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_WAITQUEUE(wait, current); 756 int temp; 757 758 /* ensure there are no more active urbs */ 759 add_wait_queue(&dev->wait, &wait); 760 set_current_state(TASK_UNINTERRUPTIBLE); 761 temp = unlink_urbs(dev, &dev->txq) + 762 unlink_urbs(dev, &dev->rxq); 763 764 /* maybe wait for deletions to finish. */ 765 while (!skb_queue_empty(&dev->rxq) 766 && !skb_queue_empty(&dev->txq) 767 && !skb_queue_empty(&dev->done)) { 768 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS)); 769 set_current_state(TASK_UNINTERRUPTIBLE); 770 netif_dbg(dev, ifdown, dev->net, 771 "waited for %d urb completions\n", temp); 772 } 773 set_current_state(TASK_RUNNING); 774 remove_wait_queue(&dev->wait, &wait); 775 } 776 777 int usbnet_stop (struct net_device *net) 778 { 779 struct usbnet *dev = netdev_priv(net); 780 struct driver_info *info = dev->driver_info; 781 int retval, pm; 782 783 clear_bit(EVENT_DEV_OPEN, &dev->flags); 784 netif_stop_queue (net); 785 786 netif_info(dev, ifdown, dev->net, 787 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n", 788 net->stats.rx_packets, net->stats.tx_packets, 789 net->stats.rx_errors, net->stats.tx_errors); 790 791 /* to not race resume */ 792 pm = usb_autopm_get_interface(dev->intf); 793 /* allow minidriver to stop correctly (wireless devices to turn off 794 * radio etc) */ 795 if (info->stop) { 796 retval = info->stop(dev); 797 if (retval < 0) 798 netif_info(dev, ifdown, dev->net, 799 "stop fail (%d) usbnet usb-%s-%s, %s\n", 800 retval, 801 dev->udev->bus->bus_name, dev->udev->devpath, 802 info->description); 803 } 804 805 if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) 806 usbnet_terminate_urbs(dev); 807 808 usbnet_status_stop(dev); 809 810 usbnet_purge_paused_rxq(dev); 811 812 /* deferred work (task, timer, softirq) must also stop. 813 * can't flush_scheduled_work() until we drop rtnl (later), 814 * else workers could deadlock; so make workers a NOP. 815 */ 816 dev->flags = 0; 817 del_timer_sync (&dev->delay); 818 tasklet_kill (&dev->bh); 819 if (!pm) 820 usb_autopm_put_interface(dev->intf); 821 822 if (info->manage_power && 823 !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags)) 824 info->manage_power(dev, 0); 825 else 826 usb_autopm_put_interface(dev->intf); 827 828 return 0; 829 } 830 EXPORT_SYMBOL_GPL(usbnet_stop); 831 832 /*-------------------------------------------------------------------------*/ 833 834 // posts reads, and enables write queuing 835 836 // precondition: never called in_interrupt 837 838 int usbnet_open (struct net_device *net) 839 { 840 struct usbnet *dev = netdev_priv(net); 841 int retval; 842 struct driver_info *info = dev->driver_info; 843 844 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { 845 netif_info(dev, ifup, dev->net, 846 "resumption fail (%d) usbnet usb-%s-%s, %s\n", 847 retval, 848 dev->udev->bus->bus_name, 849 dev->udev->devpath, 850 info->description); 851 goto done_nopm; 852 } 853 854 // put into "known safe" state 855 if (info->reset && (retval = info->reset (dev)) < 0) { 856 netif_info(dev, ifup, dev->net, 857 "open reset fail (%d) usbnet usb-%s-%s, %s\n", 858 retval, 859 dev->udev->bus->bus_name, 860 dev->udev->devpath, 861 info->description); 862 goto done; 863 } 864 865 /* hard_mtu or rx_urb_size may change in reset() */ 866 usbnet_update_max_qlen(dev); 867 868 // insist peer be connected 869 if (info->check_connect && (retval = info->check_connect (dev)) < 0) { 870 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval); 871 goto done; 872 } 873 874 /* start any status interrupt transfer */ 875 if (dev->interrupt) { 876 retval = usbnet_status_start(dev, GFP_KERNEL); 877 if (retval < 0) { 878 netif_err(dev, ifup, dev->net, 879 "intr submit %d\n", retval); 880 goto done; 881 } 882 } 883 884 set_bit(EVENT_DEV_OPEN, &dev->flags); 885 netif_start_queue (net); 886 netif_info(dev, ifup, dev->net, 887 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n", 888 (int)RX_QLEN(dev), (int)TX_QLEN(dev), 889 dev->net->mtu, 890 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" : 891 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" : 892 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" : 893 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" : 894 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" : 895 "simple"); 896 897 /* reset rx error state */ 898 dev->pkt_cnt = 0; 899 dev->pkt_err = 0; 900 clear_bit(EVENT_RX_KILL, &dev->flags); 901 902 // delay posting reads until we're fully open 903 tasklet_schedule (&dev->bh); 904 if (info->manage_power) { 905 retval = info->manage_power(dev, 1); 906 if (retval < 0) { 907 retval = 0; 908 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags); 909 } else { 910 usb_autopm_put_interface(dev->intf); 911 } 912 } 913 return retval; 914 done: 915 