1/* 2 * USB Network driver infrastructure 3 * Copyright (C) 2000-2005 by David Brownell 4 * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, see <http://www.gnu.org/licenses/>. 18 */ 19 20/* 21 * This is a generic "USB networking" framework that works with several 22 * kinds of full and high speed networking devices: host-to-host cables, 23 * smart usb peripherals, and actual Ethernet adapters. 24 * 25 * These devices usually differ in terms of control protocols (if they 26 * even have one!) and sometimes they define new framing to wrap or batch 27 * Ethernet packets. Otherwise, they talk to USB pretty much the same, 28 * so interface (un)binding, endpoint I/O queues, fault handling, and other 29 * issues can usefully be addressed by this framework. 30 */ 31 32// #define DEBUG // error path messages, extra info 33// #define VERBOSE // more; success messages 34 35#include <linux/module.h> 36#include <linux/init.h> 37#include <linux/netdevice.h> 38#include <linux/etherdevice.h> 39#include <linux/ctype.h> 40#include <linux/ethtool.h> 41#include <linux/workqueue.h> 42#include <linux/mii.h> 43#include <linux/usb.h> 44#include <linux/usb/usbnet.h> 45#include <linux/slab.h> 46#include <linux/kernel.h> 47#include <linux/pm_runtime.h> 48 49#define DRIVER_VERSION "22-Aug-2005" 50 51 52/*-------------------------------------------------------------------------*/ 53 54/* 55 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max. 56 * Several dozen bytes of IPv4 data can fit in two such transactions. 57 * One maximum size Ethernet packet takes twenty four of them. 58 * For high speed, each frame comfortably fits almost 36 max size 59 * Ethernet packets (so queues should be bigger). 60 * 61 * The goal is to let the USB host controller be busy for 5msec or 62 * more before an irq is required, under load. Jumbograms change 63 * the equation. 64 */ 65#define MAX_QUEUE_MEMORY (60 * 1518) 66#define RX_QLEN(dev) ((dev)->rx_qlen) 67#define TX_QLEN(dev) ((dev)->tx_qlen) 68 69// reawaken network queue this soon after stopping; else watchdog barks 70#define TX_TIMEOUT_JIFFIES (5*HZ) 71 72/* throttle rx/tx briefly after some faults, so hub_wq might disconnect() 73 * us (it polls at HZ/4 usually) before we report too many false errors. 74 */ 75#define THROTTLE_JIFFIES (HZ/8) 76 77// between wakeups 78#define UNLINK_TIMEOUT_MS 3 79 80/*-------------------------------------------------------------------------*/ 81 82// randomly generated ethernet address 83static u8 node_id [ETH_ALEN]; 84 85static const char driver_name [] = "usbnet"; 86 87/* use ethtool to change the level for any given device */ 88static int msg_level = -1; 89module_param (msg_level, int, 0); 90MODULE_PARM_DESC (msg_level, "Override default message level"); 91 92/*-------------------------------------------------------------------------*/ 93 94/* handles CDC Ethernet and many other network "bulk data" interfaces */ 95int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf) 96{ 97 int tmp; 98 struct usb_host_interface *alt = NULL; 99 struct usb_host_endpoint *in = NULL, *out = NULL; 100 struct usb_host_endpoint *status = NULL; 101 102 for (tmp = 0; tmp < intf->num_altsetting; tmp++) { 103 unsigned ep; 104 105 in = out = status = NULL; 106 alt = intf->altsetting + tmp; 107 108 /* take the first altsetting with in-bulk + out-bulk; 109 * remember any status endpoint, just in case; 110 * ignore other endpoints and altsettings. 111 */ 112 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) { 113 struct usb_host_endpoint *e; 114 int intr = 0; 115 116 e = alt->endpoint + ep; 117 switch (e->desc.bmAttributes) { 118 case USB_ENDPOINT_XFER_INT: 119 if (!usb_endpoint_dir_in(&e->desc)) 120 continue; 121 intr = 1; 122 /* FALLTHROUGH */ 123 case USB_ENDPOINT_XFER_BULK: 124 break; 125 default: 126 continue; 127 } 128 if (usb_endpoint_dir_in(&e->desc)) { 129 if (!intr && !in) 130 in = e; 131 else if (intr && !status) 132 status = e; 133 } else { 134 if (!out) 135 out = e; 136 } 137 } 138 if (in && out) 139 break; 140 } 141 if (!alt || !in || !out) 142 return -EINVAL; 143 144 if (alt->desc.bAlternateSetting != 0 || 145 !(dev->driver_info->flags & FLAG_NO_SETINT)) { 146 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber, 147 alt->desc.bAlternateSetting); 148 if (tmp < 0) 149 return tmp; 150 } 151 152 dev->in = usb_rcvbulkpipe (dev->udev, 153 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 154 dev->out = usb_sndbulkpipe (dev->udev, 155 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 156 dev->status = status; 157 return 0; 158} 159EXPORT_SYMBOL_GPL(usbnet_get_endpoints); 160 161int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress) 162{ 163 int tmp = -1, ret; 164 unsigned char buf [13]; 165 166 ret = usb_string(dev->udev, iMACAddress, buf, sizeof buf); 167 if (ret == 12) 168 tmp = hex2bin(dev->net->dev_addr, buf, 6); 169 if (tmp < 0) { 170 dev_dbg(&dev->udev->dev, 171 "bad MAC string %d fetch, %d\n", iMACAddress, tmp); 172 if (ret >= 0) 173 ret = -EINVAL; 174 return ret; 175 } 176 return 0; 177} 178EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr); 179 180static 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 212static 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 */ 250int 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} 267EXPORT_SYMBOL_GPL(usbnet_status_start); 268 269/* For resume; submit interrupt URB if previously submitted */ 270static 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 */ 285void 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} 300EXPORT_SYMBOL_GPL(usbnet_status_stop); 301 302/* For suspend; always kill interrupt URB */ 303static 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 */ 317void 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} 