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 khubd might disconnect() 73 // us (it polls at HZ/4 usually) before we report too many false errors. 74 #define THROTTLE_JIFFIES (HZ/8) 75 76 // between wakeups 77 #define UNLINK_TIMEOUT_MS 3 78 79 /*-------------------------------------------------------------------------*/ 80 81 // randomly generated ethernet address 82 static u8 node_id [ETH_ALEN]; 83 84 static const char driver_name [] = "usbnet"; 85 86 /* use ethtool to change the level for any given device */ 87 static int msg_level = -1; 88 module_param (msg_level, int, 0); 89 MODULE_PARM_DESC (msg_level, "Override default message level"); 90 91 /*-------------------------------------------------------------------------*/ 92 93 /* handles CDC Ethernet and many other network "bulk data" interfaces */ 94 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf) 95 { 96 int tmp; 97 struct usb_host_interface *alt = NULL; 98 struct usb_host_endpoint *in = NULL, *out = NULL; 99 struct usb_host_endpoint *status = NULL; 100 101 for (tmp = 0; tmp < intf->num_altsetting; tmp++) { 102 unsigned ep; 103 104 in = out = status = NULL; 105 alt = intf->altsetting + tmp; 106 107 /* take the first altsetting with in-bulk + out-bulk; 108 * remember any status endpoint, just in case; 109 * ignore other endpoints and altsettings. 110 */ 111 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) { 112 struct usb_host_endpoint *e; 113 int intr = 0; 114 115 e = alt->endpoint + ep; 116 switch (e->desc.bmAttributes) { 117 case USB_ENDPOINT_XFER_INT: 118 if (!usb_endpoint_dir_in(&e->desc)) 119 continue; 120 intr = 1; 121 /* FALLTHROUGH */ 122 case USB_ENDPOINT_XFER_BULK: 123 break; 124 default: 125 continue; 126 } 127 if (usb_endpoint_dir_in(&e->desc)) { 128 if (!intr && !in) 129 in = e; 130 else if (intr && !status) 131 status = e; 132 } else { 133 if (!out) 134 out = e; 135 } 136 } 137 if (in && out) 138 break; 139 } 140 if (!alt || !in || !out) 141 return -EINVAL; 142 143 if (alt->desc.bAlternateSetting != 0 || 144 !(dev->driver_info->flags & FLAG_NO_SETINT)) { 145 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber, 146 alt->desc.bAlternateSetting); 147 if (tmp < 0) 148 return tmp; 149 } 150 151 dev->in = usb_rcvbulkpipe (dev->udev, 152 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 153 dev->out = usb_sndbulkpipe (dev->udev, 154 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 155 dev->status = status; 156 return 0; 157 } 158 EXPORT_SYMBOL_GPL(usbnet_get_endpoints); 159 160 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress) 161 { 162 int tmp, i; 163 unsigned char buf [13]; 164 165 tmp = usb_string(dev->udev, iMACAddress, buf, sizeof buf); 166 if (tmp != 12) { 167 dev_dbg(&dev->udev->dev, 168 "bad MAC string %d fetch, %d\n", iMACAddress, tmp); 169 if (tmp >= 0) 170 tmp = -EINVAL; 171 return tmp; 172 } 173 for (i = tmp = 0; i < 6; i++, tmp += 2) 174 dev->net->dev_addr [i] = 175 (hex_to_bin(buf[tmp]) << 4) + hex_to_bin(buf[tmp + 1]); 176 return 0; 177 } 178 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr); 179 180 static void intr_complete (struct urb *urb) 181 { 182 struct usbnet *dev = urb->context; 183 int status = urb->status; 184 185 switch (status) { 186 /* success */ 187 case 0: 188 dev->driver_info->status(dev, urb); 189 break; 190 191 /* software-driven interface shutdown */ 192 case -ENOENT: /* urb killed */ 193 case -ESHUTDOWN: /* hardware gone */ 194 netif_dbg(dev, ifdown, dev->net, 195 "intr shutdown, code %d\n", status); 196 return; 197 198 /* NOTE: not throttling like RX/TX, since this endpoint 199 * already polls infrequently 200 */ 201 default: 202 netdev_dbg(dev->net, "intr status %d\n", status); 203 break; 204 } 205 206 status = usb_submit_urb (urb, GFP_ATOMIC); 207 if (status != 0) 208 netif_err(dev, timer, dev->net, 209 "intr resubmit --> %d\n", status); 210 } 211 212 static int init_status (struct usbnet *dev, struct usb_interface *intf) 213 { 214 char *buf = NULL; 215 unsigned pipe = 0; 216 unsigned maxp; 217 unsigned period; 218 219 if (!dev->driver_info->status) 220 return 0; 221 222 pipe = usb_rcvintpipe (dev->udev, 223 dev->status->desc.bEndpointAddress 224 & USB_ENDPOINT_NUMBER_MASK); 225 maxp = usb_maxpacket (dev->udev, pipe, 0); 226 227 /* avoid 1 msec chatter: min 8 msec poll rate */ 228 period = max ((int) dev->status->desc.bInterval, 229 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3); 230 231 buf = kmalloc (maxp, GFP_KERNEL); 232 if (buf) { 233 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL); 234 if (!dev->interrupt) { 235 kfree (buf); 236 return -ENOMEM; 237 } else { 238 usb_fill_int_urb(dev->interrupt, dev->udev, pipe, 239 buf, maxp, intr_complete, dev, period); 240 dev->interrupt->transfer_flags |= URB_FREE_BUFFER; 241 dev_dbg(&intf->dev, 242 "status ep%din, %d bytes period %d\n", 243 usb_pipeendpoint(pipe), maxp, period); 244 } 245 } 246 return 0; 247 } 248 249 /* Submit the interrupt URB if not previously submitted, increasing refcount */ 250 int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags) 251 { 252 int ret = 0; 253 254 WARN_ON_ONCE(dev->interrupt == NULL); 255 if (dev->interrupt) { 256 mutex_lock(&dev->interrupt_mutex); 257 258 if (++dev->interrupt_count == 1) 259 ret = usb_submit_urb(dev->interrupt, mem_flags); 260 261 dev_dbg(&dev->udev->dev, "incremented interrupt URB count to %d\n", 262 dev->interrupt_count); 263 mutex_unlock(&dev->interrupt_mutex); 264 } 265 return ret; 266 } 267 EXPORT_SYMBOL_GPL(usbnet_status_start); 268 269 /* For resume; submit interrupt URB if previously submitted */ 270 static int __usbnet_status_start_force(struct usbnet *dev, gfp_t mem_flags) 271 { 272 int ret = 0; 273 274 mutex_lock(&dev->interrupt_mutex); 275 if (dev->interrupt_count) { 276 ret = usb_submit_urb(dev->interrupt, mem_flags); 277 dev_dbg(&dev->udev->dev, 278 "submitted interrupt URB for resume\n"); 279 } 280 mutex_unlock(&dev->interrupt_mutex); 281 return ret; 282 } 283 284 /* Kill the interrupt URB if all submitters want it killed */ 285 void usbnet_status_stop(struct usbnet *dev) 286 { 287 if (dev->interrupt) { 288 mutex_lock(&dev->interrupt_mutex); 289 WARN_ON(dev->interrupt_count == 0); 290 291 if (dev->interrupt_count && --dev->interrupt_count == 0) 292 usb_kill_urb(dev->interrupt); 293 294 dev_dbg(&dev->udev->dev, 295 "decremented interrupt URB count to %d\n", 296 dev->interrupt_count); 297 mutex_unlock(&dev->interrupt_mutex); 298 } 299 } 300 EXPORT_SYMBOL_GPL(usbnet_status_stop); 301 302 /* For suspend; always kill interrupt URB */ 303 static void __usbnet_status_stop_force(struct usbnet *dev) 304 { 305 if (dev->interrupt) { 306 mutex_lock(&dev->interrupt_mutex); 307 usb_kill_urb(dev->interrupt); 308 dev_dbg(&dev->udev->dev, "killed interrupt URB for suspend\n"); 309 mutex_unlock(&dev->interrupt_mutex); 310 } 311 } 312 313 /* Passes this packet up the stack, updating its accounting. 