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/usb/cdc.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 hub_wq might disconnect() 74 * us (it polls at HZ/4 usually) before we report too many false errors. 75 */ 76 #define THROTTLE_JIFFIES (HZ/8) 77 78 // between wakeups 79 #define UNLINK_TIMEOUT_MS 3 80 81 /*-------------------------------------------------------------------------*/ 82 83 // randomly generated ethernet address 84 static u8 node_id [ETH_ALEN]; 85 86 static const char driver_name [] = "usbnet"; 87 88 /* use ethtool to change the level for any given device */ 89 static int msg_level = -1; 90 module_param (msg_level, int, 0); 91 MODULE_PARM_DESC (msg_level, "Override default message level"); 92 93 /*-------------------------------------------------------------------------*/ 94 95 /* handles CDC Ethernet and many other network "bulk data" interfaces */ 96 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf) 97 { 98 int tmp; 99 struct usb_host_interface *alt = NULL; 100 struct usb_host_endpoint *in = NULL, *out = NULL; 101 struct usb_host_endpoint *status = NULL; 102 103 for (tmp = 0; tmp < intf->num_altsetting; tmp++) { 104 unsigned ep; 105 106 in = out = status = NULL; 107 alt = intf->altsetting + tmp; 108 109 /* take the first altsetting with in-bulk + out-bulk; 110 * remember any status endpoint, just in case; 111 * ignore other endpoints and altsettings. 112 */ 113 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) { 114 struct usb_host_endpoint *e; 115 int intr = 0; 116 117 e = alt->endpoint + ep; 118 switch (e->desc.bmAttributes) { 119 case USB_ENDPOINT_XFER_INT: 120 if (!usb_endpoint_dir_in(&e->desc)) 121 continue; 122 intr = 1; 123 /* FALLTHROUGH */ 124 case USB_ENDPOINT_XFER_BULK: 125 break; 126 default: 127 continue; 128 } 129 if (usb_endpoint_dir_in(&e->desc)) { 130 if (!intr && !in) 131 in = e; 132 else if (intr && !status) 133 status = e; 134 } else { 135 if (!out) 136 out = e; 137 } 138 } 139 if (in && out) 140 break; 141 } 142 if (!alt || !in || !out) 143 return -EINVAL; 144 145 if (alt->desc.bAlternateSetting != 0 || 146 !(dev->driver_info->flags & FLAG_NO_SETINT)) { 147 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber, 148 alt->desc.bAlternateSetting); 149 if (tmp < 0) 150 return tmp; 151 } 152 153 dev->in = usb_rcvbulkpipe (dev->udev, 154 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 155 dev->out = usb_sndbulkpipe (dev->udev, 156 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 157 dev->status = status; 158 return 0; 159 } 160 EXPORT_SYMBOL_GPL(usbnet_get_endpoints); 161 162 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress) 163 { 164 int tmp = -1, ret; 165 unsigned char buf [13]; 166 167 ret = usb_string(dev->udev, iMACAddress, buf, sizeof buf); 168 if (ret == 12) 169 tmp = hex2bin(dev->net->dev_addr, buf, 6); 170 if (tmp < 0) { 171 dev_dbg(&dev->udev->dev, 172 "bad MAC string %d fetch, %d\n", iMACAddress, tmp); 173 if (ret >= 0) 174 ret = -EINVAL; 175 return ret; 176 } 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 /* only update if unset to allow minidriver rx_fixup override */ 328 if (skb->protocol == 0) 329 skb->protocol = eth_type_trans (skb, dev->net); 330 331 dev->net->stats.rx_packets++; 332 dev->net->stats.rx_bytes += skb->len; 333 334 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n", 335 skb->len + sizeof (struct ethhdr), skb->protocol); 336 memset (skb->cb, 0, sizeof (struct skb_data)); 337 338 if (skb_defer_rx_timestamp(skb)) 339 return; 340 341 status = netif_rx (skb); 342 if (status != NET_RX_SUCCESS) 343 netif_dbg(dev, rx_err, dev->net, 344 "netif_rx status %d\n", status); 345 } 346 EXPORT_SYMBOL_GPL(usbnet_skb_return); 347 348 /* must be called if hard_mtu or rx_urb_size changed */ 349 void usbnet_update_max_qlen(struct usbnet *dev) 350 { 351 enum usb_device_speed speed = dev->udev->speed; 352 353 switch (speed) { 354 case USB_SPEED_HIGH: 355 dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size; 356 dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu; 357 break; 358 case USB_SPEED_SUPER: 359 case USB_SPEED_SUPER_PLUS: 360 /* 361 * Not take default 5ms qlen for super speed HC to 362 * save memory, and iperf tests show 2.5ms qlen can 363 * work well 364 */ 365 dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size; 366 dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu; 367 break; 368 default: 369 dev->rx_qlen = dev->tx_qlen = 4; 370 } 371 } 372 EXPORT_SYMBOL_GPL(usbnet_update_max_qlen); 373 374 375 /*------------------------------------------------------------------------- 376 * 377 * Network Device Driver (peer link to "Host Device", from USB host) 378 * 379 *-------------------------------------------------------------------------*/ 380 381 int usbnet_change_mtu (struct net_device *net, int new_mtu) 382 { 383 struct usbnet *dev = netdev_priv(net); 384 int ll_mtu = new_mtu + net->hard_header_len; 385 int old_hard_mtu = dev->hard_mtu; 386 int old_rx_urb_size = dev->rx_urb_size; 387 388 if (new_mtu <= 0) 389 return -EINVAL; 390 // no second zero-length packet read wanted after mtu-sized packets 391 if ((ll_mtu % dev->maxpacket) == 0) 392 return -EDOM; 393 net->mtu = new_mtu; 394 395 dev->hard_mtu = net->mtu + net->hard_header_len; 396 if (dev->rx_urb_size == old_hard_mtu) { 397 dev->rx_urb_size = dev->hard_mtu; 398 if (dev->rx_urb_size > old_rx_urb_size) 399 usbnet_unlink_rx_urbs(dev); 400 } 401 402 /* max qlen depend on hard_mtu and rx_urb_size */ 403 usbnet_update_max_qlen(dev); 404 405 return 0; 406 } 407 EXPORT_SYMBOL_GPL(usbnet_change_mtu); 408 409 /* The caller must hold list->lock */ 410 static void __usbnet_queue_skb(struct sk_buff_head *list, 411 struct sk_buff *newsk, enum skb_state state) 412 { 413 struct skb_data *entry = (struct skb_data *) newsk->cb; 414 415 __skb_queue_tail(list, newsk); 416 entry->state = state; 417 } 418 419 /*-------------------------------------------------------------------------*/ 420 421 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from 422 * completion callbacks. 2.5 should have fixed those bugs... 423 */ 424 425 static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb, 426 struct sk_buff_head *list, enum skb_state state) 427 { 428 unsigned long flags; 429 enum skb_state old_state; 430 struct skb_data *entry = (struct skb_data *) skb->cb; 431 432 spin_lock_irqsave(&list->lock, flags); 433 old_state = entry->state; 434 entry->state = state; 435 __skb_unlink(skb, list); 436 437 /* defer_bh() is never called with list == &dev->done. 438 * spin_lock_nested() tells lockdep that it is OK to take 439 * dev->done.lock here with list->lock held. 440 */ 441 spin_lock_nested(&dev->done.lock, SINGLE_DEPTH_NESTING); 442 443 __skb_queue_tail(&dev->done, skb); 444 if (dev->done.qlen == 1) 445 tasklet_schedule(&dev->bh); 446 spin_unlock(&dev->done.lock); 447 spin_unlock_irqrestore(&list->lock, flags); 448 return old_state; 449 } 450 451 /* some work can't be done in tasklets, so we use keventd 452 * 453 * NOTE: annoying asymmetry: if it's active, schedule_work() fails, 454 * but tasklet_schedule() doesn't. hope the failure is rare. 455 */ 456 void usbnet_defer_kevent (struct usbnet *dev, int work) 457 { 458 set_bit (work, &dev->flags); 459 if (!schedule_work (&dev->kevent)) { 460 if (net_ratelimit()) 461 netdev_err(dev->net, "kevent %d may have been dropped\n", work); 462 } else { 463 netdev_dbg(dev->net, "kevent %d scheduled\n", work); 464 } 465 } 466 EXPORT_SYMBOL_GPL(usbnet_defer_kevent); 467 468 /*-------------------------------------------------------------------------*/ 469 470 static void rx_complete (struct urb *urb); 471 472 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) 473 { 474 struct sk_buff *skb; 475 struct skb_data *entry; 476 int retval = 0; 477 unsigned long lockflags; 478 size_t size = dev->rx_urb_size; 479 480 /* prevent rx skb allocation when error ratio is high */ 481 if (test_bit(EVENT_RX_KILL, &dev->flags)) { 482 usb_free_urb(urb); 483 return -ENOLINK; 484 } 485 486 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags); 487 if (!skb) { 488 netif_dbg(dev, rx_err, dev->net, "no rx skb\n"); 489 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 490 usb_free_urb (urb); 491 return -ENOMEM; 492 } 493 494 entry = (struct skb_data *) skb->cb; 495 entry->urb = urb; 496 entry->dev = dev; 497 entry->length = 0; 498 499 usb_fill_bulk_urb (urb, dev->udev, dev->in, 500 skb->data, size, rx_complete, skb); 501 502 spin_lock_irqsave (&dev->rxq.lock, lockflags); 503 504 if (netif_running (dev->net) && 505 netif_device_present (dev->net) && 506 !test_bit (EVENT_RX_HALT, &dev->flags) && 507 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) { 508 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) { 509 case -EPIPE: 510 usbnet_defer_kevent (dev, EVENT_RX_HALT); 511 break; 512 case -ENOMEM: 513 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 514 break; 515 case -ENODEV: 516 netif_dbg(dev, ifdown, dev->net, "device gone\n"); 517 netif_device_detach (dev->net); 518 break; 519 case -EHOSTUNREACH: 520 retval = -ENOLINK; 521 break; 522 default: 523 netif_dbg(dev, rx_err, dev->net, 524 "rx submit, %d\n", retval); 525 tasklet_schedule (&dev->bh); 526 break; 527 case 0: 528 __usbnet_queue_skb(&dev->rxq, skb, rx_start); 529 } 530 } else { 531 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n"); 532 retval = -ENOLINK; 533 } 534 spin_unlock_irqrestore (&dev->rxq.lock, lockflags); 535 if (retval) { 536 dev_kfree_skb_any (skb); 537 usb_free_urb (urb); 538 } 539 return retval; 540 } 541 542 543 /*-------------------------------------------------------------------------*/ 544 545 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb) 546 { 547 if (dev->driver_info->rx_fixup && 548 !dev->driver_info->rx_fixup (dev, skb)) { 549 /* With RX_ASSEMBLE, rx_fixup() must update counters */ 550 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE)) 551 dev->net->stats.rx_errors++; 552 goto done; 553 } 554 // else network stack removes extra byte if we forced a short packet 555 556 /* all data was already cloned from skb inside the driver */ 557 if (dev->driver_info->flags & FLAG_MULTI_PACKET) 558 goto done; 559 560 if (skb->len < ETH_HLEN) { 561 dev->net->stats.rx_errors++; 562 dev->net->stats.rx_length_errors++; 563 netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len); 564 } else { 565 usbnet_skb_return(dev, skb); 566 return; 567 } 568 569 done: 570 skb_queue_tail(&dev->done, skb); 571 } 572 573 /*-------------------------------------------------------------------------*/ 574 575 static void rx_complete (struct urb *urb) 576 { 577 struct sk_buff *skb = (struct sk_buff *) urb->context; 578 struct skb_data *entry = (struct skb_data *) skb->cb; 579 struct usbnet *dev = entry->dev; 580 int urb_status = urb->status; 581 enum skb_state state; 582 583 skb_put (skb, urb->actual_length); 584 state = rx_done; 585 entry->urb = NULL; 586 587 switch (urb_status) { 588 /* success */ 589 case 0: 590 break; 591 592 /* stalls need manual reset. this is rare ... except that 593 * when going through USB 2.0 TTs, unplug appears this way. 594 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ 595 * storm, recovering as needed. 596 */ 597 case -EPIPE: 598 dev->net->stats.rx_errors++; 599 usbnet_defer_kevent (dev, EVENT_RX_HALT); 600 // FALLTHROUGH 601 602 /* software-driven interface shutdown */ 603 case -ECONNRESET: /* async unlink */ 604 case -ESHUTDOWN: /* hardware gone */ 605 netif_dbg(dev, ifdown, dev->net, 606 "rx shutdown, code %d\n", urb_status); 607 goto block; 608 609 /* we get controller i/o faults during hub_wq disconnect() delays. 610 * throttle down resubmits, to avoid log floods; just temporarily, 611 * so we still recover when the fault isn't a hub_wq delay. 612 */ 613 case -EPROTO: 614 case -ETIME: 615 case -EILSEQ: 616 dev->net->stats.rx_errors++; 617 if (!timer_pending (&dev->delay)) { 618 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); 619 netif_dbg(dev, link, dev->net, 620 "rx throttle %d\n", urb_status); 621 } 622 block: 623 state = rx_cleanup; 624 entry->urb = urb; 625 urb = NULL; 626 break; 627 628 /* data overrun ... flush fifo? */ 629 case -EOVERFLOW: 630 dev->net->stats.rx_over_errors++; 631 // FALLTHROUGH 632 633 default: 634 state = rx_cleanup; 635 dev->net->stats.rx_errors++; 636 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status); 637 break; 638 } 639 640 /* stop rx if packet error rate is high */ 641 if (++dev->pkt_cnt > 30) { 642 dev->pkt_cnt = 0; 643 dev->pkt_err = 0; 644 } else { 645 if (state == rx_cleanup) 646 dev->pkt_err++; 647 if (dev->pkt_err > 20) 648 set_bit(EVENT_RX_KILL, &dev->flags); 649 } 650 651 state = defer_bh(dev, skb, &dev->rxq, state); 652 653 if (urb) { 654 if (netif_running (dev->net) && 655 !test_bit (EVENT_RX_HALT, &dev->flags) && 656 state != unlink_start) { 657 rx_submit (dev, urb, GFP_ATOMIC); 658 usb_mark_last_busy(dev->udev); 659 return; 660 } 661 usb_free_urb (urb); 662 } 663 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n"); 664 } 665 666 /*-------------------------------------------------------------------------*/ 667 void usbnet_pause_rx(struct usbnet *dev) 668 { 669 set_bit(EVENT_RX_PAUSED, &dev->flags); 670 671 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n"); 672 } 673 EXPORT_SYMBOL_GPL(usbnet_pause_rx); 674 675 void usbnet_resume_rx(struct usbnet *dev) 676 { 677 struct sk_buff *skb; 678 int num = 0; 679 680 clear_bit(EVENT_RX_PAUSED, &dev->flags); 681 682 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) { 683 usbnet_skb_return(dev, skb); 684 num++; 685 } 686 687 tasklet_schedule(&dev->bh); 688 689 netif_dbg(dev, rx_status, dev->net, 690 "paused rx queue disabled, %d skbs requeued\n", num); 691 } 692 EXPORT_SYMBOL_GPL(usbnet_resume_rx); 693 694 void usbnet_purge_paused_rxq(struct usbnet *dev) 695 { 696 skb_queue_purge(&dev->rxq_pause); 697 } 698 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq); 699 700 /*-------------------------------------------------------------------------*/ 701 702 // unlink pending rx/tx; completion handlers do all other cleanup 703 704 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) 705 { 706 unsigned long flags; 707 struct sk_buff *skb; 708 int count = 0; 709 710 spin_lock_irqsave (&q->lock, flags); 711 while (!skb_queue_empty(q)) { 712 struct skb_data *entry; 713 struct urb *urb; 714 int retval; 715 716 skb_queue_walk(q, skb) { 717 entry = (struct skb_data *) skb->cb; 718 if (entry->state != unlink_start) 719 goto found; 720 } 721 break; 722 found: 723 entry->state = unlink_start; 724 urb = entry->urb; 725 726 /* 727 * Get reference count of the URB to avoid it to be 728 * freed during usb_unlink_urb, which may trigger 729 * use-after-free problem inside usb_unlink_urb since 730 * usb_unlink_urb is always racing with .complete 731 * handler(include defer_bh). 