1 /* 2 * USB Network driver infrastructure 3 * Copyright (C) 2000-2005 by David Brownell 4 * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 */ 20 21 /* 22 * This is a generic "USB networking" framework that works with several 23 * kinds of full and high speed networking devices: host-to-host cables, 24 * smart usb peripherals, and actual Ethernet adapters. 25 * 26 * These devices usually differ in terms of control protocols (if they 27 * even have one!) and sometimes they define new framing to wrap or batch 28 * Ethernet packets. Otherwise, they talk to USB pretty much the same, 29 * so interface (un)binding, endpoint I/O queues, fault handling, and other 30 * issues can usefully be addressed by this framework. 31 */ 32 33 // #define DEBUG // error path messages, extra info 34 // #define VERBOSE // more; success messages 35 36 #include <linux/module.h> 37 #include <linux/init.h> 38 #include <linux/netdevice.h> 39 #include <linux/etherdevice.h> 40 #include <linux/ctype.h> 41 #include <linux/ethtool.h> 42 #include <linux/workqueue.h> 43 #include <linux/mii.h> 44 #include <linux/usb.h> 45 #include <linux/usb/usbnet.h> 46 #include <linux/slab.h> 47 #include <linux/kernel.h> 48 #include <linux/pm_runtime.h> 49 50 #define DRIVER_VERSION "22-Aug-2005" 51 52 53 /*-------------------------------------------------------------------------*/ 54 55 /* 56 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max. 57 * Several dozen bytes of IPv4 data can fit in two such transactions. 58 * One maximum size Ethernet packet takes twenty four of them. 59 * For high speed, each frame comfortably fits almost 36 max size 60 * Ethernet packets (so queues should be bigger). 61 * 62 * The goal is to let the USB host controller be busy for 5msec or 63 * more before an irq is required, under load. Jumbograms change 64 * the equation. 65 */ 66 #define MAX_QUEUE_MEMORY (60 * 1518) 67 #define RX_QLEN(dev) ((dev)->rx_qlen) 68 #define TX_QLEN(dev) ((dev)->tx_qlen) 69 70 // reawaken network queue this soon after stopping; else watchdog barks 71 #define TX_TIMEOUT_JIFFIES (5*HZ) 72 73 // throttle rx/tx briefly after some faults, so khubd might disconnect() 74 // us (it polls at HZ/4 usually) before we report too many false errors. 75 #define THROTTLE_JIFFIES (HZ/8) 76 77 // between wakeups 78 #define UNLINK_TIMEOUT_MS 3 79 80 /*-------------------------------------------------------------------------*/ 81 82 // randomly generated ethernet address 83 static u8 node_id [ETH_ALEN]; 84 85 static const char driver_name [] = "usbnet"; 86 87 /* use ethtool to change the level for any given device */ 88 static int msg_level = -1; 89 module_param (msg_level, int, 0); 90 MODULE_PARM_DESC (msg_level, "Override default message level"); 91 92 /*-------------------------------------------------------------------------*/ 93 94 /* handles CDC Ethernet and many other network "bulk data" interfaces */ 95 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf) 96 { 97 int tmp; 98 struct usb_host_interface *alt = NULL; 99 struct usb_host_endpoint *in = NULL, *out = NULL; 100 struct usb_host_endpoint *status = NULL; 101 102 for (tmp = 0; tmp < intf->num_altsetting; tmp++) { 103 unsigned ep; 104 105 in = out = status = NULL; 106 alt = intf->altsetting + tmp; 107 108 /* take the first altsetting with in-bulk + out-bulk; 109 * remember any status endpoint, just in case; 110 * ignore other endpoints and altsettings. 111 */ 112 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) { 113 struct usb_host_endpoint *e; 114 int intr = 0; 115 116 e = alt->endpoint + ep; 117 switch (e->desc.bmAttributes) { 118 case USB_ENDPOINT_XFER_INT: 119 if (!usb_endpoint_dir_in(&e->desc)) 120 continue; 121 intr = 1; 122 /* FALLTHROUGH */ 123 case USB_ENDPOINT_XFER_BULK: 124 break; 125 default: 126 continue; 127 } 128 if (usb_endpoint_dir_in(&e->desc)) { 129 if (!intr && !in) 130 in = e; 131 else if (intr && !status) 132 status = e; 133 } else { 134 if (!out) 135 out = e; 136 } 137 } 138 if (in && out) 139 break; 140 } 141 if (!alt || !in || !out) 142 return -EINVAL; 143 144 if (alt->desc.bAlternateSetting != 0 || 145 !(dev->driver_info->flags & FLAG_NO_SETINT)) { 146 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber, 147 alt->desc.bAlternateSetting); 148 if (tmp < 0) 149 return tmp; 150 } 151 152 dev->in = usb_rcvbulkpipe (dev->udev, 153 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 154 dev->out = usb_sndbulkpipe (dev->udev, 155 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 156 dev->status = status; 157 return 0; 158 } 159 EXPORT_SYMBOL_GPL(usbnet_get_endpoints); 160 161 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress) 162 { 163 int tmp, i; 164 unsigned char buf [13]; 165 166 tmp = usb_string(dev->udev, iMACAddress, buf, sizeof buf); 167 if (tmp != 12) { 168 dev_dbg(&dev->udev->dev, 169 "bad MAC string %d fetch, %d\n", iMACAddress, tmp); 170 if (tmp >= 0) 171 tmp = -EINVAL; 172 return tmp; 173 } 174 for (i = tmp = 0; i < 6; i++, tmp += 2) 175 dev->net->dev_addr [i] = 176 (hex_to_bin(buf[tmp]) << 4) + hex_to_bin(buf[tmp + 1]); 177 return 0; 178 } 179 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr); 180 181 static void intr_complete (struct urb *urb) 182 { 183 struct usbnet *dev = urb->context; 184 int status = urb->status; 185 186 switch (status) { 187 /* success */ 188 case 0: 189 dev->driver_info->status(dev, urb); 190 break; 191 192 /* software-driven interface shutdown */ 193 case -ENOENT: /* urb killed */ 194 case -ESHUTDOWN: /* hardware gone */ 195 netif_dbg(dev, ifdown, dev->net, 196 "intr shutdown, code %d\n", status); 197 return; 198 199 /* NOTE: not throttling like RX/TX, since this endpoint 200 * already polls infrequently 201 */ 202 default: 203 netdev_dbg(dev->net, "intr status %d\n", status); 204 break; 205 } 206 207 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 if (skb->len) { 547 /* all data was already cloned from skb inside the driver */ 548 if (dev->driver_info->flags & FLAG_MULTI_PACKET) 549 dev_kfree_skb_any(skb); 550 else 551 usbnet_skb_return(dev, skb); 552 return; 553 } 554 555 netif_dbg(dev, rx_err, dev->net, "drop\n"); 556 dev->net->stats.rx_errors++; 557 done: 558 skb_queue_tail(&dev->done, skb); 559 } 560 561 /*-------------------------------------------------------------------------*/ 562 563 static void rx_complete (struct urb *urb) 564 { 565 struct sk_buff *skb = (struct sk_buff *) urb->context; 566 struct skb_data *entry = (struct skb_data *) skb->cb; 567 struct usbnet *dev = entry->dev; 568 int urb_status = urb->status; 569 enum skb_state state; 570 571 skb_put (skb, urb->actual_length); 572 state = rx_done; 573 entry->urb = NULL; 574 575 switch (urb_status) { 576 /* success */ 577 case 0: 578 if (skb->len < dev->net->hard_header_len) { 579 state = rx_cleanup; 580 dev->net->stats.rx_errors++; 581 dev->net->stats.rx_length_errors++; 582 netif_dbg(dev, rx_err, dev->net, 583 "rx length %d\n", skb->len); 584 } 585 break; 586 587 /* stalls need manual reset. this is rare ... except that 588 * when going through USB 2.0 TTs, unplug appears this way. 589 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ 590 * storm, recovering as needed. 