314 * Some link protocols batch packets, so their rx_fixup paths 315 * can return clones as well as just modify the original skb. 316 */ 317 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb) 318 { 319 int status; 320 321 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) { 322 skb_queue_tail(&dev->rxq_pause, skb); 323 return; 324 } 325 326 skb->protocol = eth_type_trans (skb, dev->net); 327 dev->net->stats.rx_packets++; 328 dev->net->stats.rx_bytes += skb->len; 329 330 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n", 331 skb->len + sizeof (struct ethhdr), skb->protocol); 332 memset (skb->cb, 0, sizeof (struct skb_data)); 333 334 if (skb_defer_rx_timestamp(skb)) 335 return; 336 337 status = netif_rx (skb); 338 if (status != NET_RX_SUCCESS) 339 netif_dbg(dev, rx_err, dev->net, 340 "netif_rx status %d\n", status); 341 } 342 EXPORT_SYMBOL_GPL(usbnet_skb_return); 343 344 /* must be called if hard_mtu or rx_urb_size changed */ 345 void usbnet_update_max_qlen(struct usbnet *dev) 346 { 347 enum usb_device_speed speed = dev->udev->speed; 348 349 switch (speed) { 350 case USB_SPEED_HIGH: 351 dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size; 352 dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu; 353 break; 354 case USB_SPEED_SUPER: 355 /* 356 * Not take default 5ms qlen for super speed HC to 357 * save memory, and iperf tests show 2.5ms qlen can 358 * work well 359 */ 360 dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size; 361 dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu; 362 break; 363 default: 364 dev->rx_qlen = dev->tx_qlen = 4; 365 } 366 } 367 EXPORT_SYMBOL_GPL(usbnet_update_max_qlen); 368 369 370 /*------------------------------------------------------------------------- 371 * 372 * Network Device Driver (peer link to "Host Device", from USB host) 373 * 374 *-------------------------------------------------------------------------*/ 375 376 int usbnet_change_mtu (struct net_device *net, int new_mtu) 377 { 378 struct usbnet *dev = netdev_priv(net); 379 int ll_mtu = new_mtu + net->hard_header_len; 380 int old_hard_mtu = dev->hard_mtu; 381 int old_rx_urb_size = dev->rx_urb_size; 382 383 if (new_mtu <= 0) 384 return -EINVAL; 385 // no second zero-length packet read wanted after mtu-sized packets 386 if ((ll_mtu % dev->maxpacket) == 0) 387 return -EDOM; 388 net->mtu = new_mtu; 389 390 dev->hard_mtu = net->mtu + net->hard_header_len; 391 if (dev->rx_urb_size == old_hard_mtu) { 392 dev->rx_urb_size = dev->hard_mtu; 393 if (dev->rx_urb_size > old_rx_urb_size) 394 usbnet_unlink_rx_urbs(dev); 395 } 396 397 /* max qlen depend on hard_mtu and rx_urb_size */ 398 usbnet_update_max_qlen(dev); 399 400 return 0; 401 } 402 EXPORT_SYMBOL_GPL(usbnet_change_mtu); 403 404 /* The caller must hold list->lock */ 405 static void __usbnet_queue_skb(struct sk_buff_head *list, 406 struct sk_buff *newsk, enum skb_state state) 407 { 408 struct skb_data *entry = (struct skb_data *) newsk->cb; 409 410 __skb_queue_tail(list, newsk); 411 entry->state = state; 412 } 413 414 /*-------------------------------------------------------------------------*/ 415 416 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from 417 * completion callbacks. 2.5 should have fixed those bugs... 418 */ 419 420 static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb, 421 struct sk_buff_head *list, enum skb_state state) 422 { 423 unsigned long flags; 424 enum skb_state old_state; 425 struct skb_data *entry = (struct skb_data *) skb->cb; 426 427 spin_lock_irqsave(&list->lock, flags); 428 old_state = entry->state; 429 entry->state = state; 430 __skb_unlink(skb, list); 431 spin_unlock(&list->lock); 432 spin_lock(&dev->done.lock); 433 __skb_queue_tail(&dev->done, skb); 434 if (dev->done.qlen == 1) 435 tasklet_schedule(&dev->bh); 436 spin_unlock_irqrestore(&dev->done.lock, flags); 437 return old_state; 438 } 439 440 /* some work can't be done in tasklets, so we use keventd 441 * 442 * NOTE: annoying asymmetry: if it's active, schedule_work() fails, 443 * but tasklet_schedule() doesn't. hope the failure is rare. 444 */ 445 void usbnet_defer_kevent (struct usbnet *dev, int work) 446 { 447 set_bit (work, &dev->flags); 448 if (!schedule_work (&dev->kevent)) { 449 if (net_ratelimit()) 450 netdev_err(dev->net, "kevent %d may have been dropped\n", work); 451 } else { 452 netdev_dbg(dev->net, "kevent %d scheduled\n", work); 453 } 454 } 455 EXPORT_SYMBOL_GPL(usbnet_defer_kevent); 456 457 /*-------------------------------------------------------------------------*/ 458 459 static void rx_complete (struct urb *urb); 460 461 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) 462 { 463 struct sk_buff *skb; 464 struct skb_data *entry; 465 int retval = 0; 466 unsigned long lockflags; 467 size_t size = dev->rx_urb_size; 468 469 /* prevent rx skb allocation when error ratio is high */ 470 if (test_bit(EVENT_RX_KILL, &dev->flags)) { 471 usb_free_urb(urb); 472 return -ENOLINK; 473 } 474 475 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags); 476 if (!skb) { 477 netif_dbg(dev, rx_err, dev->net, "no rx skb\n"); 478 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 479 usb_free_urb (urb); 480 return -ENOMEM; 481 } 482 483 entry = (struct skb_data *) skb->cb; 484 entry->urb = urb; 485 entry->dev = dev; 486 entry->length = 0; 487 488 usb_fill_bulk_urb (urb, dev->udev, dev->in, 489 skb->data, size, rx_complete, skb); 490 491 spin_lock_irqsave (&dev->rxq.lock, lockflags); 492 493 if (netif_running (dev->net) && 494 netif_device_present (dev->net) && 495 !test_bit (EVENT_RX_HALT, &dev->flags) && 496 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) { 497 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) { 498 case -EPIPE: 499 usbnet_defer_kevent (dev, EVENT_RX_HALT); 500 break; 501 case -ENOMEM: 502 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 503 break; 504 case -ENODEV: 505 netif_dbg(dev, ifdown, dev->net, "device gone\n"); 506 netif_device_detach (dev->net); 507 break; 508 case -EHOSTUNREACH: 509 retval = -ENOLINK; 510 break; 511 default: 512 netif_dbg(dev, rx_err, dev->net, 513 "rx submit, %d\n", retval); 514 tasklet_schedule (&dev->bh); 515 break; 516 case 0: 517 __usbnet_queue_skb(&dev->rxq, skb, rx_start); 518 } 519 } else { 520 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n"); 521 retval = -ENOLINK; 522 } 523 spin_unlock_irqrestore (&dev->rxq.lock, lockflags); 524 if (retval) { 525 dev_kfree_skb_any (skb); 526 usb_free_urb (urb); 527 } 528 return retval; 529 } 530 531 532 /*-------------------------------------------------------------------------*/ 533 534 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb) 535 { 536 if (dev->driver_info->rx_fixup && 537 !dev->driver_info->rx_fixup (dev, skb)) { 538 /* With RX_ASSEMBLE, rx_fixup() must update counters */ 539 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE)) 540 dev->net->stats.rx_errors++; 541 goto done; 542 } 543 // else network stack removes extra byte if we forced a short packet 544 545 /* all data was already cloned from skb inside the driver */ 546 if (dev->driver_info->flags & FLAG_MULTI_PACKET) 547 goto done; 548 549 if (skb->len < ETH_HLEN) { 550 dev->net->stats.rx_errors++; 551 dev->net->stats.rx_length_errors++; 552 netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len); 553 } else { 554 usbnet_skb_return(dev, skb); 555 return; 556 } 557 558 done: 559 skb_queue_tail(&dev->done, skb); 560 } 561 562 /*-------------------------------------------------------------------------*/ 563 564 static void rx_complete (struct urb *urb) 565 { 566 struct sk_buff *skb = (struct sk_buff *) urb->context; 567 struct skb_data *entry = (struct skb_data *) skb->cb; 568 struct usbnet *dev = entry->dev; 569 int urb_status = urb->status; 570 enum skb_state state; 571 572 skb_put (skb, urb->actual_length); 573 state = rx_done; 574 entry->urb = NULL; 575 576 switch (urb_status) { 577 /* success */ 578 case 0: 579 break; 580 581 /* stalls need manual reset. this is rare ... except that 582 * when going through USB 2.0 TTs, unplug appears this way. 583 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ 584 * storm, recovering as needed. 