732 */ 733 usb_get_urb(urb); 734 spin_unlock_irqrestore(&q->lock, flags); 735 // during some PM-driven resume scenarios, 736 // these (async) unlinks complete immediately 737 retval = usb_unlink_urb (urb); 738 if (retval != -EINPROGRESS && retval != 0) 739 netdev_dbg(dev->net, "unlink urb err, %d\n", retval); 740 else 741 count++; 742 usb_put_urb(urb); 743 spin_lock_irqsave(&q->lock, flags); 744 } 745 spin_unlock_irqrestore (&q->lock, flags); 746 return count; 747 } 748 749 // Flush all pending rx urbs 750 // minidrivers may need to do this when the MTU changes 751 752 void usbnet_unlink_rx_urbs(struct usbnet *dev) 753 { 754 if (netif_running(dev->net)) { 755 (void) unlink_urbs (dev, &dev->rxq); 756 tasklet_schedule(&dev->bh); 757 } 758 } 759 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); 760 761 /*-------------------------------------------------------------------------*/ 762 763 static void wait_skb_queue_empty(struct sk_buff_head *q) 764 { 765 unsigned long flags; 766 767 spin_lock_irqsave(&q->lock, flags); 768 while (!skb_queue_empty(q)) { 769 spin_unlock_irqrestore(&q->lock, flags); 770 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS)); 771 set_current_state(TASK_UNINTERRUPTIBLE); 772 spin_lock_irqsave(&q->lock, flags); 773 } 774 spin_unlock_irqrestore(&q->lock, flags); 775 } 776 777 // precondition: never called in_interrupt 778 static void usbnet_terminate_urbs(struct usbnet *dev) 779 { 780 DECLARE_WAITQUEUE(wait, current); 781 int temp; 782 783 /* ensure there are no more active urbs */ 784 add_wait_queue(&dev->wait, &wait); 785 set_current_state(TASK_UNINTERRUPTIBLE); 786 temp = unlink_urbs(dev, &dev->txq) + 787 unlink_urbs(dev, &dev->rxq); 788 789 /* maybe wait for deletions to finish. */ 790 wait_skb_queue_empty(&dev->rxq); 791 wait_skb_queue_empty(&dev->txq); 792 wait_skb_queue_empty(&dev->done); 793 netif_dbg(dev, ifdown, dev->net, 794 "waited for %d urb completions\n", temp); 795 set_current_state(TASK_RUNNING); 796 remove_wait_queue(&dev->wait, &wait); 797 } 798 799 int usbnet_stop (struct net_device *net) 800 { 801 struct usbnet *dev = netdev_priv(net); 802 struct driver_info *info = dev->driver_info; 803 int retval, pm, mpn; 804 805 clear_bit(EVENT_DEV_OPEN, &dev->flags); 806 netif_stop_queue (net); 807 808 netif_info(dev, ifdown, dev->net, 809 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n", 810 net->stats.rx_packets, net->stats.tx_packets, 811 net->stats.rx_errors, net->stats.tx_errors); 812 813 /* to not race resume */ 814 pm = usb_autopm_get_interface(dev->intf); 815 /* allow minidriver to stop correctly (wireless devices to turn off 816 * radio etc) */ 817 if (info->stop) { 818 retval = info->stop(dev); 819 if (retval < 0) 820 netif_info(dev, ifdown, dev->net, 821 "stop fail (%d) usbnet usb-%s-%s, %s\n", 822 retval, 823 dev->udev->bus->bus_name, dev->udev->devpath, 824 info->description); 825 } 826 827 if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) 828 usbnet_terminate_urbs(dev); 829 830 usbnet_status_stop(dev); 831 832 usbnet_purge_paused_rxq(dev); 833 834 mpn = !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags); 835 836 /* deferred work (task, timer, softirq) must also stop. 837 * can't flush_scheduled_work() until we drop rtnl (later), 838 * else workers could deadlock; so make workers a NOP. 839 */ 840 dev->flags = 0; 841 del_timer_sync (&dev->delay); 842 tasklet_kill (&dev->bh); 843 if (!pm) 844 usb_autopm_put_interface(dev->intf); 845 846 if (info->manage_power && mpn) 847 info->manage_power(dev, 0); 848 else 849 usb_autopm_put_interface(dev->intf); 850 851 return 0; 852 } 853 EXPORT_SYMBOL_GPL(usbnet_stop); 854 855 /*-------------------------------------------------------------------------*/ 856 857 // posts reads, and enables write queuing 858 859 // precondition: never called in_interrupt 860 861 int usbnet_open (struct net_device *net) 862 { 863 struct usbnet *dev = netdev_priv(net); 864 int retval; 865 struct driver_info *info = dev->driver_info; 866 867 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { 868 netif_info(dev, ifup, dev->net, 869 "resumption fail (%d) usbnet usb-%s-%s, %s\n", 870 retval, 871 dev->udev->bus->bus_name, 872 dev->udev->devpath, 873 info->description); 874 goto done_nopm; 875 } 876 877 // put into "known safe" state 878 if (info->reset && (retval = info->reset (dev)) < 0) { 879 netif_info(dev, ifup, dev->net, 880 "open reset fail (%d) usbnet usb-%s-%s, %s\n", 881 retval, 882 dev->udev->bus->bus_name, 883 dev->udev->devpath, 884 info->description); 885 goto done; 886 } 887 888 /* hard_mtu or rx_urb_size may change in reset() */ 889 usbnet_update_max_qlen(dev); 890 891 // insist peer be connected 892 if (info->check_connect && (retval = info->check_connect (dev)) < 0) { 893 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval); 894 goto done; 895 } 896 897 /* start any status interrupt transfer */ 898 if (dev->interrupt) { 899 retval = usbnet_status_start(dev, GFP_KERNEL); 900 if (retval < 0) { 901 netif_err(dev, ifup, dev->net, 902 "intr submit %d\n", retval); 903 goto done; 904 } 905 } 906 907 set_bit(EVENT_DEV_OPEN, &dev->flags); 908 netif_start_queue (net); 909 netif_info(dev, ifup, dev->net, 910 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n", 911 (int)RX_QLEN(dev), (int)TX_QLEN(dev), 912 dev->net->mtu, 913 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" : 914 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" : 915 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" : 916 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" : 917 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" : 918 "simple"); 919 920 /* reset rx error state */ 921 dev->pkt_cnt = 0; 922 dev->pkt_err = 0; 923 clear_bit(EVENT_RX_KILL, &dev->flags); 924 925 // delay posting reads until we're fully open 926 tasklet_schedule (&dev->bh); 927 if (info->manage_power) { 928 retval = info->manage_power(dev, 1); 929 if (retval < 0) { 930 retval = 0; 931 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags); 932 } else { 933 usb_autopm_put_interface(dev->intf); 934 } 935 } 936 return retval; 937 done: 938 usb_autopm_put_interface(dev->intf); 939 done_nopm: 940 return retval; 941 } 942 EXPORT_SYMBOL_GPL(usbnet_open); 943 944 /*-------------------------------------------------------------------------*/ 945 946 /* ethtool methods; minidrivers may need to add some more, but 947 * they'll probably want to use this base set. 948 */ 949 950 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd) 951 { 952 struct usbnet *dev = netdev_priv(net); 953 954 if (!dev->mii.mdio_read) 955 return -EOPNOTSUPP; 956 957 return mii_ethtool_gset(&dev->mii, cmd); 958 } 959 EXPORT_SYMBOL_GPL(usbnet_get_settings); 960 961 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd) 962 { 963 struct usbnet *dev = netdev_priv(net); 964 int retval; 965 966 if (!dev->mii.mdio_write) 967 return -EOPNOTSUPP; 968 969 retval = mii_ethtool_sset(&dev->mii, cmd); 970 971 /* link speed/duplex might have changed */ 972 if (dev->driver_info->link_reset) 973 dev->driver_info->link_reset(dev); 974 975 /* hard_mtu or rx_urb_size may change in link_reset() */ 976 usbnet_update_max_qlen(dev); 977 978 return retval; 979 980 } 981 EXPORT_SYMBOL_GPL(usbnet_set_settings); 982 983 u32 usbnet_get_link (struct net_device *net) 984 { 985 struct usbnet *dev = netdev_priv(net); 986 987 /* If a check_connect is defined, return its result */ 988 if (dev->driver_info->check_connect) 989 return dev->driver_info->check_connect (dev) == 0; 990 991 /* if the device has mii operations, use those */ 992 if (dev->mii.mdio_read) 993 return mii_link_ok(&dev->mii); 994 995 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ 996 return ethtool_op_get_link(net); 