342EXPORT_SYMBOL_GPL(usbnet_skb_return); 343 344/* must be called if hard_mtu or rx_urb_size changed */ 345void 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} 367EXPORT_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 376int 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} 402EXPORT_SYMBOL_GPL(usbnet_change_mtu); 403 404/* The caller must hold list->lock */ 405static 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 420static 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 */ 445void 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} 455EXPORT_SYMBOL_GPL(usbnet_defer_kevent); 456 457/*-------------------------------------------------------------------------*/ 458 459static void rx_complete (struct urb *urb); 460 461static 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 534static 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 558done: 559 skb_queue_tail(&dev->done, skb); 560} 561 562/*-------------------------------------------------------------------------*/ 563 564static 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 hub_wq disconnect() delays. 599 * throttle down resubmits, to avoid log floods; just temporarily, 600 * so we still recover when the fault isn't a hub_wq 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 } 611block: 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/*-------------------------------------------------------------------------*/ 656void 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} 662EXPORT_SYMBOL_GPL(usbnet_pause_rx); 663 664void 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} 681EXPORT_SYMBOL_GPL(usbnet_resume_rx); 682 683void usbnet_purge_paused_rxq(struct usbnet *dev) 684{ 685 skb_queue_purge(&dev->rxq_pause); 686} 687EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq); 688 689/*-------------------------------------------------------------------------*/ 690 691// unlink pending rx/tx; completion handlers do all other cleanup 692 693static 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; 711found: 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 741void 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} 748EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); 749 750/*-------------------------------------------------------------------------*/ 751 752// precondition: never called in_interrupt 753static 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 777int 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, mpn; 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 mpn = !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags); 813 814 /* deferred work (task, timer, softirq) must also stop. 815 * can't flush_scheduled_work() until we drop rtnl (later), 816 * else workers could deadlock; so make workers a NOP. 817 */ 818 dev->flags = 0; 819 del_timer_sync (&dev->delay); 820 tasklet_kill (&dev->bh); 821 if (!pm) 822 usb_autopm_put_interface(dev->intf); 823 824 if (info->manage_power && mpn) 825 info->manage_power(dev, 0); 826 else 827 usb_autopm_put_interface(dev->intf); 828 829 return 0; 830} 831EXPORT_SYMBOL_GPL(usbnet_stop); 832 833/*-------------------------------------------------------------------------*/ 834 835// posts reads, and enables write queuing 836 837// precondition: never called in_interrupt 838 839int usbnet_open (struct net_device *net) 840{ 841 struct usbnet *dev = netdev_priv(net); 842 int retval; 843 struct driver_info *info = dev->driver_info; 844 845 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { 846 netif_info(dev, ifup, dev->net, 847 "resumption fail (%d) usbnet usb-%s-%s, %s\n", 848 retval, 849 dev->udev->bus->bus_name, 850 dev->udev->devpath, 851 info->description); 852 goto done_nopm; 853 } 854 855 // put into "known safe" state 856 if (info->reset && (retval = info->reset (dev)) < 0) { 857 netif_info(dev, ifup, dev->net, 858 "open reset fail (%d) usbnet usb-%s-%s, %s\n", 859 retval, 860 dev->udev->bus->bus_name, 861 dev->udev->devpath, 862 info->description); 863 goto done; 864 } 865 866 /* hard_mtu or rx_urb_size may change in reset() */ 867 usbnet_update_max_qlen(dev); 868 869 // insist peer be connected 870 if (info->check_connect && (retval = info->check_connect (dev)) < 0) { 871 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval); 872 goto done; 873 } 874 875 /* start any status interrupt transfer */ 876 if (dev->interrupt) { 877 retval = usbnet_status_start(dev, GFP_KERNEL); 878 if (retval < 0) { 879 netif_err(dev, ifup, dev->net, 880 "intr submit %d\n", retval); 881 goto done; 882 } 883 } 884 885 set_bit(EVENT_DEV_OPEN, &dev->flags); 886 netif_start_queue (net); 887 netif_info(dev, ifup, dev->net, 888 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n", 889 (int)RX_QLEN(dev), (int)TX_QLEN(dev), 890 dev->net->mtu, 891 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" : 892 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" : 893 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" : 894 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" : 895 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" : 896 "simple"); 897 898 /* reset rx error state */ 899 dev->pkt_cnt = 0; 900 dev->pkt_err = 0; 901 clear_bit(EVENT_RX_KILL, &dev->flags); 902 903 // delay posting reads until we're fully open 904 tasklet_schedule (&dev->bh); 905 if (info->manage_power) { 906 retval = info->manage_power(dev, 1); 907 if (retval < 0) { 908 retval = 0; 909 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags); 910 } else { 911 usb_autopm_put_interface(dev->intf); 912 } 913 } 914 return retval; 915done: 916 usb_autopm_put_interface(dev->intf); 917done_nopm: 918 return retval; 919} 920EXPORT_SYMBOL_GPL(usbnet_open); 921 922/*-------------------------------------------------------------------------*/ 