591 */ 592 case -EPIPE: 593 dev->net->stats.rx_errors++; 594 usbnet_defer_kevent (dev, EVENT_RX_HALT); 595 // FALLTHROUGH 596 597 /* software-driven interface shutdown */ 598 case -ECONNRESET: /* async unlink */ 599 case -ESHUTDOWN: /* hardware gone */ 600 netif_dbg(dev, ifdown, dev->net, 601 "rx shutdown, code %d\n", urb_status); 602 goto block; 603 604 /* we get controller i/o faults during khubd disconnect() delays. 605 * throttle down resubmits, to avoid log floods; just temporarily, 606 * so we still recover when the fault isn't a khubd delay. 607 */ 608 case -EPROTO: 609 case -ETIME: 610 case -EILSEQ: 611 dev->net->stats.rx_errors++; 612 if (!timer_pending (&dev->delay)) { 613 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); 614 netif_dbg(dev, link, dev->net, 615 "rx throttle %d\n", urb_status); 616 } 617 block: 618 state = rx_cleanup; 619 entry->urb = urb; 620 urb = NULL; 621 break; 622 623 /* data overrun ... flush fifo? */ 624 case -EOVERFLOW: 625 dev->net->stats.rx_over_errors++; 626 // FALLTHROUGH 627 628 default: 629 state = rx_cleanup; 630 dev->net->stats.rx_errors++; 631 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status); 632 break; 633 } 634 635 /* stop rx if packet error rate is high */ 636 if (++dev->pkt_cnt > 30) { 637 dev->pkt_cnt = 0; 638 dev->pkt_err = 0; 639 } else { 640 if (state == rx_cleanup) 641 dev->pkt_err++; 642 if (dev->pkt_err > 20) 643 set_bit(EVENT_RX_KILL, &dev->flags); 644 } 645 646 state = defer_bh(dev, skb, &dev->rxq, state); 647 648 if (urb) { 649 if (netif_running (dev->net) && 650 !test_bit (EVENT_RX_HALT, &dev->flags) && 651 state != unlink_start) { 652 rx_submit (dev, urb, GFP_ATOMIC); 653 usb_mark_last_busy(dev->udev); 654 return; 655 } 656 usb_free_urb (urb); 657 } 658 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n"); 659 } 660 661 /*-------------------------------------------------------------------------*/ 662 void usbnet_pause_rx(struct usbnet *dev) 663 { 664 set_bit(EVENT_RX_PAUSED, &dev->flags); 665 666 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n"); 667 } 668 EXPORT_SYMBOL_GPL(usbnet_pause_rx); 669 670 void usbnet_resume_rx(struct usbnet *dev) 671 { 672 struct sk_buff *skb; 673 int num = 0; 674 675 clear_bit(EVENT_RX_PAUSED, &dev->flags); 676 677 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) { 678 usbnet_skb_return(dev, skb); 679 num++; 680 } 681 682 tasklet_schedule(&dev->bh); 683 684 netif_dbg(dev, rx_status, dev->net, 685 "paused rx queue disabled, %d skbs requeued\n", num); 686 } 687 EXPORT_SYMBOL_GPL(usbnet_resume_rx); 688 689 void usbnet_purge_paused_rxq(struct usbnet *dev) 690 { 691 skb_queue_purge(&dev->rxq_pause); 692 } 693 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq); 694 695 /*-------------------------------------------------------------------------*/ 696 697 // unlink pending rx/tx; completion handlers do all other cleanup 698 699 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) 700 { 701 unsigned long flags; 702 struct sk_buff *skb; 703 int count = 0; 704 705 spin_lock_irqsave (&q->lock, flags); 706 while (!skb_queue_empty(q)) { 707 struct skb_data *entry; 708 struct urb *urb; 709 int retval; 710 711 skb_queue_walk(q, skb) { 712 entry = (struct skb_data *) skb->cb; 713 if (entry->state != unlink_start) 714 goto found; 715 } 716 break; 717 found: 718 entry->state = unlink_start; 719 urb = entry->urb; 720 721 /* 722 * Get reference count of the URB to avoid it to be 723 * freed during usb_unlink_urb, which may trigger 724 * use-after-free problem inside usb_unlink_urb since 725 * usb_unlink_urb is always racing with .complete 726 * handler(include defer_bh). 727 */ 728 usb_get_urb(urb); 729 spin_unlock_irqrestore(&q->lock, flags); 730 // during some PM-driven resume scenarios, 731 // these (async) unlinks complete immediately 732 retval = usb_unlink_urb (urb); 733 if (retval != -EINPROGRESS && retval != 0) 734 netdev_dbg(dev->net, "unlink urb err, %d\n", retval); 735 else 736 count++; 737 usb_put_urb(urb); 738 spin_lock_irqsave(&q->lock, flags); 739 } 740 spin_unlock_irqrestore (&q->lock, flags); 741 return count; 742 } 743 744 // Flush all pending rx urbs 745 // minidrivers may need to do this when the MTU changes 746 747 void usbnet_unlink_rx_urbs(struct usbnet *dev) 748 { 749 if (netif_running(dev->net)) { 750 (void) unlink_urbs (dev, &dev->rxq); 751 tasklet_schedule(&dev->bh); 752 } 753 } 754 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); 755 756 /*-------------------------------------------------------------------------*/ 757 758 // precondition: never called in_interrupt 759 static void usbnet_terminate_urbs(struct usbnet *dev) 760 { 761 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup); 762 DECLARE_WAITQUEUE(wait, current); 763 int temp; 764 765 /* ensure there are no more active urbs */ 766 add_wait_queue(&unlink_wakeup, &wait); 767 set_current_state(TASK_UNINTERRUPTIBLE); 768 dev->wait = &unlink_wakeup; 769 temp = unlink_urbs(dev, &dev->txq) + 770 unlink_urbs(dev, &dev->rxq); 771 772 /* maybe wait for deletions to finish. */ 773 while (!skb_queue_empty(&dev->rxq) 774 && !skb_queue_empty(&dev->txq) 775 && !skb_queue_empty(&dev->done)) { 776 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS)); 777 set_current_state(TASK_UNINTERRUPTIBLE); 778 netif_dbg(dev, ifdown, dev->net, 779 "waited for %d urb completions\n", temp); 780 } 781 