997 } 998 EXPORT_SYMBOL_GPL(usbnet_get_link); 999 1000 int usbnet_nway_reset(struct net_device *net) 1001 { 1002 struct usbnet *dev = netdev_priv(net); 1003 1004 if (!dev->mii.mdio_write) 1005 return -EOPNOTSUPP; 1006 1007 return mii_nway_restart(&dev->mii); 1008 } 1009 EXPORT_SYMBOL_GPL(usbnet_nway_reset); 1010 1011 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) 1012 { 1013 struct usbnet *dev = netdev_priv(net); 1014 1015 strlcpy (info->driver, dev->driver_name, sizeof info->driver); 1016 strlcpy (info->version, DRIVER_VERSION, sizeof info->version); 1017 strlcpy (info->fw_version, dev->driver_info->description, 1018 sizeof info->fw_version); 1019 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); 1020 } 1021 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); 1022 1023 u32 usbnet_get_msglevel (struct net_device *net) 1024 { 1025 struct usbnet *dev = netdev_priv(net); 1026 1027 return dev->msg_enable; 1028 } 1029 EXPORT_SYMBOL_GPL(usbnet_get_msglevel); 1030 1031 void usbnet_set_msglevel (struct net_device *net, u32 level) 1032 { 1033 struct usbnet *dev = netdev_priv(net); 1034 1035 dev->msg_enable = level; 1036 } 1037 EXPORT_SYMBOL_GPL(usbnet_set_msglevel); 1038 1039 /* drivers may override default ethtool_ops in their bind() routine */ 1040 static const struct ethtool_ops usbnet_ethtool_ops = { 1041 .get_settings = usbnet_get_settings, 1042 .set_settings = usbnet_set_settings, 1043 .get_link = usbnet_get_link, 1044 .nway_reset = usbnet_nway_reset, 1045 .get_drvinfo = usbnet_get_drvinfo, 1046 .get_msglevel = usbnet_get_msglevel, 1047 .set_msglevel = usbnet_set_msglevel, 1048 .get_ts_info = ethtool_op_get_ts_info, 1049 }; 1050 1051 /*-------------------------------------------------------------------------*/ 1052 1053 static void __handle_link_change(struct usbnet *dev) 1054 { 1055 if (!test_bit(EVENT_DEV_OPEN, &dev->flags)) 1056 return; 1057 1058 if (!netif_carrier_ok(dev->net)) { 1059 /* kill URBs for reading packets to save bus bandwidth */ 1060 unlink_urbs(dev, &dev->rxq); 1061 1062 /* 1063 * tx_timeout will unlink URBs for sending packets and 1064 * tx queue is stopped by netcore after link becomes off 1065 */ 1066 } else { 1067 /* submitting URBs for reading packets */ 1068 tasklet_schedule(&dev->bh); 1069 } 1070 1071 /* hard_mtu or rx_urb_size may change during link change */ 1072 usbnet_update_max_qlen(dev); 1073 1074 clear_bit(EVENT_LINK_CHANGE, &dev->flags); 1075 } 1076 1077 static void usbnet_set_rx_mode(struct net_device *net) 1078 { 1079 struct usbnet *dev = netdev_priv(net); 1080 1081 usbnet_defer_kevent(dev, EVENT_SET_RX_MODE); 1082 } 1083 1084 static void __handle_set_rx_mode(struct usbnet *dev) 1085 { 1086 if (dev->driver_info->set_rx_mode) 1087 (dev->driver_info->set_rx_mode)(dev); 1088 1089 clear_bit(EVENT_SET_RX_MODE, &dev->flags); 1090 } 1091 1092 /* work that cannot be done in interrupt context uses keventd. 1093 * 1094 * NOTE: with 2.5 we could do more of this using completion callbacks, 1095 * especially now that control transfers can be queued. 1096 */ 1097 static void 1098 usbnet_deferred_kevent (struct work_struct *work) 1099 { 1100 struct usbnet *dev = 1101 container_of(work, struct usbnet, kevent); 1102 int status; 1103 1104 /* usb_clear_halt() needs a thread context */ 1105 if (test_bit (EVENT_TX_HALT, &dev->flags)) { 1106 unlink_urbs (dev, &dev->txq); 1107 status = usb_autopm_get_interface(dev->intf); 1108 if (status < 0) 1109 goto fail_pipe; 1110 status = usb_clear_halt (dev->udev, dev->out); 1111 usb_autopm_put_interface(dev->intf); 1112 if (status < 0 && 1113 status != -EPIPE && 1114 status != -ESHUTDOWN) { 1115 if (netif_msg_tx_err (dev)) 1116 fail_pipe: 1117 netdev_err(dev->net, "can't clear tx halt, status %d\n", 1118 status); 1119 } else { 1120 clear_bit (EVENT_TX_HALT, &dev->flags); 1121 if (status != -ESHUTDOWN) 1122 netif_wake_queue (dev->net); 1123 } 1124 } 1125 if (test_bit (EVENT_RX_HALT, &dev->flags)) { 1126 unlink_urbs (dev, &dev->rxq); 1127 status = usb_autopm_get_interface(dev->intf); 1128 if (status < 0) 1129 goto fail_halt; 1130 status = usb_clear_halt (dev->udev, dev->in); 1131 usb_autopm_put_interface(dev->intf); 1132 if (status < 0 && 1133 status != -EPIPE && 1134 status != -ESHUTDOWN) { 1135 if (netif_msg_rx_err (dev)) 1136 fail_halt: 1137 netdev_err(dev->net, "can't clear rx halt, status %d\n", 1138 status); 1139 } else { 1140 clear_bit (EVENT_RX_HALT, &dev->flags); 1141 tasklet_schedule (&dev->bh); 1142 } 1143 } 1144 1145 /* tasklet could resubmit itself forever if memory is tight */ 1146 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { 1147 struct urb *urb = NULL; 1148 int resched = 1; 1149 1150 if (netif_running (dev->net)) 1151 urb = usb_alloc_urb (0, GFP_KERNEL); 1152 else 1153 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1154 if (urb != NULL) { 1155 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1156 status = usb_autopm_get_interface(dev->intf); 1157 if (status < 0) { 1158 usb_free_urb(urb); 1159 goto fail_lowmem; 1160 } 1161 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) 1162 resched = 0; 1163 usb_autopm_put_interface(dev->intf); 1164 fail_lowmem: 1165 if (resched) 1166 tasklet_schedule (&dev->bh); 1167 } 1168 } 1169 1170 if (test_bit (EVENT_LINK_RESET, &dev->flags)) { 1171 struct driver_info *info = dev->driver_info; 1172 int retval = 0; 1173 1174 clear_bit (EVENT_LINK_RESET, &dev->flags); 1175 status = usb_autopm_get_interface(dev->intf); 1176 if (status < 0) 1177 goto skip_reset; 1178 if(info->link_reset && (retval = info->link_reset(dev)) < 0) { 1179 usb_autopm_put_interface(dev->intf); 1180 skip_reset: 1181 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", 1182 retval, 1183 dev->udev->bus->bus_name, 1184 dev->udev->devpath, 1185 info->description); 1186 } else { 1187 usb_autopm_put_interface(dev->intf); 1188 } 1189 1190 /* handle link change from link resetting */ 1191 __handle_link_change(dev); 1192 } 1193 1194 if (test_bit (EVENT_LINK_CHANGE, &dev->flags)) 1195 __handle_link_change(dev); 1196 1197 if (test_bit (EVENT_SET_RX_MODE, &dev->flags)) 1198 __handle_set_rx_mode(dev); 1199 1200 1201 if (dev->flags) 1202 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); 1203 } 1204 1205 /*-------------------------------------------------------------------------*/ 1206 1207 static void tx_complete (struct urb *urb) 1208 { 1209 struct sk_buff *skb = (struct sk_buff *) urb->context; 1210 struct skb_data *entry = (struct skb_data *) skb->cb; 1211 struct usbnet *dev = entry->dev; 1212 1213 if (urb->status == 0) { 1214 dev->net->stats.tx_packets += entry->packets; 1215 dev->net->stats.tx_bytes += entry->length; 1216 } else { 1217 dev->net->stats.tx_errors++; 1218 1219 switch (urb->status) { 1220 case -EPIPE: 1221 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1222 break; 1223 1224 /* software-driven interface shutdown */ 1225 case -ECONNRESET: // async unlink 1226 case -ESHUTDOWN: // hardware gone 1227 break; 1228 1229 /* like rx, tx gets controller i/o faults during hub_wq 1230 * delays and so it uses the same throttling mechanism. 