585 */ 586 case -EPIPE: 587 dev->net->stats.rx_errors++; 588 usbnet_defer_kevent (dev, EVENT_RX_HALT); 589 // FALLTHROUGH 590 591 /* software-driven interface shutdown */ 592 case -ECONNRESET: /* async unlink */ 593 case -ESHUTDOWN: /* hardware gone */ 594 netif_dbg(dev, ifdown, dev->net, 595 "rx shutdown, code %d\n", urb_status); 596 goto block; 597 598 /* we get controller i/o faults during khubd disconnect() delays. 599 * throttle down resubmits, to avoid log floods; just temporarily, 600 * so we still recover when the fault isn't a khubd delay. 601 */ 602 case -EPROTO: 603 case -ETIME: 604 case -EILSEQ: 605 dev->net->stats.rx_errors++; 606 if (!timer_pending (&dev->delay)) { 607 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); 608 netif_dbg(dev, link, dev->net, 609 "rx throttle %d\n", urb_status); 610 } 611 block: 612 state = rx_cleanup; 613 entry->urb = urb; 614 urb = NULL; 615 break; 616 617 /* data overrun ... flush fifo? */ 618 case -EOVERFLOW: 619 dev->net->stats.rx_over_errors++; 620 // FALLTHROUGH 621 622 default: 623 state = rx_cleanup; 624 dev->net->stats.rx_errors++; 625 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status); 626 break; 627 } 628 629 /* stop rx if packet error rate is high */ 630 if (++dev->pkt_cnt > 30) { 631 dev->pkt_cnt = 0; 632 dev->pkt_err = 0; 633 } else { 634 if (state == rx_cleanup) 635 dev->pkt_err++; 636 if (dev->pkt_err > 20) 637 set_bit(EVENT_RX_KILL, &dev->flags); 638 } 639 640 state = defer_bh(dev, skb, &dev->rxq, state); 641 642 if (urb) { 643 if (netif_running (dev->net) && 644 !test_bit (EVENT_RX_HALT, &dev->flags) && 645 state != unlink_start) { 646 rx_submit (dev, urb, GFP_ATOMIC); 647 usb_mark_last_busy(dev->udev); 648 return; 649 } 650 usb_free_urb (urb); 651 } 652 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n"); 653 } 654 655 /*-------------------------------------------------------------------------*/ 656 void usbnet_pause_rx(struct usbnet *dev) 657 { 658 set_bit(EVENT_RX_PAUSED, &dev->flags); 659 660 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n"); 661 } 662 EXPORT_SYMBOL_GPL(usbnet_pause_rx); 663 664 void usbnet_resume_rx(struct usbnet *dev) 665 { 666 struct sk_buff *skb; 667 int num = 0; 668 669 clear_bit(EVENT_RX_PAUSED, &dev->flags); 670 671 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) { 672 usbnet_skb_return(dev, skb); 673 num++; 674 } 675 676 tasklet_schedule(&dev->bh); 677 678 netif_dbg(dev, rx_status, dev->net, 679 "paused rx queue disabled, %d skbs requeued\n", num); 680 } 681 EXPORT_SYMBOL_GPL(usbnet_resume_rx); 682 683 void usbnet_purge_paused_rxq(struct usbnet *dev) 684 { 685 skb_queue_purge(&dev->rxq_pause); 686 } 687 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq); 688 689 /*-------------------------------------------------------------------------*/ 690 691 // unlink pending rx/tx; completion handlers do all other cleanup 692 693 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) 694 { 695 unsigned long flags; 696 struct sk_buff *skb; 697 int count = 0; 698 699 spin_lock_irqsave (&q->lock, flags); 700 while (!skb_queue_empty(q)) { 701 struct skb_data *entry; 702 struct urb *urb; 703 int retval; 704 705 skb_queue_walk(q, skb) { 706 entry = (struct skb_data *) skb->cb; 707 if (entry->state != unlink_start) 708 goto found; 709 } 710 break; 711 found: 712 entry->state = unlink_start; 713 urb = entry->urb; 714 715 /* 716 * Get reference count of the URB to avoid it to be 717 * freed during usb_unlink_urb, which may trigger 718 * use-after-free problem inside usb_unlink_urb since 719 * usb_unlink_urb is always racing with .complete 720 * handler(include defer_bh). 721 */ 722 usb_get_urb(urb); 723 spin_unlock_irqrestore(&q->lock, flags); 724 // during some PM-driven resume scenarios, 725 // these (async) unlinks complete immediately 726 retval = usb_unlink_urb (urb); 727 if (retval != -EINPROGRESS && retval != 0) 728 netdev_dbg(dev->net, "unlink urb err, %d\n", retval); 729 else 730 count++; 731 usb_put_urb(urb); 732 spin_lock_irqsave(&q->lock, flags); 733 } 734 spin_unlock_irqrestore (&q->lock, flags); 735 return count; 736 } 737 738 // Flush all pending rx urbs 739 // minidrivers may need to do this when the MTU changes 740 741 void usbnet_unlink_rx_urbs(struct usbnet *dev) 742 { 743 if (netif_running(dev->net)) { 744 (void) unlink_urbs (dev, &dev->rxq); 745 tasklet_schedule(&dev->bh); 746 } 747 } 748 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); 749 750 /*-------------------------------------------------------------------------*/ 751 752 // precondition: never called in_interrupt 753 static void usbnet_terminate_urbs(struct usbnet *dev) 754 { 755 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup); 756 DECLARE_WAITQUEUE(wait, current); 757 int temp; 758 759 /* ensure there are no more active urbs */ 760 add_wait_queue(&unlink_wakeup, &wait); 761 set_current_state(TASK_UNINTERRUPTIBLE); 762 dev->wait = &unlink_wakeup; 763 temp = unlink_urbs(dev, &dev->txq) + 764 unlink_urbs(dev, &dev->rxq); 765 766 /* maybe wait for deletions to finish. */ 767 while (!skb_queue_empty(&dev->rxq) 768 && !skb_queue_empty(&dev->txq) 769 && !skb_queue_empty(&dev->done)) { 770 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS)); 771 set_current_state(TASK_UNINTERRUPTIBLE); 772 netif_dbg(dev, ifdown, dev->net, 773 "waited for %d urb completions\n", temp); 774 } 775 set_current_state(TASK_RUNNING); 776 dev->wait = NULL; 777 remove_wait_queue(&unlink_wakeup, &wait); 778 } 779 780 int usbnet_stop (struct net_device *net) 781 { 782 struct usbnet *dev = netdev_priv(net); 783 struct driver_info *info = dev->driver_info; 784 int retval; 785 786 clear_bit(EVENT_DEV_OPEN, &dev->flags); 787 netif_stop_queue (net); 788 789 netif_info(dev, ifdown, dev->net, 790 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n", 791 net->stats.rx_packets, net->stats.tx_packets, 792 net->stats.rx_errors, net->stats.tx_errors); 793 794 /* 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 (info->manage_power && 821 !