set_current_state(TASK_RUNNING); 782 dev->wait = NULL; 783 remove_wait_queue(&unlink_wakeup, &wait); 784 } 785 786 int usbnet_stop (struct net_device *net) 787 { 788 struct usbnet *dev = netdev_priv(net); 789 struct driver_info *info = dev->driver_info; 790 int retval; 791 792 clear_bit(EVENT_DEV_OPEN, &dev->flags); 793 netif_stop_queue (net); 794 795 netif_info(dev, ifdown, dev->net, 796 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n", 797 net->stats.rx_packets, net->stats.tx_packets, 798 net->stats.rx_errors, net->stats.tx_errors); 799 800 /* allow minidriver to stop correctly (wireless devices to turn off 801 * radio etc) */ 802 if (info->stop) { 803 retval = info->stop(dev); 804 if (retval < 0) 805 netif_info(dev, ifdown, dev->net, 806 "stop fail (%d) usbnet usb-%s-%s, %s\n", 807 retval, 808 dev->udev->bus->bus_name, dev->udev->devpath, 809 info->description); 810 } 811 812 if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) 813 usbnet_terminate_urbs(dev); 814 815 usbnet_status_stop(dev); 816 817 usbnet_purge_paused_rxq(dev); 818 819 /* deferred work (task, timer, softirq) must also stop. 820 * can't flush_scheduled_work() until we drop rtnl (later), 821 * else workers could deadlock; so make workers a NOP. 822 */ 823 dev->flags = 0; 824 del_timer_sync (&dev->delay); 825 tasklet_kill (&dev->bh); 826 if (info->manage_power && 827 !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags)) 828 info->manage_power(dev, 0); 829 else 830 usb_autopm_put_interface(dev->intf); 831 832 return 0; 833 } 834 EXPORT_SYMBOL_GPL(usbnet_stop); 835 836 /*-------------------------------------------------------------------------*/ 837 838 // posts reads, and enables write queuing 839 840 // precondition: never called in_interrupt 841 842 int usbnet_open (struct net_device *net) 843 { 844 struct usbnet *dev = netdev_priv(net); 845 int retval; 846 struct driver_info *info = dev->driver_info; 847 848 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { 849 netif_info(dev, ifup, dev->net, 850 "resumption fail (%d) usbnet usb-%s-%s, %s\n", 851 retval, 852 dev->udev->bus->bus_name, 853 dev->udev->devpath, 854 info->description); 855 goto done_nopm; 856 } 857 858 // put into "known safe" state 859 if (info->reset && (retval = info->reset (dev)) < 0) { 860 netif_info(dev, ifup, dev->net, 861 "open reset fail (%d) usbnet usb-%s-%s, %s\n", 862 retval, 863 dev->udev->bus->bus_name, 864 dev->udev->devpath, 865 info->description); 866 goto done; 867 } 868 869 /* hard_mtu or rx_urb_size may change in reset() */ 870 usbnet_update_max_qlen(dev); 871 872 // insist peer be connected 873 if (info->check_connect && (retval = info->check_connect (dev)) < 0) { 874 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval); 875 goto done; 876 } 877 878 /* start any status interrupt transfer */ 879 if (dev->interrupt) { 880 retval = usbnet_status_start(dev, GFP_KERNEL); 881 if (retval < 0) { 882 netif_err(dev, ifup, dev->net, 883 "intr submit %d\n", retval); 884 goto done; 885 } 886 } 887 888 set_bit(EVENT_DEV_OPEN, &dev->flags); 889 netif_start_queue (net); 890 netif_info(dev, ifup, dev->net, 891 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n", 892 (int)RX_QLEN(dev), (int)TX_QLEN(dev), 893 dev->net->mtu, 894 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" : 895 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" : 896 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" : 897 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" : 898 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" : 899 "simple"); 900 901 /* reset rx error state */ 902 dev->pkt_cnt = 0; 903 dev->pkt_err = 0; 904 clear_bit(EVENT_RX_KILL, &dev->flags); 905 906 // delay posting reads until we're fully open 907 tasklet_schedule (&dev->bh); 908 if (info->manage_power) { 909 retval = info->manage_power(dev, 1); 910 if (retval < 0) { 911 retval = 0; 912 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags); 913 } else { 914 usb_autopm_put_interface(dev->intf); 915 } 916 } 917 return retval; 918 done: 919 usb_autopm_put_interface(dev->intf); 920 done_nopm: 921 return retval; 922 } 923 EXPORT_SYMBOL_GPL(usbnet_open); 924 925 /*-------------------------------------------------------------------------*/ 926 927 /* ethtool methods; minidrivers may need to add some more, but 928 * they'll probably want to use this base set. 929 */ 930 931 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd) 932 { 933 struct usbnet *dev = netdev_priv(net); 934 935 if (!dev->mii.mdio_read) 936 return -EOPNOTSUPP; 937 938 return mii_ethtool_gset(&dev->mii, cmd); 939 } 940 EXPORT_SYMBOL_GPL(usbnet_get_settings); 941 942 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd) 943 { 944 struct usbnet *dev = netdev_priv(net); 945 int retval; 946 947 if (!dev->mii.mdio_write) 948 return -EOPNOTSUPP; 949 950 retval = mii_ethtool_sset(&dev->mii, cmd); 951 952 /* link speed/duplex might have changed */ 953 if (dev->driver_info->link_reset) 954 dev->driver_info->link_reset(dev); 955 956 /* hard_mtu or rx_urb_size may change in link_reset() */ 957 usbnet_update_max_qlen(dev); 958 959 return retval; 960 961 } 962 EXPORT_SYMBOL_GPL(usbnet_set_settings); 963 964 u32 usbnet_get_link (struct net_device *net) 965 { 966 struct usbnet *dev = netdev_priv(net); 967 968 /* If a check_connect is defined, return its result */ 969 if (dev->driver_info->check_connect) 970 return dev->driver_info->check_connect (dev) == 0; 971 972 /* if the device has mii operations, use those */ 973 if (dev->mii.mdio_read) 974 return mii_link_ok(&dev->mii); 975 976 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ 977 return ethtool_op_get_link(net); 978 } 979 EXPORT_SYMBOL_GPL(usbnet_get_link); 980 981 int usbnet_nway_reset(struct net_device *net) 982 { 983 struct usbnet *dev = netdev_priv(net); 984 985 if (!dev->mii.mdio_write) 986 return -EOPNOTSUPP; 987 988 return mii_nway_restart(&dev->mii); 989 } 990 EXPORT_SYMBOL_GPL(usbnet_nway_reset); 991 992 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) 993 { 994 struct usbnet *dev = netdev_priv(net); 995 996 strlcpy (info->driver, dev->driver_name, sizeof info->driver); 997 strlcpy (info->version, DRIVER_VERSION, sizeof info->version); 998 strlcpy (info->fw_version, dev->driver_info->description, 999 sizeof