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 83 static u8 node_id [ETH_ALEN]; 84 85 static const char driver_name [] = "usbnet"; 86 87 /* use ethtool to change the level for any given device */ 88 static int msg_level = -1; 89 module_param (msg_level, int, 0); 90 MODULE_PARM_DESC (msg_level, "Override default message level"); 91 92 /*-------------------------------------------------------------------------*/ 93 94 /* handles CDC Ethernet and many other network "bulk data" interfaces */ 95 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf) 96 { 97 int tmp; 98 struct usb_host_interface *alt = NULL; 99 struct usb_host_endpoint *in = NULL, *out = NULL; 100 struct usb_host_endpoint *status = NULL; 101 102 for (tmp = 0; tmp < intf->num_altsetting; tmp++) { 103 unsigned ep; 104 105 in = out = status = NULL; 106 alt = intf->altsetting + tmp; 107 108 /* take the first altsetting with in-bulk + out-bulk; 109 * remember any status endpoint, just in case; 110 * ignore other endpoints and altsettings. 111 */ 112 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) { 113 struct usb_host_endpoint *e; 114 int intr = 0; 115 116 e = alt->endpoint + ep; 117 switch (e->desc.bmAttributes) { 118 case USB_ENDPOINT_XFER_INT: 119 if (!usb_endpoint_dir_in(&e->desc)) 120 continue; 121 intr = 1; 122 /* FALLTHROUGH */ 123 case USB_ENDPOINT_XFER_BULK: 124 break; 125 default: 126 continue; 127 } 128 if (usb_endpoint_dir_in(&e->desc)) { 129 if (!intr && !in) 130 in = e; 131 else if (intr && !status) 132 status = e; 133 } else { 134 if (!out) 135 out = e; 136 } 137 } 138 if (in && out) 139 break; 140 } 141 if (!alt || !in || !out) 142 return -EINVAL; 143 144 if (alt->desc.bAlternateSetting != 0 || 145 !(dev->driver_info->flags & FLAG_NO_SETINT)) { 146 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber, 147 alt->desc.bAlternateSetting); 148 if (tmp < 0) 149 return tmp; 150 } 151 152 dev->in = usb_rcvbulkpipe (dev->udev, 153 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 154 dev->out = usb_sndbulkpipe (dev->udev, 155 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 156 dev->status = status; 157 return 0; 158 } 159 EXPORT_SYMBOL_GPL(usbnet_get_endpoints); 160 161 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress) 162 { 163 int tmp = -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 } 178 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr); 179 180 static void intr_complete (struct urb *urb) 181 { 182 struct usbnet *dev = urb->context; 183 int status = urb->status; 184 185 switch (status) { 186 /* success */ 187 case 0: 188 dev->driver_info->status(dev, urb); 189 break; 190 191 /* software-driven interface shutdown */ 192 case -ENOENT: /* urb killed */ 193 case -ESHUTDOWN: /* hardware gone */ 194 netif_dbg(dev, ifdown, dev->net, 195 "intr shutdown, code %d\n", status); 196 return; 197 198 /* NOTE: not throttling like RX/TX, since this endpoint 199 * already polls infrequently 200 */ 201 default: 202 netdev_dbg(dev->net, "intr status %d\n", status); 203 break; 204 } 205 206 status = usb_submit_urb (urb, GFP_ATOMIC); 207 if (status != 0) 208 netif_err(dev, timer, dev->net, 209 "intr resubmit --> %d\n", status); 210 } 211 212 static int init_status (struct usbnet *dev, struct usb_interface *intf) 213 { 214 char *buf = NULL; 215 unsigned pipe = 0; 216 unsigned maxp; 217 unsigned period; 218 219 if (!dev->driver_info->status) 220 return 0; 221 222 pipe = usb_rcvintpipe (dev->udev, 223 dev->status->desc.bEndpointAddress 224 & USB_ENDPOINT_NUMBER_MASK); 225 maxp = usb_maxpacket (dev->udev, pipe, 0); 226 227 /* avoid 1 msec chatter: min 8 msec poll rate */ 228 period = max ((int) dev->status->desc.bInterval, 229 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3); 230 231 buf = kmalloc (maxp, GFP_KERNEL); 232 if (buf) { 233 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL); 234 if (!dev->interrupt) { 235 kfree (buf); 236 return -ENOMEM; 237 } else { 238 usb_fill_int_urb(dev->interrupt, dev->udev, pipe, 239 buf, maxp, intr_complete, dev, period); 240 dev->interrupt->transfer_flags |= URB_FREE_BUFFER; 241 dev_dbg(&intf->dev, 242 "status ep%din, %d bytes period %d\n", 243 usb_pipeendpoint(pipe), maxp, period); 244 } 245 } 246 return 0; 247 } 248 249 /* Submit the interrupt URB if not previously submitted, increasing refcount */ 250 int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags) 251 { 252 int ret = 0; 253 254 WARN_ON_ONCE(dev->interrupt == NULL); 255 if (dev->interrupt) { 256 mutex_lock(&dev->interrupt_mutex); 257 258 if (++dev->interrupt_count == 1) 259 ret = usb_submit_urb(dev->interrupt, mem_flags); 260 261 dev_dbg(&dev->udev->dev, "incremented interrupt URB count to %d\n", 262 dev->interrupt_count); 263 mutex_unlock(&dev->interrupt_mutex); 264 } 265 return ret; 266 } 267 EXPORT_SYMBOL_GPL(usbnet_status_start); 268 269 /* For resume; submit interrupt URB if previously submitted */ 270 static int __usbnet_status_start_force(struct usbnet *dev, gfp_t mem_flags) 271 { 272 int ret = 0; 273 274 mutex_lock(&dev->interrupt_mutex); 275 if (dev->interrupt_count) { 276 ret = usb_submit_urb(dev->interrupt, mem_flags); 277 dev_dbg(&dev->udev->dev, 278 "submitted interrupt URB for resume\n"); 279 } 280 mutex_unlock(&dev->interrupt_mutex); 281 return ret; 282 } 283 284 /* Kill the interrupt URB if all submitters want it killed */ 285 void usbnet_status_stop(struct usbnet *dev) 286 { 287 if (dev->interrupt) { 288 mutex_lock(&dev->interrupt_mutex); 289 WARN_ON(dev->interrupt_count == 0); 290 291 if (dev->interrupt_count && --dev->interrupt_count == 0) 292 usb_kill_urb(dev->interrupt); 293 294 dev_dbg(&dev->udev->dev, 295 "decremented interrupt URB count to %d\n", 296 dev->interrupt_count); 297 mutex_unlock(&dev->interrupt_mutex); 298 } 299 } 300 EXPORT_SYMBOL_GPL(usbnet_status_stop); 301 302 /* For suspend; always kill interrupt URB */ 303 static void __usbnet_status_stop_force(struct usbnet *dev) 304 { 305 if (dev->interrupt) { 306 mutex_lock(&dev->interrupt_mutex); 307 usb_kill_urb(dev->interrupt); 308 dev_dbg(&dev->udev->dev, "killed interrupt URB for suspend\n"); 309 mutex_unlock(&dev->interrupt_mutex); 310 } 311 } 312 313 /* Passes this packet up the stack, updating its accounting. 