434 case tx_done: 1435 kfree(entry->urb->sg); 1436 case rx_cleanup: 1437 usb_free_urb (entry->urb); 1438 dev_kfree_skb (skb); 1439 continue; 1440 default: 1441 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); 1442 } 1443 } 1444 1445 /* restart RX again after disabling due to high error rate */ 1446 clear_bit(EVENT_RX_KILL, &dev->flags); 1447 1448 /* waiting for all pending urbs to complete? 1449 * only then can we forgo submitting anew 1450 */ 1451 if (waitqueue_active(&dev->wait)) { 1452 if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0) 1453 wake_up_all(&dev->wait); 1454 1455 // or are we maybe short a few urbs? 1456 } else if (netif_running (dev->net) && 1457 netif_device_present (dev->net) && 1458 netif_carrier_ok(dev->net) && 1459 !timer_pending (&dev->delay) && 1460 !test_bit (EVENT_RX_HALT, &dev->flags)) { 1461 int temp = dev->rxq.qlen; 1462 1463 if (temp < RX_QLEN(dev)) { 1464 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK) 1465 return; 1466 if (temp != dev->rxq.qlen) 1467 netif_dbg(dev, link, dev->net, 1468 "rxqlen %d --> %d\n", 1469 temp, dev->rxq.qlen); 1470 if (dev->rxq.qlen < RX_QLEN(dev)) 1471 tasklet_schedule (&dev->bh); 1472 } 1473 if (dev->txq.qlen < TX_QLEN (dev)) 1474 netif_wake_queue (dev->net); 1475 } 1476 } 1477 1478 1479 /*------------------------------------------------------------------------- 1480 * 1481 * USB Device Driver support 1482 * 1483 *-------------------------------------------------------------------------*/ 1484 1485 // precondition: never called in_interrupt 1486 1487 void usbnet_disconnect (struct usb_interface *intf) 1488 { 1489 struct usbnet *dev; 1490 struct usb_device *xdev; 1491 struct net_device *net; 1492 1493 dev = usb_get_intfdata(intf); 1494 usb_set_intfdata(intf, NULL); 1495 if (!dev) 1496 return; 1497 1498 xdev = interface_to_usbdev (intf); 1499 1500 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", 1501 intf->dev.driver->name, 1502 xdev->bus->bus_name, xdev->devpath, 1503 dev->driver_info->description); 1504 1505 net = dev->net; 1506 unregister_netdev (net); 1507 1508 cancel_work_sync(&dev->kevent); 1509 1510 usb_scuttle_anchored_urbs(&dev->deferred); 1511 1512 if (dev->driver_info->unbind) 1513 dev->driver_info->unbind (dev, intf); 1514 1515 usb_kill_urb(dev->interrupt); 1516 usb_free_urb(dev->interrupt); 1517 kfree(dev->padding_pkt); 1518 1519 free_netdev(net); 1520 } 1521 EXPORT_SYMBOL_GPL(usbnet_disconnect); 1522 1523 static const struct net_device_ops usbnet_netdev_ops = { 1524 .ndo_open = usbnet_open, 1525 .ndo_stop = usbnet_stop, 1526 .ndo_start_xmit = usbnet_start_xmit, 1527 .ndo_tx_timeout = usbnet_tx_timeout, 1528 .ndo_change_mtu = usbnet_change_mtu, 1529 .ndo_set_mac_address = eth_mac_addr, 1530 .ndo_validate_addr = eth_validate_addr, 1531 }; 1532 1533 /*-------------------------------------------------------------------------*/ 1534 1535 // precondition: never called in_interrupt 1536 1537 static struct device_type wlan_type = { 1538 .name = "wlan", 1539 }; 1540 1541 static struct device_type wwan_type = { 1542 .name = "wwan", 1543 }; 1544 1545 int 1546 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) 1547 { 1548 struct usbnet *dev; 1549 struct net_device *net; 1550 struct usb_host_interface *interface; 1551 struct driver_info *info; 1552 struct usb_device *xdev; 1553 int status; 1554 const char *name; 1555 struct usb_driver *driver = to_usb_driver(udev->dev.driver); 1556 1557 /* usbnet already took usb runtime pm, so have to enable the feature 1558 * for usb interface, otherwise usb_autopm_get_interface may return 1559 * failure if RUNTIME_PM is enabled. 