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags)) 822 info->manage_power(dev, 0); 823 else 824 usb_autopm_put_interface(dev->intf); 825 826 return 0; 827 } 828 EXPORT_SYMBOL_GPL(usbnet_stop); 829 830 /*-------------------------------------------------------------------------*/ 831 832 // posts reads, and enables write queuing 833 834 // precondition: never called in_interrupt 835 836 int usbnet_open (struct net_device *net) 837 { 838 struct usbnet *dev = netdev_priv(net); 839 int retval; 840 struct driver_info *info = dev->driver_info; 841 842 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { 843 netif_info(dev, ifup, dev->net, 844 "resumption fail (%d) usbnet usb-%s-%s, %s\n", 845 retval, 846 dev->udev->bus->bus_name, 847 dev->udev->devpath, 848 info->description); 849 goto done_nopm; 850 } 851 852 // put into "known safe" state 853 if (info->reset && (retval = info->reset (dev)) < 0) { 854 netif_info(dev, ifup, dev->net, 855 "open reset fail (%d) usbnet usb-%s-%s, %s\n", 856 retval, 857 dev->udev->bus->bus_name, 858 dev->udev->devpath, 859 info->description); 860 goto done; 861 } 862 863 /* hard_mtu or rx_urb_size may change in reset() */ 864 usbnet_update_max_qlen(dev); 865 866 // insist peer be connected 867 if (info->check_connect && (retval = info->check_connect (dev)) < 0) { 868 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval); 869 goto done; 870 } 871 872 /* start any status interrupt transfer */ 873 if (dev->interrupt) { 874 retval = usbnet_status_start(dev, GFP_KERNEL); 875 if (retval < 0) { 876 netif_err(dev, ifup, dev->net, 877 "intr submit %d\n", retval); 878 goto done; 879 } 880 } 881 882 set_bit(EVENT_DEV_OPEN, &dev->flags); 883 netif_start_queue (net); 884 netif_info(dev, ifup, dev->net, 885 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n", 886 (int)RX_QLEN(dev), (int)TX_QLEN(dev), 887 dev->net->mtu, 888 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" : 889 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" : 890 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" : 891 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" : 892 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" : 893 "simple"); 894 895 /* reset rx error state */ 896 dev->pkt_cnt = 0; 897 dev->pkt_err = 0; 898 clear_bit(EVENT_RX_KILL, &dev->flags); 899 900 // delay posting reads until we're fully open 901 tasklet_schedule (&dev->bh); 902 if (info->manage_power) { 903 retval = info->manage_power(dev, 1); 904 if (retval < 0) { 905 retval = 0; 906 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags); 907 } else { 908 usb_autopm_put_interface(dev->intf); 909 } 910 } 911 return retval; 912 done: 913 usb_autopm_put_interface(dev->intf); 914 done_nopm: 915 return retval; 916 } 917 EXPORT_SYMBOL_GPL(usbnet_open); 918 919 /*-------------------------------------------------------------------------*/ 920 921 /* ethtool methods; minidrivers may need to add some more, but 922 * they'll probably want to use this base set. 923 */ 924 925 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd) 926 { 927 struct usbnet *dev = netdev_priv(net); 928 929 if (!dev->mii.mdio_read) 930 return -EOPNOTSUPP; 931 932 return mii_ethtool_gset(&dev->mii, cmd); 933 } 934 EXPORT_SYMBOL_GPL(usbnet_get_settings); 935 936 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd) 937 { 938 struct usbnet *dev = netdev_priv(net); 939 int retval; 940 941 if (!dev->mii.mdio_write) 942 return -EOPNOTSUPP; 943 944 retval = mii_ethtool_sset(&dev->mii, cmd); 945 946 /* link speed/duplex might have changed */ 947 if (dev->driver_info->link_reset) 948 dev->driver_info->link_reset(dev); 949 950 /* hard_mtu or rx_urb_size may change in link_reset() */ 951 usbnet_update_max_qlen(dev); 952 953 return retval; 954 955 } 956 EXPORT_SYMBOL_GPL(usbnet_set_settings); 957 958 u32 usbnet_get_link (struct net_device *net) 959 { 960 struct usbnet *dev = netdev_priv(net); 961 962 /* If a check_connect is defined, return its result */ 963 if (dev->driver_info->check_connect) 964 return dev->driver_info->check_connect (dev) == 0; 965 966 /* if the device has mii operations, use those */ 967 if (dev->mii.mdio_read) 968 return mii_link_ok(&dev->mii); 969 970 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ 971 return ethtool_op_get_link(net); 972 } 973 EXPORT_SYMBOL_GPL(usbnet_get_link); 974 975 int usbnet_nway_reset(struct net_device *net) 976 { 977 struct usbnet *dev = netdev_priv(net); 978 979 if (!dev->mii.mdio_write) 980 return -EOPNOTSUPP; 981 982 return mii_nway_restart(&dev->mii); 983 } 984 EXPORT_SYMBOL_GPL(usbnet_nway_reset); 985 986 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) 987 { 988 struct usbnet *dev = netdev_priv(net); 989 990 strlcpy (info->driver, dev->driver_name, sizeof info->driver); 991 strlcpy (info->version, DRIVER_VERSION, sizeof info->version); 992 strlcpy (info->fw_version, dev->driver_info->description, 993 sizeof info->fw_version); 994 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); 995 } 996 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); 997 998 u32 usbnet_get_msglevel (struct net_device *net) 999 { 1000 struct usbnet *dev = netdev_priv(net); 1001 1002 return dev->msg_enable; 1003 } 1004 EXPORT_SYMBOL_GPL(usbnet_get_msglevel); 1005 1006 void usbnet_set_msglevel (struct net_device *net, u32 level) 1007 { 1008 struct usbnet *dev = netdev_priv(net); 1009 1010 dev->msg_enable = level; 1011 } 1012 EXPORT_SYMBOL_GPL(usbnet_set_msglevel); 1013 1014 /* drivers may override default ethtool_ops in their bind() routine */ 1015 static const struct ethtool_ops usbnet_ethtool_ops = { 1016 .get_settings = usbnet_get_settings, 1017 .set_settings = usbnet_set_settings, 1018 .get_link = usbnet_get_link, 1019 .nway_reset = usbnet_nway_reset, 1020 .get_drvinfo = usbnet_get_drvinfo, 1021 .get_msglevel = usbnet_get_msglevel, 1022 .set_msglevel = usbnet_set_msglevel, 1023 .get_ts_info = ethtool_op_get_ts_info, 1024 }; 1025 1026 /*-------------------------------------------------------------------------*/ 1027 1028 static void __handle_link_change(struct usbnet *dev) 1029 { 1030 if (!test_bit(EVENT_DEV_OPEN, &dev->flags)) 1031 return; 1032 1033 if (!netif_carrier_ok(dev->net)) { 1034 /* kill URBs for reading packets to save bus bandwidth */ 1035 unlink_urbs(dev, &dev->rxq); 1036 1037 /* 1038 * tx_timeout will unlink URBs for sending packets and 1039 * tx queue is stopped by netcore after link becomes off 1040 */ 1041 } else { 1042 /* submitting URBs for reading packets */ 1043 tasklet_schedule(&dev->bh); 1044 } 1045 1046 /* hard_mtu or rx_urb_size may change during link change */ 1047 usbnet_update_max_qlen(dev); 1048 1049 clear_bit(EVENT_LINK_CHANGE, &dev->flags); 1050 } 1051 1052 /* work that cannot be done in interrupt context uses keventd. 1053 * 1054 * NOTE: with 2.5 we could do more of this using completion callbacks, 1055 * especially now that control transfers can be queued. 