314 * Some link protocols batch packets, so their rx_fixup paths 315 * can return clones as well as just modify the original skb. 316 */ 317 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb) 318 { 319 int status; 320 321 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) { 322 skb_queue_tail(&dev->rxq_pause, skb); 323 return; 324 } 325 326 skb->protocol = eth_type_trans (skb, dev->net); 327 dev->net->stats.rx_packets++; 328 dev->net->stats.rx_bytes += skb->len; 329 330 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n", 331 skb->len + sizeof (struct ethhdr), skb->protocol); 332 memset (skb->cb, 0, sizeof (struct skb_data)); 333 334 if (skb_defer_rx_timestamp(skb)) 335 return; 336 337 status = netif_rx (skb); 338 if (status != NET_RX_SUCCESS) 339 netif_dbg(dev, rx_err, dev->net, 340 "netif_rx status %d\n", status); 341 } 342 EXPORT_SYMBOL_GPL(usbnet_skb_return); 343 344 /* must be called if hard_mtu or rx_urb_size changed */ 345 void usbnet_update_max_qlen(struct usbnet *dev) 346 { 347 enum usb_device_speed speed = dev->udev->speed; 348 349 switch (speed) { 350 case USB_SPEED_HIGH: 351 dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size; 352 dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu; 353 break; 354 case USB_SPEED_SUPER: 355 /* 356 * Not take default 5ms qlen for super speed HC to 357 * save memory, and iperf tests show 2.5ms qlen can 358 * work well 359 */ 360 dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size; 361 dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu; 362 break; 363 default: 364 dev->rx_qlen = dev->tx_qlen = 4; 365 } 366 } 367 EXPORT_SYMBOL_GPL(usbnet_update_max_qlen); 368 369 370 /*------------------------------------------------------------------------- 371 * 372 * Network Device Driver (peer link to "Host Device", from USB host) 373 * 374 *-------------------------------------------------------------------------*/ 375 376 int usbnet_change_mtu (struct net_device *net, int new_mtu) 377 { 378 struct usbnet *dev = netdev_priv(net); 379 int ll_mtu = new_mtu + net->hard_header_len; 380 int old_hard_mtu = dev->hard_mtu; 381 int old_rx_urb_size = dev->rx_urb_size; 382 383 if (new_mtu <= 0) 384 return -EINVAL; 385 // no second zero-length packet read wanted after mtu-sized packets 386 if ((ll_mtu % dev->maxpacket) == 0) 387 return -EDOM; 388 net->mtu = new_mtu; 389 390 dev->hard_mtu = net->mtu + net->hard_header_len; 391 if (dev->rx_urb_size == old_hard_mtu) { 392 dev->rx_urb_size = dev->hard_mtu; 393 if (dev->rx_urb_size > old_rx_urb_size) 394 usbnet_unlink_rx_urbs(dev); 395 } 396 397 /* max qlen depend on hard_mtu and rx_urb_size */ 398 usbnet_update_max_qlen(dev); 399 400 return 0; 401 } 402 EXPORT_SYMBOL_GPL(usbnet_change_mtu); 403 404 /* The caller must hold list->lock */ 405 static void __usbnet_queue_skb(struct sk_buff_head *list, 406 struct sk_buff *newsk, enum skb_state state) 407 { 408 struct skb_data *entry = (struct skb_data *) newsk->cb; 409 410 __skb_queue_tail(list, newsk); 411 entry->state = state; 412 } 413 414 /*-------------------------------------------------------------------------*/ 415 416 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from 417 * completion callbacks. 2.5 should have fixed those bugs... 418 */ 419 420 static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb, 421 struct sk_buff_head *list, enum skb_state state) 422 { 423 unsigned long flags; 424 enum skb_state old_state; 425 struct skb_data *entry = (struct skb_data *) skb->cb; 426 427 spin_lock_irqsave(&list->lock, flags); 428 old_state = entry->state; 429 entry->state = state; 430 __skb_unlink(skb, list); 431 432 /* defer_bh() is never called with list == &dev->done. 433 * spin_lock_nested() tells lockdep that it is OK to take 434 * dev->done.lock here with list->lock held. 435 */ 436 spin_lock_nested(&dev->done.lock, SINGLE_DEPTH_NESTING); 437 438 __skb_queue_tail(&dev->done, skb); 439 if (dev->done.qlen == 1) 440 tasklet_schedule(&dev->bh); 441 spin_unlock(&dev->done.lock); 442 spin_unlock_irqrestore(&list->lock, flags); 443 return old_state; 444 } 445 446 /* some work can't be done in tasklets, so we use keventd 447 * 448 * NOTE: annoying asymmetry: if it's active, schedule_work() fails, 449 * but tasklet_schedule() doesn't. hope the failure is rare. 450 */ 451 void usbnet_defer_kevent (struct usbnet *dev, int work) 452 { 453 set_bit (work, &dev->flags); 454 if (!schedule_work (&dev->kevent)) { 455 if (net_ratelimit()) 456 netdev_err(dev->net, "kevent %d may have been dropped\n", work); 457 } else { 458 netdev_dbg(dev->net, "kevent %d scheduled\n", work); 459 } 460 } 461 EXPORT_SYMBOL_GPL(usbnet_defer_kevent); 462 463 /*-------------------------------------------------------------------------*/ 464 465 static void rx_complete (struct urb *urb); 466 467 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) 468 { 469 struct sk_buff *skb; 470 struct skb_data *entry; 471 int retval = 0; 472 unsigned long lockflags; 473 size_t size = dev->rx_urb_size; 474 475 /* prevent rx skb allocation when error ratio is high */ 476 if (test_bit(EVENT_RX_KILL, &dev->flags)) { 477 usb_free_urb(urb); 478 return -ENOLINK; 479 } 480 481 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags); 482 if (!skb) { 483 netif_dbg(dev, rx_err, dev->net, "no rx skb\n"); 484 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 485 usb_free_urb (urb); 486 return -ENOMEM; 487 } 488 489 entry = (struct skb_data *) skb->cb; 490 entry->urb = urb; 491 entry->dev = dev; 492 entry->length = 0; 493 494 usb_fill_bulk_urb (urb, dev->udev, dev->in, 495 skb->data, size, rx_complete, skb); 496 497 spin_lock_irqsave (&dev->rxq.lock, lockflags); 498 499 if (netif_running (dev->net) && 500 netif_device_present (dev->net) && 501 !test_bit (EVENT_RX_HALT, &dev->flags) && 502 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) { 503 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) { 504 case -EPIPE: 505 usbnet_defer_kevent (dev, EVENT_RX_HALT); 506 break; 507 case -ENOMEM: 508 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 509 break; 510 case -ENODEV: 511 netif_dbg(dev, ifdown, dev->net, "device gone\n"); 512 netif_device_detach (dev->net); 513 break; 514 case -EHOSTUNREACH: 515 retval = -ENOLINK; 516 break; 517 default: 518 netif_dbg(dev, rx_err, dev->net, 519 "rx submit, %d\n", retval); 520 tasklet_schedule (&dev->bh); 521 break; 522 case 0: 523 __usbnet_queue_skb(&dev->rxq, skb, rx_start); 524 } 525 } else { 526 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n"); 527 retval = -ENOLINK; 528 } 529 spin_unlock_irqrestore (&dev->rxq.lock, lockflags); 530 if (retval) { 531 dev_kfree_skb_any (skb); 532 usb_free_urb (urb); 533 } 534 return retval; 535 } 536 537 538 /*-------------------------------------------------------------------------*/ 539 540 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb) 541 { 542 if (dev->driver_info->rx_fixup && 543 !dev->driver_info->rx_fixup (dev, skb)) { 544 /* With RX_ASSEMBLE, rx_fixup() must update counters */ 545 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE)) 546 dev->net->stats.rx_errors++; 547 goto done; 548 } 549 // else network stack removes extra byte if we forced a short packet 550 551 /* all data was already cloned from skb inside the driver */ 552 if (dev->driver_info->flags & FLAG_MULTI_PACKET) 553 goto done; 554 555 if (skb->len < ETH_HLEN) { 556 dev->net->stats.rx_errors++; 557 dev->net->stats.rx_length_errors++; 558 netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len); 559 } else { 560 usbnet_skb_return(dev, skb); 561 return; 562 } 563 564 done: 565 skb_queue_tail(&dev->done, skb); 566 } 567 568 /*-------------------------------------------------------------------------*/ 569 570 static void rx_complete (struct urb *urb) 571 { 572 struct sk_buff *skb = (struct sk_buff *) urb->context; 573 struct skb_data *entry = (struct skb_data *) skb->cb; 574 struct usbnet *dev = entry->dev; 575 int urb_status = urb->status; 576 enum skb_state state; 577 578 skb_put (skb, urb->actual_length); 579 state = rx_done; 580 entry->urb = NULL; 581 582 switch (urb_status) { 583 /* success */ 584 case 0: 585 break; 586 587 /* stalls need manual reset. this is rare ... except that 588 * when going through USB 2.0 TTs, unplug appears this way. 589 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ 590 * storm, recovering as needed. 