1560 */ 1561 if (!driver->supports_autosuspend) { 1562 driver->supports_autosuspend = 1; 1563 pm_runtime_enable(&udev->dev); 1564 } 1565 1566 name = udev->dev.driver->name; 1567 info = (struct driver_info *) prod->driver_info; 1568 if (!info) { 1569 dev_dbg (&udev->dev, "blacklisted by %s\n", name); 1570 return -ENODEV; 1571 } 1572 xdev = interface_to_usbdev (udev); 1573 interface = udev->cur_altsetting; 1574 1575 status = -ENOMEM; 1576 1577 // set up our own records 1578 net = alloc_etherdev(sizeof(*dev)); 1579 if (!net) 1580 goto out; 1581 1582 /* netdev_printk() needs this so do it as early as possible */ 1583 SET_NETDEV_DEV(net, &udev->dev); 1584 1585 dev = netdev_priv(net); 1586 dev->udev = xdev; 1587 dev->intf = udev; 1588 dev->driver_info = info; 1589 dev->driver_name = name; 1590 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV 1591 | NETIF_MSG_PROBE | NETIF_MSG_LINK); 1592 init_waitqueue_head(&dev->wait); 1593 skb_queue_head_init (&dev->rxq); 1594 skb_queue_head_init (&dev->txq); 1595 skb_queue_head_init (&dev->done); 1596 skb_queue_head_init(&dev->rxq_pause); 1597 dev->bh.func = usbnet_bh; 1598 dev->bh.data = (unsigned long) dev; 1599 INIT_WORK (&dev->kevent, kevent); 1600 init_usb_anchor(&dev->deferred); 1601 dev->delay.function = usbnet_bh; 1602 dev->delay.data = (unsigned long) dev; 1603 init_timer (&dev->delay); 1604 mutex_init (&dev->phy_mutex); 1605 mutex_init(&dev->interrupt_mutex); 1606 dev->interrupt_count = 0; 1607 1608 dev->net = net; 1609 strcpy (net->name, "usb%d"); 1610 memcpy (net->dev_addr, node_id, sizeof node_id); 1611 1612 /* rx and tx sides can use different message sizes; 1613 * bind() should set rx_urb_size in that case. 1614 */ 1615 dev->hard_mtu = net->mtu + net->hard_header_len; 1616 #if 0 1617 // dma_supported() is deeply broken on almost all architectures 1618 // possible with some EHCI controllers 1619 if (dma_supported (&udev->dev, DMA_BIT_MASK(64))) 1620 net->features |= NETIF_F_HIGHDMA; 1621 #endif 1622 1623 net->netdev_ops = &usbnet_netdev_ops; 1624 net->watchdog_timeo = TX_TIMEOUT_JIFFIES; 1625 net->ethtool_ops = &usbnet_ethtool_ops; 1626 1627 // allow device-specific bind/init procedures 1628 // NOTE net->name still not usable ... 1629 if (info->bind) { 1630 status = info->bind (dev, udev); 1631 if (status < 0) 1632 goto out1; 1633 1634 // heuristic: "usb%d" for links we know are two-host, 1635 // else "eth%d" when there's reasonable doubt. userspace 1636 // can rename the link if it knows better. 1637 if ((dev->driver_info->flags & FLAG_ETHER) != 0 && 1638 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 || 1639 (net->dev_addr [0] & 0x02) == 0)) 1640 strcpy (net->name, "eth%d"); 1641 /* WLAN devices should always be named "wlan%d" */ 1642 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1643 strcpy(net->name, "wlan%d"); 1644 /* WWAN devices should always be named "wwan%d" */ 1645 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1646 strcpy(net->name, "wwan%d"); 1647 1648 /* devices that cannot do ARP */ 1649 if ((dev->driver_info->flags & FLAG_NOARP) != 0) 1650 net->flags |= IFF_NOARP; 1651 1652 /* maybe the remote can't receive an Ethernet MTU */ 1653 if (net->mtu > (dev->hard_mtu - net->hard_header_len)) 1654 net->mtu = dev->hard_mtu - net->hard_header_len; 1655 } else if (!info->in || !info->out) 1656 status = usbnet_get_endpoints (dev, udev); 1657 else { 1658 dev->in = usb_rcvbulkpipe (xdev, info->in); 1659 dev->out = usb_sndbulkpipe (xdev, info->out); 1660 if (!