1231 */ 1232 case -EPROTO: 1233 case -ETIME: 1234 case -EILSEQ: 1235 usb_mark_last_busy(dev->udev); 1236 if (!timer_pending (&dev->delay)) { 1237 mod_timer (&dev->delay, 1238 jiffies + THROTTLE_JIFFIES); 1239 netif_dbg(dev, link, dev->net, 1240 "tx throttle %d\n", urb->status); 1241 } 1242 netif_stop_queue (dev->net); 1243 break; 1244 default: 1245 netif_dbg(dev, tx_err, dev->net, 1246 "tx err %d\n", entry->urb->status); 1247 break; 1248 } 1249 } 1250 1251 usb_autopm_put_interface_async(dev->intf); 1252 (void) defer_bh(dev, skb, &dev->txq, tx_done); 1253 } 1254 1255 /*-------------------------------------------------------------------------*/ 1256 1257 void usbnet_tx_timeout (struct net_device *net) 1258 { 1259 struct usbnet *dev = netdev_priv(net); 1260 1261 unlink_urbs (dev, &dev->txq); 1262 tasklet_schedule (&dev->bh); 1263 /* this needs to be handled individually because the generic layer 1264 * doesn't know what is sufficient and could not restore private 1265 * information if a remedy of an unconditional reset were used. 1266 */ 1267 if (dev->driver_info->recover) 1268 (dev->driver_info->recover)(dev); 1269 } 1270 EXPORT_SYMBOL_GPL(usbnet_tx_timeout); 1271 1272 /*-------------------------------------------------------------------------*/ 1273 1274 static int build_dma_sg(const struct sk_buff *skb, struct urb *urb) 1275 { 1276 unsigned num_sgs, total_len = 0; 1277 int i, s = 0; 1278 1279 num_sgs = skb_shinfo(skb)->nr_frags + 1; 1280 if (num_sgs == 1) 1281 return 0; 1282 1283 /* reserve one for zero packet */ 1284 urb->sg = kmalloc((num_sgs + 1) * sizeof(struct scatterlist), 1285 GFP_ATOMIC); 1286 if (!urb->sg) 1287 return -ENOMEM; 1288 1289 urb->num_sgs = num_sgs; 1290 sg_init_table(urb->sg, urb->num_sgs + 1); 1291 1292 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb)); 1293 total_len += skb_headlen(skb); 1294 1295 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1296 struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i]; 1297 1298 total_len += skb_frag_size(f); 1299 sg_set_page(&urb->sg[i + s], f->page.p, f->size, 1300 f->page_offset); 1301 } 1302 urb->transfer_buffer_length = total_len; 1303 1304 return 1; 1305 } 1306 1307 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, 1308 struct net_device *net) 1309 { 1310 struct usbnet *dev = netdev_priv(net); 1311 unsigned int length; 1312 struct urb *urb = NULL; 1313 struct skb_data *entry; 1314 struct driver_info *info = dev->driver_info; 1315 unsigned long flags; 1316 int retval; 1317 1318 if (skb) 1319 skb_tx_timestamp(skb); 1320 1321 // some devices want funky USB-level framing, for 1322 // win32 driver (usually) and/or hardware quirks 1323 if (info->tx_fixup) { 1324 skb = info->tx_fixup (dev, skb, GFP_ATOMIC); 1325 if (!skb) { 1326 /* packet collected; minidriver waiting for more */ 1327 if (info->flags & FLAG_MULTI_PACKET) 1328 goto not_drop; 1329 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); 1330 goto drop; 1331 } 1332 } 1333 1334 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { 1335 netif_dbg(dev, tx_err, dev->net, "no urb\n"); 1336 goto drop; 1337 } 1338 1339 entry = (struct skb_data *) skb->cb; 1340 entry->urb = urb; 1341 entry->dev = dev; 1342 1343 usb_fill_bulk_urb (urb, dev->udev, dev->out, 1344 skb->data, skb->len, tx_complete, skb); 1345 if (dev->can_dma_sg) { 1346 if (build_dma_sg(skb, urb) < 0) 1347 goto drop; 1348 } 1349 length = urb->transfer_buffer_length; 1350 1351 /* don't assume the hardware handles USB_ZERO_PACKET 1352 * NOTE: strictly conforming cdc-ether devices should expect 1353 * the ZLP here, but ignore the one-byte packet. 1354 * NOTE2: CDC NCM specification is different from CDC ECM when 1355 * handling ZLP/short packets, so cdc_ncm driver will make short 1356 * packet itself if needed. 1357 */ 1358 if (length % dev->maxpacket == 0) { 1359 if (!(info->flags & FLAG_SEND_ZLP)) { 1360 if (!(info->flags & FLAG_MULTI_PACKET)) { 1361 length++; 1362 if (skb_tailroom(skb) && !urb->num_sgs) { 1363 skb->data[skb->len] = 0; 1364 __skb_put(skb, 1); 1365 } else if (urb->num_sgs) 1366 sg_set_buf(&urb->sg[urb->num_sgs++], 1367 dev->padding_pkt, 1); 1368 } 1369 } else 1370 urb->transfer_flags |= URB_ZERO_PACKET; 1371 } 1372 urb->transfer_buffer_length = length; 1373 1374 if (info->flags & FLAG_MULTI_PACKET) { 1375 /* Driver has set number of packets and a length delta. 1376 * Calculate the complete length and ensure that it's 1377 * positive. 1378 */ 1379 entry->length += length; 1380 if (WARN_ON_ONCE(entry->length <= 0)) 1381 entry->length = length; 1382 } else { 1383 usbnet_set_skb_tx_stats(skb, 1, length); 1384 } 1385 1386 spin_lock_irqsave(&dev->txq.lock, flags); 1387 retval = usb_autopm_get_interface_async(dev->intf); 1388 if (retval < 0) { 1389 spin_unlock_irqrestore(&dev->txq.lock, flags); 1390 goto drop; 1391 } 1392 1393 #ifdef CONFIG_PM 1394 /* if this triggers the device is still a sleep */ 1395 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { 1396 /* transmission will be done in resume */ 1397 usb_anchor_urb(urb, &dev->deferred); 1398 /* no use to process more packets */ 1399 netif_stop_queue(net); 1400 usb_put_urb(urb); 1401 spin_unlock_irqrestore(&dev->txq.lock, flags); 1402 netdev_dbg(dev->net, "Delaying transmission for resumption\n"); 1403 goto deferred; 1404 } 1405 #endif 1406 1407 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { 1408 case -EPIPE: 1409 netif_stop_queue (net); 1410 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1411 usb_autopm_put_interface_async(dev->intf); 1412 break; 1413 default: 1414 usb_autopm_put_interface_async(dev->intf); 1415 netif_dbg(dev, tx_err, dev->net, 1416 "tx: submit urb err %d\n", retval); 1417 break; 1418 case 0: 1419 netif_trans_update(net); 1420 __usbnet_queue_skb(&dev->txq, skb, tx_start); 1421 if (dev->txq.qlen >= TX_QLEN (dev)) 1422 netif_stop_queue (net); 1423 } 1424 spin_unlock_irqrestore (&dev->txq.lock, flags); 1425 1426 if (retval) { 1427 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); 1428 drop: 1429 dev->net->stats.tx_dropped++; 1430 not_drop: 1431 if (skb) 1432 dev_kfree_skb_any (skb); 1433 if (urb) { 1434 kfree(urb->sg); 1435 usb_free_urb(urb); 1436 } 1437 } else 1438 netif_dbg(dev, tx_queued, dev->net, 1439 "> tx, len %u, type 0x%x\n", length, skb->protocol); 1440 #ifdef CONFIG_PM 1441 deferred: 1442 #endif 1443 return NETDEV_TX_OK; 1444 } 1445 EXPORT_SYMBOL_GPL(usbnet_start_xmit); 1446 1447 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags) 1448 { 1449 struct urb *urb; 1450 int i; 1451 int ret = 0; 1452 1453 /* don't refill the queue all at once */ 1454 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) { 1455 urb = usb_alloc_urb(0, flags); 1456 if (urb != NULL) { 1457 ret = rx_submit(dev, urb, flags); 1458 if (ret) 1459 goto err; 1460 } else { 1461 ret = -ENOMEM; 1462 goto err; 1463 } 1464 } 1465 err: 1466 return ret; 1467 } 1468 1469 /*-------------------------------------------------------------------------*/ 1470 1471 // tasklet (work deferred from completions, in_irq) or timer 1472 1473 static void usbnet_bh (unsigned long param) 1474 { 1475 struct usbnet *dev = (struct usbnet *) param; 1476 struct sk_buff *skb; 1477 struct skb_data *entry; 1478 1479 while ((skb = skb_dequeue (&dev->done))) { 1480 entry = (struct skb_data *) skb->cb; 1481 switch (entry->state) { 1482 case rx_done: 1483 entry->state = rx_cleanup; 1484 rx_process (dev, skb); 1485 continue; 1486 case tx_done: 1487 kfree(entry->urb->sg); 1488 case rx_cleanup: 1489 usb_free_urb (entry->urb); 1490 dev_kfree_skb (skb); 1491 continue; 1492 default: 1493 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); 1494 } 1495 } 1496 1497 /* restart RX again after disabling due to high error rate */ 1498 clear_bit(EVENT_RX_KILL, &dev->flags); 1499 1500 /* waiting for all pending urbs to complete? 