591 */ 592 case -EPIPE: 593 dev->net->stats.rx_errors++; 594 usbnet_defer_kevent (dev, EVENT_RX_HALT); 595 // FALLTHROUGH 596 597 /* software-driven interface shutdown */ 598 case -ECONNRESET: /* async unlink */ 599 case -ESHUTDOWN: /* hardware gone */ 600 netif_dbg(dev, ifdown, dev->net, 601 "rx shutdown, code %d\n", urb_status); 602 goto block; 603 604 /* we get controller i/o faults during hub_wq disconnect() delays. 605 * throttle down resubmits, to avoid log floods; just temporarily, 606 * so we still recover when the fault isn't a hub_wq delay. 607 */ 608 case -EPROTO: 609 case -ETIME: 610 case -EILSEQ: 611 dev->net->stats.rx_errors++; 612 if (!timer_pending (&dev->delay)) { 613 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); 614 netif_dbg(dev, link, dev->net, 615 "rx throttle %d\n", urb_status); 616 } 617 block: 618 state = rx_cleanup; 619 entry->urb = urb; 620 urb = NULL; 621 break; 622 623 /* data overrun ... flush fifo? */ 624 case -EOVERFLOW: 625 dev->net->stats.rx_over_errors++; 626 // FALLTHROUGH 627 628 default: 629 state = rx_cleanup; 630 dev->net->stats.rx_errors++; 631 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status); 632 break; 633 } 634 635 /* stop rx if packet error rate is high */ 636 if (++dev->pkt_cnt > 30) { 637 dev->pkt_cnt = 0; 638 dev->pkt_err = 0; 639 } else { 640 if (state == rx_cleanup) 641 dev->pkt_err++; 642 if (dev->pkt_err > 20) 643 set_bit(EVENT_RX_KILL, &dev->flags); 644 } 645 646 state = defer_bh(dev, skb, &dev->rxq, state); 647 648 if (urb) { 649 if (netif_running (dev->net) && 650 !test_bit (EVENT_RX_HALT, &dev->flags) && 651 state != unlink_start) { 652 rx_submit (dev, urb, GFP_ATOMIC); 653 usb_mark_last_busy(dev->udev); 654 return; 655 } 656 usb_free_urb (urb); 657 } 658 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n"); 659 } 660 661 /*-------------------------------------------------------------------------*/ 662 void usbnet_pause_rx(struct usbnet *dev) 663 { 664 set_bit(EVENT_RX_PAUSED, &dev->flags); 665 666 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n"); 667 } 668 EXPORT_SYMBOL_GPL(usbnet_pause_rx); 669 670 void usbnet_resume_rx(struct usbnet *dev) 671 { 672 struct sk_buff *skb; 673 int num = 0; 674 675 clear_bit(EVENT_RX_PAUSED, &dev->flags); 676 677 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) { 678 usbnet_skb_return(dev, skb); 679 num++; 680 } 681 682 tasklet_schedule(&dev->bh); 683 684 netif_dbg(dev, rx_status, dev->net, 685 "paused rx queue disabled, %d skbs requeued\n", num); 686 } 687 EXPORT_SYMBOL_GPL(usbnet_resume_rx); 688 689 void usbnet_purge_paused_rxq(struct usbnet *dev) 690 { 691 skb_queue_purge(&dev->rxq_pause); 692 } 693 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq); 694 695 /*-------------------------------------------------------------------------*/ 696 697 // unlink pending rx/tx; completion handlers do all other cleanup 698 699 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) 700 { 701 unsigned long flags; 702 struct sk_buff *skb; 703 int count = 0; 704 705 spin_lock_irqsave (&q->lock, flags); 706 while (!skb_queue_empty(q)) { 707 struct skb_data *entry; 708 struct urb *urb; 709 int retval; 710 711 skb_queue_walk(q, skb) { 712 entry = (struct skb_data *) skb->cb; 713 if (entry->state != unlink_start) 714 goto found; 715 } 716 break; 717 found: 718 entry->state = unlink_start; 719 urb = entry->urb; 720 721 /* 722 * Get reference count of the URB to avoid it to be 723 * freed during usb_unlink_urb, which may trigger 724 * use-after-free problem inside usb_unlink_urb since 725 * usb_unlink_urb is always racing with .complete 726 * handler(include defer_bh). 727 */ 728 usb_get_urb(urb); 729 spin_unlock_irqrestore(&q->lock, flags); 730 // during some PM-driven resume scenarios, 731 // these (async) unlinks complete immediately 732 retval = usb_unlink_urb (urb); 733 if (retval != -EINPROGRESS && retval != 0) 734 netdev_dbg(dev->net, "unlink urb err, %d\n", retval); 735 else 736 count++; 737 usb_put_urb(urb); 738 spin_lock_irqsave(&q->lock, flags); 739 } 740 spin_unlock_irqrestore (&q->lock, flags); 741 return count; 742 } 743 744 // Flush all pending rx urbs 745 // minidrivers may need to do this when the MTU changes 746 747 void usbnet_unlink_rx_urbs(struct usbnet *dev) 748 { 749 if (netif_running(dev->net)) { 750 (void) unlink_urbs (dev, &dev->rxq); 751 tasklet_schedule(&dev->bh); 752 } 753 } 754 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); 755 756 /*-------------------------------------------------------------------------*/ 757 758 static void wait_skb_queue_empty(struct sk_buff_head *q) 759 { 760 unsigned long flags; 761 762 spin_lock_irqsave(&q->lock, flags); 763 while (!skb_queue_empty(q)) { 764 spin_unlock_irqrestore(&q->lock, flags); 765 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS)); 766 set_current_state(TASK_UNINTERRUPTIBLE); 767 spin_lock_irqsave(&q->lock, flags); 768 } 769 spin_unlock_irqrestore(&q->lock, flags); 770 } 771 772 // precondition: never called in_interrupt 773 static void usbnet_terminate_urbs(struct usbnet *dev) 774 { 775 DECLARE_WAITQUEUE(wait, current); 776 int temp; 777 778 /* ensure there are no more active urbs */ 779 add_wait_queue(&dev->wait, &wait); 780 set_current_state(TASK_UNINTERRUPTIBLE); 781 temp = unlink_urbs(dev, &dev->txq) + 782 unlink_urbs(dev, &dev->rxq); 783 784 /* maybe wait for deletions to finish. */ 785 wait_skb_queue_empty(&dev->rxq); 786 wait_skb_queue_empty(&dev->txq); 787 wait_skb_queue_empty(&dev->done); 788 netif_dbg(dev, ifdown, dev->net, 789 "waited for %d urb completions\n", temp); 790 set_current_state(TASK_RUNNING); 791 remove_wait_queue(&dev->wait, &wait); 792 } 793 794 int usbnet_stop (struct net_device *net) 795 { 796 struct usbnet *dev = netdev_priv(net); 797 struct driver_info *info = dev->driver_info; 798 int retval, pm, mpn; 799 800 clear_bit(EVENT_DEV_OPEN, &dev->flags); 801 netif_stop_queue (net); 802 803 netif_info(dev, ifdown, dev->net, 804 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n", 805 net->stats.rx_packets, net->stats.tx_packets, 806 net->stats.rx_errors, net->stats.tx_errors); 807 808 /* to not race resume */ 809 pm = usb_autopm_get_interface(dev->intf); 810 /* allow minidriver to stop correctly (wireless devices to turn off 811 * radio etc) */ 812 if (info->stop) { 813 retval = info->stop(dev); 814 if (retval < 0) 815 netif_info(dev, ifdown, dev->net, 816 "stop fail (%d) usbnet usb-%s-%s, %s\n", 817 retval, 818 dev->udev->bus->bus_name, dev->udev->devpath, 819 info->description); 820 } 821 822 if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) 823 usbnet_terminate_urbs(dev); 824 825 usbnet_status_stop(dev); 826 827 usbnet_purge_paused_rxq(dev); 828 829 mpn = !