info->fw_version); 1000 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); 1001 } 1002 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); 1003 1004 u32 usbnet_get_msglevel (struct net_device *net) 1005 { 1006 struct usbnet *dev = netdev_priv(net); 1007 1008 return dev->msg_enable; 1009 } 1010 EXPORT_SYMBOL_GPL(usbnet_get_msglevel); 1011 1012 void usbnet_set_msglevel (struct net_device *net, u32 level) 1013 { 1014 struct usbnet *dev = netdev_priv(net); 1015 1016 dev->msg_enable = level; 1017 } 1018 EXPORT_SYMBOL_GPL(usbnet_set_msglevel); 1019 1020 /* drivers may override default ethtool_ops in their bind() routine */ 1021 static const struct ethtool_ops usbnet_ethtool_ops = { 1022 .get_settings = usbnet_get_settings, 1023 .set_settings = usbnet_set_settings, 1024 .get_link = usbnet_get_link, 1025 .nway_reset = usbnet_nway_reset, 1026 .get_drvinfo = usbnet_get_drvinfo, 1027 .get_msglevel = usbnet_get_msglevel, 1028 .set_msglevel = usbnet_set_msglevel, 1029 .get_ts_info = ethtool_op_get_ts_info, 1030 }; 1031 1032 /*-------------------------------------------------------------------------*/ 1033 1034 static void __handle_link_change(struct usbnet *dev) 1035 { 1036 if (!test_bit(EVENT_DEV_OPEN, &dev->flags)) 1037 return; 1038 1039 if (!netif_carrier_ok(dev->net)) { 1040 /* kill URBs for reading packets to save bus bandwidth */ 1041 unlink_urbs(dev, &dev->rxq); 1042 1043 /* 1044 * tx_timeout will unlink URBs for sending packets and 1045 * tx queue is stopped by netcore after link becomes off 1046 */ 1047 } else { 1048 /* submitting URBs for reading packets */ 1049 tasklet_schedule(&dev->bh); 1050 } 1051 1052 /* hard_mtu or rx_urb_size may change during link change */ 1053 usbnet_update_max_qlen(dev); 1054 1055 clear_bit(EVENT_LINK_CHANGE, &dev->flags); 1056 } 1057 1058 /* work that cannot be done in interrupt context uses keventd. 1059 * 1060 * NOTE: with 2.5 we could do more of this using completion callbacks, 1061 * especially now that control transfers can be queued. 1062 */ 1063 static void 1064 kevent (struct work_struct *work) 1065 { 1066 struct usbnet *dev = 1067 container_of(work, struct usbnet, kevent); 1068 int status; 1069 1070 /* usb_clear_halt() needs a thread context */ 1071 if (test_bit (EVENT_TX_HALT, &dev->flags)) { 1072 unlink_urbs (dev, &dev->txq); 1073 status = usb_autopm_get_interface(dev->intf); 1074 if (status < 0) 1075 goto fail_pipe; 1076 status = usb_clear_halt (dev->udev, dev->out); 1077 usb_autopm_put_interface(dev->intf); 1078 if (status < 0 && 1079 status != -EPIPE && 1080 status != -ESHUTDOWN) { 1081 if (netif_msg_tx_err (dev)) 1082 fail_pipe: 1083 netdev_err(dev->net, "can't clear tx halt, status %d\n", 1084 status); 1085 } else { 1086 clear_bit (EVENT_TX_HALT, &dev->flags); 1087 if (status != -ESHUTDOWN) 1088 netif_wake_queue (dev->net); 1089 } 1090 } 1091 if (test_bit (EVENT_RX_HALT, &dev->flags)) { 1092 unlink_urbs (dev, &dev->rxq); 1093 status = usb_autopm_get_interface(dev->intf); 1094 if (status < 0) 1095 goto fail_halt; 1096 status = usb_clear_halt (dev->udev, dev->in); 1097 usb_autopm_put_interface(dev->intf); 1098 if (status < 0 && 1099 status != -EPIPE && 1100 status != -ESHUTDOWN) { 1101 if (netif_msg_rx_err (dev)) 1102 fail_halt: 1103 netdev_err(dev->net, "can't clear rx halt, status %d\n", 1104 status); 1105 } else { 1106 clear_bit (EVENT_RX_HALT, &dev->flags); 1107 tasklet_schedule (&dev->bh); 1108 } 1109 } 1110 1111 /* tasklet could resubmit itself forever if memory is tight */ 1112 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { 1113 struct urb *urb = NULL; 1114 int resched = 1; 1115 1116 if (netif_running (dev->net)) 1117 urb = usb_alloc_urb (0, GFP_KERNEL); 1118 else 1119 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1120 if (urb != NULL) { 1121 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1122 status = usb_autopm_get_interface(dev->intf); 1123 if (status < 0) { 1124 usb_free_urb(urb); 1125 goto fail_lowmem; 1126 } 1127 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) 1128 resched = 0; 1129 usb_autopm_put_interface(dev->intf); 1130 fail_lowmem: 1131 if (resched) 1132 tasklet_schedule (&dev->bh); 1133 } 1134 } 1135 1136 if (test_bit (EVENT_LINK_RESET, &dev->flags)) { 1137 struct driver_info *info = dev->driver_info; 1138 int retval = 0; 1139 1140 clear_bit (EVENT_LINK_RESET, &dev->flags); 1141 status = usb_autopm_get_interface(dev->intf); 1142 if (status < 0) 1143 goto skip_reset; 1144 if(info->link_reset && (retval = info->link_reset(dev)) < 0) { 1145 usb_autopm_put_interface(dev->intf); 1146 skip_reset: 1147 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", 1148 retval, 1149 dev->udev->bus->bus_name, 1150 dev->udev->devpath, 1151 info->description); 1152 } else { 1153 usb_autopm_put_interface(dev->intf); 1154 } 1155 1156 /* handle link change from link resetting */ 1157 __handle_link_change(dev); 1158 } 1159 1160 if (test_bit (EVENT_LINK_CHANGE, &dev->flags)) 1161 __handle_link_change(dev); 1162 1163 if (dev->flags) 1164 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); 1165 } 1166 1167 /*-------------------------------------------------------------------------*/ 1168 1169 static void tx_complete (struct urb *urb) 1170 { 1171 struct sk_buff *skb = (struct sk_buff *) urb->context; 1172 struct skb_data *entry = (struct skb_data *) skb->cb; 1173 struct usbnet *dev = entry->dev; 1174 1175 if (urb->status == 0) { 1176 if (!(dev->driver_info->flags & FLAG_MULTI_PACKET)) 1177 dev->net->stats.tx_packets++; 1178 dev->net->stats.tx_bytes += entry->length; 1179 } else { 1180 dev->net->stats.tx_errors++; 1181 1182 switch (urb->status) { 1183 case -EPIPE: 1184 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1185 break; 1186 1187 /* software-driven interface shutdown */ 1188 case -ECONNRESET: // async unlink 1189 case -ESHUTDOWN: // hardware gone 1190 break; 1191 1192 // like rx, tx gets controller i/o faults during khubd delays 1193 // and so it uses the same throttling mechanism. 