923 924/* ethtool methods; minidrivers may need to add some more, but 925 * they'll probably want to use this base set. 926 */ 927 928int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd) 929{ 930 struct usbnet *dev = netdev_priv(net); 931 932 if (!dev->mii.mdio_read) 933 return -EOPNOTSUPP; 934 935 return mii_ethtool_gset(&dev->mii, cmd); 936} 937EXPORT_SYMBOL_GPL(usbnet_get_settings); 938 939int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd) 940{ 941 struct usbnet *dev = netdev_priv(net); 942 int retval; 943 944 if (!dev->mii.mdio_write) 945 return -EOPNOTSUPP; 946 947 retval = mii_ethtool_sset(&dev->mii, cmd); 948 949 /* link speed/duplex might have changed */ 950 if (dev->driver_info->link_reset) 951 dev->driver_info->link_reset(dev); 952 953 /* hard_mtu or rx_urb_size may change in link_reset() */ 954 usbnet_update_max_qlen(dev); 955 956 return retval; 957 958} 959EXPORT_SYMBOL_GPL(usbnet_set_settings); 960 961u32 usbnet_get_link (struct net_device *net) 962{ 963 struct usbnet *dev = netdev_priv(net); 964 965 /* If a check_connect is defined, return its result */ 966 if (dev->driver_info->check_connect) 967 return dev->driver_info->check_connect (dev) == 0; 968 969 /* if the device has mii operations, use those */ 970 if (dev->mii.mdio_read) 971 return mii_link_ok(&dev->mii); 972 973 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ 974 return ethtool_op_get_link(net); 975} 976EXPORT_SYMBOL_GPL(usbnet_get_link); 977 978int usbnet_nway_reset(struct net_device *net) 979{ 980 struct usbnet *dev = netdev_priv(net); 981 982 if (!dev->mii.mdio_write) 983 return -EOPNOTSUPP; 984 985 return mii_nway_restart(&dev->mii); 986} 987EXPORT_SYMBOL_GPL(usbnet_nway_reset); 988 989void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) 990{ 991 struct usbnet *dev = netdev_priv(net); 992 993 strlcpy (info->driver, dev->driver_name, sizeof info->driver); 994 strlcpy (info->version, DRIVER_VERSION, sizeof info->version); 995 strlcpy (info->fw_version, dev->driver_info->description, 996 sizeof info->fw_version); 997 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); 998} 999EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); 1000 1001u32 usbnet_get_msglevel (struct net_device *net) 1002{ 1003 struct usbnet *dev = netdev_priv(net); 1004 1005 return dev->msg_enable; 1006} 1007EXPORT_SYMBOL_GPL(usbnet_get_msglevel); 1008 1009void usbnet_set_msglevel (struct net_device *net, u32 level) 1010{ 1011 struct usbnet *dev = netdev_priv(net); 1012 1013 dev->msg_enable = level; 1014} 1015EXPORT_SYMBOL_GPL(usbnet_set_msglevel); 1016 1017/* drivers may override default ethtool_ops in their bind() routine */ 1018static const struct ethtool_ops usbnet_ethtool_ops = { 1019 .get_settings = usbnet_get_settings, 1020 .set_settings = usbnet_set_settings, 1021 .get_link = usbnet_get_link, 1022 .nway_reset = usbnet_nway_reset, 1023 .get_drvinfo = usbnet_get_drvinfo, 1024 .get_msglevel = usbnet_get_msglevel, 1025 .set_msglevel = usbnet_set_msglevel, 1026 .get_ts_info = ethtool_op_get_ts_info, 1027}; 1028 1029/*-------------------------------------------------------------------------*/ 1030 1031static void __handle_link_change(struct usbnet *dev) 1032{ 1033 if (!test_bit(EVENT_DEV_OPEN, &dev->flags)) 1034 return; 1035 1036 if (!netif_carrier_ok(dev->net)) { 1037 /* kill URBs for reading packets to save bus bandwidth */ 1038 unlink_urbs(dev, &dev->rxq); 1039 1040 /* 1041 * tx_timeout will unlink URBs for sending packets and 1042 * tx queue is stopped by netcore after link becomes off 1043 */ 1044 } else { 1045 /* submitting URBs for reading packets */ 1046 tasklet_schedule(&dev->bh); 1047 } 1048 1049 /* hard_mtu or rx_urb_size may change during link change */ 1050 usbnet_update_max_qlen(dev); 1051 1052 clear_bit(EVENT_LINK_CHANGE, &dev->flags); 1053} 1054 1055static void usbnet_set_rx_mode(struct net_device *net) 1056{ 1057 struct usbnet *dev = netdev_priv(net); 1058 1059 usbnet_defer_kevent(dev, EVENT_SET_RX_MODE); 1060} 1061 1062static void __handle_set_rx_mode(struct usbnet *dev) 1063{ 1064 if (dev->driver_info->set_rx_mode) 1065 (dev->driver_info->set_rx_mode)(dev); 1066 1067 clear_bit(EVENT_SET_RX_MODE, &dev->flags); 1068} 1069 1070/* work that cannot be done in interrupt context uses keventd. 1071 * 1072 * NOTE: with 2.5 we could do more of this using completion callbacks, 1073 * especially now that control transfers can be queued. 1074 */ 1075static void 1076usbnet_deferred_kevent (struct work_struct *work) 1077{ 1078 struct usbnet *dev = 1079 container_of(work, struct usbnet, kevent); 1080 int status; 1081 1082 /* usb_clear_halt() needs a thread context */ 1083 if (test_bit (EVENT_TX_HALT, &dev->flags)) { 1084 unlink_urbs (dev, &dev->txq); 1085 status = usb_autopm_get_interface(dev->intf); 1086 if (status < 0) 1087 goto fail_pipe; 1088 status = usb_clear_halt (dev->udev, dev->out); 1089 usb_autopm_put_interface(dev->intf); 1090 if (status < 0 && 1091 status != -EPIPE && 1092 status != -ESHUTDOWN) { 1093 if (netif_msg_tx_err (dev)) 1094fail_pipe: 1095 netdev_err(dev->net, "can't clear tx halt, status %d\n", 1096 status); 1097 } else { 1098 clear_bit (EVENT_TX_HALT, &dev->flags); 1099 if (status != -ESHUTDOWN) 1100 netif_wake_queue (dev->net); 1101 } 1102 } 1103 if (test_bit (EVENT_RX_HALT, &dev->flags)) { 1104 unlink_urbs (dev, &dev->rxq); 1105 status = usb_autopm_get_interface(dev->intf); 1106 if (status < 0) 1107 goto fail_halt; 1108 status = usb_clear_halt (dev->udev, dev->in); 1109 usb_autopm_put_interface(dev->intf); 1110 if (status < 0 && 1111 status != -EPIPE && 1112 status != -ESHUTDOWN) { 1113 if (netif_msg_rx_err (dev)) 1114fail_halt: 1115 netdev_err(dev->net, "can't clear rx halt, status %d\n", 1116 status); 1117 } else { 1118 