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags); 830 831 /* deferred work (task, timer, softirq) must also stop. 832 * can't flush_scheduled_work() until we drop rtnl (later), 833 * else workers could deadlock; so make workers a NOP. 834 */ 835 dev->flags = 0; 836 del_timer_sync (&dev->delay); 837 tasklet_kill (&dev->bh); 838 if (!pm) 839 usb_autopm_put_interface(dev->intf); 840 841 if (info->manage_power && mpn) 842 info->manage_power(dev, 0); 843 else 844 usb_autopm_put_interface(dev->intf); 845 846 return 0; 847 } 848 EXPORT_SYMBOL_GPL(usbnet_stop); 849 850 /*-------------------------------------------------------------------------*/ 851 852 // posts reads, and enables write queuing 853 854 // precondition: never called in_interrupt 855 856 int usbnet_open (struct net_device *net) 857 { 858 struct usbnet *dev = netdev_priv(net); 859 int retval; 860 struct driver_info *info = dev->driver_info; 861 862 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { 863 netif_info(dev, ifup, dev->net, 864 "resumption fail (%d) usbnet usb-%s-%s, %s\n", 865 retval, 866 dev->udev->bus->bus_name, 867 dev->udev->devpath, 868 info->description); 869 goto done_nopm; 870 } 871 872 // put into "known safe" state 873 if (info->reset && (retval = info->reset (dev)) < 0) { 874 netif_info(dev, ifup, dev->net, 875 "open reset fail (%d) usbnet usb-%s-%s, %s\n", 876 retval, 877 dev->udev->bus->bus_name, 878 dev->udev->devpath, 879 info->description); 880 goto done; 881 } 882 883 /* hard_mtu or rx_urb_size may change in reset() */ 884 usbnet_update_max_qlen(dev); 885 886 // insist peer be connected 887 if (info->check_connect && (retval = info->check_connect (dev)) < 0) { 888 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval); 889 goto done; 890 } 891 892 /* start any status interrupt transfer */ 893 if (dev->interrupt) { 894 retval = usbnet_status_start(dev, GFP_KERNEL); 895 if (retval < 0) { 896 netif_err(dev, ifup, dev->net, 897 "intr submit %d\n", retval); 898 goto done; 899 } 900 } 901 902 set_bit(EVENT_DEV_OPEN, &dev->flags); 903 netif_start_queue (net); 904 netif_info(dev, ifup, dev->net, 905 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n", 906 (int)RX_QLEN(dev), (int)TX_QLEN(dev), 907 dev->net->mtu, 908 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" : 909 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" : 910 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" : 911 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" : 912 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" : 913 "simple"); 914 915 /* reset rx error state */ 916 dev->pkt_cnt = 0; 917 dev->pkt_err = 0; 918 clear_bit(EVENT_RX_KILL, &dev->flags); 919 920 // delay posting reads until we're fully open 921 tasklet_schedule (&dev->bh); 922 if (info->manage_power) { 923 retval = info->manage_power(dev, 1); 924 if (retval < 0) { 925 retval = 0; 926 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags); 927 } else { 928 usb_autopm_put_interface(dev->intf); 929 } 930 } 931 return retval; 932 done: 933 usb_autopm_put_interface(dev->intf); 934 done_nopm: 935 return retval; 936 } 937 EXPORT_SYMBOL_GPL(usbnet_open); 938 939 /*-------------------------------------------------------------------------*/ 940 941 /* ethtool methods; minidrivers may need to add some more, but 942 * they'll probably want to use this base set. 943 */ 944 945 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd) 946 { 947 struct usbnet *dev = netdev_priv(net); 948 949 if (!dev->mii.mdio_read) 950 return -EOPNOTSUPP; 951 952 return mii_ethtool_gset(&dev->mii, cmd); 953 } 954 EXPORT_SYMBOL_GPL(usbnet_get_settings); 955 956 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd) 957 { 958 struct usbnet *dev = netdev_priv(net); 959 int retval; 960 961 if (!dev->mii.mdio_write) 962 return -EOPNOTSUPP; 963 964 retval = mii_ethtool_sset(&dev->mii, cmd); 965 966 /* link speed/duplex might have changed */ 967 if (dev->driver_info->link_reset) 968 dev->driver_info->link_reset(dev); 969 970 /* hard_mtu or rx_urb_size may change in link_reset() */ 971 usbnet_update_max_qlen(dev); 972 973 return retval; 974 975 } 976 EXPORT_SYMBOL_GPL(usbnet_set_settings); 977 978 u32 usbnet_get_link (struct net_device *net) 979 { 980 struct usbnet *dev = netdev_priv(net); 981 982 /* If a check_connect is defined, return its result */ 983 if (dev->driver_info->check_connect) 984 return dev->driver_info->check_connect (dev) == 0; 985 986 /* if the device has mii operations, use those */ 987 if (dev->mii.mdio_read) 988 return mii_link_ok(&dev->mii); 989 990 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ 991 return ethtool_op_get_link(net); 992 } 993 EXPORT_SYMBOL_GPL(usbnet_get_link); 994 995 int usbnet_nway_reset(struct net_device *net) 996 { 997 struct usbnet *dev = netdev_priv(net); 998 999 if (!dev->mii.mdio_write) 1000 return -EOPNOTSUPP; 1001 1002 return mii_nway_restart(&dev->mii); 1003 } 1004 EXPORT_SYMBOL_GPL(usbnet_nway_reset); 1005 1006 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) 1007 { 1008 struct usbnet *dev = netdev_priv(net); 1009 1010 strlcpy (info->driver, dev->driver_name, sizeof info->driver); 1011 strlcpy (info->version, DRIVER_VERSION, sizeof info->version); 1012 strlcpy (info->fw_version, dev->driver_info->description, 1013 sizeof info->fw_version); 1014 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); 1015 } 1016 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); 1017 1018 u32 usbnet_get_msglevel (struct net_device *net) 1019 { 1020 struct usbnet *dev = netdev_priv(net); 1021 1022 return dev->msg_enable; 1023 } 1024 EXPORT_SYMBOL_GPL(usbnet_get_msglevel); 1025 1026 void usbnet_set_msglevel (struct net_device *net, u32 level) 1027 { 1028 struct usbnet *dev = netdev_priv(net); 1029 1030 dev->msg_enable = level; 1031 } 1032 EXPORT_SYMBOL_GPL(usbnet_set_msglevel); 1033 1034 /* drivers