usb_autopm_put_interface(dev->intf); 916 done_nopm: 917 return retval; 918 } 919 EXPORT_SYMBOL_GPL(usbnet_open); 920 921 /*-------------------------------------------------------------------------*/ 922 923 /* ethtool methods; minidrivers may need to add some more, but 924 * they'll probably want to use this base set. 925 */ 926 927 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd) 928 { 929 struct usbnet *dev = netdev_priv(net); 930 931 if (!dev->mii.mdio_read) 932 return -EOPNOTSUPP; 933 934 return mii_ethtool_gset(&dev->mii, cmd); 935 } 936 EXPORT_SYMBOL_GPL(usbnet_get_settings); 937 938 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd) 939 { 940 struct usbnet *dev = netdev_priv(net); 941 int retval; 942 943 if (!dev->mii.mdio_write) 944 return -EOPNOTSUPP; 945 946 retval = mii_ethtool_sset(&dev->mii, cmd); 947 948 /* link speed/duplex might have changed */ 949 if (dev->driver_info->link_reset) 950 dev->driver_info->link_reset(dev); 951 952 /* hard_mtu or rx_urb_size may change in link_reset() */ 953 usbnet_update_max_qlen(dev); 954 955 return retval; 956 957 } 958 EXPORT_SYMBOL_GPL(usbnet_set_settings); 959 960 u32 usbnet_get_link (struct net_device *net) 961 { 962 struct usbnet *dev = netdev_priv(net); 963 964 /* If a check_connect is defined, return its result */ 965 if (dev->driver_info->check_connect) 966 return dev->driver_info->check_connect (dev) == 0; 967 968 /* if the device has mii operations, use those */ 969 if (dev->mii.mdio_read) 970 return mii_link_ok(&dev->mii); 971 972 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ 973 return ethtool_op_get_link(net); 974 } 975 EXPORT_SYMBOL_GPL(usbnet_get_link); 976 977 int usbnet_nway_reset(struct net_device *net) 978 { 979 struct usbnet *dev = netdev_priv(net); 980 981 if (!dev->mii.mdio_write) 982 return -EOPNOTSUPP; 983 984 return mii_nway_restart(&dev->mii); 985 } 986 EXPORT_SYMBOL_GPL(usbnet_nway_reset); 987 988 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) 989 { 990 struct usbnet *dev = netdev_priv(net); 991 992 strlcpy (info->driver, dev->driver_name, sizeof info->driver); 993 strlcpy (info->version, DRIVER_VERSION, sizeof info->version); 994 strlcpy (info->fw_version, dev->driver_info->description, 995 sizeof info->fw_version); 996 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); 997 } 998 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); 999 1000 u32 usbnet_get_msglevel (struct net_device *net) 1001 { 1002 struct usbnet *dev = netdev_priv(net); 1003 1004 return dev->msg_enable; 1005 } 1006 EXPORT_SYMBOL_GPL(usbnet_get_msglevel); 1007 1008 void usbnet_set_msglevel (struct net_device *net, u32 level) 1009 { 1010 struct usbnet *dev = netdev_priv(net); 1011 1012 dev->msg_enable = level; 1013 } 1014 EXPORT_SYMBOL_GPL(usbnet_set_msglevel); 1015 1016 /* drivers may override default ethtool_ops in their bind() routine */ 1017 static const struct ethtool_ops usbnet_ethtool_ops = { 1018 .get_settings = usbnet_get_settings, 1019 .set_settings = usbnet_set_settings, 1020 .get_link = usbnet_get_link, 1021 .nway_reset = usbnet_nway_reset, 1022 .get_drvinfo = usbnet_get_drvinfo, 1023 .get_msglevel = usbnet_get_msglevel, 1024 .set_msglevel = usbnet_set_msglevel, 1025 .get_ts_info = ethtool_op_get_ts_info, 1026 }; 1027 1028 /*-------------------------------------------------------------------------*/ 1029 1030 static void __handle_link_change(struct usbnet *dev) 1031 { 1032 if (!test_bit(EVENT_DEV_OPEN, &dev->flags)) 1033 return; 1034 1035 if (!netif_carrier_ok(dev->net)) { 1036 /* kill URBs for reading packets to save bus bandwidth */ 1037 unlink_urbs(dev, &dev->rxq); 1038 1039 /* 1040 * tx_timeout will unlink URBs for sending packets and 1041 * tx queue is stopped by netcore after link becomes off 1042 */ 1043 } else { 1044 /* submitting URBs for reading packets */ 1045 tasklet_schedule(&dev->bh); 1046 } 1047 1048 /* hard_mtu or rx_urb_size may change during link change */ 1049 usbnet_update_max_qlen(dev); 1050 1051 clear_bit(EVENT_LINK_CHANGE, &dev->flags); 1052 } 1053 1054 /* work that cannot be done in interrupt context uses keventd. 1055 * 1056 * NOTE: with 2.5 we could do more of this using completion callbacks, 1057 * especially now that control transfers can be queued. 