clear_bit (EVENT_RX_HALT, &dev->flags); 1119 tasklet_schedule (&dev->bh); 1120 } 1121 } 1122 1123 /* tasklet could resubmit itself forever if memory is tight */ 1124 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { 1125 struct urb *urb = NULL; 1126 int resched = 1; 1127 1128 if (netif_running (dev->net)) 1129 urb = usb_alloc_urb (0, GFP_KERNEL); 1130 else 1131 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1132 if (urb != NULL) { 1133 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1134 status = usb_autopm_get_interface(dev->intf); 1135 if (status < 0) { 1136 usb_free_urb(urb); 1137 goto fail_lowmem; 1138 } 1139 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) 1140 resched = 0; 1141 usb_autopm_put_interface(dev->intf); 1142fail_lowmem: 1143 if (resched) 1144 tasklet_schedule (&dev->bh); 1145 } 1146 } 1147 1148 if (test_bit (EVENT_LINK_RESET, &dev->flags)) { 1149 struct driver_info *info = dev->driver_info; 1150 int retval = 0; 1151 1152 clear_bit (EVENT_LINK_RESET, &dev->flags); 1153 status = usb_autopm_get_interface(dev->intf); 1154 if (status < 0) 1155 goto skip_reset; 1156 if(info->link_reset && (retval = info->link_reset(dev)) < 0) { 1157 usb_autopm_put_interface(dev->intf); 1158skip_reset: 1159 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", 1160 retval, 1161 dev->udev->bus->bus_name, 1162 dev->udev->devpath, 1163 info->description); 1164 } else { 1165 usb_autopm_put_interface(dev->intf); 1166 } 1167 1168 /* handle link change from link resetting */ 1169 __handle_link_change(dev); 1170 } 1171 1172 if (test_bit (EVENT_LINK_CHANGE, &dev->flags)) 1173 __handle_link_change(dev); 1174 1175 if (test_bit (EVENT_SET_RX_MODE, &dev->flags)) 1176 __handle_set_rx_mode(dev); 1177 1178 1179 if (dev->flags) 1180 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); 1181} 1182 1183/*-------------------------------------------------------------------------*/ 1184 1185static void tx_complete (struct urb *urb) 1186{ 1187 struct sk_buff *skb = (struct sk_buff *) urb->context; 1188 struct skb_data *entry = (struct skb_data *) skb->cb; 1189 struct usbnet *dev = entry->dev; 1190 1191 if (urb->status == 0) { 1192 dev->net->stats.tx_packets += entry->packets; 1193 dev->net->stats.tx_bytes += entry->length; 1194 } else { 1195 dev->net->stats.tx_errors++; 1196 1197 switch (urb->status) { 1198 case -EPIPE: 1199 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1200 break; 1201 1202 /* software-driven interface shutdown */ 1203 case -ECONNRESET: // async unlink 1204 case -ESHUTDOWN: // hardware gone 1205 break; 1206 1207 /* like rx, tx gets controller i/o faults during hub_wq 1208 * delays and so it uses the same throttling mechanism. 1209 */ 1210 case -EPROTO: 1211 case -ETIME: 1212 case -EILSEQ: 1213 usb_mark_last_busy(dev->udev); 1214 if (!timer_pending (&dev->delay)) { 1215 mod_timer (&dev->delay, 1216 jiffies + THROTTLE_JIFFIES); 1217 netif_dbg(dev, link, dev->net, 1218 "tx throttle %d\n", urb->status); 1219 } 1220 netif_stop_queue (dev->net); 1221 break; 1222 default: 1223 netif_dbg(dev, tx_err, dev->net, 1224 "tx err %d\n", entry->urb->status); 1225 break; 1226 } 1227 } 1228 1229 usb_autopm_put_interface_async(dev->intf); 1230 (void) defer_bh(dev, skb, &dev->txq, tx_done); 1231} 1232 1233/*-------------------------------------------------------------------------*/ 1234 1235void usbnet_tx_timeout (struct net_device *net) 1236{ 1237 struct usbnet *dev = netdev_priv(net); 1238 1239 unlink_urbs (dev, &dev->txq); 1240 tasklet_schedule (&dev->bh); 1241 /* this needs to be handled individually because the generic layer 1242 * doesn't know what is sufficient and could not restore private 1243 * information if a remedy of an unconditional reset were used. 1244 */ 1245 if (dev->driver_info->recover) 1246 (dev->driver_info->recover)(dev); 1247} 1248EXPORT_SYMBOL_GPL(usbnet_tx_timeout); 1249 1250/*-------------------------------------------------------------------------*/ 1251 1252static int build_dma_sg(const struct sk_buff *skb, struct urb *urb) 1253{ 1254 unsigned num_sgs, total_len = 0; 1255 int i, s = 0; 1256 1257 num_sgs = skb_shinfo(skb)->nr_frags + 1; 1258 if (num_sgs == 1) 1259 return 0; 1260 1261 /* reserve one for zero packet */ 1262 urb->sg = kmalloc((num_sgs + 1) * sizeof(struct scatterlist), 1263 GFP_ATOMIC); 1264 if (!urb->sg) 1265 return -ENOMEM; 1266 1267 urb->num_sgs = num_sgs; 1268 sg_init_table(urb->sg, urb->num_sgs + 1); 1269 1270 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb)); 1271 total_len += skb_headlen(skb); 1272 1273 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1274 struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i]; 1275 1276 total_len += skb_frag_size(f); 1277 sg_set_page(&urb->sg[i + s], f->page.p, f->size, 1278 f->page_offset); 1279 } 1280 urb->transfer_buffer_length = total_len; 1281 1282 return 1; 1283} 1284 1285netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, 1286 struct net_device *net) 1287{ 1288 struct usbnet *dev = netdev_priv(net); 1289 unsigned int length; 1290 struct urb *urb = NULL; 1291 struct skb_data *entry; 1292 struct driver_info *info = dev->driver_info; 1293 unsigned long flags; 1294 int retval; 1295 1296 if (skb) 1297 skb_tx_timestamp(skb); 1298 1299 // some devices want funky USB-level framing, for 1300 // win32 driver (usually) and/or hardware quirks 1301 if (info->tx_fixup) { 1302 skb = info->tx_fixup (dev, skb, GFP_ATOMIC); 1303 if (!skb) { 1304 /* packet collected; minidriver waiting for more */ 1305 if (info->flags & FLAG_MULTI_PACKET) 1306 goto not_drop; 1307 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); 1308 goto drop; 1309 } 1310 } 1311 1312 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { 1313 netif_dbg(dev, tx_err, dev->net, "no urb\n"); 1314 goto drop; 1315 } 1316 1317 entry = (struct skb_data *) skb->cb; 1318 entry->urb = urb; 1319 entry->dev = dev; 1320 1321 usb_fill_bulk_urb (urb, dev->udev, dev->out, 1322 skb->data, skb->len, tx_complete, skb); 1323 if (dev->can_dma_sg) { 1324 if (build_dma_sg(skb, urb) < 0) 1325 goto drop; 1326 } 1327 length = urb->transfer_buffer_length; 1328 1329 /* don't assume the hardware handles USB_ZERO_PACKET 1330 * NOTE: strictly conforming cdc-ether devices should expect 1331 * the ZLP here, but ignore the one-byte packet. 