may override default ethtool_ops in their bind() routine */ 1035 static const struct ethtool_ops usbnet_ethtool_ops = { 1036 .get_settings = usbnet_get_settings, 1037 .set_settings = usbnet_set_settings, 1038 .get_link = usbnet_get_link, 1039 .nway_reset = usbnet_nway_reset, 1040 .get_drvinfo = usbnet_get_drvinfo, 1041 .get_msglevel = usbnet_get_msglevel, 1042 .set_msglevel = usbnet_set_msglevel, 1043 .get_ts_info = ethtool_op_get_ts_info, 1044 }; 1045 1046 /*-------------------------------------------------------------------------*/ 1047 1048 static void __handle_link_change(struct usbnet *dev) 1049 { 1050 if (!test_bit(EVENT_DEV_OPEN, &dev->flags)) 1051 return; 1052 1053 if (!netif_carrier_ok(dev->net)) { 1054 /* kill URBs for reading packets to save bus bandwidth */ 1055 unlink_urbs(dev, &dev->rxq); 1056 1057 /* 1058 * tx_timeout will unlink URBs for sending packets and 1059 * tx queue is stopped by netcore after link becomes off 1060 */ 1061 } else { 1062 /* submitting URBs for reading packets */ 1063 tasklet_schedule(&dev->bh); 1064 } 1065 1066 /* hard_mtu or rx_urb_size may change during link change */ 1067 usbnet_update_max_qlen(dev); 1068 1069 clear_bit(EVENT_LINK_CHANGE, &dev->flags); 1070 } 1071 1072 static void usbnet_set_rx_mode(struct net_device *net) 1073 { 1074 struct usbnet *dev = netdev_priv(net); 1075 1076 usbnet_defer_kevent(dev, EVENT_SET_RX_MODE); 1077 } 1078 1079 static void __handle_set_rx_mode(struct usbnet *dev) 1080 { 1081 if (dev->driver_info->set_rx_mode) 1082 (dev->driver_info->set_rx_mode)(dev); 1083 1084 clear_bit(EVENT_SET_RX_MODE, &dev->flags); 1085 } 1086 1087 /* work that cannot be done in interrupt context uses keventd. 1088 * 1089 * NOTE: with 2.5 we could do more of this using completion callbacks, 1090 * especially now that control transfers can be queued. 1091 */ 1092 static void 1093 usbnet_deferred_kevent (struct work_struct *work) 1094 { 1095 struct usbnet *dev = 1096 container_of(work, struct usbnet, kevent); 1097 int status; 1098 1099 /* usb_clear_halt() needs a thread context */ 1100 if (test_bit (EVENT_TX_HALT, &dev->flags)) { 1101 unlink_urbs (dev, &dev->txq); 1102 status = usb_autopm_get_interface(dev->intf); 1103 if (status < 0) 1104 goto fail_pipe; 1105 status = usb_clear_halt (dev->udev, dev->out); 1106 usb_autopm_put_interface(dev->intf); 1107 if (status < 0 && 1108 status != -EPIPE && 1109 status != -ESHUTDOWN) { 1110 if (netif_msg_tx_err (dev)) 1111 fail_pipe: 1112 netdev_err(dev->net, "can't clear tx halt, status %d\n", 1113 status); 1114 } else { 1115 clear_bit (EVENT_TX_HALT, &dev->flags); 1116 if (status != -ESHUTDOWN) 1117 netif_wake_queue (dev->net); 1118 } 1119 } 1120 if (test_bit (EVENT_RX_HALT, &dev->flags)) { 1121 unlink_urbs (dev, &dev->rxq); 1122 status = usb_autopm_get_interface(dev->intf); 1123 if (status < 0) 1124 goto fail_halt; 1125 status = usb_clear_halt (dev->udev, dev->in); 1126 usb_autopm_put_interface(dev->intf); 1127 if (status < 0 && 1128 status != -EPIPE && 1129 status != -ESHUTDOWN) { 1130 if (netif_msg_rx_err (dev)) 1131 fail_halt: 1132 netdev_err(dev->net, "can't clear rx halt, status %d\n", 1133 status); 1134 } else { 1135 clear_bit (EVENT_RX_HALT, &dev->flags); 1136 tasklet_schedule (&dev->bh); 1137 } 1138 } 1139 1140 /* tasklet could resubmit itself forever if memory is tight */ 1141 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { 1142 struct urb *urb = NULL; 1143 int resched = 1; 1144 1145 if (netif_running (dev->net)) 1146 urb = usb_alloc_urb (0, GFP_KERNEL); 1147 else 1148 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1149 if (urb != NULL) { 1150 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1151 status = usb_autopm_get_interface(dev->intf); 1152 if (status < 0) { 1153 usb_free_urb(urb); 1154 goto fail_lowmem; 1155 } 1156 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) 1157 resched = 0; 1158 usb_autopm_put_interface(dev->intf); 1159 fail_lowmem: 1160 if (resched) 1161 tasklet_schedule (&dev->bh); 1162 } 1163 } 1164 1165 if (test_bit (EVENT_LINK_RESET, &dev->flags)) { 1166 struct driver_info *info = dev->driver_info; 1167 int retval = 0; 1168 1169 clear_bit (EVENT_LINK_RESET, &dev->flags); 1170 status = usb_autopm_get_interface(dev->intf); 1171 if (status < 0) 1172 goto skip_reset; 1173 if(info->link_reset && (retval = info->link_reset(dev)) < 0) { 1174 usb_autopm_put_interface(dev->intf); 1175 skip_reset: 1176 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", 1177 retval, 1178 dev->udev->bus->bus_name, 1179 dev->udev->devpath, 1180 info->description); 1181 } else { 1182 usb_autopm_put_interface(dev->intf); 1183 } 1184 1185 /* handle link change from link resetting */ 1186 __handle_link_change(dev); 1187 } 1188 1189 if (test_bit (EVENT_LINK_CHANGE, &dev->flags)) 1190 __handle_link_change(dev); 1191 1192 if (test_bit (EVENT_SET_RX_MODE, &dev->flags)) 1193 __handle_set_rx_mode(dev); 1194 1195 1196 if (dev->flags) 1197 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); 1198 } 1199 1200 /*-------------------------------------------------------------------------*/ 1201 1202 static void tx_complete (struct urb *urb) 1203 { 1204 struct sk_buff *skb = (struct sk_buff *) urb->context; 1205 struct skb_data *entry = (struct skb_data *) skb->cb; 1206 struct usbnet *dev = entry->dev; 1207 1208 if (urb->status == 0) { 1209 dev->net->stats.tx_packets += entry->packets; 1210 dev->net->stats.tx_bytes += entry->length; 1211 } else { 1212 dev->net->stats.tx_errors++; 1213 1214 switch (urb->status) { 1215 case -EPIPE: 1216 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1217 break; 1218 1219 /* software-driven interface shutdown */ 1220 case -ECONNRESET: // async unlink 1221 case -ESHUTDOWN: // hardware gone 1222 break; 1223 1224 /* like rx, tx gets controller i/o faults during hub_wq 1225 * delays and so it uses the same throttling mechanism. 