1056 */ 1057 static void 1058 kevent (struct work_struct *work) 1059 { 1060 struct usbnet *dev = 1061 container_of(work, struct usbnet, kevent); 1062 int status; 1063 1064 /* usb_clear_halt() needs a thread context */ 1065 if (test_bit (EVENT_TX_HALT, &dev->flags)) { 1066 unlink_urbs (dev, &dev->txq); 1067 status = usb_autopm_get_interface(dev->intf); 1068 if (status < 0) 1069 goto fail_pipe; 1070 status = usb_clear_halt (dev->udev, dev->out); 1071 usb_autopm_put_interface(dev->intf); 1072 if (status < 0 && 1073 status != -EPIPE && 1074 status != -ESHUTDOWN) { 1075 if (netif_msg_tx_err (dev)) 1076 fail_pipe: 1077 netdev_err(dev->net, "can't clear tx halt, status %d\n", 1078 status); 1079 } else { 1080 clear_bit (EVENT_TX_HALT, &dev->flags); 1081 if (status != -ESHUTDOWN) 1082 netif_wake_queue (dev->net); 1083 } 1084 } 1085 if (test_bit (EVENT_RX_HALT, &dev->flags)) { 1086 unlink_urbs (dev, &dev->rxq); 1087 status = usb_autopm_get_interface(dev->intf); 1088 if (status < 0) 1089 goto fail_halt; 1090 status = usb_clear_halt (dev->udev, dev->in); 1091 usb_autopm_put_interface(dev->intf); 1092 if (status < 0 && 1093 status != -EPIPE && 1094 status != -ESHUTDOWN) { 1095 if (netif_msg_rx_err (dev)) 1096 fail_halt: 1097 netdev_err(dev->net, "can't clear rx halt, status %d\n", 1098 status); 1099 } else { 1100 clear_bit (EVENT_RX_HALT, &dev->flags); 1101 tasklet_schedule (&dev->bh); 1102 } 1103 } 1104 1105 /* tasklet could resubmit itself forever if memory is tight */ 1106 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { 1107 struct urb *urb = NULL; 1108 int resched = 1; 1109 1110 if (netif_running (dev->net)) 1111 urb = usb_alloc_urb (0, GFP_KERNEL); 1112 else 1113 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1114 if (urb != NULL) { 1115 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1116 status = usb_autopm_get_interface(dev->intf); 1117 if (status < 0) { 1118 usb_free_urb(urb); 1119 goto fail_lowmem; 1120 } 1121 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) 1122 resched = 0; 1123 usb_autopm_put_interface(dev->intf); 1124 fail_lowmem: 1125 if (resched) 1126 tasklet_schedule (&dev->bh); 1127 } 1128 } 1129 1130 if (test_bit (EVENT_LINK_RESET, &dev->flags)) { 1131 struct driver_info *info = dev->driver_info; 1132 int retval = 0; 1133 1134 clear_bit (EVENT_LINK_RESET, &dev->flags); 1135 status = usb_autopm_get_interface(dev->intf); 1136 if (status < 0) 1137 goto skip_reset; 1138 if(info->link_reset && (retval = info->link_reset(dev)) < 0) { 1139 usb_autopm_put_interface(dev->intf); 1140 skip_reset: 1141 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", 1142 retval, 1143 dev->udev->bus->bus_name, 1144 dev->udev->devpath, 1145 info->description); 1146 } else { 1147 usb_autopm_put_interface(dev->intf); 1148 } 1149 1150 /* handle link change from link resetting */ 1151 __handle_link_change(dev); 1152 } 1153 1154 if (test_bit (EVENT_LINK_CHANGE, &dev->flags)) 1155 __handle_link_change(dev); 1156 1157 if (dev->flags) 1158 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); 1159 } 1160 1161 /*-------------------------------------------------------------------------*/ 1162 1163 static void tx_complete (struct urb *urb) 1164 { 1165 struct sk_buff *skb = (struct sk_buff *) urb->context; 1166 struct skb_data *entry = (struct skb_data *) skb->cb; 1167 struct usbnet *dev = entry->dev; 1168 1169 if (urb->status == 0) { 1170 if (!(dev->driver_info->flags & FLAG_MULTI_PACKET)) 1171 dev->net->stats.tx_packets++; 1172 dev->net->stats.tx_bytes += entry->length; 1173 } else { 1174 dev->net->stats.tx_errors++; 1175 1176 switch (urb->status) { 1177 case -EPIPE: 1178 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1179 break; 1180 1181 /* software-driven interface shutdown */ 1182 case -ECONNRESET: // async unlink 1183 case -ESHUTDOWN: // hardware gone 1184 break; 1185 1186 // like rx, tx gets controller i/o faults during khubd delays 1187 // and so it uses the same throttling mechanism. 1188 case -EPROTO: 1189 case -ETIME: 1190 case -EILSEQ: 1191 usb_mark_last_busy(dev->udev); 1192 if (!timer_pending (&dev->delay)) { 1193 mod_timer (&dev->delay, 1194 jiffies + THROTTLE_JIFFIES); 1195 netif_dbg(dev, link, dev->net, 1196 "tx throttle %d\n", urb->status); 1197 } 1198 netif_stop_queue (dev->net); 1199 break; 1200 default: 1201 netif_dbg(dev, tx_err, dev->net, 1202 "tx err %d\n", entry->urb->status); 1203 break; 1204 } 1205 } 1206 1207 usb_autopm_put_interface_async(dev->intf); 1208 (void) defer_bh(dev, skb, &dev->txq, tx_done); 1209 } 1210 1211 /*-------------------------------------------------------------------------*/ 1212 1213 void usbnet_tx_timeout (struct net_device *net) 1214 { 1215 struct usbnet *dev = netdev_priv(net); 1216 1217 unlink_urbs (dev, &dev->txq); 1218 tasklet_schedule (&dev->bh); 1219 1220 // FIXME: device recovery -- reset? 1221 } 1222 EXPORT_SYMBOL_GPL(usbnet_tx_timeout); 1223 1224 /*-------------------------------------------------------------------------*/ 1225 1226 static int build_dma_sg(const struct sk_buff *skb, struct urb *urb) 1227 { 1228 unsigned num_sgs, total_len = 0; 1229 int i, s = 0; 1230 1231 num_sgs = skb_shinfo(skb)->nr_frags + 1; 1232 if (num_sgs == 1) 1233 return 0; 1234 1235 /* reserve one for zero packet */ 1236 urb->sg = kmalloc((num_sgs + 1) * sizeof(struct scatterlist), 1237 GFP_ATOMIC); 1238 if (!urb->sg) 1239 return -ENOMEM; 1240 1241 urb->num_sgs = num_sgs; 1242 sg_init_table(urb->sg, urb->num_sgs + 1); 1243 1244 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb)); 1245 total_len += skb_headlen(skb); 1246 1247 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1248 struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i]; 1249 1250 total_len += skb_frag_size(f); 1251 sg_set_page(&urb->sg[i + s], f->page.p, f->size, 1252 f->page_offset); 1253 } 1254 urb->transfer_buffer_length = total_len; 1255 1256 return 1; 1257 } 1258 1259 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, 1260 struct net_device *net) 1261 { 1262 struct usbnet *dev = netdev_priv(net); 1263 int length; 1264 struct urb *urb = NULL; 1265 struct skb_data *entry; 1266 struct driver_info *info = dev->driver_info; 1267 unsigned long flags; 1268 int retval; 1269 1270 if (skb) 1271 skb_tx_timestamp(skb); 1272 1273 // some devices want funky USB-level framing, for 1274 // win32 driver (usually) and/or hardware quirks 1275 if (info->tx_fixup) { 1276 skb = info->tx_fixup (dev, skb, GFP_ATOMIC); 1277 if (!skb) { 1278 /* packet collected; minidriver waiting for more */ 1279 if (info->flags & FLAG_MULTI_PACKET) 1280 goto not_drop; 1281 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); 1282 goto drop; 1283 } 1284 } 1285 1286 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { 1287 netif_dbg(dev, tx_err, dev->net, "no urb\n"); 1288 goto drop; 1289 } 1290 1291 entry = (struct skb_data *) skb->cb; 1292 entry->urb = urb; 1293 entry->dev = dev; 1294 1295 usb_fill_bulk_urb (urb, dev->udev, dev->out, 1296 skb->data, skb->len, tx_complete, skb); 1297 if (dev->can_dma_sg) { 1298 if (build_dma_sg(skb, urb) < 0) 1299 goto drop; 1300 } 1301 length = urb->transfer_buffer_length; 1302 1303 /* don't assume the hardware handles USB_ZERO_PACKET 1304 * NOTE: strictly conforming cdc-ether devices should expect 1305 * the ZLP here, but ignore the one-byte packet. 1306 * NOTE2: CDC NCM specification is different from CDC ECM when 1307 * handling ZLP/short packets, so cdc_ncm driver will make short 1308 * packet itself if needed. 1309 */ 1310 if (length % dev->maxpacket == 0) { 1311 if (!(info->flags & FLAG_SEND_ZLP)) { 1312 if (!