1332 * NOTE2: CDC NCM specification is different from CDC ECM when 1333 * handling ZLP/short packets, so cdc_ncm driver will make short 1334 * packet itself if needed. 1335 */ 1336 if (length % dev->maxpacket == 0) { 1337 if (!(info->flags & FLAG_SEND_ZLP)) { 1338 if (!(info->flags & FLAG_MULTI_PACKET)) { 1339 length++; 1340 if (skb_tailroom(skb) && !urb->num_sgs) { 1341 skb->data[skb->len] = 0; 1342 __skb_put(skb, 1); 1343 } else if (urb->num_sgs) 1344 sg_set_buf(&urb->sg[urb->num_sgs++], 1345 dev->padding_pkt, 1); 1346 } 1347 } else 1348 urb->transfer_flags |= URB_ZERO_PACKET; 1349 } 1350 urb->transfer_buffer_length = length; 1351 1352 if (info->flags & FLAG_MULTI_PACKET) { 1353 /* Driver has set number of packets and a length delta. 1354 * Calculate the complete length and ensure that it's 1355 * positive. 1356 */ 1357 entry->length += length; 1358 if (WARN_ON_ONCE(entry->length <= 0)) 1359 entry->length = length; 1360 } else { 1361 usbnet_set_skb_tx_stats(skb, 1, length); 1362 } 1363 1364 spin_lock_irqsave(&dev->txq.lock, flags); 1365 retval = usb_autopm_get_interface_async(dev->intf); 1366 if (retval < 0) { 1367 spin_unlock_irqrestore(&dev->txq.lock, flags); 1368 goto drop; 1369 } 1370 1371#ifdef CONFIG_PM 1372 /* if this triggers the device is still a sleep */ 1373 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { 1374 /* transmission will be done in resume */ 1375 usb_anchor_urb(urb, &dev->deferred); 1376 /* no use to process more packets */ 1377 netif_stop_queue(net); 1378 usb_put_urb(urb); 1379 spin_unlock_irqrestore(&dev->txq.lock, flags); 1380 netdev_dbg(dev->net, "Delaying transmission for resumption\n"); 1381 goto deferred; 1382 } 1383#endif 1384 1385 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { 1386 case -EPIPE: 1387 netif_stop_queue (net); 1388 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1389 usb_autopm_put_interface_async(dev->intf); 1390 break; 1391 default: 1392 usb_autopm_put_interface_async(dev->intf); 1393 netif_dbg(dev, tx_err, dev->net, 1394 "tx: submit urb err %d\n", retval); 1395 break; 1396 case 0: 1397 net->trans_start = jiffies; 1398 __usbnet_queue_skb(&dev->txq, skb, tx_start); 1399 if (dev->txq.qlen >= TX_QLEN (dev)) 1400 netif_stop_queue (net); 1401 } 1402 spin_unlock_irqrestore (&dev->txq.lock, flags); 1403 1404 if (retval) { 1405 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); 1406drop: 1407 dev->net->stats.tx_dropped++; 1408not_drop: 1409 if (skb) 1410 dev_kfree_skb_any (skb); 1411 if (urb) { 1412 kfree(urb->sg); 1413 usb_free_urb(urb); 1414 } 1415 } else 1416 netif_dbg(dev, tx_queued, dev->net, 1417 "> tx, len %u, type 0x%x\n", length, skb->protocol); 1418#ifdef CONFIG_PM 1419deferred: 1420#endif 1421 return NETDEV_TX_OK; 1422} 1423EXPORT_SYMBOL_GPL(usbnet_start_xmit); 1424 1425static int rx_alloc_submit(struct usbnet *dev, gfp_t flags) 1426{ 1427 struct urb *urb; 1428 int i; 1429 int ret = 0; 1430 1431 /* don't refill the queue all at once */ 1432 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) { 1433 urb = usb_alloc_urb(0, flags); 1434 if (urb != NULL) { 1435 ret = rx_submit(dev, urb, flags); 1436 if (ret) 1437 goto err; 1438 } else { 1439 ret = -ENOMEM; 1440 goto err; 1441 } 1442 } 1443err: 1444 return ret; 1445} 1446 1447/*-------------------------------------------------------------------------*/ 1448 1449// tasklet (work deferred from completions, in_irq) or timer 1450 1451static void usbnet_bh (unsigned long param) 1452{ 1453 struct usbnet *dev = (struct usbnet *) param; 1454 struct sk_buff *skb; 1455 struct skb_data *entry; 1456 1457 while ((skb = skb_dequeue (&dev->done))) { 1458 entry = (struct skb_data *) skb->cb; 1459 switch (entry->state) { 1460 case rx_done: 1461 entry->state = rx_cleanup; 1462 rx_process (dev, skb); 1463 continue; 1464 case tx_done: 1465 kfree(entry->urb->sg); 1466 case rx_cleanup: 1467 usb_free_urb (entry->urb); 1468 dev_kfree_skb (skb); 1469 continue; 1470 default: 1471 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); 1472 } 1473 } 1474 1475 /* restart RX again after disabling due to high error rate */ 1476 clear_bit(EVENT_RX_KILL, &dev->flags); 1477 1478 /* waiting for all pending urbs to complete? 1479 * only then can we forgo submitting anew 1480 */ 1481 if (waitqueue_active(&dev->wait)) { 1482 if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0) 1483 wake_up_all(&dev->wait); 1484 1485 // or are we maybe short a few urbs? 1486 } else if (netif_running (dev->net) && 1487 netif_device_present (dev->net) && 1488 netif_carrier_ok(dev->net) && 1489 !timer_pending (&dev->delay) && 1490 !test_bit (EVENT_RX_HALT, &dev->flags)) { 1491 int temp = dev->rxq.qlen; 1492 1493 if (temp < RX_QLEN(dev)) { 1494 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK) 1495 return; 1496 if (temp != dev->rxq.qlen) 1497 netif_dbg(dev, link, dev->net, 1498 "rxqlen %d --> %d\n", 1499 temp, dev->rxq.qlen); 1500 if (dev->rxq.qlen < RX_QLEN(dev)) 1501 tasklet_schedule (&dev->bh); 1502 } 1503 if (dev->txq.qlen < TX_QLEN (dev)) 1504 netif_wake_queue (dev->net); 1505 } 1506} 1507 1508 1509/*------------------------------------------------------------------------- 1510 * 1511 * USB Device Driver support 1512 * 1513 *-------------------------------------------------------------------------*/ 