1226 */ 1227 case -EPROTO: 1228 case -ETIME: 1229 case -EILSEQ: 1230 usb_mark_last_busy(dev->udev); 1231 if (!timer_pending (&dev->delay)) { 1232 mod_timer (&dev->delay, 1233 jiffies + THROTTLE_JIFFIES); 1234 netif_dbg(dev, link, dev->net, 1235 "tx throttle %d\n", urb->status); 1236 } 1237 netif_stop_queue (dev->net); 1238 break; 1239 default: 1240 netif_dbg(dev, tx_err, dev->net, 1241 "tx err %d\n", entry->urb->status); 1242 break; 1243 } 1244 } 1245 1246 usb_autopm_put_interface_async(dev->intf); 1247 (void) defer_bh(dev, skb, &dev->txq, tx_done); 1248 } 1249 1250 /*-------------------------------------------------------------------------*/ 1251 1252 void usbnet_tx_timeout (struct net_device *net) 1253 { 1254 struct usbnet *dev = netdev_priv(net); 1255 1256 unlink_urbs (dev, &dev->txq); 1257 tasklet_schedule (&dev->bh); 1258 /* this needs to be handled individually because the generic layer 1259 * doesn't know what is sufficient and could not restore private 1260 * information if a remedy of an unconditional reset were used. 1261 */ 1262 if (dev->driver_info->recover) 1263 (dev->driver_info->recover)(dev); 1264 } 1265 EXPORT_SYMBOL_GPL(usbnet_tx_timeout); 1266 1267 /*-------------------------------------------------------------------------*/ 1268 1269 static int build_dma_sg(const struct sk_buff *skb, struct urb *urb) 1270 { 1271 unsigned num_sgs, total_len = 0; 1272 int i, s = 0; 1273 1274 num_sgs = skb_shinfo(skb)->nr_frags + 1; 1275 if (num_sgs == 1) 1276 return 0; 1277 1278 /* reserve one for zero packet */ 1279 urb->sg = kmalloc((num_sgs + 1) * sizeof(struct scatterlist), 1280 GFP_ATOMIC); 1281 if (!urb->sg) 1282 return -ENOMEM; 1283 1284 urb->num_sgs = num_sgs; 1285 sg_init_table(urb->sg, urb->num_sgs + 1); 1286 1287 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb)); 1288 total_len += skb_headlen(skb); 1289 1290 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1291 struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i]; 1292 1293 total_len += skb_frag_size(f); 1294 sg_set_page(&urb->sg[i + s], f->page.p, f->size, 1295 f->page_offset); 1296 } 1297 urb->transfer_buffer_length = total_len; 1298 1299 return 1; 1300 } 1301 1302 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, 1303 struct net_device *net) 1304 { 1305 struct usbnet *dev = netdev_priv(net); 1306 unsigned int length; 1307 struct urb *urb = NULL; 1308 struct skb_data *entry; 1309 struct driver_info *info = dev->driver_info; 1310 unsigned long flags; 1311 int retval; 1312 1313 if (skb) 1314 skb_tx_timestamp(skb); 1315 1316 // some devices want funky USB-level framing, for 1317 // win32 driver (usually) and/or hardware quirks 1318 if (info->tx_fixup) { 1319 skb = info->tx_fixup (dev, skb, GFP_ATOMIC); 1320 if (!skb) { 1321 /* packet collected; minidriver waiting for more */ 1322 if (info->flags & FLAG_MULTI_PACKET) 1323 goto not_drop; 1324 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); 1325 goto drop; 1326 } 1327 } 1328 1329 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { 1330 netif_dbg(dev, tx_err, dev->net, "no urb\n"); 1331 goto drop; 1332 } 1333 1334 entry = (struct skb_data *) skb->cb; 1335 entry->urb = urb; 1336 entry->dev = dev; 1337 1338 usb_fill_bulk_urb (urb, dev->udev, dev->out, 1339 skb->data, skb->len, tx_complete, skb); 1340 if (dev->can_dma_sg) { 1341 if (build_dma_sg(skb, urb) < 0) 1342 goto drop; 1343 } 1344 length = urb->transfer_buffer_length; 1345 1346 /* don't assume the hardware handles USB_ZERO_PACKET 1347 * NOTE: strictly conforming cdc-ether devices should expect 1348 * the ZLP here, but ignore the one-byte packet. 1349 * NOTE2: CDC NCM specification is different from CDC ECM when 1350 * handling ZLP/short packets, so cdc_ncm driver will make short 1351 * packet itself if needed. 1352 */ 1353 if (length % dev->maxpacket == 0) { 1354 if (!(info->flags & FLAG_SEND_ZLP)) { 1355 if (!(info->flags & FLAG_MULTI_PACKET)) { 1356 length++; 1357 if (skb_tailroom(skb) && !urb->num_sgs) { 1358 skb->data[skb->len] = 0; 1359 __skb_put(skb, 1); 1360 } else if (urb->num_sgs) 1361 sg_set_buf(&urb->sg[urb->num_sgs++], 1362 dev->padding_pkt, 1); 1363 } 1364 } else 1365 urb->transfer_flags |= URB_ZERO_PACKET; 1366 } 1367 urb->transfer_buffer_length = length; 1368 1369 if (info->flags & FLAG_MULTI_PACKET) { 1370 /* Driver has set number of packets and a length delta. 1371 * Calculate the complete length and ensure that it's 1372 * positive. 1373 */ 1374 entry->length += length; 1375 if (WARN_ON_ONCE(entry->length <= 0)) 1376 entry->length = length; 1377 } else { 1378 usbnet_set_skb_tx_stats(skb, 1, length); 1379 } 1380 1381 spin_lock_irqsave(&dev->txq.lock, flags); 1382 retval = usb_autopm_get_interface_async(dev->intf); 1383 if (retval < 0) { 1384 spin_unlock_irqrestore(&dev->txq.lock, flags); 1385 goto drop; 1386 } 1387 1388 #ifdef CONFIG_PM 1389 /* if this triggers the device is still a sleep */ 1390 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { 1391 /* transmission will be done in resume */ 1392 usb_anchor_urb(urb, &dev->deferred); 1393 /* no use to process more packets */ 1394 netif_stop_queue(net); 1395 usb_put_urb(urb); 1396 spin_unlock_irqrestore(&dev->txq.lock, flags); 1397 netdev_dbg(dev->net, "Delaying transmission for resumption\n"); 1398 goto deferred; 1399 } 1400 #endif 1401 1402 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { 1403 case -EPIPE: 1404 netif_stop_queue (net); 1405 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1406 usb_autopm_put_interface_async(dev->intf); 1407 break; 1408 default: 1409 usb_autopm_put_interface_async(dev->intf); 1410 netif_dbg(dev, tx_err, dev->net, 1411 "tx: submit urb err %d\n", retval); 1412 break; 1413 case 0: 1414 net->trans_start = jiffies; 1415 __usbnet_queue_skb(&dev->txq, skb, tx_start); 1416 if (dev->txq.qlen >= TX_QLEN (dev)) 1417 netif_stop_queue (net); 1418 } 1419 spin_unlock_irqrestore (&dev->txq.lock, flags); 1420 1421 if (retval) { 1422 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); 1423 drop: 1424 dev->net->stats.tx_dropped++; 1425 not_drop: 1426 if (skb) 1427 dev_kfree_skb_any (skb); 1428 if (urb) { 1429 kfree(urb->sg); 1430 usb_free_urb(urb); 1431 } 1432 } else 1433 netif_dbg(dev, tx_queued, dev->net, 1434 "> tx, len %u, type 0x%x\n", length, skb->protocol); 1435 #ifdef CONFIG_PM 1436 deferred: 1437 #endif 1438 return NETDEV_TX_OK; 1439 } 1440 EXPORT_SYMBOL_GPL(usbnet_start_xmit); 1441 1442 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags) 1443 { 1444 struct urb *urb; 1445 int i; 1446 int ret = 0; 1447 1448 /* don't refill the queue all at once */ 1449 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) { 1450 urb = usb_alloc_urb(0, flags); 1451 if (urb != NULL) { 1452 ret = rx_submit(dev, urb, flags); 1453 if (ret) 1454 goto err; 1455 } else { 1456 ret = -ENOMEM; 1457 goto err; 1458 } 1459 } 1460 err: 1461 return ret; 1462 } 1463 1464 /*-------------------------------------------------------------------------*/ 1465 1466 // tasklet (work deferred from completions, in_irq) or timer 1467 1468 static void usbnet_bh (unsigned long param) 1469 { 1470 struct usbnet *dev = (struct usbnet *) param; 1471 struct sk_buff *skb; 1472 struct skb_data *entry; 1473 1474 while ((skb = skb_dequeue (&dev->done))) { 1475 entry = (struct skb_data *) skb->cb; 1476 switch (entry->state) { 1477 case rx_done: 1478 entry->state = rx_cleanup; 1479 rx_process (dev, skb); 1480 continue; 1481 case tx_done: 1482 kfree(entry->urb->sg); 1483 case rx_cleanup: 1484 usb_free_urb (entry->urb); 1485 dev_kfree_skb (skb); 1486 continue; 1487 default: 1488 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); 1489 } 1490 } 1491 1492 /* restart RX again after disabling due to high error rate */ 1493 clear_bit(EVENT_RX_KILL, &dev->flags); 1494 1495 /* waiting for all pending urbs to complete? 