(info->flags & FLAG_NO_SETINT)) 1661 status = usb_set_interface (xdev, 1662 interface->desc.bInterfaceNumber, 1663 interface->desc.bAlternateSetting); 1664 else 1665 status = 0; 1666 1667 } 1668 if (status >= 0 && dev->status) 1669 status = init_status (dev, udev); 1670 if (status < 0) 1671 goto out3; 1672 1673 if (!dev->rx_urb_size) 1674 dev->rx_urb_size = dev->hard_mtu; 1675 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); 1676 1677 /* let userspace know we have a random address */ 1678 if (ether_addr_equal(net->dev_addr, node_id)) 1679 net->addr_assign_type = NET_ADDR_RANDOM; 1680 1681 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1682 SET_NETDEV_DEVTYPE(net, &wlan_type); 1683 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1684 SET_NETDEV_DEVTYPE(net, &wwan_type); 1685 1686 /* initialize max rx_qlen and tx_qlen */ 1687 usbnet_update_max_qlen(dev); 1688 1689 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) && 1690 !(info->flags & FLAG_MULTI_PACKET)) { 1691 dev->padding_pkt = kzalloc(1, GFP_KERNEL); 1692 if (!dev->padding_pkt) { 1693 status = -ENOMEM; 1694 goto out4; 1695 } 1696 } 1697 1698 status = register_netdev (net); 1699 if (status) 1700 goto out5; 1701 netif_info(dev, probe, dev->net, 1702 "register '%s' at usb-%s-%s, %s, %pM\n", 1703 udev->dev.driver->name, 1704 xdev->bus->bus_name, xdev->devpath, 1705 dev->driver_info->description, 1706 net->dev_addr); 1707 1708 // ok, it's ready to go. 1709 usb_set_intfdata (udev, dev); 1710 1711 netif_device_attach (net); 1712 1713 if (dev->driver_info->flags & FLAG_LINK_INTR) 1714 usbnet_link_change(dev, 0, 0); 1715 1716 return 0; 1717 1718 out5: 1719 kfree(dev->padding_pkt); 1720 out4: 1721 usb_free_urb(dev->interrupt); 1722 out3: 1723 if (info->unbind) 1724 info->unbind (dev, udev); 1725 out1: 1726 free_netdev(net); 1727 out: 1728 return status; 1729 } 1730 EXPORT_SYMBOL_GPL(usbnet_probe); 1731 1732 /*-------------------------------------------------------------------------*/ 1733 1734 /* 1735 * suspend the whole driver as soon as the first interface is suspended 1736 * resume only when the last interface is resumed 1737 */ 1738 1739 int usbnet_suspend (struct usb_interface *intf, pm_message_t message) 1740 { 1741 struct usbnet *dev = usb_get_intfdata(intf); 1742 1743 if (!dev->suspend_count++) { 1744 spin_lock_irq(&dev->txq.lock); 1745 /* don't autosuspend while transmitting */ 1746 if (dev->txq.qlen && PMSG_IS_AUTO(message)) { 1747 dev->suspend_count--; 1748 spin_unlock_irq(&dev->txq.lock); 1749 return -EBUSY; 1750 } else { 1751 set_bit(EVENT_DEV_ASLEEP, &dev->flags); 1752 spin_unlock_irq(&dev->txq.lock); 1753 } 1754 /* 1755 * accelerate emptying of the rx and queues, to avoid 1756 * having everything error out. 1757 */ 1758 netif_device_detach (dev->net); 1759 usbnet_terminate_urbs(dev); 1760 __usbnet_status_stop_force(dev); 1761 1762 /* 1763 * reattach so runtime management can use and 1764 * wake the device 1765 */ 1766 netif_device_attach (dev->net); 1767 } 1768 return 0; 1769 } 1770 EXPORT_SYMBOL_GPL(usbnet_suspend); 1771 1772 int usbnet_resume (struct usb_interface *intf) 1773 { 1774 struct usbnet *dev = usb_get_intfdata(intf); 1775 struct sk_buff *skb; 1776 struct urb *res; 1777 int retval; 1778 1779 if (!--dev->suspend_count) { 1780 /* resume interrupt URB if it was previously submitted */ 1781 __usbnet_status_start_force(dev, GFP_NOIO); 1782 1783 spin_lock_irq(&dev->txq.lock); 1784 while ((res = usb_get_from_anchor(&dev->deferred))) { 1785 1786 skb = (struct sk_buff *)res->context; 1787 retval = usb_submit_urb(res, GFP_ATOMIC); 1788 if (retval < 0) { 1789 dev_kfree_skb_any(skb); 1790 kfree(res->sg); 1791 usb_free_urb(res); 1792 usb_autopm_put_interface_async(dev->intf); 1793 } else { 1794 dev->net->trans_start = jiffies; 1795 __skb_queue_tail(&dev->txq, skb); 1796 } 1797 } 1798 1799 smp_mb(); 1800 clear_bit(EVENT_DEV_ASLEEP, &dev->flags); 1801 spin_unlock_irq(&dev->txq.lock); 1802 1803 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) { 1804 /* handle remote wakeup ASAP 1805 * we cannot race against stop 1806 */ 1807 if (netif_device_present(dev->net) && 1808 !timer_pending(&dev->delay) && 1809 !test_bit(EVENT_RX_HALT, &dev->flags)) 1810 rx_alloc_submit(dev, GFP_NOIO); 1811 1812 if (!