1514 1515// precondition: never called in_interrupt 1516 1517void usbnet_disconnect (struct usb_interface *intf) 1518{ 1519 struct usbnet *dev; 1520 struct usb_device *xdev; 1521 struct net_device *net; 1522 1523 dev = usb_get_intfdata(intf); 1524 usb_set_intfdata(intf, NULL); 1525 if (!dev) 1526 return; 1527 1528 xdev = interface_to_usbdev (intf); 1529 1530 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", 1531 intf->dev.driver->name, 1532 xdev->bus->bus_name, xdev->devpath, 1533 dev->driver_info->description); 1534 1535 net = dev->net; 1536 unregister_netdev (net); 1537 1538 cancel_work_sync(&dev->kevent); 1539 1540 usb_scuttle_anchored_urbs(&dev->deferred); 1541 1542 if (dev->driver_info->unbind) 1543 dev->driver_info->unbind (dev, intf); 1544 1545 usb_kill_urb(dev->interrupt); 1546 usb_free_urb(dev->interrupt); 1547 kfree(dev->padding_pkt); 1548 1549 free_netdev(net); 1550} 1551EXPORT_SYMBOL_GPL(usbnet_disconnect); 1552 1553static const struct net_device_ops usbnet_netdev_ops = { 1554 .ndo_open = usbnet_open, 1555 .ndo_stop = usbnet_stop, 1556 .ndo_start_xmit = usbnet_start_xmit, 1557 .ndo_tx_timeout = usbnet_tx_timeout, 1558 .ndo_set_rx_mode = usbnet_set_rx_mode, 1559 .ndo_change_mtu = usbnet_change_mtu, 1560 .ndo_set_mac_address = eth_mac_addr, 1561 .ndo_validate_addr = eth_validate_addr, 1562}; 1563 1564/*-------------------------------------------------------------------------*/ 1565 1566// precondition: never called in_interrupt 1567 1568static struct device_type wlan_type = { 1569 .name = "wlan", 1570}; 1571 1572static struct device_type wwan_type = { 1573 .name = "wwan", 1574}; 1575 1576int 1577usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) 1578{ 1579 struct usbnet *dev; 1580 struct net_device *net; 1581 struct usb_host_interface *interface; 1582 struct driver_info *info; 1583 struct usb_device *xdev; 1584 int status; 1585 const char *name; 1586 struct usb_driver *driver = to_usb_driver(udev->dev.driver); 1587 1588 /* usbnet already took usb runtime pm, so have to enable the feature 1589 * for usb interface, otherwise usb_autopm_get_interface may return 1590 * failure if RUNTIME_PM is enabled. 1591 */ 1592 if (!driver->supports_autosuspend) { 1593 driver->supports_autosuspend = 1; 1594 pm_runtime_enable(&udev->dev); 1595 } 1596 1597 name = udev->dev.driver->name; 1598 info = (struct driver_info *) prod->driver_info; 1599 if (!info) { 1600 dev_dbg (&udev->dev, "blacklisted by %s\n", name); 1601 return -ENODEV; 1602 } 1603 xdev = interface_to_usbdev (udev); 1604 interface = udev->cur_altsetting; 1605 1606 status = -ENOMEM; 1607 1608 // set up our own records 1609 net = alloc_etherdev(sizeof(*dev)); 1610 if (!net) 1611 goto out; 1612 1613 /* netdev_printk() needs this so do it as early as possible */ 1614 SET_NETDEV_DEV(net, &udev->dev); 1615 1616 dev = netdev_priv(net); 1617 dev->udev = xdev; 1618 dev->intf = udev; 1619 dev->driver_info = info; 1620 dev->driver_name = name; 1621 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV 1622 | NETIF_MSG_PROBE | NETIF_MSG_LINK); 1623 init_waitqueue_head(&dev->wait); 1624 skb_queue_head_init (&dev->rxq); 1625 skb_queue_head_init (&dev->txq); 1626 skb_queue_head_init (&dev->done); 1627 skb_queue_head_init(&dev->rxq_pause); 1628 dev->bh.func = usbnet_bh; 1629 dev->bh.data = (unsigned long) dev; 1630 INIT_WORK (&dev->kevent, usbnet_deferred_kevent); 1631 init_usb_anchor(&dev->deferred); 1632 dev->delay.function = usbnet_bh; 1633 dev->delay.data = (unsigned long) dev; 1634 init_timer (&dev->delay); 1635 mutex_init (&dev->phy_mutex); 1636 mutex_init(&dev->interrupt_mutex); 1637 dev->interrupt_count = 0; 1638 1639 dev->net = net; 1640 strcpy (net->name, "usb%d"); 1641 memcpy (net->dev_addr, node_id, sizeof node_id); 1642 1643 /* rx and tx sides can use different message sizes; 1644 * bind() should set rx_urb_size in that case. 1645 */ 1646 dev->hard_mtu = net->mtu + net->hard_header_len; 1647#if 0 1648// dma_supported() is deeply broken on almost all architectures 1649 // possible with some EHCI controllers 1650 if (dma_supported (&udev->dev, DMA_BIT_MASK(64))) 1651 net->features |= NETIF_F_HIGHDMA; 1652#endif 1653 1654 net->netdev_ops = &usbnet_netdev_ops; 1655 net->watchdog_timeo = TX_TIMEOUT_JIFFIES; 1656 net->ethtool_ops = &usbnet_ethtool_ops; 1657 1658 // allow device-specific bind/init procedures 1659 // NOTE net->name still not usable ... 1660 if (info->bind) { 1661 status = info->bind (dev, udev); 1662 if (status < 0) 1663 goto out1; 1664 1665 // heuristic: "usb%d" for links we know are two-host, 1666 // else "eth%d" when there's reasonable doubt. userspace 1667 // can rename the link if it knows better. 1668 if ((dev->driver_info->flags & FLAG_ETHER) != 0 && 1669 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 || 1670 (net->dev_addr [0] & 0x02) == 0)) 1671 strcpy (net->name, "eth%d"); 1672 /* WLAN devices should always be named "wlan%d" */ 1673 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1674 strcpy(net->name, "wlan%d"); 1675 /* WWAN devices should always be named "wwan%d" */ 1676 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1677 strcpy(net->name, "wwan%d"); 1678 1679 /* devices that cannot do ARP */ 1680 if ((dev->driver_info->flags & FLAG_NOARP) != 0) 1681 net->flags |= IFF_NOARP; 1682 1683 /* maybe the remote can't receive an Ethernet MTU */ 1684 if (net->mtu > (dev->hard_mtu - net->hard_header_len)) 1685 net->mtu = dev->hard_mtu - net->hard_header_len; 1686 } else if (!info->in || !info->out) 1687 status = usbnet_get_endpoints (dev, udev); 1688 else { 1689 dev->in = usb_rcvbulkpipe (xdev, info->in); 1690 dev->out = usb_sndbulkpipe (xdev, info->out); 1691 if (!