1058 */ 1059 static void 1060 kevent (struct work_struct *work) 1061 { 1062 struct usbnet *dev = 1063 container_of(work, struct usbnet, kevent); 1064 int status; 1065 1066 /* usb_clear_halt() needs a thread context */ 1067 if (test_bit (EVENT_TX_HALT, &dev->flags)) { 1068 unlink_urbs (dev, &dev->txq); 1069 status = usb_autopm_get_interface(dev->intf); 1070 if (status < 0) 1071 goto fail_pipe; 1072 status = usb_clear_halt (dev->udev, dev->out); 1073 usb_autopm_put_interface(dev->intf); 1074 if (status < 0 && 1075 status != -EPIPE && 1076 status != -ESHUTDOWN) { 1077 if (netif_msg_tx_err (dev)) 1078 fail_pipe: 1079 netdev_err(dev->net, "can't clear tx halt, status %d\n", 1080 status); 1081 } else { 1082 clear_bit (EVENT_TX_HALT, &dev->flags); 1083 if (status != -ESHUTDOWN) 1084 netif_wake_queue (dev->net); 1085 } 1086 } 1087 if (test_bit (EVENT_RX_HALT, &dev->flags)) { 1088 unlink_urbs (dev, &dev->rxq); 1089 status = usb_autopm_get_interface(dev->intf); 1090 if (status < 0) 1091 goto fail_halt; 1092 status = usb_clear_halt (dev->udev, dev->in); 1093 usb_autopm_put_interface(dev->intf); 1094 if (status < 0 && 1095 status != -EPIPE && 1096 status != -ESHUTDOWN) { 1097 if (netif_msg_rx_err (dev)) 1098 fail_halt: 1099 netdev_err(dev->net, "can't clear rx halt, status %d\n", 1100 status); 1101 } else { 1102 clear_bit (EVENT_RX_HALT, &dev->flags); 1103 tasklet_schedule (&dev->bh); 1104 } 1105 } 1106 1107 /* tasklet could resubmit itself forever if memory is tight */ 1108 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { 1109 struct urb *urb = NULL; 1110 int resched = 1; 1111 1112 if (netif_running (dev->net)) 1113 urb = usb_alloc_urb (0, GFP_KERNEL); 1114 else 1115 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1116 if (urb != NULL) { 1117 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1118 status = usb_autopm_get_interface(dev->intf); 1119 if (status < 0) { 1120 usb_free_urb(urb); 1121 goto fail_lowmem; 1122 } 1123 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) 1124 resched = 0; 1125 usb_autopm_put_interface(dev->intf); 1126 fail_lowmem: 1127 if (resched) 1128 tasklet_schedule (&dev->bh); 1129 } 1130 } 1131 1132 if (test_bit (EVENT_LINK_RESET, &dev->flags)) { 1133 struct driver_info *info = dev->driver_info; 1134 int retval = 0; 1135 1136 clear_bit (EVENT_LINK_RESET, &dev->flags); 1137 status = usb_autopm_get_interface(dev->intf); 1138 if (status < 0) 1139 goto skip_reset; 1140 if(info->link_reset && (retval = info->link_reset(dev)) < 0) { 1141 usb_autopm_put_interface(dev->intf); 1142 skip_reset: 1143 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", 1144 retval, 1145 dev->udev->bus->bus_name, 1146 dev->udev->devpath, 1147 info->description); 1148 } else { 1149 usb_autopm_put_interface(dev->intf); 1150 } 1151 1152 /* handle link change from link resetting */ 1153 __handle_link_change(dev); 1154 } 1155 1156 if (test_bit (EVENT_LINK_CHANGE, &dev->flags)) 1157 __handle_link_change(dev); 1158 1159 if (dev->flags) 1160 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); 1161 } 1162 1163 /*-------------------------------------------------------------------------*/ 1164 1165 static void tx_complete (struct urb *urb) 1166 { 1167 struct sk_buff *skb = (struct sk_buff *) urb->context; 1168 struct skb_data *entry = (struct skb_data *) skb->cb; 1169 struct usbnet *dev = entry->dev; 1170 1171 if (urb->status == 0) { 1172 if (!(dev->driver_info->flags & FLAG_MULTI_PACKET)) 1173 dev->net->stats.tx_packets++; 1174 dev->net->stats.tx_bytes += entry->length; 1175 } else { 1176 dev->net->stats.tx_errors++; 1177 1178 switch (urb->status) { 1179 case -EPIPE: 1180 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1181 break; 1182 1183 /* software-driven interface shutdown */ 1184 case -ECONNRESET: // async unlink 1185 case -ESHUTDOWN: // hardware gone 1186 break; 1187 1188 // like rx, tx gets controller i/o faults during khubd delays 1189 // and so it uses the same throttling mechanism. 1190 case -EPROTO: 1191 case -ETIME: 1192 case -EILSEQ: 1193 usb_mark_last_busy(dev->udev); 1194 if (!timer_pending (&dev->delay)) { 1195 mod_timer (&dev->delay, 1196 jiffies + THROTTLE_JIFFIES); 1197 netif_dbg(dev, link, dev->net, 1198 "tx throttle %d\n", urb->status); 1199 } 1200 netif_stop_queue (dev->net); 1201 break; 1202 default: 1203 netif_dbg(dev, tx_err, dev->net, 1204 "tx err %d\n", entry->urb->status); 1205 break; 1206 } 1207 } 1208 1209 usb_autopm_put_interface_async(dev->intf); 1210 (void) defer_bh(dev, skb, &dev->txq, tx_done); 1211 } 1212 1213 /*-------------------------------------------------------------------------*/ 1214 1215 void usbnet_tx_timeout (struct net_device *net) 1216 { 1217 struct usbnet *dev = netdev_priv(net); 1218 1219 unlink_urbs (dev, &dev->txq); 1220 tasklet_schedule (&dev->bh); 1221 1222 // FIXME: device recovery -- reset? 