(info->flags & FLAG_MULTI_PACKET)) { 1313 length++; 1314 if (skb_tailroom(skb) && !urb->num_sgs) { 1315 skb->data[skb->len] = 0; 1316 __skb_put(skb, 1); 1317 } else if (urb->num_sgs) 1318 sg_set_buf(&urb->sg[urb->num_sgs++], 1319 dev->padding_pkt, 1); 1320 } 1321 } else 1322 urb->transfer_flags |= URB_ZERO_PACKET; 1323 } 1324 entry->length = urb->transfer_buffer_length = length; 1325 1326 spin_lock_irqsave(&dev->txq.lock, flags); 1327 retval = usb_autopm_get_interface_async(dev->intf); 1328 if (retval < 0) { 1329 spin_unlock_irqrestore(&dev->txq.lock, flags); 1330 goto drop; 1331 } 1332 1333 #ifdef CONFIG_PM 1334 /* if this triggers the device is still a sleep */ 1335 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { 1336 /* transmission will be done in resume */ 1337 usb_anchor_urb(urb, &dev->deferred); 1338 /* no use to process more packets */ 1339 netif_stop_queue(net); 1340 usb_put_urb(urb); 1341 spin_unlock_irqrestore(&dev->txq.lock, flags); 1342 netdev_dbg(dev->net, "Delaying transmission for resumption\n"); 1343 goto deferred; 1344 } 1345 #endif 1346 1347 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { 1348 case -EPIPE: 1349 netif_stop_queue (net); 1350 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1351 usb_autopm_put_interface_async(dev->intf); 1352 break; 1353 default: 1354 usb_autopm_put_interface_async(dev->intf); 1355 netif_dbg(dev, tx_err, dev->net, 1356 "tx: submit urb err %d\n", retval); 1357 break; 1358 case 0: 1359 net->trans_start = jiffies; 1360 __usbnet_queue_skb(&dev->txq, skb, tx_start); 1361 if (dev->txq.qlen >= TX_QLEN (dev)) 1362 netif_stop_queue (net); 1363 } 1364 spin_unlock_irqrestore (&dev->txq.lock, flags); 1365 1366 if (retval) { 1367 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); 1368 drop: 1369 dev->net->stats.tx_dropped++; 1370 not_drop: 1371 if (skb) 1372 dev_kfree_skb_any (skb); 1373 if (urb) { 1374 kfree(urb->sg); 1375 usb_free_urb(urb); 1376 } 1377 } else 1378 netif_dbg(dev, tx_queued, dev->net, 1379 "> tx, len %d, type 0x%x\n", length, skb->protocol); 1380 #ifdef CONFIG_PM 1381 deferred: 1382 #endif 1383 return NETDEV_TX_OK; 1384 } 1385 EXPORT_SYMBOL_GPL(usbnet_start_xmit); 1386 1387 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags) 1388 { 1389 struct urb *urb; 1390 int i; 1391 int ret = 0; 1392 1393 /* don't refill the queue all at once */ 1394 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) { 1395 urb = usb_alloc_urb(0, flags); 1396 if (urb != NULL) { 1397 ret = rx_submit(dev, urb, flags); 1398 if (ret) 1399 goto err; 1400 } else { 1401 ret = -ENOMEM; 1402 goto err; 1403 } 1404 } 1405 err: 1406 return ret; 1407 } 1408 1409 /*-------------------------------------------------------------------------*/ 1410 1411 // tasklet (work deferred from completions, in_irq) or timer 1412 1413 static void usbnet_bh (unsigned long param) 1414 { 1415 struct usbnet *dev = (struct usbnet *) param; 1416 struct sk_buff *skb; 1417 struct skb_data *entry; 1418 1419 while ((skb = skb_dequeue (&dev->done))) { 1420 entry = (struct skb_data *) skb->cb; 1421 switch (entry->state) { 1422 case rx_done: 1423 entry->state = rx_cleanup; 1424 rx_process (dev, skb); 1425 continue; 1426 case tx_done: 1427 kfree(entry->urb->sg); 1428 case rx_cleanup: 1429 usb_free_urb (entry->urb); 1430 dev_kfree_skb (skb); 1431 continue; 1432 default: 1433 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); 1434 } 1435 } 1436 1437 /* restart RX again after disabling due to high error rate */ 1438 clear_bit(EVENT_RX_KILL, &dev->flags); 1439 1440 // waiting for all pending urbs to complete? 1441 if (dev->wait) { 1442 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) { 1443 wake_up (dev->wait); 1444 } 1445 1446 // or are we maybe short a few urbs? 1447 } else if (netif_running (dev->net) && 1448 netif_device_present (dev->net) && 1449 netif_carrier_ok(dev->net) && 1450 !timer_pending (&dev->delay) && 1451 !test_bit (EVENT_RX_HALT, &dev->flags)) { 1452 int temp = dev->rxq.qlen; 1453 1454 if (temp < RX_QLEN(dev)) { 1455 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK) 1456 return; 1457 if (temp != dev->rxq.qlen) 1458 netif_dbg(dev, link, dev->net, 1459 "rxqlen %d --> %d\n", 1460 temp, dev->rxq.qlen); 1461 if (dev->rxq.qlen < RX_QLEN(dev)) 1462 tasklet_schedule (&dev->bh); 1463 } 1464 if (dev->txq.qlen < TX_QLEN (dev)) 1465 netif_wake_queue (dev->net); 1466 } 1467 } 1468 1469 1470 /*------------------------------------------------------------------------- 1471 * 1472 * USB Device Driver support 1473 * 1474 *-------------------------------------------------------------------------*/ 1475 1476 // precondition: never called in_interrupt 1477 1478 void usbnet_disconnect (struct usb_interface *intf) 1479 { 1480 struct usbnet *dev; 1481 struct usb_device *xdev; 1482 struct net_device *net; 1483 1484 dev = usb_get_intfdata(intf); 1485 usb_set_intfdata(intf, NULL); 1486 if (!dev) 1487 return; 1488 1489 xdev = interface_to_usbdev (intf); 1490 1491 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", 1492 intf->dev.driver->name, 1493 xdev->bus->bus_name, xdev->devpath, 1494 dev->driver_info->description); 1495 1496 net = dev->net; 1497 unregister_netdev (net); 1498 1499 cancel_work_sync(&dev->kevent); 1500 1501 usb_scuttle_anchored_urbs(&dev->deferred); 1502 1503 if (dev->driver_info->unbind) 1504 dev->driver_info->unbind (dev, intf); 1505 1506 usb_kill_urb(dev->interrupt); 1507 usb_free_urb(dev->interrupt); 1508 kfree(dev->padding_pkt); 1509 1510 free_netdev(net); 1511 } 1512 EXPORT_SYMBOL_GPL(usbnet_disconnect); 1513 1514 static const struct net_device_ops usbnet_netdev_ops = { 1515 .ndo_open = usbnet_open, 1516 .ndo_stop = usbnet_stop, 1517 .ndo_start_xmit = usbnet_start_xmit, 1518 .ndo_tx_timeout = usbnet_tx_timeout, 1519 .ndo_change_mtu = usbnet_change_mtu, 1520 .ndo_set_mac_address = eth_mac_addr, 1521 .ndo_validate_addr = eth_validate_addr, 1522 }; 1523 1524 /*-------------------------------------------------------------------------*/ 1525 1526 // precondition: never called in_interrupt 1527 1528 static struct device_type wlan_type = { 1529 .name = "wlan", 1530 }; 1531 1532 static struct device_type wwan_type = { 1533 .name = "wwan", 1534 }; 1535 1536 int 1537 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) 1538 { 1539 struct usbnet *dev; 1540 struct net_device *net; 1541 struct usb_host_interface *interface; 1542 struct driver_info *info; 1543 struct usb_device *xdev; 1544 int status; 1545 const char *name; 1546 struct usb_driver *driver = to_usb_driver(udev->dev.driver); 1547 1548 /* usbnet already took usb runtime pm, so have to enable the feature 1549 * for usb interface, otherwise usb_autopm_get_interface may return 1550 * failure if RUNTIME_PM is enabled. 