1496 * only then can we forgo submitting anew 1497 */ 1498 if (waitqueue_active(&dev->wait)) { 1499 if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0) 1500 wake_up_all(&dev->wait); 1501 1502 // or are we maybe short a few urbs? 1503 } else if (netif_running (dev->net) && 1504 netif_device_present (dev->net) && 1505 netif_carrier_ok(dev->net) && 1506 !timer_pending (&dev->delay) && 1507 !test_bit (EVENT_RX_HALT, &dev->flags)) { 1508 int temp = dev->rxq.qlen; 1509 1510 if (temp < RX_QLEN(dev)) { 1511 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK) 1512 return; 1513 if (temp != dev->rxq.qlen) 1514 netif_dbg(dev, link, dev->net, 1515 "rxqlen %d --> %d\n", 1516 temp, dev->rxq.qlen); 1517 if (dev->rxq.qlen < RX_QLEN(dev)) 1518 tasklet_schedule (&dev->bh); 1519 } 1520 if (dev->txq.qlen < TX_QLEN (dev)) 1521 netif_wake_queue (dev->net); 1522 } 1523 } 1524 1525 1526 /*------------------------------------------------------------------------- 1527 * 1528 * USB Device Driver support 1529 * 1530 *-------------------------------------------------------------------------*/ 1531 1532 // precondition: never called in_interrupt 1533 1534 void usbnet_disconnect (struct usb_interface *intf) 1535 { 1536 struct usbnet *dev; 1537 struct usb_device *xdev; 1538 struct net_device *net; 1539 1540 dev = usb_get_intfdata(intf); 1541 usb_set_intfdata(intf, NULL); 1542 if (!dev) 1543 return; 1544 1545 xdev = interface_to_usbdev (intf); 1546 1547 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", 1548 intf->dev.driver->name, 1549 xdev->bus->bus_name, xdev->devpath, 1550 dev->driver_info->description); 1551 1552 net = dev->net; 1553 unregister_netdev (net); 1554 1555 cancel_work_sync(&dev->kevent); 1556 1557 usb_scuttle_anchored_urbs(&dev->deferred); 1558 1559 if (dev->driver_info->unbind) 1560 dev->driver_info->unbind (dev, intf); 1561 1562 usb_kill_urb(dev->interrupt); 1563 usb_free_urb(dev->interrupt); 1564 kfree(dev->padding_pkt); 1565 1566 free_netdev(net); 1567 } 1568 EXPORT_SYMBOL_GPL(usbnet_disconnect); 1569 1570 static const struct net_device_ops usbnet_netdev_ops = { 1571 .ndo_open = usbnet_open, 1572 .ndo_stop = usbnet_stop, 1573 .ndo_start_xmit = usbnet_start_xmit, 1574 .ndo_tx_timeout = usbnet_tx_timeout, 1575 .ndo_set_rx_mode = usbnet_set_rx_mode, 1576 .ndo_change_mtu = usbnet_change_mtu, 1577 .ndo_set_mac_address = eth_mac_addr, 1578 .ndo_validate_addr = eth_validate_addr, 1579 }; 1580 1581 /*-------------------------------------------------------------------------*/ 1582 1583 // precondition: never called in_interrupt 1584 1585 static struct device_type wlan_type = { 1586 .name = "wlan", 1587 }; 1588 1589 static struct device_type wwan_type = { 1590 .name = "wwan", 1591 }; 1592 1593 int 1594 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) 1595 { 1596 struct usbnet *dev; 1597 struct net_device *net; 1598 struct usb_host_interface *interface; 1599 struct driver_info *info; 1600 struct usb_device *xdev; 1601 int status; 1602 const char *name; 1603 struct usb_driver *driver = to_usb_driver(udev->dev.driver); 1604 1605 /* usbnet already took usb runtime pm, so have to enable the feature 1606 * for usb interface, otherwise usb_autopm_get_interface may return 1607 * failure if RUNTIME_PM is enabled. 1608 */ 1609 if (!driver->supports_autosuspend) { 1610 driver->supports_autosuspend = 1; 1611 pm_runtime_enable(&udev->dev); 1612 } 1613 1614 name = udev->dev.driver->name; 1615 info = (struct driver_info *) prod->driver_info; 1616 if (!info) { 1617 dev_dbg (&udev->dev, "blacklisted by %s\n", name); 1618 return -ENODEV; 1619 } 1620 xdev = interface_to_usbdev (udev); 1621 interface = udev->cur_altsetting; 1622 1623 status = -ENOMEM; 1624 1625 // set up our own records 1626 net = alloc_etherdev(sizeof(*dev)); 1627 if (!net) 1628 goto out; 1629 1630 /* netdev_printk() needs this so do it as early as possible */ 1631 SET_NETDEV_DEV(net, &udev->dev); 1632 1633 dev = netdev_priv(net); 1634 dev->udev = xdev; 1635 dev->intf = udev; 1636 dev->driver_info = info; 1637 dev->driver_name = name; 1638 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV 1639 | NETIF_MSG_PROBE | NETIF_MSG_LINK); 1640 init_waitqueue_head(&dev->wait); 1641 skb_queue_head_init (&dev->rxq); 1642 skb_queue_head_init (&dev->txq); 1643 skb_queue_head_init (&dev->done); 1644 skb_queue_head_init(&dev->rxq_pause); 1645 dev->bh.func = usbnet_bh; 1646 dev->bh.data = (unsigned long) dev; 1647 INIT_WORK (&dev->kevent, usbnet_deferred_kevent); 1648 init_usb_anchor(&dev->deferred); 1649 dev->delay.function = usbnet_bh; 1650 dev->delay.data = (unsigned long) dev; 1651 init_timer (&dev->delay); 1652 mutex_init (&dev->phy_mutex); 1653 mutex_init(&dev->interrupt_mutex); 1654 dev->interrupt_count = 0; 1655 1656 dev->net = net; 1657 strcpy (net->name, "usb%d"); 1658 memcpy (net->dev_addr, node_id, sizeof node_id); 1659 1660 /* rx and tx sides can use different message sizes; 1661 * bind() should set rx_urb_size in that case. 1662 */ 1663 dev->hard_mtu = net->mtu + net->hard_header_len; 1664 #if 0 1665 // dma_supported() is deeply broken on almost all architectures 1666 // possible with some EHCI controllers 1667 if (dma_supported (&udev->dev, DMA_BIT_MASK(64))) 1668 net->features |= NETIF_F_HIGHDMA; 1669 #endif 1670 1671 net->netdev_ops = &usbnet_netdev_ops; 1672 net->watchdog_timeo = TX_TIMEOUT_JIFFIES; 1673 net->ethtool_ops = &usbnet_ethtool_ops; 1674 1675 // allow device-specific bind/init procedures 1676 // NOTE net->name still not usable ... 1677 if (info->bind) { 1678 status = info->bind (dev, udev); 1679 if (status < 0) 1680 goto out1; 1681 1682 // heuristic: "usb%d" for links we know are two-host, 1683 // else "eth%d" when there's reasonable doubt. userspace 1684 // can rename the link if it knows better. 1685 if ((dev->driver_info->flags & FLAG_ETHER) != 0 && 1686 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 || 1687 (net->dev_addr [0] & 0x02) == 0)) 1688 strcpy (net->name, "eth%d"); 1689 /* WLAN devices should always be named "wlan%d" */ 1690 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1691 strcpy(net->name, "wlan%d"); 1692 /* WWAN devices should always be named "wwan%d" */ 1693 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1694 strcpy(net->name, "wwan%d"); 1695 1696 /* devices that cannot do ARP */ 1697 if ((dev->driver_info->flags & FLAG_NOARP) != 0) 1698 net->flags |= IFF_NOARP; 1699 1700 /* maybe the remote can't receive an Ethernet MTU */ 1701 if (net->mtu > (dev->hard_mtu - net->hard_header_len)) 1702 net->mtu = dev->hard_mtu - net->hard_header_len; 1703 } else if (!info->in || !info->out) 1704 status = usbnet_get_endpoints (dev, udev); 1705 else { 1706 dev->in = usb_rcvbulkpipe (xdev, info->in); 1707 dev->out = usb_sndbulkpipe (xdev, info->out); 1708 if (!