1223 } 1224 EXPORT_SYMBOL_GPL(usbnet_tx_timeout); 1225 1226 /*-------------------------------------------------------------------------*/ 1227 1228 static int build_dma_sg(const struct sk_buff *skb, struct urb *urb) 1229 { 1230 unsigned num_sgs, total_len = 0; 1231 int i, s = 0; 1232 1233 num_sgs = skb_shinfo(skb)->nr_frags + 1; 1234 if (num_sgs == 1) 1235 return 0; 1236 1237 /* reserve one for zero packet */ 1238 urb->sg = kmalloc((num_sgs + 1) * sizeof(struct scatterlist), 1239 GFP_ATOMIC); 1240 if (!urb->sg) 1241 return -ENOMEM; 1242 1243 urb->num_sgs = num_sgs; 1244 sg_init_table(urb->sg, urb->num_sgs + 1); 1245 1246 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb)); 1247 total_len += skb_headlen(skb); 1248 1249 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1250 struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i]; 1251 1252 total_len += skb_frag_size(f); 1253 sg_set_page(&urb->sg[i + s], f->page.p, f->size, 1254 f->page_offset); 1255 } 1256 urb->transfer_buffer_length = total_len; 1257 1258 return 1; 1259 } 1260 1261 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, 1262 struct net_device *net) 1263 { 1264 struct usbnet *dev = netdev_priv(net); 1265 int length; 1266 struct urb *urb = NULL; 1267 struct skb_data *entry; 1268 struct driver_info *info = dev->driver_info; 1269 unsigned long flags; 1270 int retval; 1271 1272 if (skb) 1273 skb_tx_timestamp(skb); 1274 1275 // some devices want funky USB-level framing, for 1276 // win32 driver (usually) and/or hardware quirks 1277 if (info->tx_fixup) { 1278 skb = info->tx_fixup (dev, skb, GFP_ATOMIC); 1279 if (!skb) { 1280 /* packet collected; minidriver waiting for more */ 1281 if (info->flags & FLAG_MULTI_PACKET) 1282 goto not_drop; 1283 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); 1284 goto drop; 1285 } 1286 } 1287 1288 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { 1289 netif_dbg(dev, tx_err, dev->net, "no urb\n"); 1290 goto drop; 1291 } 1292 1293 entry = (struct skb_data *) skb->cb; 1294 entry->urb = urb; 1295 entry->dev = dev; 1296 1297 usb_fill_bulk_urb (urb, dev->udev, dev->out, 1298 skb->data, skb->len, tx_complete, skb); 1299 if (dev->can_dma_sg) { 1300 if (build_dma_sg(skb, urb) < 0) 1301 goto drop; 1302 } 1303 length = urb->transfer_buffer_length; 1304 1305 /* don't assume the hardware handles USB_ZERO_PACKET 1306 * NOTE: strictly conforming cdc-ether devices should expect 1307 * the ZLP here, but ignore the one-byte packet. 1308 * NOTE2: CDC NCM specification is different from CDC ECM when 1309 * handling ZLP/short packets, so cdc_ncm driver will make short 1310 * packet itself if needed. 1311 */ 1312 if (length % dev->maxpacket == 0) { 1313 if (!(info->flags & FLAG_SEND_ZLP)) { 1314 if (!(info->flags & FLAG_MULTI_PACKET)) { 1315 length++; 1316 if (skb_tailroom(skb) && !urb->num_sgs) { 1317 skb->data[skb->len] = 0; 1318 __skb_put(skb, 1); 1319 } else if (urb->num_sgs) 1320 sg_set_buf(&urb->sg[urb->num_sgs++], 1321 dev->padding_pkt, 1); 1322 } 1323 } else 1324 urb->transfer_flags |= URB_ZERO_PACKET; 1325 } 1326 entry->length = urb->transfer_buffer_length = length; 1327 1328 spin_lock_irqsave(&dev->txq.lock, flags); 1329 retval = usb_autopm_get_interface_async(dev->intf); 1330 if (retval < 0) { 1331 spin_unlock_irqrestore(&dev->txq.lock, flags); 1332 goto drop; 1333 } 1334 1335 #ifdef CONFIG_PM 1336 /* if this triggers the device is still a sleep */ 1337 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { 1338 /* transmission will be done in resume */ 1339 usb_anchor_urb(urb, &dev->deferred); 1340 /* no use to process more packets */ 1341 netif_stop_queue(net); 1342 usb_put_urb(urb); 1343 spin_unlock_irqrestore(&dev->txq.lock, flags); 1344 netdev_dbg(dev->net, "Delaying transmission for resumption\n"); 1345 goto deferred; 1346 } 1347 #endif 1348 1349 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { 1350 case -EPIPE: 1351 netif_stop_queue (net); 1352 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1353 usb_autopm_put_interface_async(dev->intf); 1354 break; 1355 default: 1356 usb_autopm_put_interface_async(dev->intf); 1357 netif_dbg(dev, tx_err, dev->net, 1358 "tx: submit urb err %d\n", retval); 1359 break; 1360 case 0: 1361 net->trans_start = jiffies; 1362 __usbnet_queue_skb(&dev->txq, skb, tx_start); 1363 if (dev->txq.qlen >= TX_QLEN (dev)) 1364 netif_stop_queue (net); 1365 } 1366 spin_unlock_irqrestore (&dev->txq.lock, flags); 1367 1368 if (retval) { 1369 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); 1370 drop: 1371 dev->net->stats.tx_dropped++; 1372 not_drop: 1373 if (skb) 1374 dev_kfree_skb_any (skb); 1375 if (urb) { 1376 kfree(urb->sg); 1377 usb_free_urb(urb); 1378 } 1379 } else 1380 netif_dbg(dev, tx_queued, dev->net, 1381 "> tx, len %d, type 0x%x\n", length, skb->protocol); 1382 #ifdef CONFIG_PM 1383 deferred: 1384 #endif 1385 return NETDEV_TX_OK; 1386 } 1387 EXPORT_SYMBOL_GPL(usbnet_start_xmit); 1388 1389 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags) 1390 { 1391 struct urb *urb; 1392 int i; 1393 int ret = 0; 1394 1395 /* don't refill the queue all at once */ 1396 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) { 1397 urb = usb_alloc_urb(0, flags); 1398 if (urb != NULL) { 1399 ret = rx_submit(dev, urb, flags); 1400 if (ret) 1401 goto err; 1402 } else { 1403 ret = -ENOMEM; 1404 goto err; 1405 } 1406 } 1407 err: 1408 return ret; 1409 } 1410 1411 /*-------------------------------------------------------------------------*/ 1412 1413 // tasklet (work deferred from completions, in_irq) or timer 1414 1415 static void usbnet_bh (unsigned long param) 1416 { 1417 struct usbnet *dev = (struct usbnet *) param; 1418 struct sk_buff *skb; 1419 struct skb_data *entry; 1420 1421 while ((skb = skb_dequeue (&dev->done))) { 1422 entry = (struct skb_data *) skb->cb; 1423 switch (entry->state) { 1424 case rx_done: 1425 entry->state = rx_cleanup; 1426 rx_process (dev, skb); 1427 continue; 1428 case tx_done: 1429 kfree(entry->urb->sg); 1430 case rx_cleanup: 1431 usb_free_urb (entry->urb); 1432 dev_kfree_skb (skb); 1433 continue; 1434 default: 1435 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); 1436 } 1437 } 1438 1439 /* restart RX again after disabling due to high error rate */ 1440 clear_bit(EVENT_RX_KILL, &dev->flags); 1441 1442 /* waiting for all pending urbs to complete? 1443 * only then can we forgo submitting anew 1444 */ 1445 if (waitqueue_active(&dev->wait)) { 1446 if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0) 1447 wake_up_all(&dev->wait); 1448 1449 // or are we maybe short a few urbs? 1450 } else if (netif_running (dev->net) && 1451 netif_device_present (dev->net) && 1452 netif_carrier_ok(dev->net) && 1453 !timer_pending (&dev->delay) && 1454 !test_bit (EVENT_RX_HALT, &dev->flags)) { 1455 int temp = dev->rxq.qlen; 1456 1457 if (temp < RX_QLEN(dev)) { 1458 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK) 1459 return; 1460 if (temp != dev->rxq.qlen) 1461 netif_dbg(dev, link, dev->net, 1462 "rxqlen %d --> %d\n", 1463 temp, dev->rxq.qlen); 1464 if (dev->rxq.qlen < RX_QLEN(dev)) 1465 tasklet_schedule (&dev->bh); 1466 } 1467 if (dev->txq.qlen < TX_QLEN (dev)) 1468 netif_wake_queue (dev->net); 1469 } 1470 } 1471 1472 1473 /*------------------------------------------------------------------------- 1474 * 1475 * USB Device Driver support 1476 * 1477 *-------------------------------------------------------------------------*/ 1478 1479 // precondition: never called in_interrupt 1480 1481 void usbnet_disconnect (struct usb_interface *intf) 1482 { 1483 struct usbnet *dev; 1484 struct usb_device *xdev; 1485 struct net_device *net; 1486 1487 dev = usb_get_intfdata(intf); 1488 usb_set_intfdata(intf, NULL); 1489 if (!dev) 1490 return; 1491 1492 xdev = interface_to_usbdev (intf); 1493 1494 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", 1495 intf->dev.driver->name, 1496 xdev->bus->bus_name, xdev->devpath, 1497 dev->driver_info->description); 1498 1499 net = dev->net; 1500 unregister_netdev (net); 1501 1502 cancel_work_sync(&dev->kevent); 1503 1504 usb_scuttle_anchored_urbs(&dev->deferred); 1505 1506 if (dev->driver_info->unbind) 1507 dev->driver_info->unbind (dev, intf); 1508 1509 usb_kill_urb(dev->interrupt); 1510 usb_free_urb(dev->interrupt); 1511 kfree(dev->padding_pkt); 1512 1513 free_netdev(net); 1514 } 1515 EXPORT_SYMBOL_GPL(usbnet_disconnect); 1516 1517 static const struct net_device_ops usbnet_netdev_ops = { 1518 .ndo_open = usbnet_open, 1519 .ndo_stop = usbnet_stop, 1520 .ndo_start_xmit = usbnet_start_xmit, 1521 .ndo_tx_timeout = usbnet_tx_timeout, 1522 .ndo_change_mtu = usbnet_change_mtu, 1523 .ndo_set_mac_address = eth_mac_addr, 1524 .ndo_validate_addr = eth_validate_addr, 1525 }; 1526 1527 /*-------------------------------------------------------------------------*/ 1528 1529 // precondition: never called in_interrupt 1530 1531 static struct device_type wlan_type = { 1532 .name = "wlan", 1533 }; 1534 1535 static struct device_type wwan_type = { 1536 .name = "wwan", 1537 }; 1538 1539 int 1540 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) 1541 { 1542 struct usbnet *dev; 1543 struct net_device *net; 1544 struct usb_host_interface *interface; 1545 struct driver_info *info; 1546 struct usb_device *xdev; 1547 int status; 1548 const char *name; 1549 struct usb_driver *driver = to_usb_driver(udev->dev.driver); 1550 1551 /* usbnet already took usb runtime pm, so have to enable the feature 1552 * for usb interface, otherwise usb_autopm_get_interface may return 1553 * failure if RUNTIME_PM is enabled. 