1551 */ 1552 if (!driver->supports_autosuspend) { 1553 driver->supports_autosuspend = 1; 1554 pm_runtime_enable(&udev->dev); 1555 } 1556 1557 name = udev->dev.driver->name; 1558 info = (struct driver_info *) prod->driver_info; 1559 if (!info) { 1560 dev_dbg (&udev->dev, "blacklisted by %s\n", name); 1561 return -ENODEV; 1562 } 1563 xdev = interface_to_usbdev (udev); 1564 interface = udev->cur_altsetting; 1565 1566 status = -ENOMEM; 1567 1568 // set up our own records 1569 net = alloc_etherdev(sizeof(*dev)); 1570 if (!net) 1571 goto out; 1572 1573 /* netdev_printk() needs this so do it as early as possible */ 1574 SET_NETDEV_DEV(net, &udev->dev); 1575 1576 dev = netdev_priv(net); 1577 dev->udev = xdev; 1578 dev->intf = udev; 1579 dev->driver_info = info; 1580 dev->driver_name = name; 1581 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV 1582 | NETIF_MSG_PROBE | NETIF_MSG_LINK); 1583 skb_queue_head_init (&dev->rxq); 1584 skb_queue_head_init (&dev->txq); 1585 skb_queue_head_init (&dev->done); 1586 skb_queue_head_init(&dev->rxq_pause); 1587 dev->bh.func = usbnet_bh; 1588 dev->bh.data = (unsigned long) dev; 1589 INIT_WORK (&dev->kevent, kevent); 1590 init_usb_anchor(&dev->deferred); 1591 dev->delay.function = usbnet_bh; 1592 dev->delay.data = (unsigned long) dev; 1593 init_timer (&dev->delay); 1594 mutex_init (&dev->phy_mutex); 1595 mutex_init(&dev->interrupt_mutex); 1596 dev->interrupt_count = 0; 1597 1598 dev->net = net; 1599 strcpy (net->name, "usb%d"); 1600 memcpy (net->dev_addr, node_id, sizeof node_id); 1601 1602 /* rx and tx sides can use different message sizes; 1603 * bind() should set rx_urb_size in that case. 1604 */ 1605 dev->hard_mtu = net->mtu + net->hard_header_len; 1606 #if 0 1607 // dma_supported() is deeply broken on almost all architectures 1608 // possible with some EHCI controllers 1609 if (dma_supported (&udev->dev, DMA_BIT_MASK(64))) 1610 net->features |= NETIF_F_HIGHDMA; 1611 #endif 1612 1613 net->netdev_ops = &usbnet_netdev_ops; 1614 net->watchdog_timeo = TX_TIMEOUT_JIFFIES; 1615 net->ethtool_ops = &usbnet_ethtool_ops; 1616 1617 // allow device-specific bind/init procedures 1618 // NOTE net->name still not usable ... 1619 if (info->bind) { 1620 status = info->bind (dev, udev); 1621 if (status < 0) 1622 goto out1; 1623 1624 // heuristic: "usb%d" for links we know are two-host, 1625 // else "eth%d" when there's reasonable doubt. userspace 1626 // can rename the link if it knows better. 1627 if ((dev->driver_info->flags & FLAG_ETHER) != 0 && 1628 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 || 1629 (net->dev_addr [0] & 0x02) == 0)) 1630 strcpy (net->name, "eth%d"); 1631 /* WLAN devices should always be named "wlan%d" */ 1632 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1633 strcpy(net->name, "wlan%d"); 1634 /* WWAN devices should always be named "wwan%d" */ 1635 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1636 strcpy(net->name, "wwan%d"); 1637 1638 /* devices that cannot do ARP */ 1639 if ((dev->driver_info->flags & FLAG_NOARP) != 0) 1640 net->flags |= IFF_NOARP; 1641 1642 /* maybe the remote can't receive an Ethernet MTU */ 1643 if (net->mtu > (dev->hard_mtu - net->hard_header_len)) 1644 net->mtu = dev->hard_mtu - net->hard_header_len; 1645 } else if (!info->in || !info->out) 1646 status = usbnet_get_endpoints (dev, udev); 1647 else { 1648 dev->in = usb_rcvbulkpipe (xdev, info->in); 1649 dev->out = usb_sndbulkpipe (xdev, info->out); 1650 if (!(info->flags & FLAG_NO_SETINT)) 1651 status = usb_set_interface (xdev, 1652 interface->desc.bInterfaceNumber, 1653 interface->desc.bAlternateSetting); 1654 else 1655 status = 0; 1656 1657 } 1658 if (status >= 0 && dev->status) 1659 status = init_status (dev, udev); 1660 if (status < 0) 1661 goto out3; 1662 1663 if (!dev->rx_urb_size) 1664 dev->rx_urb_size = dev->hard_mtu; 1665 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); 1666 1667 /* let userspace know we have a random address */ 1668 if (ether_addr_equal(net->dev_addr, node_id)) 1669 net->addr_assign_type = NET_ADDR_RANDOM; 1670 1671 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1672 SET_NETDEV_DEVTYPE(net, &wlan_type); 1673 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1674 SET_NETDEV_DEVTYPE(net, &wwan_type); 1675 1676 /* initialize max rx_qlen and tx_qlen */ 1677 usbnet_update_max_qlen(dev); 1678 1679 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) && 1680 !(info->flags & FLAG_MULTI_PACKET)) { 1681 dev->padding_pkt = kzalloc(1, GFP_KERNEL); 1682 if (!dev->padding_pkt) { 1683 status = -ENOMEM; 1684 goto out4; 1685 } 1686 } 1687 1688 status = register_netdev (net); 1689 if (status) 1690 goto out5; 1691 netif_info(dev, probe, dev->net, 1692 "register '%s' at usb-%s-%s, %s, %pM\n", 1693 udev->dev.driver->name, 1694 xdev->bus->bus_name, xdev->devpath, 1695 dev->driver_info->description, 1696 net->dev_addr); 1697 1698 // ok, it's ready to go. 1699 usb_set_intfdata (udev, dev); 1700 1701 netif_device_attach (net); 1702 1703 if (dev->driver_info->flags & FLAG_LINK_INTR) 1704 usbnet_link_change(dev, 0, 0); 1705 1706 return 0; 1707 1708 out5: 1709 kfree(dev->padding_pkt); 1710 out4: 1711 usb_free_urb(dev->interrupt); 1712 out3: 1713 if (info->unbind) 1714 info->unbind (dev, udev); 1715 out1: 1716 free_netdev(net); 1717 out: 1718 return status; 1719 } 1720 EXPORT_SYMBOL_GPL(usbnet_probe); 1721 1722 /*-------------------------------------------------------------------------*/ 1723 1724 /* 1725 * suspend the whole driver as soon as the first interface is suspended 1726 * resume only when the last interface is resumed 1727 */ 1728 1729 int usbnet_suspend (struct usb_interface *intf, pm_message_t message) 1730 { 1731 struct usbnet *dev = usb_get_intfdata(intf); 1732 1733 if (!dev->suspend_count++) { 1734 spin_lock_irq(&dev->txq.lock); 1735 /* don't autosuspend while transmitting */ 1736 if (dev->txq.qlen && PMSG_IS_AUTO(message)) { 1737 dev->suspend_count--; 1738 spin_unlock_irq(&dev->txq.lock); 1739 return -EBUSY; 1740 } else { 1741 set_bit(EVENT_DEV_ASLEEP, &dev->flags); 1742 spin_unlock_irq(&dev->txq.lock); 1743 } 1744 /* 1745 * accelerate emptying of the rx and queues, to avoid 1746 * having everything error out. 1747 */ 1748 netif_device_detach (dev->net); 1749 usbnet_terminate_urbs(dev); 1750 __usbnet_status_stop_force(dev); 1751 1752 /* 1753 * reattach so runtime management can use and 1754 * wake the device 1755 */ 1756 netif_device_attach (dev->net); 1757 } 1758 return 0; 1759 } 1760 EXPORT_SYMBOL_GPL(usbnet_suspend); 1761 1762 int usbnet_resume (struct usb_interface *intf) 1763 { 1764 struct usbnet *dev = usb_get_intfdata(intf); 1765 struct sk_buff *skb; 1766 struct urb *res; 1767 int retval; 1768 1769 if (!--dev->suspend_count) { 1770 /* resume interrupt URB if it was previously submitted */ 1771 __usbnet_status_start_force(dev, GFP_NOIO); 1772 1773 spin_lock_irq(&dev->txq.lock); 1774 while ((res = usb_get_from_anchor(&dev->deferred))) { 1775 1776 skb = (struct sk_buff *)res->context; 1777 retval = usb_submit_urb(res, GFP_ATOMIC); 1778 if (retval < 0) { 1779 dev_kfree_skb_any(skb); 1780 kfree(res->sg); 1781 usb_free_urb(res); 1782 usb_autopm_put_interface_async(dev->intf); 1783 } else { 1784 dev->net->trans_start = jiffies; 1785 __skb_queue_tail(&dev->txq, skb); 1786 } 1787 } 1788 1789 smp_mb(); 1790 clear_bit(EVENT_DEV_ASLEEP, &dev->flags); 1791 spin_unlock_irq(&dev->txq.lock); 1792 1793 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) { 1794 /* handle remote wakeup ASAP */ 1795 if (!dev->wait && 1796 netif_device_present(dev->net) && 1797 !timer_pending(&dev->delay) && 1798 !test_bit(EVENT_RX_HALT, &dev->flags)) 1799 rx_alloc_submit(dev, GFP_NOIO); 1800 1801 if (!