1194 case -EPROTO: 1195 case -ETIME: 1196 case -EILSEQ: 1197 usb_mark_last_busy(dev->udev); 1198 if (!timer_pending (&dev->delay)) { 1199 mod_timer (&dev->delay, 1200 jiffies + THROTTLE_JIFFIES); 1201 netif_dbg(dev, link, dev->net, 1202 "tx throttle %d\n", urb->status); 1203 } 1204 netif_stop_queue (dev->net); 1205 break; 1206 default: 1207 netif_dbg(dev, tx_err, dev->net, 1208 "tx err %d\n", entry->urb->status); 1209 break; 1210 } 1211 } 1212 1213 usb_autopm_put_interface_async(dev->intf); 1214 (void) defer_bh(dev, skb, &dev->txq, tx_done); 1215 } 1216 1217 /*-------------------------------------------------------------------------*/ 1218 1219 void usbnet_tx_timeout (struct net_device *net) 1220 { 1221 struct usbnet *dev = netdev_priv(net); 1222 1223 unlink_urbs (dev, &dev->txq); 1224 tasklet_schedule (&dev->bh); 1225 1226 // FIXME: device recovery -- reset? 1227 } 1228 EXPORT_SYMBOL_GPL(usbnet_tx_timeout); 1229 1230 /*-------------------------------------------------------------------------*/ 1231 1232 static int build_dma_sg(const struct sk_buff *skb, struct urb *urb) 1233 { 1234 unsigned num_sgs, total_len = 0; 1235 int i, s = 0; 1236 1237 num_sgs = skb_shinfo(skb)->nr_frags + 1; 1238 if (num_sgs == 1) 1239 return 0; 1240 1241 /* reserve one for zero packet */ 1242 urb->sg = kmalloc((num_sgs + 1) * sizeof(struct scatterlist), 1243 GFP_ATOMIC); 1244 if (!urb->sg) 1245 return -ENOMEM; 1246 1247 urb->num_sgs = num_sgs; 1248 sg_init_table(urb->sg, urb->num_sgs); 1249 1250 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb)); 1251 total_len += skb_headlen(skb); 1252 1253 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1254 struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i]; 1255 1256 total_len += skb_frag_size(f); 1257 sg_set_page(&urb->sg[i + s], f->page.p, f->size, 1258 f->page_offset); 1259 } 1260 urb->transfer_buffer_length = total_len; 1261 1262 return 1; 1263 } 1264 1265 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, 1266 struct net_device *net) 1267 { 1268 struct usbnet *dev = netdev_priv(net); 1269 int length; 1270 struct urb *urb = NULL; 1271 struct skb_data *entry; 1272 struct driver_info *info = dev->driver_info; 1273 unsigned long flags; 1274 int retval; 1275 1276 if (skb) 1277 skb_tx_timestamp(skb); 1278 1279 // some devices want funky USB-level framing, for 1280 // win32 driver (usually) and/or hardware quirks 1281 if (info->tx_fixup) { 1282 skb = info->tx_fixup (dev, skb, GFP_ATOMIC); 1283 if (!skb) { 1284 /* packet collected; minidriver waiting for more */ 1285 if (info->flags & FLAG_MULTI_PACKET) 1286 goto not_drop; 1287 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); 1288 goto drop; 1289 } 1290 } 1291 1292 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { 1293 netif_dbg(dev, tx_err, dev->net, "no urb\n"); 1294 goto drop; 1295 } 1296 1297 entry = (struct skb_data *) skb->cb; 1298 entry->urb = urb; 1299 entry->dev = dev; 1300 1301 usb_fill_bulk_urb (urb, dev->udev, dev->out, 1302 skb->data, skb->len, tx_complete, skb); 1303 if (dev->can_dma_sg) { 1304 if (build_dma_sg(skb, urb) < 0) 1305 goto drop; 1306 } 1307 length = urb->transfer_buffer_length; 1308 1309 /* don't assume the hardware handles USB_ZERO_PACKET 1310 * NOTE: strictly conforming cdc-ether devices should expect 1311 * the ZLP here, but ignore the one-byte packet. 1312 * NOTE2: CDC NCM specification is different from CDC ECM when 1313 * handling ZLP/short packets, so cdc_ncm driver will make short 1314 * packet itself if needed. 1315 */ 1316 if (length % dev->maxpacket == 0) { 1317 if (!(info->flags & FLAG_SEND_ZLP)) { 1318 if (!(info->flags & FLAG_MULTI_PACKET)) { 1319 length++; 1320 if (skb_tailroom(skb) && !urb->num_sgs) { 1321 skb->data[skb->len] = 0; 1322 __skb_put(skb, 1); 1323 } else if (urb->num_sgs) 1324 sg_set_buf(&urb->sg[urb->num_sgs++], 1325 dev->padding_pkt, 1); 1326 } 1327 } else 1328 urb->transfer_flags |= URB_ZERO_PACKET; 1329 } 1330 entry->length = urb->transfer_buffer_length = length; 1331 1332 spin_lock_irqsave(&dev->txq.lock, flags); 1333 retval = usb_autopm_get_interface_async(dev->intf); 1334 if (retval < 0) { 1335 spin_unlock_irqrestore(&dev->txq.lock, flags); 1336 goto drop; 1337 } 1338 1339 #ifdef CONFIG_PM 1340 /* if this triggers the device is still a sleep */ 1341 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { 1342 /* transmission will be done in resume */ 1343 usb_anchor_urb(urb, &dev->deferred); 1344 /* no use to process more packets */ 1345 netif_stop_queue(net); 1346 usb_put_urb(urb); 1347 spin_unlock_irqrestore(&dev->txq.lock, flags); 1348 netdev_dbg(dev->net, "Delaying transmission for resumption\n"); 1349 goto deferred; 1350 } 1351 #endif 1352 1353 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { 1354 case -EPIPE: 1355 netif_stop_queue (net); 1356 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1357 usb_autopm_put_interface_async(dev->intf); 1358 break; 1359 default: 1360 usb_autopm_put_interface_async(dev->intf); 1361 netif_dbg(dev, tx_err, dev->net, 1362 "tx: submit urb err %d\n", retval); 1363 break; 1364 case 0: 1365 net->trans_start = jiffies; 1366 __usbnet_queue_skb(&dev->txq, skb, tx_start); 1367 if (dev->txq.qlen >= TX_QLEN (dev)) 1368 netif_stop_queue (net); 1369 } 1370 spin_unlock_irqrestore (&dev->txq.lock, flags); 1371 1372 if (retval) { 1373 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); 1374 drop: 1375 dev->net->stats.tx_dropped++; 1376 not_drop: 1377 if (skb) 1378 dev_kfree_skb_any (skb); 1379 if (urb) { 1380 kfree(urb->sg); 1381 usb_free_urb(urb); 1382 } 1383 } else 1384 netif_dbg(dev, tx_queued, dev->net, 1385 "> tx, len %d, type 0x%x\n", length, skb->protocol); 1386 #ifdef CONFIG_PM 1387 deferred: 1388 #endif 1389 return NETDEV_TX_OK; 1390 } 1391 EXPORT_SYMBOL_GPL(usbnet_start_xmit); 1392 1393 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags) 1394 { 1395 struct urb *urb; 1396 int i; 1397 int ret = 0; 1398 1399 /* don't refill the queue all at once */ 1400 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) { 1401 urb = usb_alloc_urb(0, flags); 1402 if (urb != NULL) { 1403 ret = rx_submit(dev, urb, flags); 1404 if (ret) 1405 goto err; 1406 } else { 1407 ret = -ENOMEM; 1408 goto err; 1409 } 1410 } 1411 err: 1412 return ret; 1413 } 1414 1415 /*-------------------------------------------------------------------------*/ 1416 1417 // tasklet (work deferred from completions, in_irq) or timer 1418 1419 static void usbnet_bh (unsigned long param) 1420 { 1421 struct usbnet *dev = (struct usbnet *) param; 1422 struct sk_buff *skb; 1423 struct skb_data *entry; 1424 1425 while ((skb = skb_dequeue (&dev->done))) { 1426 entry = (struct skb_data *) skb->cb; 1427 switch (entry->state) { 1428 case rx_done: 1429 entry->state = rx_cleanup; 1430 rx_process (dev, skb); 1431 continue; 1432 case tx_done: 1433 kfree(entry->urb->sg); 1434 case rx_cleanup: 1435 usb_free_urb (entry->urb); 1436 dev_kfree_skb (skb); 1437 continue; 1438 default: 1439 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); 1440 } 1441 } 1442 1443 /* restart RX again after disabling due to high error rate */ 1444 clear_bit(EVENT_RX_KILL, &dev->flags); 1445 1446 // waiting for all pending urbs to complete? 