(dev->txq.qlen >= TX_QLEN(dev))) 1813 netif_tx_wake_all_queues(dev->net); 1814 tasklet_schedule (&dev->bh); 1815 } 1816 } 1817 1818 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) 1819 usb_autopm_get_interface_no_resume(intf); 1820 1821 return 0; 1822 } 1823 EXPORT_SYMBOL_GPL(usbnet_resume); 1824 1825 /* 1826 * Either a subdriver implements manage_power, then it is assumed to always 1827 * be ready to be suspended or it reports the readiness to be suspended 1828 * explicitly 1829 */ 1830 void usbnet_device_suggests_idle(struct usbnet *dev) 1831 { 1832 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) { 1833 dev->intf->needs_remote_wakeup = 1; 1834 usb_autopm_put_interface_async(dev->intf); 1835 } 1836 } 1837 EXPORT_SYMBOL(usbnet_device_suggests_idle); 1838 1839 /* 1840 * For devices that can do without special commands 1841 */ 1842 int usbnet_manage_power(struct usbnet *dev, int on) 1843 { 1844 dev->intf->needs_remote_wakeup = on; 1845 return 0; 1846 } 1847 EXPORT_SYMBOL(usbnet_manage_power); 1848 1849 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset) 1850 { 1851 /* update link after link is reseted */ 1852 if (link && !need_reset) 1853 netif_carrier_on(dev->net); 1854 else 1855 netif_carrier_off(dev->net); 1856 1857 if (need_reset && link) 1858 usbnet_defer_kevent(dev, EVENT_LINK_RESET); 1859 else 1860 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE); 1861 } 1862 EXPORT_SYMBOL(usbnet_link_change); 1863 1864 /*-------------------------------------------------------------------------*/ 1865 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1866 u16 value, u16 index, void *data, u16 size) 1867 { 1868 void *buf = NULL; 1869 int err = -ENOMEM; 1870 1871 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x" 1872 " value=0x%04x index=0x%04x size=%d\n", 1873 cmd, reqtype, value, index, size); 1874 1875 if (data) { 1876 buf = kmalloc(size, GFP_KERNEL); 1877 if (!buf) 1878 goto out; 1879 } 1880 1881 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), 1882 cmd, reqtype, value, index, buf, size, 1883 USB_CTRL_GET_TIMEOUT); 1884 if (err > 0 && err <= size) 1885 memcpy(data, buf, err); 1886 kfree(buf); 1887 out: 1888 return err; 1889 } 1890 1891 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1892 u16 value, u16 index, const void *data, 1893 u16 size) 1894 { 1895 void *buf = NULL; 1896 int err = -ENOMEM; 1897 1898 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 1899 " value=0x%04x index=0x%04x size=%d\n", 1900 cmd, reqtype, value, index, size); 1901 1902 if (data) { 1903 buf = kmemdup(data, size, GFP_KERNEL); 1904 if (!buf) 1905 goto out; 1906 } 1907 1908 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), 1909 cmd, reqtype, value, index, buf, size, 1910 USB_CTRL_SET_TIMEOUT); 1911 kfree(buf); 1912 1913 out: 1914 return err; 1915 } 1916 1917 /* 1918 * The function can't be called inside suspend/resume callback, 1919 * otherwise deadlock will be caused. 1920 */ 1921 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1922 u16 value, u16 index, void *data, u16 size) 1923 { 1924 int ret; 1925 1926 if (usb_autopm_get_interface(dev->intf) < 0) 1927 return -ENODEV; 1928 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index, 1929 data, size); 1930 usb_autopm_put_interface(dev->intf); 1931 return ret; 1932 } 1933 EXPORT_SYMBOL_GPL(usbnet_read_cmd); 1934 1935 /* 1936 * The function can't be called inside suspend/resume callback, 1937 * otherwise deadlock will be caused. 