1501 * only then can we forgo submitting anew 1502 */ 1503 if (waitqueue_active(&dev->wait)) { 1504 if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0) 1505 wake_up_all(&dev->wait); 1506 1507 // or are we maybe short a few urbs? 1508 } else if (netif_running (dev->net) && 1509 netif_device_present (dev->net) && 1510 netif_carrier_ok(dev->net) && 1511 !timer_pending (&dev->delay) && 1512 !test_bit (EVENT_RX_HALT, &dev->flags)) { 1513 int temp = dev->rxq.qlen; 1514 1515 if (temp < RX_QLEN(dev)) { 1516 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK) 1517 return; 1518 if (temp != dev->rxq.qlen) 1519 netif_dbg(dev, link, dev->net, 1520 "rxqlen %d --> %d\n", 1521 temp, dev->rxq.qlen); 1522 if (dev->rxq.qlen < RX_QLEN(dev)) 1523 tasklet_schedule (&dev->bh); 1524 } 1525 if (dev->txq.qlen < TX_QLEN (dev)) 1526 netif_wake_queue (dev->net); 1527 } 1528 } 1529 1530 1531 /*------------------------------------------------------------------------- 1532 * 1533 * USB Device Driver support 1534 * 1535 *-------------------------------------------------------------------------*/ 1536 1537 // precondition: never called in_interrupt 1538 1539 void usbnet_disconnect (struct usb_interface *intf) 1540 { 1541 struct usbnet *dev; 1542 struct usb_device *xdev; 1543 struct net_device *net; 1544 1545 dev = usb_get_intfdata(intf); 1546 usb_set_intfdata(intf, NULL); 1547 if (!dev) 1548 return; 1549 1550 xdev = interface_to_usbdev (intf); 1551 1552 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", 1553 intf->dev.driver->name, 1554 xdev->bus->bus_name, xdev->devpath, 1555 dev->driver_info->description); 1556 1557 net = dev->net; 1558 unregister_netdev (net); 1559 1560 cancel_work_sync(&dev->kevent); 1561 1562 usb_scuttle_anchored_urbs(&dev->deferred); 1563 1564 if (dev->driver_info->unbind) 1565 dev->driver_info->unbind (dev, intf); 1566 1567 usb_kill_urb(dev->interrupt); 1568 usb_free_urb(dev->interrupt); 1569 kfree(dev->padding_pkt); 1570 1571 free_netdev(net); 1572 } 1573 EXPORT_SYMBOL_GPL(usbnet_disconnect); 1574 1575 static const struct net_device_ops usbnet_netdev_ops = { 1576 .ndo_open = usbnet_open, 1577 .ndo_stop = usbnet_stop, 1578 .ndo_start_xmit = usbnet_start_xmit, 1579 .ndo_tx_timeout = usbnet_tx_timeout, 1580 .ndo_set_rx_mode = usbnet_set_rx_mode, 1581 .ndo_change_mtu = usbnet_change_mtu, 1582 .ndo_set_mac_address = eth_mac_addr, 1583 .ndo_validate_addr = eth_validate_addr, 1584 }; 1585 1586 /*-------------------------------------------------------------------------*/ 1587 1588 // precondition: never called in_interrupt 1589 1590 static struct device_type wlan_type = { 1591 .name = "wlan", 1592 }; 1593 1594 static struct device_type wwan_type = { 1595 .name = "wwan", 1596 }; 1597 1598 int 1599 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) 1600 { 1601 struct usbnet *dev; 1602 struct net_device *net; 1603 struct usb_host_interface *interface; 1604 struct driver_info *info; 1605 struct usb_device *xdev; 1606 int status; 1607 const char *name; 1608 struct usb_driver *driver = to_usb_driver(udev->dev.driver); 1609 1610 /* usbnet already took usb runtime pm, so have to enable the feature 1611 * for usb interface, otherwise usb_autopm_get_interface may return 1612 * failure if RUNTIME_PM is enabled. 1613 */ 1614 if (!driver->supports_autosuspend) { 1615 driver->supports_autosuspend = 1; 1616 pm_runtime_enable(&udev->dev); 1617 } 1618 1619 name = udev->dev.driver->name; 1620 info = (struct driver_info *) prod->driver_info; 1621 if (!info) { 1622 dev_dbg (&udev->dev, "blacklisted by %s\n", name); 1623 return -ENODEV; 1624 } 1625 xdev = interface_to_usbdev (udev); 1626 interface = udev->cur_altsetting; 1627 1628 status = -ENOMEM; 1629 1630 // set up our own records 1631 net = alloc_etherdev(sizeof(*dev)); 1632 if (!net) 1633 goto out; 1634 1635 /* netdev_printk() needs this so do it as early as possible */ 1636 SET_NETDEV_DEV(net, &udev->dev); 1637 1638 dev = netdev_priv(net); 1639 dev->udev = xdev; 1640 dev->intf = udev; 1641 dev->driver_info = info; 1642 dev->driver_name = name; 1643 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV 1644 | NETIF_MSG_PROBE | NETIF_MSG_LINK); 1645 init_waitqueue_head(&dev->wait); 1646 skb_queue_head_init (&dev->rxq); 1647 skb_queue_head_init (&dev->txq); 1648 skb_queue_head_init (&dev->done); 1649 skb_queue_head_init(&dev->rxq_pause); 1650 dev->bh.func = usbnet_bh; 1651 dev->bh.data = (unsigned long) dev; 1652 INIT_WORK (&dev->kevent, usbnet_deferred_kevent); 1653 init_usb_anchor(&dev->deferred); 1654 dev->delay.function = usbnet_bh; 1655 dev->delay.data = (unsigned long) dev; 1656 init_timer (&dev->delay); 1657 mutex_init (&dev->phy_mutex); 1658 mutex_init(&dev->interrupt_mutex); 1659 dev->interrupt_count = 0; 1660 1661 dev->net = net; 1662 strcpy (net->name, "usb%d"); 1663 memcpy (net->dev_addr, node_id, sizeof node_id); 1664 1665 /* rx and tx sides can use different message sizes; 1666 * bind() should set rx_urb_size in that case. 1667 */ 1668 dev->hard_mtu = net->mtu + net->hard_header_len; 1669 1670 net->netdev_ops = &usbnet_netdev_ops; 1671 net->watchdog_timeo = TX_TIMEOUT_JIFFIES; 1672 net->ethtool_ops = &usbnet_ethtool_ops; 1673 1674 // allow device-specific bind/init procedures 1675 // NOTE net->name still not usable ... 1676 if (info->bind) { 1677 status = info->bind (dev, udev); 1678 if (status < 0) 1679 goto out1; 1680 1681 // heuristic: "usb%d" for links we know are two-host, 1682 // else "eth%d" when there's reasonable doubt. userspace 1683 // can rename the link if it knows better. 1684 if ((dev->driver_info->flags & FLAG_ETHER) != 0 && 1685 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 || 1686 (net->dev_addr [0] & 0x02) == 0)) 1687 strcpy (net->name, "eth%d"); 1688 /* WLAN devices should always be named "wlan%d" */ 1689 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1690 strcpy(net->name, "wlan%d"); 1691 /* WWAN devices should always be named "wwan%d" */ 1692 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1693 strcpy(net->name, "wwan%d"); 1694 1695 /* devices that cannot do ARP */ 1696 if ((dev->driver_info->flags & FLAG_NOARP) != 0) 1697 net->flags |= IFF_NOARP; 1698 1699 /* maybe the remote can't receive an Ethernet MTU */ 1700 if (net->mtu > (dev->hard_mtu - net->hard_header_len)) 1701 net->mtu = dev->hard_mtu - net->hard_header_len; 1702 } else if (!info->in || !info->out) 1703 status = usbnet_get_endpoints (dev, udev); 1704 else { 1705 dev->in = usb_rcvbulkpipe (xdev, info->in); 1706 dev->out = usb_sndbulkpipe (xdev, info->out); 1707 if (!(info->flags & FLAG_NO_SETINT)) 1708 status = usb_set_interface (xdev, 1709 interface->desc.bInterfaceNumber, 1710 interface->desc.bAlternateSetting); 1711 else 1712 status = 0; 1713 1714 } 1715 if (status >= 0 && dev->status) 1716 status = init_status (dev, udev); 1717 if (status < 0) 1718 goto out3; 1719 1720 if (!dev->rx_urb_size) 1721 dev->rx_urb_size = dev->hard_mtu; 1722 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); 1723 1724 /* let userspace know we have a random address */ 1725 if (ether_addr_equal(net->dev_addr, node_id)) 1726 net->addr_assign_type = NET_ADDR_RANDOM; 1727 1728 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1729 SET_NETDEV_DEVTYPE(net, &wlan_type); 1730 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1731 SET_NETDEV_DEVTYPE(net, &wwan_type); 1732 1733 /* initialize max rx_qlen and tx_qlen */ 1734 usbnet_update_max_qlen(dev); 1735 1736 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) && 1737 !