1554 */ 1555 if (!driver->supports_autosuspend) { 1556 driver->supports_autosuspend = 1; 1557 pm_runtime_enable(&udev->dev); 1558 } 1559 1560 name = udev->dev.driver->name; 1561 info = (struct driver_info *) prod->driver_info; 1562 if (!info) { 1563 dev_dbg (&udev->dev, "blacklisted by %s\n", name); 1564 return -ENODEV; 1565 } 1566 xdev = interface_to_usbdev (udev); 1567 interface = udev->cur_altsetting; 1568 1569 status = -ENOMEM; 1570 1571 // set up our own records 1572 net = alloc_etherdev(sizeof(*dev)); 1573 if (!net) 1574 goto out; 1575 1576 /* netdev_printk() needs this so do it as early as possible */ 1577 SET_NETDEV_DEV(net, &udev->dev); 1578 1579 dev = netdev_priv(net); 1580 dev->udev = xdev; 1581 dev->intf = udev; 1582 dev->driver_info = info; 1583 dev->driver_name = name; 1584 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV 1585 | NETIF_MSG_PROBE | NETIF_MSG_LINK); 1586 init_waitqueue_head(&dev->wait); 1587 skb_queue_head_init (&dev->rxq); 1588 skb_queue_head_init (&dev->txq); 1589 skb_queue_head_init (&dev->done); 1590 skb_queue_head_init(&dev->rxq_pause); 1591 dev->bh.func = usbnet_bh; 1592 dev->bh.data = (unsigned long) dev; 1593 INIT_WORK (&dev->kevent, kevent); 1594 init_usb_anchor(&dev->deferred); 1595 dev->delay.function = usbnet_bh; 1596 dev->delay.data = (unsigned long) dev; 1597 init_timer (&dev->delay); 1598 mutex_init (&dev->phy_mutex); 1599 mutex_init(&dev->interrupt_mutex); 1600 dev->interrupt_count = 0; 1601 1602 dev->net = net; 1603 strcpy (net->name, "usb%d"); 1604 memcpy (net->dev_addr, node_id, sizeof node_id); 1605 1606 /* rx and tx sides can use different message sizes; 1607 * bind() should set rx_urb_size in that case. 1608 */ 1609 dev->hard_mtu = net->mtu + net->hard_header_len; 1610 #if 0 1611 // dma_supported() is deeply broken on almost all architectures 1612 // possible with some EHCI controllers 1613 if (dma_supported (&udev->dev, DMA_BIT_MASK(64))) 1614 net->features |= NETIF_F_HIGHDMA; 1615 #endif 1616 1617 net->netdev_ops = &usbnet_netdev_ops; 1618 net->watchdog_timeo = TX_TIMEOUT_JIFFIES; 1619 net->ethtool_ops = &usbnet_ethtool_ops; 1620 1621 // allow device-specific bind/init procedures 1622 // NOTE net->name still not usable ... 1623 if (info->bind) { 1624 status = info->bind (dev, udev); 1625 if (status < 0) 1626 goto out1; 1627 1628 // heuristic: "usb%d" for links we know are two-host, 1629 // else "eth%d" when there's reasonable doubt. userspace 1630 // can rename the link if it knows better. 1631 if ((dev->driver_info->flags & FLAG_ETHER) != 0 && 1632 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 || 1633 (net->dev_addr [0] & 0x02) == 0)) 1634 strcpy (net->name, "eth%d"); 1635 /* WLAN devices should always be named "wlan%d" */ 1636 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1637 strcpy(net->name, "wlan%d"); 1638 /* WWAN devices should always be named "wwan%d" */ 1639 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1640 strcpy(net->name, "wwan%d"); 1641 1642 /* devices that cannot do ARP */ 1643 if ((dev->driver_info->flags & FLAG_NOARP) != 0) 1644 net->flags |= IFF_NOARP; 1645 1646 /* maybe the remote can't receive an Ethernet MTU */ 1647 if (net->mtu > (dev->hard_mtu - net->hard_header_len)) 1648 net->mtu = dev->hard_mtu - net->hard_header_len; 1649 } else if (!info->in || !info->out) 1650 status = usbnet_get_endpoints (dev, udev); 1651 else { 1652 dev->in = usb_rcvbulkpipe (xdev, info->in); 1653 dev->out = usb_sndbulkpipe (xdev, info->out); 1654 if (!(info->flags & FLAG_NO_SETINT)) 1655 status = usb_set_interface (xdev, 1656 interface->desc.bInterfaceNumber, 1657 interface->desc.bAlternateSetting); 1658 else 1659 status = 0; 1660 1661 } 1662 if (status >= 0 && dev->status) 1663 status = init_status (dev, udev); 1664 if (status < 0) 1665 goto out3; 1666 1667 if (!dev->rx_urb_size) 1668 dev->rx_urb_size = dev->hard_mtu; 1669 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); 1670 1671 /* let userspace know we have a random address */ 1672 if (ether_addr_equal(net->dev_addr, node_id)) 1673 net->addr_assign_type = NET_ADDR_RANDOM; 1674 1675 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1676 SET_NETDEV_DEVTYPE(net, &wlan_type); 1677 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1678 SET_NETDEV_DEVTYPE(net, &wwan_type); 1679 1680 /* initialize max rx_qlen and tx_qlen */ 1681 usbnet_update_max_qlen(dev); 1682 1683 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) && 1684 !(info->flags & FLAG_MULTI_PACKET)) { 1685 dev->padding_pkt = kzalloc(1, GFP_KERNEL); 1686 if (!dev->padding_pkt) { 1687 status = -ENOMEM; 1688 goto out4; 1689 } 1690 } 1691 1692 status = register_netdev (net); 1693 if (status) 1694 goto out5; 1695 netif_info(dev, probe, dev->net, 1696 "register '%s' at usb-%s-%s, %s, %pM\n", 1697 udev->dev.driver->name, 1698 xdev->bus->bus_name, xdev->devpath, 1699 dev->driver_info->description, 1700 net->dev_addr); 1701 1702 // ok, it's ready to go. 1703 usb_set_intfdata (udev, dev); 1704 1705 netif_device_attach (net); 1706 1707 if (dev->driver_info->flags & FLAG_LINK_INTR) 1708 usbnet_link_change(dev, 0, 0); 1709 1710 return 0; 1711 1712 out5: 1713 kfree(dev->padding_pkt); 1714 out4: 1715 usb_free_urb(dev->interrupt); 1716 out3: 1717 if (info->unbind) 1718 info->unbind (dev, udev); 1719 out1: 1720 free_netdev(net); 1721 out: 1722 return status; 1723 } 1724 EXPORT_SYMBOL_GPL(usbnet_probe); 1725 1726 /*-------------------------------------------------------------------------*/ 1727 1728 /* 1729 * suspend