1938 */ 1939 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1940 u16 value, u16 index, const void *data, u16 size) 1941 { 1942 int ret; 1943 1944 if (usb_autopm_get_interface(dev->intf) < 0) 1945 return -ENODEV; 1946 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index, 1947 data, size); 1948 usb_autopm_put_interface(dev->intf); 1949 return ret; 1950 } 1951 EXPORT_SYMBOL_GPL(usbnet_write_cmd); 1952 1953 /* 1954 * The function can be called inside suspend/resume callback safely 1955 * and should only be called by suspend/resume callback generally. 1956 */ 1957 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 1958 u16 value, u16 index, void *data, u16 size) 1959 { 1960 return __usbnet_read_cmd(dev, cmd, reqtype, value, index, 1961 data, size); 1962 } 1963 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm); 1964 1965 /* 1966 * The function can be called inside suspend/resume callback safely 1967 * and should only be called by suspend/resume callback generally. 1968 */ 1969 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 1970 u16 value, u16 index, const void *data, 1971 u16 size) 1972 { 1973 return __usbnet_write_cmd(dev, cmd, reqtype, value, index, 1974 data, size); 1975 } 1976 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm); 1977 1978 static void usbnet_async_cmd_cb(struct urb *urb) 1979 { 1980 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context; 1981 int status = urb->status; 1982 1983 if (status < 0) 1984 dev_dbg(&urb->dev->dev, "%s failed with %d", 1985 __func__, status); 1986 1987 kfree(req); 1988 usb_free_urb(urb); 1989 } 1990 1991 /* 1992 * The caller must make sure that device can't be put into suspend 1993 * state until the control URB completes. 1994 */ 1995 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype, 1996 u16 value, u16 index, const void *data, u16 size) 1997 { 1998 struct usb_ctrlrequest *req = NULL; 1999 struct urb *urb; 2000 int err = -ENOMEM; 2001 void *buf = NULL; 2002 2003 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 2004 " value=0x%04x index=0x%04x size=%d\n", 2005 cmd, reqtype, value, index, size); 2006 2007 urb = usb_alloc_urb(0, GFP_ATOMIC); 2008 if (!urb) { 2009 netdev_err(dev->net, "Error allocating URB in" 2010 " %s!\n", __func__); 2011 goto fail; 2012 } 2013 2014 if (data) { 2015 buf = kmemdup(data, size, GFP_ATOMIC); 2016 if (!buf) { 2017 netdev_err(dev->net, "Error allocating buffer" 2018 " in %s!\n", __func__); 2019 goto fail_free; 2020 } 2021 } 2022 2023 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC); 2024 if (!req) 2025 goto fail_free_buf; 2026 2027 req->bRequestType = reqtype; 2028 req->bRequest = cmd; 2029 req->wValue = cpu_to_le16(value); 2030 req->wIndex = cpu_to_le16(index); 2031 req->wLength = cpu_to_le16(size); 2032 2033 usb_fill_control_urb(urb, dev->udev, 2034 usb_sndctrlpipe(dev->udev, 0), 2035 (void *)req, buf, size, 2036 usbnet_async_cmd_cb, req); 2037 urb->transfer_flags |= URB_FREE_BUFFER; 2038 2039 err = usb_submit_urb(urb, GFP_ATOMIC); 2040 if (err < 0) { 2041 netdev_err(dev->net, "Error submitting the control" 2042 " message: status=%d\n", err); 2043 goto fail_free; 2044 } 2045 return 0; 2046 2047 fail_free_buf: 2048 kfree(buf); 2049 fail_free: 2050 kfree(req); 2051 usb_free_urb(urb); 2052 fail: 2053 return err; 2054 2055 } 2056 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async); 2057 /*-------------------------------------------------------------------------*/ 2058 2059 static int __init usbnet_init(void) 2060 { 2061 /* Compiler should optimize this out. */ 2062 BUILD_BUG_ON( 2063 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data)); 2064 2065 eth_random_addr(node_id); 2066 return 0; 2067 } 2068 module_init(usbnet_init); 2069 2070 static void __exit usbnet_exit(void) 2071 { 2072 } 2073 module_exit(usbnet_exit); 2074 2075 MODULE_AUTHOR("David Brownell"); 2076 MODULE_DESCRIPTION("USB network driver framework"); 2077 MODULE_LICENSE("GPL"); 2078