1447 if (dev->wait) { 1448 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) { 1449 wake_up (dev->wait); 1450 } 1451 1452 // or are we maybe short a few urbs? 1453 } else if (netif_running (dev->net) && 1454 netif_device_present (dev->net) && 1455 netif_carrier_ok(dev->net) && 1456 !timer_pending (&dev->delay) && 1457 !test_bit (EVENT_RX_HALT, &dev->flags)) { 1458 int temp = dev->rxq.qlen; 1459 1460 if (temp < RX_QLEN(dev)) { 1461 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK) 1462 return; 1463 if (temp != dev->rxq.qlen) 1464 netif_dbg(dev, link, dev->net, 1465 "rxqlen %d --> %d\n", 1466 temp, dev->rxq.qlen); 1467 if (dev->rxq.qlen < RX_QLEN(dev)) 1468 tasklet_schedule (&dev->bh); 1469 } 1470 if (dev->txq.qlen < TX_QLEN (dev)) 1471 netif_wake_queue (dev->net); 1472 } 1473 } 1474 1475 1476 /*------------------------------------------------------------------------- 1477 * 1478 * USB Device Driver support 1479 * 1480 *-------------------------------------------------------------------------*/ 1481 1482 // precondition: never called in_interrupt 1483 1484 void usbnet_disconnect (struct usb_interface *intf) 1485 { 1486 struct usbnet *dev; 1487 struct usb_device *xdev; 1488 struct net_device *net; 1489 1490 dev = usb_get_intfdata(intf); 1491 usb_set_intfdata(intf, NULL); 1492 if (!dev) 1493 return; 1494 1495 xdev = interface_to_usbdev (intf); 1496 1497 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", 1498 intf->dev.driver->name, 1499 xdev->bus->bus_name, xdev->devpath, 1500 dev->driver_info->description); 1501 1502 net = dev->net; 1503 unregister_netdev (net); 1504 1505 cancel_work_sync(&dev->kevent); 1506 1507 usb_scuttle_anchored_urbs(&dev->deferred); 1508 1509 if (dev->driver_info->unbind) 1510 dev->driver_info->unbind (dev, intf); 1511 1512 usb_kill_urb(dev->interrupt); 1513 usb_free_urb(dev->interrupt); 1514 kfree(dev->padding_pkt); 1515 1516 free_netdev(net); 1517 } 1518 EXPORT_SYMBOL_GPL(usbnet_disconnect); 1519 1520 static const struct net_device_ops usbnet_netdev_ops = { 1521 .ndo_open = usbnet_open, 1522 .ndo_stop = usbnet_stop, 1523 .ndo_start_xmit = usbnet_start_xmit, 1524 .ndo_tx_timeout = usbnet_tx_timeout, 1525 .ndo_change_mtu = usbnet_change_mtu, 1526 .ndo_set_mac_address = eth_mac_addr, 1527 .ndo_validate_addr = eth_validate_addr, 1528 }; 1529 1530 /*-------------------------------------------------------------------------*/ 1531 1532 // precondition: never called in_interrupt 1533 1534 static struct device_type wlan_type = { 1535 .name = "wlan", 1536 }; 1537 1538 static struct device_type wwan_type = { 1539 .name = "wwan", 1540 }; 1541 1542 int 1543 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) 1544 { 1545 struct usbnet *dev; 1546 struct net_device *net; 1547 struct usb_host_interface *interface; 1548 struct driver_info *info; 1549 struct usb_device *xdev; 1550 int status; 1551 const char *name; 1552 struct usb_driver *driver = to_usb_driver(udev->dev.driver); 1553 1554 /* usbnet already took usb runtime pm, so have to enable the feature 1555 * for usb interface, otherwise usb_autopm_get_interface may return 1556 * failure if RUNTIME_PM is enabled. 1557 */ 1558 if (!driver->supports_autosuspend) { 1559 driver->supports_autosuspend = 1; 1560 pm_runtime_enable(&udev->dev); 1561 } 1562 1563 name = udev->dev.driver->name; 1564 info = (struct driver_info *) prod->driver_info; 1565 if (!info) { 1566 dev_dbg (&udev->dev, "blacklisted by %s\n", name); 1567 return -ENODEV; 1568 } 1569 xdev = interface_to_usbdev (udev); 1570 interface = udev->cur_altsetting; 1571 1572 status = -ENOMEM; 1573 1574 // set up our own records 1575 net = alloc_etherdev(sizeof(*dev)); 1576 if (!net) 1577 goto out; 1578 1579 /* netdev_printk() needs this so do it as early as possible */ 1580 SET_NETDEV_DEV(net, &udev->dev); 1581 1582 dev = netdev_priv(net); 1583 dev->udev = xdev; 1584 dev->intf = udev; 1585 dev->driver_info = info; 1586 dev->driver_name = name; 1587 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV 1588 | NETIF_MSG_PROBE | NETIF_MSG_LINK); 1589 skb_queue_head_init (&dev->rxq); 1590 skb_queue_head_init (&dev->txq); 1591 skb_queue_head_init (&dev->done); 1592 skb_queue_head_init(&dev->rxq_pause); 1593 dev->bh.func = usbnet_bh; 1594 dev->bh.data = (unsigned long) dev; 1595 INIT_WORK (&dev->kevent, kevent); 1596 init_usb_anchor(&dev->deferred); 1597 dev->delay.function = usbnet_bh; 1598 dev->delay.data = (unsigned long) dev; 1599 init_timer (&dev->delay); 1600 mutex_init (&dev->phy_mutex); 1601 mutex_init(&dev->interrupt_mutex); 1602 dev->interrupt_count = 0; 1603 1604 dev->net = net; 1605 strcpy (net->name, "usb%d"); 1606 memcpy (net->dev_addr, node_id, sizeof node_id); 1607 1608 /* rx and tx sides can use different message sizes; 1609 * bind() should set rx_urb_size in that case. 1610 */ 1611 dev->hard_mtu = net->mtu + net->hard_header_len; 1612 #if 0 1613 // dma_supported() is deeply broken on almost all architectures 1614 // possible with some EHCI controllers 1615 if (dma_supported (&udev->dev, DMA_BIT_MASK(64))) 1616 net->features |= NETIF_F_HIGHDMA; 1617 #endif 1618 1619 net->netdev_ops = &usbnet_netdev_ops; 1620 net->watchdog_timeo = TX_TIMEOUT_JIFFIES; 1621 net->ethtool_ops = &usbnet_ethtool_ops; 1622 1623 // allow device-specific bind/init procedures 1624 // NOTE net->name still not usable ... 1625 if (info->bind) { 1626 status = info->bind (dev, udev); 1627 if (status < 0) 1628 goto out1; 1629 1630 // heuristic: "usb%d" for links we know are two-host, 1631 // else "eth%d" when there's reasonable doubt. userspace 1632 // can rename the link if it knows better. 