(info->flags & FLAG_NO_SETINT)) 1692 status = usb_set_interface (xdev, 1693 interface->desc.bInterfaceNumber, 1694 interface->desc.bAlternateSetting); 1695 else 1696 status = 0; 1697 1698 } 1699 if (status >= 0 && dev->status) 1700 status = init_status (dev, udev); 1701 if (status < 0) 1702 goto out3; 1703 1704 if (!dev->rx_urb_size) 1705 dev->rx_urb_size = dev->hard_mtu; 1706 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); 1707 1708 /* let userspace know we have a random address */ 1709 if (ether_addr_equal(net->dev_addr, node_id)) 1710 net->addr_assign_type = NET_ADDR_RANDOM; 1711 1712 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1713 SET_NETDEV_DEVTYPE(net, &wlan_type); 1714 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1715 SET_NETDEV_DEVTYPE(net, &wwan_type); 1716 1717 /* initialize max rx_qlen and tx_qlen */ 1718 usbnet_update_max_qlen(dev); 1719 1720 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) && 1721 !(info->flags & FLAG_MULTI_PACKET)) { 1722 dev->padding_pkt = kzalloc(1, GFP_KERNEL); 1723 if (!dev->padding_pkt) { 1724 status = -ENOMEM; 1725 goto out4; 1726 } 1727 } 1728 1729 status = register_netdev (net); 1730 if (status) 1731 goto out5; 1732 netif_info(dev, probe, dev->net, 1733 "register '%s' at usb-%s-%s, %s, %pM\n", 1734 udev->dev.driver->name, 1735 xdev->bus->bus_name, xdev->devpath, 1736 dev->driver_info->description, 1737 net->dev_addr); 1738 1739 // ok, it's ready to go. 1740 usb_set_intfdata (udev, dev); 1741 1742 netif_device_attach (net); 1743 1744 if (dev->driver_info->flags & FLAG_LINK_INTR) 1745 usbnet_link_change(dev, 0, 0); 1746 1747 return 0; 1748 1749out5: 1750 kfree(dev->padding_pkt); 1751out4: 1752 usb_free_urb(dev->interrupt); 1753out3: 1754 if (info->unbind) 1755 info->unbind (dev, udev); 1756out1: 1757 free_netdev(net); 1758out: 1759 return status; 1760} 1761EXPORT_SYMBOL_GPL(usbnet_probe); 1762 1763/*-------------------------------------------------------------------------*/ 1764 1765/* 1766 * suspend the whole driver as soon as the first interface is suspended 1767 * resume only when the last interface is resumed 1768 */ 1769 1770int usbnet_suspend (struct usb_interface *intf, pm_message_t message) 1771{ 1772 struct usbnet *dev = usb_get_intfdata(intf); 1773 1774 if (!dev->suspend_count++) { 1775 spin_lock_irq(&dev->txq.lock); 1776 /* don't autosuspend while transmitting */ 1777 if (dev->txq.qlen && PMSG_IS_AUTO(message)) { 1778 dev->suspend_count--; 1779 spin_unlock_irq(&dev->txq.lock); 1780 return -EBUSY; 1781 } else { 1782 set_bit(EVENT_DEV_ASLEEP, &dev->flags); 1783 spin_unlock_irq(&dev->txq.lock); 1784 } 1785 /* 1786 * accelerate emptying of the rx and queues, to avoid 1787 * having everything error out. 1788 */ 1789 netif_device_detach (dev->net); 1790 usbnet_terminate_urbs(dev); 1791 __usbnet_status_stop_force(dev); 1792 1793 /* 1794 * reattach so runtime management can use and 1795 * wake the device 1796 */ 1797 netif_device_attach (dev->net); 1798 } 1799 return 0; 1800} 1801EXPORT_SYMBOL_GPL(usbnet_suspend); 1802 1803int usbnet_resume (struct usb_interface *intf) 1804{ 1805 struct usbnet *dev = usb_get_intfdata(intf); 1806 struct sk_buff *skb; 1807 struct urb *res; 1808 int retval; 1809 1810 if (!--dev->suspend_count) { 1811 /* resume interrupt URB if it was previously submitted */ 1812 __usbnet_status_start_force(dev, GFP_NOIO); 1813 1814 spin_lock_irq(&dev->txq.lock); 1815 while ((res = usb_get_from_anchor(&dev->deferred))) { 1816 1817 skb = (struct sk_buff *)res->context; 1818 retval = usb_submit_urb(res, GFP_ATOMIC); 1819 if (retval < 0) { 1820 dev_kfree_skb_any(skb); 1821 kfree(res->sg); 1822 usb_free_urb(res); 1823 usb_autopm_put_interface_async(dev->intf); 1824 } else { 1825 dev->net->trans_start = jiffies; 1826 __skb_queue_tail(&dev->txq, skb); 1827 } 1828 } 1829 1830 smp_mb(); 1831 clear_bit(EVENT_DEV_ASLEEP, &dev->flags); 1832 spin_unlock_irq(&dev->txq.lock); 1833 1834 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) { 1835 /* handle remote wakeup ASAP 1836 * we cannot race against stop 1837 */ 1838 if (netif_device_present(dev->net) && 1839 !timer_pending(&dev->delay) && 1840 !test_bit(EVENT_RX_HALT, &dev->flags)) 1841 rx_alloc_submit(dev, GFP_NOIO); 1842 1843 if (!(dev->txq.qlen >= TX_QLEN(dev))) 1844 netif_tx_wake_all_queues(dev->net); 1845 tasklet_schedule (&dev->bh); 1846 } 1847 } 1848 1849 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) 1850 usb_autopm_get_interface_no_resume(intf); 1851 1852 return 0; 1853} 1854EXPORT_SYMBOL_GPL(usbnet_resume); 1855 1856/* 1857 * Either a subdriver implements manage_power, then it is assumed to always 1858 * be ready to be suspended or it reports the readiness to be suspended 1859 * explicitly 1860 */ 1861void usbnet_device_suggests_idle(struct usbnet *dev) 1862{ 1863 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) { 1864 dev->intf->needs_remote_wakeup = 1; 1865 usb_autopm_put_interface_async(dev->intf); 1866 } 1867} 1868EXPORT_SYMBOL(usbnet_device_suggests_idle); 1869 1870/* 1871 * For devices that can do without special commands 1872 */ 1873int usbnet_manage_power(struct usbnet *dev, int on) 1874{ 1875 dev->intf->needs_remote_wakeup = on; 1876 return 0; 1877} 1878EXPORT_SYMBOL(usbnet_manage_power); 1879 1880void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset) 1881{ 1882 /* update link after link is reseted */ 1883 if (link && !need_reset) 1884 netif_carrier_on(dev->net); 1885 else 1886 netif_carrier_off(dev->net); 1887 1888 if (need_reset && link) 1889 usbnet_defer_kevent(dev, EVENT_LINK_RESET); 1890 else 1891 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE); 1892} 1893EXPORT_SYMBOL(usbnet_link_change); 1894 1895/*-------------------------------------------------------------------------*/ 1896static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1897 u16 