(dev->txq.qlen >= TX_QLEN(dev))) 1802 netif_tx_wake_all_queues(dev->net); 1803 tasklet_schedule (&dev->bh); 1804 } 1805 } 1806 1807 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) 1808 usb_autopm_get_interface_no_resume(intf); 1809 1810 return 0; 1811 } 1812 EXPORT_SYMBOL_GPL(usbnet_resume); 1813 1814 /* 1815 * Either a subdriver implements manage_power, then it is assumed to always 1816 * be ready to be suspended or it reports the readiness to be suspended 1817 * explicitly 1818 */ 1819 void usbnet_device_suggests_idle(struct usbnet *dev) 1820 { 1821 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) { 1822 dev->intf->needs_remote_wakeup = 1; 1823 usb_autopm_put_interface_async(dev->intf); 1824 } 1825 } 1826 EXPORT_SYMBOL(usbnet_device_suggests_idle); 1827 1828 /* 1829 * For devices that can do without special commands 1830 */ 1831 int usbnet_manage_power(struct usbnet *dev, int on) 1832 { 1833 dev->intf->needs_remote_wakeup = on; 1834 return 0; 1835 } 1836 EXPORT_SYMBOL(usbnet_manage_power); 1837 1838 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset) 1839 { 1840 /* update link after link is reseted */ 1841 if (link && !need_reset) 1842 netif_carrier_on(dev->net); 1843 else 1844 netif_carrier_off(dev->net); 1845 1846 if (need_reset && link) 1847 usbnet_defer_kevent(dev, EVENT_LINK_RESET); 1848 else 1849 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE); 1850 } 1851 EXPORT_SYMBOL(usbnet_link_change); 1852 1853 /*-------------------------------------------------------------------------*/ 1854 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1855 u16 value, u16 index, void *data, u16 size) 1856 { 1857 void *buf = NULL; 1858 int err = -ENOMEM; 1859 1860 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x" 1861 " value=0x%04x index=0x%04x size=%d\n", 1862 cmd, reqtype, value, index, size); 1863 1864 if (data) { 1865 buf = kmalloc(size, GFP_KERNEL); 1866 if (!buf) 1867 goto out; 1868 } 1869 1870 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), 1871 cmd, reqtype, value, index, buf, size, 1872 USB_CTRL_GET_TIMEOUT); 1873 if (err > 0 && err <= size) 1874 memcpy(data, buf, err); 1875 kfree(buf); 1876 out: 1877 return err; 1878 } 1879 1880 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1881 u16 value, u16 index, const void *data, 1882 u16 size) 1883 { 1884 void *buf = NULL; 1885 int err = -ENOMEM; 1886 1887 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 1888 " value=0x%04x index=0x%04x size=%d\n", 1889 cmd, reqtype, value, index, size); 1890 1891 if (data) { 1892 buf = kmemdup(data, size, GFP_KERNEL); 1893 if (!buf) 1894 goto out; 1895 } 1896 1897 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), 1898 cmd, reqtype, value, index, buf, size, 1899 USB_CTRL_SET_TIMEOUT); 1900 kfree(buf); 1901 1902 out: 1903 return err; 1904 } 1905 1906 /* 1907 * The function can't be called inside suspend/resume callback, 1908 * otherwise deadlock will be caused. 1909 */ 1910 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1911 u16 value, u16 index, void *data, u16 size) 1912 { 1913 int ret; 1914 1915 if (usb_autopm_get_interface(dev->intf) < 0) 1916 return -ENODEV; 1917 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index, 1918 data, size); 1919 usb_autopm_put_interface(dev->intf); 1920 return ret; 1921 } 1922 EXPORT_SYMBOL_GPL(usbnet_read_cmd); 1923 1924 /* 1925 * The function can't be called inside suspend/resume callback, 1926 * otherwise deadlock will be caused. 1927 */ 1928 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1929 u16 value, u16 index, const void *data, u16 size) 1930 { 1931 int ret; 1932 1933 if (usb_autopm_get_interface(dev->intf) < 0) 1934 return -ENODEV; 1935 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index, 1936 data, size); 1937 usb_autopm_put_interface(dev->intf); 1938 return ret; 1939 } 1940 EXPORT_SYMBOL_GPL(usbnet_write_cmd); 1941 1942 /* 1943 * The function can be called inside suspend/resume callback safely 1944 * and should only be called by suspend/resume callback generally. 1945 */ 1946 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 1947 u16 value, u16 index, void *data, u16 size) 1948 { 1949 return __usbnet_read_cmd(dev, cmd, reqtype, value, index, 1950 data, size); 1951 } 1952 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm); 1953 1954 /* 1955 * The function can be called inside suspend/resume callback safely 1956 * and should only be called by suspend/resume callback generally. 1957 */ 1958 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 1959 u16 value, u16 index, const void *data, 1960 u16 size) 1961 { 1962 return __usbnet_write_cmd(dev, cmd, reqtype, value, index, 1963 data, size); 1964 } 1965 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm); 1966 1967 static void usbnet_async_cmd_cb(struct urb *urb) 1968 { 1969 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context; 1970 int status = urb->status; 1971 1972 if (status < 0) 1973 dev_dbg(&urb->dev->dev, "%s failed with %d", 1974 __func__, status); 1975 1976 kfree(req); 1977 usb_free_urb(urb); 1978 } 1979 1980 /* 1981 * The caller must make sure that device can't be put into suspend 1982 * state until the control URB completes. 1983 */ 1984 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype, 1985 u16 value, u16 index, const void *data, u16 size) 1986 { 1987 struct usb_ctrlrequest *req = NULL; 1988 struct urb *urb; 1989 int err = -ENOMEM; 1990 void *buf = NULL; 1991 1992 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 1993 " value=0x%04x index=0x%04x size=%d\n", 1994 cmd, reqtype, value, index, size); 1995 1996 urb = usb_alloc_urb(0, GFP_ATOMIC); 1997 if (!urb) { 1998 netdev_err(dev->net, "Error allocating URB in" 1999 " %s!\n", __func__); 2000 goto fail; 2001 } 2002 2003 if (data) { 2004 buf = kmemdup(data, size, GFP_ATOMIC); 2005 if (!buf) { 2006 netdev_err(dev->net, "Error allocating buffer" 2007 " in %s!\n", __func__); 2008 goto fail_free; 2009 } 2010 } 2011 2012 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC); 2013 if (!req) 2014 goto fail_free_buf; 2015 2016 req->bRequestType = reqtype; 2017 req->bRequest = cmd; 2018 req->wValue = cpu_to_le16(value); 2019 req->wIndex = cpu_to_le16(index); 2020 req->wLength = cpu_to_le16(size); 2021 2022 usb_fill_control_urb(urb, dev->udev, 2023 usb_sndctrlpipe(dev->udev, 0), 2024 (void *)req, buf, size, 2025 usbnet_async_cmd_cb, req); 2026 urb->transfer_flags |= URB_FREE_BUFFER; 2027 2028 err = usb_submit_urb(urb, GFP_ATOMIC); 2029 if (err < 0) { 2030 netdev_err(dev->net, "Error submitting the control" 2031 " message: status=%d\n", err); 2032 goto fail_free; 2033 } 2034 return 0; 2035 2036 fail_free_buf: 2037 kfree(buf); 2038 fail_free: 2039 kfree(req); 2040 usb_free_urb(urb); 2041 fail: 2042 return err; 2043 2044 } 2045 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async); 2046 /*-------------------------------------------------------------------------*/ 2047 2048 static int __init usbnet_init(void) 2049 { 2050 /* Compiler should optimize this out. */ 2051 BUILD_BUG_ON( 2052 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data)); 2053 2054 eth_random_addr(node_id); 2055 return 0; 2056 } 2057 module_init(usbnet_init); 2058 2059 static void __exit usbnet_exit(void) 2060 { 2061 } 2062 module_exit(usbnet_exit); 2063 2064 MODULE_AUTHOR("David Brownell"); 2065 MODULE_DESCRIPTION("USB network driver framework"); 2066 MODULE_LICENSE("GPL"); 2067