1633 if ((dev->driver_info->flags & FLAG_ETHER) != 0 && 1634 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 || 1635 (net->dev_addr [0] & 0x02) == 0)) 1636 strcpy (net->name, "eth%d"); 1637 /* WLAN devices should always be named "wlan%d" */ 1638 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1639 strcpy(net->name, "wlan%d"); 1640 /* WWAN devices should always be named "wwan%d" */ 1641 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1642 strcpy(net->name, "wwan%d"); 1643 1644 /* devices that cannot do ARP */ 1645 if ((dev->driver_info->flags & FLAG_NOARP) != 0) 1646 net->flags |= IFF_NOARP; 1647 1648 /* maybe the remote can't receive an Ethernet MTU */ 1649 if (net->mtu > (dev->hard_mtu - net->hard_header_len)) 1650 net->mtu = dev->hard_mtu - net->hard_header_len; 1651 } else if (!info->in || !info->out) 1652 status = usbnet_get_endpoints (dev, udev); 1653 else { 1654 dev->in = usb_rcvbulkpipe (xdev, info->in); 1655 dev->out = usb_sndbulkpipe (xdev, info->out); 1656 if (!(info->flags & FLAG_NO_SETINT)) 1657 status = usb_set_interface (xdev, 1658 interface->desc.bInterfaceNumber, 1659 interface->desc.bAlternateSetting); 1660 else 1661 status = 0; 1662 1663 } 1664 if (status >= 0 && dev->status) 1665 status = init_status (dev, udev); 1666 if (status < 0) 1667 goto out3; 1668 1669 if (!dev->rx_urb_size) 1670 dev->rx_urb_size = dev->hard_mtu; 1671 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); 1672 1673 /* let userspace know we have a random address */ 1674 if (ether_addr_equal(net->dev_addr, node_id)) 1675 net->addr_assign_type = NET_ADDR_RANDOM; 1676 1677 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1678 SET_NETDEV_DEVTYPE(net, &wlan_type); 1679 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1680 SET_NETDEV_DEVTYPE(net, &wwan_type); 1681 1682 /* initialize max rx_qlen and tx_qlen */ 1683 usbnet_update_max_qlen(dev); 1684 1685 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) && 1686 !(info->flags & FLAG_MULTI_PACKET)) { 1687 dev->padding_pkt = kzalloc(1, GFP_KERNEL); 1688 if (!dev->padding_pkt) { 1689 status = -ENOMEM; 1690 goto out4; 1691 } 1692 } 1693 1694 status = register_netdev (net); 1695 if (status) 1696 goto out5; 1697 netif_info(dev, probe, dev->net, 1698 "register '%s' at usb-%s-%s, %s, %pM\n", 1699 udev->dev.driver->name, 1700 xdev->bus->bus_name, xdev->devpath, 1701 dev->driver_info->description, 1702 net->dev_addr); 1703 1704 // ok, it's ready to go. 1705 usb_set_intfdata (udev, dev); 1706 1707 netif_device_attach (net); 1708 1709 if (dev->driver_info->flags & FLAG_LINK_INTR) 1710 usbnet_link_change(dev, 0, 0); 1711 1712 return 0; 1713 1714 out5: 1715 kfree(dev->padding_pkt); 1716 out4: 1717 usb_free_urb(dev->interrupt); 1718 out3: 1719 if (info->unbind) 1720 info->unbind (dev, udev); 1721 out1: 1722 free_netdev(net); 1723 out: 1724 return status; 1725 } 1726 EXPORT_SYMBOL_GPL(usbnet_probe); 1727 1728 /*-------------------------------------------------------------------------*/ 1729 1730 /* 1731 * suspend the whole driver as soon as the first interface is suspended 1732 * resume only when the last interface is resumed 1733 */ 1734 1735 int usbnet_suspend (struct usb_interface *intf, pm_message_t message) 1736 { 1737 struct usbnet *dev = usb_get_intfdata(intf); 1738 1739 if (!dev->suspend_count++) { 1740 spin_lock_irq(&dev->txq.lock); 1741 /* don't autosuspend while transmitting */ 1742 if (dev->txq.qlen && PMSG_IS_AUTO(message)) { 1743 dev->suspend_count--; 1744 spin_unlock_irq(&dev->txq.lock); 1745 return -EBUSY; 1746 } else { 1747 set_bit(EVENT_DEV_ASLEEP, &dev->flags); 1748 spin_unlock_irq(&dev->txq.lock); 1749 } 1750 /* 1751 * accelerate emptying of the rx and queues, to avoid 1752 * having everything error out. 1753 */ 1754 netif_device_detach (dev->net); 1755 usbnet_terminate_urbs(dev); 1756 __usbnet_status_stop_force(dev); 1757 1758 /* 1759 * reattach so runtime management can use and 1760 * wake the device 1761 */ 1762 netif_device_attach (dev->net); 1763 } 1764 return 0; 1765 } 1766 EXPORT_SYMBOL_GPL(usbnet_suspend); 1767 1768 int usbnet_resume (struct usb_interface *intf) 1769 { 1770 struct usbnet *dev = usb_get_intfdata(intf); 1771 struct sk_buff *skb; 1772 struct urb *res; 1773 int retval; 1774 1775 if (!--dev->suspend_count) { 1776 /* resume interrupt URB if it was previously submitted */ 1777 __usbnet_status_start_force(dev, GFP_NOIO); 1778 1779 spin_lock_irq(&dev->txq.lock); 1780 while ((res = usb_get_from_anchor(&dev->deferred))) { 1781 1782 skb = (struct sk_buff *)res->context; 1783 retval = usb_submit_urb(res, GFP_ATOMIC); 1784 if (retval < 0) { 1785 dev_kfree_skb_any(skb); 1786 kfree(res->sg); 1787 usb_free_urb(res); 1788 usb_autopm_put_interface_async(dev->intf); 1789 } else { 1790 dev->net->trans_start = jiffies; 1791 __skb_queue_tail(&dev->txq, skb); 1792 } 1793 } 1794 1795 smp_mb(); 1796 clear_bit(EVENT_DEV_ASLEEP, &dev->flags); 1797 spin_unlock_irq(&dev->txq.lock); 1798 1799 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) { 1800 /* handle remote wakeup ASAP */ 1801 if (!dev->wait && 1802 netif_device_present(dev->net) && 1803 !timer_pending(&dev->delay) && 1804 !test_bit(EVENT_RX_HALT, &dev->flags)) 1805 rx_alloc_submit(dev, GFP_NOIO); 1806 1807 if (!(dev->txq.qlen >= TX_QLEN(dev))) 1808 netif_tx_wake_all_queues(dev->net); 1809 tasklet_schedule (&dev->bh); 1810 } 1811 } 1812 1813 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) 1814 usb_autopm_get_interface_no_resume(intf); 1815 1816 return 0; 1817 } 1818 EXPORT_SYMBOL_GPL(usbnet_resume); 1819 1820 /* 1821 * Either a subdriver implements manage_power, then it is assumed to always 1822 * be ready to be suspended or it reports the readiness to be suspended 1823 * explicitly 1824 */ 1825 void usbnet_device_suggests_idle(struct usbnet *dev) 1826 { 1827 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) { 1828 dev->intf->needs_remote_wakeup = 1; 1829 usb_autopm_put_interface_async(dev->intf); 1830 } 1831 } 1832 EXPORT_SYMBOL(usbnet_device_suggests_idle); 1833 1834 /* 1835 * For devices that can do without special commands 1836 */ 1837 int usbnet_manage_power(struct usbnet *dev, int on) 1838 { 1839 dev->intf->needs_remote_wakeup = on; 1840 return 0; 1841 } 1842 EXPORT_SYMBOL(usbnet_manage_power); 1843 1844 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset) 1845 { 1846 /* update link after link is reseted */ 1847 if (link && !need_reset) 1848 netif_carrier_on(dev->net); 1849 else 1850 netif_carrier_off(dev->net); 1851 1852 if (need_reset && link) 1853 usbnet_defer_kevent(dev, EVENT_LINK_RESET); 1854 else 1855 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE); 1856 } 1857 EXPORT_SYMBOL(usbnet_link_change); 1858 1859 /*-------------------------------------------------------------------------*/ 1860 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1861 u16 value, u16 index, void *data, u16 size) 1862 { 1863 void *buf = NULL; 1864 int err = -ENOMEM; 1865 1866 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x" 1867 " value=0x%04x index=0x%04x size=%d\n", 1868 cmd, reqtype, value, index, size); 1869 1870 if (data) { 1871 buf = kmalloc(size, GFP_KERNEL); 1872 if (!buf) 1873 goto out; 1874 } 1875 1876 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), 1877 cmd, reqtype, value, index, buf, size, 1878 USB_CTRL_GET_TIMEOUT); 1879 if (err > 0 && err <= size) 1880 memcpy(data, buf, err); 1881 kfree(buf); 1882 out: 1883 return err; 1884 } 1885 1886 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1887 u16 value, u16 index, const void *data, 1888 u16 size) 1889 { 1890 void *buf = NULL; 1891 int err = -ENOMEM; 1892 1893 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 1894 " value=0x%04x index=0x%04x size=%d\n", 1895 cmd, reqtype, value, index, size); 1896 1897 if (data) { 1898 buf = kmemdup(data, size, GFP_KERNEL); 1899 if (!buf) 1900 goto out; 1901 } 1902 1903 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), 1904 cmd, reqtype, value, index, buf, size, 1905 USB_CTRL_SET_TIMEOUT); 1906 kfree(buf); 1907 1908 out: 1909 return err; 1910 } 1911 1912 /* 1913 * The function can't be called inside suspend/resume callback, 1914 * otherwise deadlock will be caused. 1915 */ 1916 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1917 u16 value, u16 index, void *data, u16 size) 1918 { 1919 int ret; 1920 1921 if (usb_autopm_get_interface(dev->intf) < 0) 1922 return -ENODEV; 1923 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index, 1924 data, size); 1925 usb_autopm_put_interface(dev->intf); 1926 return ret; 1927 } 1928 EXPORT_SYMBOL_GPL(usbnet_read_cmd); 1929 1930 /* 1931 * The function can't be called inside suspend/resume callback, 1932 * otherwise deadlock will be caused. 1933 */ 1934 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1935 u16 value, u16 index, const void *data, u16 size) 1936 { 1937 int ret; 1938 1939 if (usb_autopm_get_interface(dev->intf) < 0) 1940 return -ENODEV; 1941 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index, 1942 data, size); 1943 usb_autopm_put_interface(dev->intf); 1944 return ret; 1945 } 1946 EXPORT_SYMBOL_GPL(usbnet_write_cmd); 1947 1948 /* 1949 * The function can be called inside suspend/resume callback safely 1950 * and should only be called by suspend/resume callback generally. 1951 */ 1952 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 1953 u16 value, u16 index, void *data, u16 size) 1954 { 1955 return __usbnet_read_cmd(dev, cmd, reqtype, value, index, 1956 data, size); 1957 } 1958 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm); 1959 1960 /* 1961 * The function can be called inside suspend/resume callback safely 1962 * and should only be called by suspend/resume callback generally. 1963 */ 1964 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 1965 u16 value, u16 index, const void *data, 1966 u16 size) 1967 { 1968 return __usbnet_write_cmd(dev, cmd, reqtype, value, index, 1969 data, size); 1970 } 1971 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm); 1972 1973 static void usbnet_async_cmd_cb(struct urb *urb) 1974 { 1975 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context; 1976 int status = urb->status; 1977 1978 if (status < 0) 1979 dev_dbg(&urb->dev->dev, "%s failed with %d", 1980 __func__, status); 1981 1982 kfree(req); 1983 usb_free_urb(urb); 1984 } 1985 1986 /* 1987 * The caller must make sure that device can't be put into suspend 1988 * state until the control URB completes. 1989 */ 1990 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype, 1991 u16 value, u16 index, const void *data, u16 size) 1992 { 1993 struct usb_ctrlrequest *req = NULL; 1994 struct urb *urb; 1995 int err = -ENOMEM; 1996 void *buf = NULL; 1997 1998 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 1999 " value=0x%04x index=0x%04x size=%d\n", 2000 cmd, reqtype, value, index, size); 2001 2002 urb = usb_alloc_urb(0, GFP_ATOMIC); 2003 if (!urb) { 2004 netdev_err(dev->net, "Error allocating URB in" 2005 " %s!\n", __func__); 2006 goto fail; 2007 } 2008 2009 if (data) { 2010 buf = kmemdup(data, size, GFP_ATOMIC); 2011 if (!buf) { 2012 netdev_err(dev->net, "Error allocating buffer" 2013 " in %s!\n", __func__); 2014 goto fail_free; 2015 } 2016 } 2017 2018 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC); 2019 if (!req) 2020 goto fail_free_buf; 2021 2022 req->bRequestType = reqtype; 2023 req->bRequest = cmd; 2024 req->wValue = cpu_to_le16(value); 2025 req->wIndex = cpu_to_le16(index); 2026 req->wLength = cpu_to_le16(size); 2027 2028 usb_fill_control_urb(urb, dev->udev, 2029 usb_sndctrlpipe(dev->udev, 0), 2030 (void *)req, buf, size, 2031 usbnet_async_cmd_cb, req); 2032 urb->transfer_flags |= URB_FREE_BUFFER; 2033 2034 err = usb_submit_urb(urb, GFP_ATOMIC); 2035 if (err < 0) { 2036 netdev_err(dev->net, "Error submitting the control" 2037 " message: status=%d\n", err); 2038 goto fail_free; 2039 } 2040 return 0; 2041 2042 fail_free_buf: 2043 kfree(buf); 2044 fail_free: 2045 kfree(req); 2046 usb_free_urb(urb); 2047 fail: 2048 return err; 2049 2050 } 2051 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async); 2052 /*-------------------------------------------------------------------------*/ 2053 2054 static int __init usbnet_init(void) 2055 { 2056 /* Compiler should optimize this out. */ 2057 BUILD_BUG_ON( 2058 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data)); 2059 2060 eth_random_addr(node_id); 2061 return 0; 2062 } 2063 module_init(usbnet_init); 2064 2065 static void __exit usbnet_exit(void) 2066 { 2067 } 2068 module_exit(usbnet_exit); 2069 2070 MODULE_AUTHOR("David Brownell"); 2071 MODULE_DESCRIPTION("USB network driver framework"); 2072 MODULE_LICENSE("GPL"); 2073