value, u16 index, void *data, u16 size) 1898{ 1899 void *buf = NULL; 1900 int err = -ENOMEM; 1901 1902 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x" 1903 " value=0x%04x index=0x%04x size=%d\n", 1904 cmd, reqtype, value, index, size); 1905 1906 if (data) { 1907 buf = kmalloc(size, GFP_KERNEL); 1908 if (!buf) 1909 goto out; 1910 } 1911 1912 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), 1913 cmd, reqtype, value, index, buf, size, 1914 USB_CTRL_GET_TIMEOUT); 1915 if (err > 0 && err <= size) 1916 memcpy(data, buf, err); 1917 kfree(buf); 1918out: 1919 return err; 1920} 1921 1922static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1923 u16 value, u16 index, const void *data, 1924 u16 size) 1925{ 1926 void *buf = NULL; 1927 int err = -ENOMEM; 1928 1929 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 1930 " value=0x%04x index=0x%04x size=%d\n", 1931 cmd, reqtype, value, index, size); 1932 1933 if (data) { 1934 buf = kmemdup(data, size, GFP_KERNEL); 1935 if (!buf) 1936 goto out; 1937 } 1938 1939 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), 1940 cmd, reqtype, value, index, buf, size, 1941 USB_CTRL_SET_TIMEOUT); 1942 kfree(buf); 1943 1944out: 1945 return err; 1946} 1947 1948/* 1949 * The function can't be called inside suspend/resume callback, 1950 * otherwise deadlock will be caused. 1951 */ 1952int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1953 u16 value, u16 index, void *data, u16 size) 1954{ 1955 int ret; 1956 1957 if (usb_autopm_get_interface(dev->intf) < 0) 1958 return -ENODEV; 1959 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index, 1960 data, size); 1961 usb_autopm_put_interface(dev->intf); 1962 return ret; 1963} 1964EXPORT_SYMBOL_GPL(usbnet_read_cmd); 1965 1966/* 1967 * The function can't be called inside suspend/resume callback, 1968 * otherwise deadlock will be caused. 1969 */ 1970int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1971 u16 value, u16 index, const void *data, u16 size) 1972{ 1973 int ret; 1974 1975 if (usb_autopm_get_interface(dev->intf) < 0) 1976 return -ENODEV; 1977 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index, 1978 data, size); 1979 usb_autopm_put_interface(dev->intf); 1980 return ret; 1981} 1982EXPORT_SYMBOL_GPL(usbnet_write_cmd); 1983 1984/* 1985 * The function can be called inside suspend/resume callback safely 1986 * and should only be called by suspend/resume callback generally. 1987 */ 1988int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 1989 u16 value, u16 index, void *data, u16 size) 1990{ 1991 return __usbnet_read_cmd(dev, cmd, reqtype, value, index, 1992 data, size); 1993} 1994EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm); 1995 1996/* 1997 * The function can be called inside suspend/resume callback safely 1998 * and should only be called by suspend/resume callback generally. 1999 */ 2000int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 2001 u16 value, u16 index, const void *data, 2002 u16 size) 2003{ 2004 return __usbnet_write_cmd(dev, cmd, reqtype, value, index, 2005 data, size); 2006} 2007EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm); 2008 2009static void usbnet_async_cmd_cb(struct urb *urb) 2010{ 2011 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context; 2012 int status = urb->status; 2013 2014 if (status < 0) 2015 dev_dbg(&urb->dev->dev, "%s failed with %d", 2016 __func__, status); 2017 2018 kfree(req); 2019 usb_free_urb(urb); 2020} 2021 2022/* 2023 * The caller must make sure that device can't be put into suspend 2024 * state until the control URB completes. 2025 */ 2026int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype, 2027 u16 value, u16 index, const void *data, u16 size) 2028{ 2029 struct usb_ctrlrequest *req = NULL; 2030 struct urb *urb; 2031 int err = -ENOMEM; 2032 void *buf = NULL; 2033 2034 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 2035 " value=0x%04x index=0x%04x size=%d\n", 2036 cmd, reqtype, value, index, size); 2037 2038 urb = usb_alloc_urb(0, GFP_ATOMIC); 2039 if (!urb) { 2040 netdev_err(dev->net, "Error allocating URB in" 2041 " %s!\n", __func__); 2042 goto fail; 2043 } 2044 2045 if (data) { 2046 buf = kmemdup(data, size, GFP_ATOMIC); 2047 if (!buf) { 2048 netdev_err(dev->net, "Error allocating buffer" 2049 " in %s!\n", __func__); 2050 goto fail_free; 2051 } 2052 } 2053 2054 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC); 2055 if (!req) 2056 goto fail_free_buf; 2057 2058 req->bRequestType = reqtype; 2059 req->bRequest = cmd; 2060 req->wValue = cpu_to_le16(value); 2061 req->wIndex = cpu_to_le16(index); 2062 req->wLength = cpu_to_le16(size); 2063 2064 usb_fill_control_urb(urb, dev->udev, 2065 usb_sndctrlpipe(dev->udev, 0), 2066 (void *)req, buf, size, 2067 usbnet_async_cmd_cb, req); 2068 urb->transfer_flags |= URB_FREE_BUFFER; 2069 2070 err = usb_submit_urb(urb, GFP_ATOMIC); 2071 if (err < 0) { 2072 netdev_err(dev->net, "Error submitting the control" 2073 " message: status=%d\n", err); 2074 goto fail_free; 2075 } 2076 return 0; 2077 2078fail_free_buf: 2079 kfree(buf); 2080fail_free: 2081 kfree(req); 2082 usb_free_urb(urb); 2083fail: 2084 return err; 2085 2086} 2087EXPORT_SYMBOL_GPL(usbnet_write_cmd_async); 2088/*-------------------------------------------------------------------------*/ 2089 2090static int __init usbnet_init(void) 2091{ 2092 /* Compiler should optimize this out. */ 2093 BUILD_BUG_ON( 2094 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data)); 2095 2096 eth_random_addr(node_id); 2097 return 0; 2098} 2099module_init(usbnet_init); 2100 2101static void __exit usbnet_exit(void) 2102{ 2103} 2104module_exit(usbnet_exit); 2105 2106MODULE_AUTHOR("David Brownell"); 2107MODULE_DESCRIPTION("USB network driver framework"); 2108MODULE_LICENSE("GPL"); 2109