(info->flags & FLAG_MULTI_PACKET)) { 1738 dev->padding_pkt = kzalloc(1, GFP_KERNEL); 1739 if (!dev->padding_pkt) { 1740 status = -ENOMEM; 1741 goto out4; 1742 } 1743 } 1744 1745 status = register_netdev (net); 1746 if (status) 1747 goto out5; 1748 netif_info(dev, probe, dev->net, 1749 "register '%s' at usb-%s-%s, %s, %pM\n", 1750 udev->dev.driver->name, 1751 xdev->bus->bus_name, xdev->devpath, 1752 dev->driver_info->description, 1753 net->dev_addr); 1754 1755 // ok, it's ready to go. 1756 usb_set_intfdata (udev, dev); 1757 1758 netif_device_attach (net); 1759 1760 if (dev->driver_info->flags & FLAG_LINK_INTR) 1761 usbnet_link_change(dev, 0, 0); 1762 1763 return 0; 1764 1765 out5: 1766 kfree(dev->padding_pkt); 1767 out4: 1768 usb_free_urb(dev->interrupt); 1769 out3: 1770 if (info->unbind) 1771 info->unbind (dev, udev); 1772 out1: 1773 /* subdrivers must undo all they did in bind() if they 1774 * fail it, but we may fail later and a deferred kevent 1775 * may trigger an error resubmitting itself and, worse, 1776 * schedule a timer. So we kill it all just in case. 1777 */ 1778 cancel_work_sync(&dev->kevent); 1779 del_timer_sync(&dev->delay); 1780 free_netdev(net); 1781 out: 1782 return status; 1783 } 1784 EXPORT_SYMBOL_GPL(usbnet_probe); 1785 1786 /*-------------------------------------------------------------------------*/ 1787 1788 /* 1789 * suspend the whole driver as soon as the first interface is suspended 1790 * resume only when the last interface is resumed 1791 */ 1792 1793 int usbnet_suspend (struct usb_interface *intf, pm_message_t message) 1794 { 1795 struct usbnet *dev = usb_get_intfdata(intf); 1796 1797 if (!dev->suspend_count++) { 1798 spin_lock_irq(&dev->txq.lock); 1799 /* don't autosuspend while transmitting */ 1800 if (dev->txq.qlen && PMSG_IS_AUTO(message)) { 1801 dev->suspend_count--; 1802 spin_unlock_irq(&dev->txq.lock); 1803 return -EBUSY; 1804 } else { 1805 set_bit(EVENT_DEV_ASLEEP, &dev->flags); 1806 spin_unlock_irq(&dev->txq.lock); 1807 } 1808 /* 1809 * accelerate emptying of the rx and queues, to avoid 1810 * having everything error out. 1811 */ 1812 netif_device_detach (dev->net); 1813 usbnet_terminate_urbs(dev); 1814 __usbnet_status_stop_force(dev); 1815 1816 /* 1817 * reattach so runtime management can use and 1818 * wake the device 1819 */ 1820 netif_device_attach (dev->net); 1821 } 1822 return 0; 1823 } 1824 EXPORT_SYMBOL_GPL(usbnet_suspend); 1825 1826 int usbnet_resume (struct usb_interface *intf) 1827 { 1828 struct usbnet *dev = usb_get_intfdata(intf); 1829 struct sk_buff *skb; 1830 struct urb *res; 1831 int retval; 1832 1833 if (!--dev->suspend_count) { 1834 /* resume interrupt URB if it was previously submitted */ 1835 __usbnet_status_start_force(dev, GFP_NOIO); 1836 1837 spin_lock_irq(&dev->txq.lock); 1838 while ((res = usb_get_from_anchor(&dev->deferred))) { 1839 1840 skb = (struct sk_buff *)res->context; 1841 retval = usb_submit_urb(res, GFP_ATOMIC); 1842 if (retval < 0) { 1843 dev_kfree_skb_any(skb); 1844 kfree(res->sg); 1845 usb_free_urb(res); 1846 usb_autopm_put_interface_async(dev->intf); 1847 } else { 1848 netif_trans_update(dev->net); 1849 __skb_queue_tail(&dev->txq, skb); 1850 } 1851 } 1852 1853 smp_mb(); 1854 clear_bit(EVENT_DEV_ASLEEP, &dev->flags); 1855 spin_unlock_irq(&dev->txq.lock); 1856 1857 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) { 1858 /* handle remote wakeup ASAP 1859 * we cannot race against stop 1860 */ 1861 if (netif_device_present(dev->net) && 1862 !timer_pending(&dev->delay) && 1863 !test_bit(EVENT_RX_HALT, &dev->flags)) 1864 rx_alloc_submit(dev, GFP_NOIO); 1865 1866 if (!(dev->txq.qlen >= TX_QLEN(dev))) 1867 netif_tx_wake_all_queues(dev->net); 1868 tasklet_schedule (&dev->bh); 1869 } 1870 } 1871 1872 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) 1873 usb_autopm_get_interface_no_resume(intf); 1874 1875 return 0; 1876 } 1877 EXPORT_SYMBOL_GPL(usbnet_resume); 1878 1879 /* 1880 * Either a subdriver implements manage_power, then it is assumed to always 1881 * be ready to be suspended or it reports the readiness to be suspended 1882 * explicitly 1883 */ 1884 void usbnet_device_suggests_idle(struct usbnet *dev) 1885 { 1886 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) { 1887 dev->intf->needs_remote_wakeup = 1; 1888 usb_autopm_put_interface_async(dev->intf); 1889 } 1890 } 1891 EXPORT_SYMBOL(usbnet_device_suggests_idle); 1892 1893 /* 1894 * For devices that can do without special commands 1895 */ 1896 int usbnet_manage_power(struct usbnet *dev, int on) 1897 { 1898 dev->intf->needs_remote_wakeup = on; 1899 return 0; 1900 } 1901 EXPORT_SYMBOL(usbnet_manage_power); 1902 1903 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset) 1904 { 1905 /* update link after link is reseted */ 1906 if (link && !need_reset) 1907 netif_carrier_on(dev->net); 1908 else 1909 netif_carrier_off(dev->net); 1910 1911 if (need_reset && link) 1912 usbnet_defer_kevent(dev, EVENT_LINK_RESET); 1913 else 1914 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE); 1915 } 1916 EXPORT_SYMBOL(usbnet_link_change); 1917 1918 /*-------------------------------------------------------------------------*/ 1919 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1920 u16 value, u16 index, void *data, u16 size) 1921 { 1922 void *buf = NULL; 1923 int err = -ENOMEM; 1924 1925 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x" 1926 " value=0x%04x index=0x%04x size=%d\n", 1927 cmd, reqtype, value, index, size); 1928 1929 if (data) { 1930 buf = kmalloc(size, GFP_KERNEL); 1931 if (!buf) 1932 goto out; 1933 } 1934 1935 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), 1936 cmd, reqtype, value, index, buf, size, 1937 USB_CTRL_GET_TIMEOUT); 1938 if (err > 0 && err <= size) 1939 memcpy(data, buf, err); 1940 kfree(buf); 1941 out: 1942 return err; 1943 } 1944 1945 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1946 u16 value, u16 index, const void *data, 1947 u16 size) 1948 { 1949 void *buf = NULL; 1950 int err = -ENOMEM; 1951 1952 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 1953 " value=0x%04x index=0x%04x size=%d\n", 1954 cmd, reqtype, value, index, size); 1955 1956 if (data) { 1957 buf = kmemdup(data, size, GFP_KERNEL); 1958 if (!buf) 1959 goto out; 1960 } 1961 1962 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), 1963 cmd, reqtype, value, index, buf, size, 1964 USB_CTRL_SET_TIMEOUT); 1965 kfree(buf); 1966 1967 out: 1968 return err; 1969 } 1970 1971 int cdc_parse_cdc_header(struct usb_cdc_parsed_header *hdr, 1972 struct usb_interface *intf, 1973 u8 *buffer, 1974 int buflen) 1975 { 1976 /* duplicates are ignored */ 1977 struct usb_cdc_union_desc *union_header = NULL; 1978 1979 /* duplicates are not tolerated */ 1980 struct usb_cdc_header_desc *header = NULL; 1981 struct usb_cdc_ether_desc *ether = NULL; 1982 struct usb_cdc_mdlm_detail_desc *detail = NULL; 1983 struct usb_cdc_mdlm_desc *desc = NULL; 1984 1985 unsigned int elength; 1986 int cnt = 0; 1987 1988 memset(hdr, 0x00, sizeof(struct usb_cdc_parsed_header)); 1989 hdr->phonet_magic_present = false; 1990 while (buflen > 0) { 1991 elength = buffer[0]; 1992 if (!elength) { 1993 dev_err(&intf->dev, "skipping garbage byte\n"); 1994 elength = 1; 1995 goto next_desc; 1996 } 1997 if (buffer[1] != USB_DT_CS_INTERFACE) { 1998 dev_err(&intf->dev, "skipping garbage\n"); 1999 goto next_desc; 2000 } 2001 2002 switch (buffer[2]) { 2003 case USB_CDC_UNION_TYPE: /* we've found it */ 2004 if (elength < sizeof(struct usb_cdc_union_desc)) 2005 goto next_desc; 2006 if (union_header) { 2007 dev_err(&intf->dev, "More than one union descriptor, skipping ...