the whole driver as soon as the first interface is suspended 1730 * resume only when the last interface is resumed 1731 */ 1732 1733 int usbnet_suspend (struct usb_interface *intf, pm_message_t message) 1734 { 1735 struct usbnet *dev = usb_get_intfdata(intf); 1736 1737 if (!dev->suspend_count++) { 1738 spin_lock_irq(&dev->txq.lock); 1739 /* don't autosuspend while transmitting */ 1740 if (dev->txq.qlen && PMSG_IS_AUTO(message)) { 1741 dev->suspend_count--; 1742 spin_unlock_irq(&dev->txq.lock); 1743 return -EBUSY; 1744 } else { 1745 set_bit(EVENT_DEV_ASLEEP, &dev->flags); 1746 spin_unlock_irq(&dev->txq.lock); 1747 } 1748 /* 1749 * accelerate emptying of the rx and queues, to avoid 1750 * having everything error out. 1751 */ 1752 netif_device_detach (dev->net); 1753 usbnet_terminate_urbs(dev); 1754 __usbnet_status_stop_force(dev); 1755 1756 /* 1757 * reattach so runtime management can use and 1758 * wake the device 1759 */ 1760 netif_device_attach (dev->net); 1761 } 1762 return 0; 1763 } 1764 EXPORT_SYMBOL_GPL(usbnet_suspend); 1765 1766 int usbnet_resume (struct usb_interface *intf) 1767 { 1768 struct usbnet *dev = usb_get_intfdata(intf); 1769 struct sk_buff *skb; 1770 struct urb *res; 1771 int retval; 1772 1773 if (!--dev->suspend_count) { 1774 /* resume interrupt URB if it was previously submitted */ 1775 __usbnet_status_start_force(dev, GFP_NOIO); 1776 1777 spin_lock_irq(&dev->txq.lock); 1778 while ((res = usb_get_from_anchor(&dev->deferred))) { 1779 1780 skb = (struct sk_buff *)res->context; 1781 retval = usb_submit_urb(res, GFP_ATOMIC); 1782 if (retval < 0) { 1783 dev_kfree_skb_any(skb); 1784 kfree(res->sg); 1785 usb_free_urb(res); 1786 usb_autopm_put_interface_async(dev->intf); 1787 } else { 1788 dev->net->trans_start = jiffies; 1789 __skb_queue_tail(&dev->txq, skb); 1790 } 1791 } 1792 1793 smp_mb(); 1794 clear_bit(EVENT_DEV_ASLEEP, &dev->flags); 1795 spin_unlock_irq(&dev->txq.lock); 1796 1797 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) { 1798 /* handle remote wakeup ASAP 1799 * we cannot race against stop 1800 */ 1801 if (netif_device_present(dev->net) && 1802 !timer_pending(&dev->delay) && 1803 !test_bit(EVENT_RX_HALT, &dev->flags)) 1804 rx_alloc_submit(dev, GFP_NOIO); 1805 1806 if (!(dev->txq.qlen >= TX_QLEN(dev))) 1807 netif_tx_wake_all_queues(dev->net); 1808 tasklet_schedule (&dev->bh); 1809 } 1810 } 1811 1812 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) 1813 usb_autopm_get_interface_no_resume(intf); 1814 1815 return 0; 1816 } 1817 EXPORT_SYMBOL_GPL(usbnet_resume); 1818 1819 /* 1820 * Either a subdriver implements manage_power, then it is assumed to always 1821 * be ready to be suspended or it reports the readiness to be suspended 1822 * explicitly 1823 */ 1824 void usbnet_device_suggests_idle(struct usbnet *dev) 1825 { 1826 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) { 1827 dev->intf->needs_remote_wakeup = 1; 1828 usb_autopm_put_interface_async(dev->intf); 1829 } 1830 } 1831 EXPORT_SYMBOL(usbnet_device_suggests_idle); 1832 1833 /* 1834 * For devices that can do without special commands 1835 */ 1836 int usbnet_manage_power(struct usbnet *dev, int on) 1837 { 1838 dev->intf->needs_remote_wakeup = on; 1839 return 0; 1840 } 1841 EXPORT_SYMBOL(usbnet_manage_power); 1842 1843 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset) 1844 { 1845 /* update link after link is reseted */ 1846 if (link && !need_reset) 1847 netif_carrier_on(dev->net); 1848 else 1849 netif_carrier_off(dev->net); 1850 1851 if (need_reset && link) 1852 usbnet_defer_kevent(dev, EVENT_LINK_RESET); 1853 else 1854 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE); 1855 } 1856 EXPORT_SYMBOL(usbnet_link_change); 1857 1858 /*-------------------------------------------------------------------------*/ 1859 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1860 u16 value, u16 index, void *data, u16 size) 1861 { 1862 void *buf = NULL; 1863 int err = -ENOMEM; 1864 1865 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x" 1866 " value=0x%04x index=0x%04x size=%d\n", 1867 cmd, reqtype, value, index, size); 1868 1869 if (data) { 1870 buf = kmalloc(size, GFP_KERNEL); 1871 if (!buf) 1872 goto out; 1873 } 1874 1875 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), 1876 cmd, reqtype, value, index, buf, size, 1877 USB_CTRL_GET_TIMEOUT); 1878 if (err > 0 && err <= size) 1879 memcpy(data, buf, err); 1880 kfree(buf); 1881 out: 1882 return err; 1883 } 1884 1885 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1886 u16 value, u16 index, const void *data, 1887 u16 size) 1888 { 1889 void *buf = NULL; 1890 int err = -ENOMEM; 1891 1892 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 1893 " value=0x%04x index=0x%04x size=%d\n", 1894 cmd, reqtype, value, index, size); 1895 1896 if (data) { 1897 buf = kmemdup(data, size, GFP_KERNEL); 1898 if (!buf) 1899 goto out; 1900 } 1901 1902 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), 1903 cmd, reqtype, value, index, buf, size, 1904 USB_CTRL_SET_TIMEOUT); 1905 kfree(buf); 1906 1907 out: 1908 return err; 1909 } 1910 1911 /* 1912 * The function can't be called inside suspend/resume callback, 1913 * otherwise deadlock will be caused. 