\n"); 2008 goto next_desc; 2009 } 2010 union_header = (struct usb_cdc_union_desc *)buffer; 2011 break; 2012 case USB_CDC_COUNTRY_TYPE: 2013 if (elength < sizeof(struct usb_cdc_country_functional_desc)) 2014 goto next_desc; 2015 hdr->usb_cdc_country_functional_desc = 2016 (struct usb_cdc_country_functional_desc *)buffer; 2017 break; 2018 case USB_CDC_HEADER_TYPE: 2019 if (elength != sizeof(struct usb_cdc_header_desc)) 2020 goto next_desc; 2021 if (header) 2022 return -EINVAL; 2023 header = (struct usb_cdc_header_desc *)buffer; 2024 break; 2025 case USB_CDC_ACM_TYPE: 2026 if (elength < sizeof(struct usb_cdc_acm_descriptor)) 2027 goto next_desc; 2028 hdr->usb_cdc_acm_descriptor = 2029 (struct usb_cdc_acm_descriptor *)buffer; 2030 break; 2031 case USB_CDC_ETHERNET_TYPE: 2032 if (elength != sizeof(struct usb_cdc_ether_desc)) 2033 goto next_desc; 2034 if (ether) 2035 return -EINVAL; 2036 ether = (struct usb_cdc_ether_desc *)buffer; 2037 break; 2038 case USB_CDC_CALL_MANAGEMENT_TYPE: 2039 if (elength < sizeof(struct usb_cdc_call_mgmt_descriptor)) 2040 goto next_desc; 2041 hdr->usb_cdc_call_mgmt_descriptor = 2042 (struct usb_cdc_call_mgmt_descriptor *)buffer; 2043 break; 2044 case USB_CDC_DMM_TYPE: 2045 if (elength < sizeof(struct usb_cdc_dmm_desc)) 2046 goto next_desc; 2047 hdr->usb_cdc_dmm_desc = 2048 (struct usb_cdc_dmm_desc *)buffer; 2049 break; 2050 case USB_CDC_MDLM_TYPE: 2051 if (elength < sizeof(struct usb_cdc_mdlm_desc *)) 2052 goto next_desc; 2053 if (desc) 2054 return -EINVAL; 2055 desc = (struct usb_cdc_mdlm_desc *)buffer; 2056 break; 2057 case USB_CDC_MDLM_DETAIL_TYPE: 2058 if (elength < sizeof(struct usb_cdc_mdlm_detail_desc *)) 2059 goto next_desc; 2060 if (detail) 2061 return -EINVAL; 2062 detail = (struct usb_cdc_mdlm_detail_desc *)buffer; 2063 break; 2064 case USB_CDC_NCM_TYPE: 2065 if (elength < sizeof(struct usb_cdc_ncm_desc)) 2066 goto next_desc; 2067 hdr->usb_cdc_ncm_desc = (struct usb_cdc_ncm_desc *)buffer; 2068 break; 2069 case USB_CDC_MBIM_TYPE: 2070 if (elength < sizeof(struct usb_cdc_mbim_desc)) 2071 goto next_desc; 2072 2073 hdr->usb_cdc_mbim_desc = (struct usb_cdc_mbim_desc *)buffer; 2074 break; 2075 case USB_CDC_MBIM_EXTENDED_TYPE: 2076 if (elength < sizeof(struct usb_cdc_mbim_extended_desc)) 2077 break; 2078 hdr->usb_cdc_mbim_extended_desc = 2079 (struct usb_cdc_mbim_extended_desc *)buffer; 2080 break; 2081 case CDC_PHONET_MAGIC_NUMBER: 2082 hdr->phonet_magic_present = true; 2083 break; 2084 default: 2085 /* 2086 * there are LOTS more CDC descriptors that 2087 * could legitimately be found here. 2088 */ 2089 dev_dbg(&intf->dev, "Ignoring descriptor: type %02x, length %ud\n", 2090 buffer[2], elength); 2091 goto next_desc; 2092 } 2093 cnt++; 2094 next_desc: 2095 buflen -= elength; 2096 buffer += elength; 2097 } 2098 hdr->usb_cdc_union_desc = union_header; 2099 hdr->usb_cdc_header_desc = header; 2100 hdr->usb_cdc_mdlm_detail_desc = detail; 2101 hdr->usb_cdc_mdlm_desc = desc; 2102 hdr->usb_cdc_ether_desc = ether; 2103 return cnt; 2104 } 2105 2106 EXPORT_SYMBOL(cdc_parse_cdc_header); 2107 2108 /* 2109 * The function can't be called inside suspend/resume callback, 2110 * otherwise deadlock will be caused. 2111 */ 2112 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 2113 u16 value, u16 index, void *data, u16 size) 2114 { 2115 int ret; 2116 2117 if (usb_autopm_get_interface(dev->intf) < 0) 2118 return -ENODEV; 2119 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index, 2120 data, size); 2121 usb_autopm_put_interface(dev->intf); 2122 return ret; 2123 } 2124 EXPORT_SYMBOL_GPL(usbnet_read_cmd); 2125 2126 /* 2127 * The function can't be called inside suspend/resume callback, 2128 * otherwise deadlock will be caused. 2129 */ 2130 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 2131 u16 value, u16 index, const void *data, u16 size) 2132 { 2133 int ret; 2134 2135 if (usb_autopm_get_interface(dev->intf) < 0) 2136 return -ENODEV; 2137 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index, 2138 data, size); 2139 usb_autopm_put_interface(dev->intf); 2140 return ret; 2141 } 2142 EXPORT_SYMBOL_GPL(usbnet_write_cmd); 2143 2144 /* 2145 * The function can be called inside suspend/resume callback safely 2146 * and should only be called by suspend/resume callback generally. 2147 */ 2148 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 2149 u16 value, u16 index, void *data, u16 size) 2150 { 2151 return __usbnet_read_cmd(dev, cmd, reqtype, value, index, 2152 data, size); 2153 } 2154 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm); 2155 2156 /* 2157 * The function can be called inside suspend/resume callback safely 2158 * and should only be called by suspend/resume callback generally. 2159 */ 2160 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 2161 u16 value, u16 index, const void *data, 2162 u16 size) 2163 { 2164 return __usbnet_write_cmd(dev, cmd, reqtype, value, index, 2165 data, size); 2166 } 2167 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm); 2168 2169 static void usbnet_async_cmd_cb(struct urb *urb) 2170 { 2171 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context; 2172 int status = urb->status; 2173 2174 if (status < 0) 2175 dev_dbg(&urb->dev->dev, "%s failed with %d", 2176 __func__, status); 2177 2178 kfree(req); 2179 usb_free_urb(urb); 2180 } 2181 2182 /* 2183 * The caller must make sure that device can't be put into suspend 2184 * state until the control URB completes. 2185 */ 2186 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype, 2187 u16 value, u16 index, const void *data, u16 size) 2188 { 2189 struct usb_ctrlrequest *req = NULL; 2190 struct urb *urb; 2191 int err = -ENOMEM; 2192 void *buf = NULL; 2193 2194 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 2195 " value=0x%04x index=0x%04x size=%d\n", 2196 cmd, reqtype, value, index, size); 2197 2198 urb = usb_alloc_urb(0, GFP_ATOMIC); 2199 if (!urb) { 2200 netdev_err(dev->net, "Error allocating URB in" 2201 " %s!\n", __func__); 2202 goto fail; 2203 } 2204 2205 if (data) { 2206 buf = kmemdup(data, size, GFP_ATOMIC); 2207 if (!buf) { 2208 netdev_err(dev->net, "Error allocating buffer" 2209 " in %s!\n", __func__); 2210 goto fail_free; 2211 } 2212 } 2213 2214 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC); 2215 if (!req) 2216 goto fail_free_buf; 2217 2218 req->bRequestType = reqtype; 2219 req->bRequest = cmd; 2220 req->wValue = cpu_to_le16(value); 2221 req->wIndex = cpu_to_le16(index); 2222 req->wLength = cpu_to_le16(size); 2223 2224 usb_fill_control_urb(urb, dev->udev, 2225 usb_sndctrlpipe(dev->udev, 0), 2226 (void *)req, buf, size, 2227 usbnet_async_cmd_cb, req); 2228 urb->transfer_flags |= URB_FREE_BUFFER; 2229 2230 err = usb_submit_urb(urb, GFP_ATOMIC); 2231 if (err < 0) { 2232 netdev_err(dev->net, "Error submitting the control" 2233 " message: status=%d\n", err); 2234 goto fail_free; 2235 } 2236 return 0; 2237 2238 fail_free_buf: 2239 kfree(buf); 2240 fail_free: 2241 kfree(req); 2242 usb_free_urb(urb); 2243 fail: 2244 return err; 2245 2246 } 2247 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async); 2248 /*-------------------------------------------------------------------------*/ 2249 2250 static int __init usbnet_init(void) 2251 { 2252 /* Compiler should optimize this out. */ 2253 BUILD_BUG_ON( 2254 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data)); 2255 2256 eth_random_addr(node_id); 2257 return 0; 2258 } 2259 module_init(usbnet_init); 2260 2261 static void __exit usbnet_exit(void) 2262 { 2263 } 2264 module_exit(usbnet_exit); 2265 2266 MODULE_AUTHOR("David Brownell"); 2267 MODULE_DESCRIPTION("USB network driver framework"); 2268 MODULE_LICENSE("GPL"); 2269