1914 */ 1915 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1916 u16 value, u16 index, void *data, u16 size) 1917 { 1918 int ret; 1919 1920 if (usb_autopm_get_interface(dev->intf) < 0) 1921 return -ENODEV; 1922 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index, 1923 data, size); 1924 usb_autopm_put_interface(dev->intf); 1925 return ret; 1926 } 1927 EXPORT_SYMBOL_GPL(usbnet_read_cmd); 1928 1929 /* 1930 * The function can't be called inside suspend/resume callback, 1931 * otherwise deadlock will be caused. 1932 */ 1933 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1934 u16 value, u16 index, const void *data, u16 size) 1935 { 1936 int ret; 1937 1938 if (usb_autopm_get_interface(dev->intf) < 0) 1939 return -ENODEV; 1940 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index, 1941 data, size); 1942 usb_autopm_put_interface(dev->intf); 1943 return ret; 1944 } 1945 EXPORT_SYMBOL_GPL(usbnet_write_cmd); 1946 1947 /* 1948 * The function can be called inside suspend/resume callback safely 1949 * and should only be called by suspend/resume callback generally. 1950 */ 1951 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 1952 u16 value, u16 index, void *data, u16 size) 1953 { 1954 return __usbnet_read_cmd(dev, cmd, reqtype, value, index, 1955 data, size); 1956 } 1957 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm); 1958 1959 /* 1960 * The function can be called inside suspend/resume callback safely 1961 * and should only be called by suspend/resume callback generally. 1962 */ 1963 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 1964 u16 value, u16 index, const void *data, 1965 u16 size) 1966 { 1967 return __usbnet_write_cmd(dev, cmd, reqtype, value, index, 1968 data, size); 1969 } 1970 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm); 1971 1972 static void usbnet_async_cmd_cb(struct urb *urb) 1973 { 1974 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context; 1975 int status = urb->status; 1976 1977 if (status < 0) 1978 dev_dbg(&urb->dev->dev, "%s failed with %d", 1979 __func__, status); 1980 1981 kfree(req); 1982 usb_free_urb(urb); 1983 } 1984 1985 /* 1986 * The caller must make sure that device can't be put into suspend 1987 * state until the control URB completes. 1988 */ 1989 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype, 1990 u16 value, u16 index, const void *data, u16 size) 1991 { 1992 struct usb_ctrlrequest *req = NULL; 1993 struct urb *urb; 1994 int err = -ENOMEM; 1995 void *buf = NULL; 1996 1997 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 1998 " value=0x%04x index=0x%04x size=%d\n", 1999 cmd, reqtype, value, index, size); 2000 2001 urb = usb_alloc_urb(0, GFP_ATOMIC); 2002 if (!urb) { 2003 netdev_err(dev->net, "Error allocating URB in" 2004 " %s!\n", __func__); 2005 goto fail; 2006 } 2007 2008 if (data) { 2009 buf = kmemdup(data, size, GFP_ATOMIC); 2010 if (!buf) { 2011 netdev_err(dev->net, "Error allocating buffer" 2012 " in %s!\n", __func__); 2013 goto fail_free; 2014 } 2015 } 2016 2017 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC); 2018 if (!req) 2019 goto fail_free_buf; 2020 2021 req->bRequestType = reqtype; 2022 req->bRequest = cmd; 2023 req->wValue = cpu_to_le16(value); 2024 req->wIndex = cpu_to_le16(index); 2025 req->wLength = cpu_to_le16(size); 2026 2027 usb_fill_control_urb(urb, dev->udev, 2028 usb_sndctrlpipe(dev->udev, 0), 2029 (void *)req, buf, size, 2030 usbnet_async_cmd_cb, req); 2031 urb->transfer_flags |= URB_FREE_BUFFER; 2032 2033 err = usb_submit_urb(urb, GFP_ATOMIC); 2034 if (err < 0) { 2035 netdev_err(dev->net, "Error submitting the control" 2036 " message: status=%d\n", err); 2037 goto fail_free; 2038 } 2039 return 0; 2040 2041 fail_free_buf: 2042 kfree(buf); 2043 fail_free: 2044 kfree(req); 2045 usb_free_urb(urb); 2046 fail: 2047 return err; 2048 2049 } 2050 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async); 2051 /*-------------------------------------------------------------------------*/ 2052 2053 static int __init usbnet_init(void) 2054 { 2055 /* Compiler should optimize this out. */ 2056 BUILD_BUG_ON( 2057 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data)); 2058 2059 eth_random_addr(node_id); 2060 return 0; 2061 } 2062 module_init(usbnet_init); 2063 2064 static void __exit usbnet_exit(void) 2065 { 2066 } 2067 module_exit(usbnet_exit); 2068 2069 MODULE_AUTHOR("David Brownell"); 2070 MODULE_DESCRIPTION("USB network driver framework"); 2071 MODULE_LICENSE("GPL"); 2072