(info->flags & FLAG_NO_SETINT)) 1709 status = usb_set_interface (xdev, 1710 interface->desc.bInterfaceNumber, 1711 interface->desc.bAlternateSetting); 1712 else 1713 status = 0; 1714 1715 } 1716 if (status >= 0 && dev->status) 1717 status = init_status (dev, udev); 1718 if (status < 0) 1719 goto out3; 1720 1721 if (!dev->rx_urb_size) 1722 dev->rx_urb_size = dev->hard_mtu; 1723 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); 1724 1725 /* let userspace know we have a random address */ 1726 if (ether_addr_equal(net->dev_addr, node_id)) 1727 net->addr_assign_type = NET_ADDR_RANDOM; 1728 1729 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1730 SET_NETDEV_DEVTYPE(net, &wlan_type); 1731 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1732 SET_NETDEV_DEVTYPE(net, &wwan_type); 1733 1734 /* initialize max rx_qlen and tx_qlen */ 1735 usbnet_update_max_qlen(dev); 1736 1737 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) && 1738 !(info->flags & FLAG_MULTI_PACKET)) { 1739 dev->padding_pkt = kzalloc(1, GFP_KERNEL); 1740 if (!dev->padding_pkt) { 1741 status = -ENOMEM; 1742 goto out4; 1743 } 1744 } 1745 1746 status = register_netdev (net); 1747 if (status) 1748 goto out5; 1749 netif_info(dev, probe, dev->net, 1750 "register '%s' at usb-%s-%s, %s, %pM\n", 1751 udev->dev.driver->name, 1752 xdev->bus->bus_name, xdev->devpath, 1753 dev->driver_info->description, 1754 net->dev_addr); 1755 1756 // ok, it's ready to go. 1757 usb_set_intfdata (udev, dev); 1758 1759 netif_device_attach (net); 1760 1761 if (dev->driver_info->flags & FLAG_LINK_INTR) 1762 usbnet_link_change(dev, 0, 0); 1763 1764 return 0; 1765 1766 out5: 1767 kfree(dev->padding_pkt); 1768 out4: 1769 usb_free_urb(dev->interrupt); 1770 out3: 1771 if (info->unbind) 1772 info->unbind (dev, udev); 1773 out1: 1774 free_netdev(net); 1775 out: 1776 return status; 1777 } 1778 EXPORT_SYMBOL_GPL(usbnet_probe); 1779 1780 /*-------------------------------------------------------------------------*/ 1781 1782 /* 1783 * suspend the whole driver as soon as the first interface is suspended 1784 * resume only when the last interface is resumed 1785 */ 1786 1787 int usbnet_suspend (struct usb_interface *intf, pm_message_t message) 1788 { 1789 struct usbnet *dev = usb_get_intfdata(intf); 1790 1791 if (!dev->suspend_count++) { 1792 spin_lock_irq(&dev->txq.lock); 1793 /* don't autosuspend while transmitting */ 1794 if (dev->txq.qlen && PMSG_IS_AUTO(message)) { 1795 dev->suspend_count--; 1796 spin_unlock_irq(&dev->txq.lock); 1797 return -EBUSY; 1798 } else { 1799 set_bit(EVENT_DEV_ASLEEP, &dev->flags); 1800 spin_unlock_irq(&dev->txq.lock); 1801 } 1802 /* 1803 * accelerate emptying of the rx and queues, to avoid 1804 * having everything error out. 1805 */ 1806 netif_device_detach (dev->net); 1807 usbnet_terminate_urbs(dev); 1808 __usbnet_status_stop_force(dev); 1809 1810 /* 1811 * reattach so runtime management can use and 1812 * wake the device 1813 */ 1814 netif_device_attach (dev->net); 1815 } 1816 return 0; 1817 } 1818 EXPORT_SYMBOL_GPL(usbnet_suspend); 1819 1820 int usbnet_resume (struct usb_interface *intf) 1821 { 1822 struct usbnet *dev = usb_get_intfdata(intf); 1823 struct sk_buff *skb; 1824 struct urb *res; 1825 int retval; 1826 1827 if (!--dev->suspend_count) { 1828 /* resume interrupt URB if it was previously submitted */ 1829 __usbnet_status_start_force(dev, GFP_NOIO); 1830 1831 spin_lock_irq(&dev->txq.lock); 1832 while ((res = usb_get_from_anchor(&dev->deferred))) { 1833 1834 skb = (struct sk_buff *)res->context; 1835 retval = usb_submit_urb(res, GFP_ATOMIC); 1836 if (retval < 0) { 1837 dev_kfree_skb_any(skb); 1838 kfree(res->sg); 1839 usb_free_urb(res); 1840 usb_autopm_put_interface_async(dev->intf); 1841 } else { 1842 dev->net->trans_start = jiffies; 1843 __skb_queue_tail(&dev->txq, skb); 1844 } 1845 } 1846 1847 smp_mb(); 1848 clear_bit(EVENT_DEV_ASLEEP, &dev->flags); 1849 spin_unlock_irq(&dev->txq.lock); 1850 1851 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) { 1852 /* handle remote wakeup ASAP 1853 * we cannot race against stop 1854 */ 1855 if (netif_device_present(dev->net) && 1856 !timer_pending(&dev->delay) && 1857 !test_bit(EVENT_RX_HALT, &dev->flags)) 1858 rx_alloc_submit(dev, GFP_NOIO); 1859 1860 if (!(dev->txq.qlen >= TX_QLEN(dev))) 1861 netif_tx_wake_all_queues(dev->net); 1862 tasklet_schedule (&dev->bh); 1863 } 1864 } 1865 1866 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) 1867 usb_autopm_get_interface_no_resume(intf); 1868 1869 return 0; 1870 } 1871 EXPORT_SYMBOL_GPL(usbnet_resume); 1872 1873 /* 1874 * Either a subdriver implements manage_power, then it is assumed to always 1875 * be ready to be suspended or it reports the readiness to be suspended 1876 * explicitly 1877 */ 1878 void usbnet_device_suggests_idle(struct usbnet *dev) 1879 { 1880 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) { 1881 dev->intf->needs_remote_wakeup = 1; 1882 usb_autopm_put_interface_async(dev->intf); 1883 } 1884 } 1885 EXPORT_SYMBOL(usbnet_device_suggests_idle); 1886 1887 /* 1888 * For devices that can do without special commands 1889 */ 1890 int usbnet_manage_power(struct usbnet *dev, int on) 1891 { 1892 dev->intf->needs_remote_wakeup = on; 1893 return 0; 1894 } 1895 EXPORT_SYMBOL(usbnet_manage_power); 1896 1897 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset) 1898 { 1899 /* update link after link is reseted */ 1900 if (link && !need_reset) 1901 netif_carrier_on(dev->net); 1902 else 1903 netif_carrier_off(dev->net); 1904 1905 if (need_reset && link) 1906 usbnet_defer_kevent(dev, EVENT_LINK_RESET); 1907 else 1908 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE); 1909 } 1910 EXPORT_SYMBOL(usbnet_link_change); 1911 1912 /*-------------------------------------------------------------------------*/ 1913 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1914 u16 value, u16 index, void *data, u16 size) 1915 { 1916 void *buf = NULL; 1917 int err = -ENOMEM; 1918 1919 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x" 1920 " value=0x%04x index=0x%04x size=%d\n", 1921 cmd, reqtype, value, index, size); 1922 1923 if (data) { 1924 buf = kmalloc(size, GFP_KERNEL); 1925 if (!buf) 1926 goto out; 1927 } 1928 1929 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), 1930 cmd, reqtype, value, index, buf, size, 1931 USB_CTRL_GET_TIMEOUT); 1932 if (err > 0 && err <= size) 1933 memcpy(data, buf, err); 1934 kfree(buf); 1935 out: 1936 return err; 1937 } 1938 1939 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1940 u16 value, u16 index, const void *data, 1941 u16 size) 1942 { 1943 void *buf = NULL; 1944 int err = -ENOMEM; 1945 1946 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 1947 " value=0x%04x index=0x%04x size=%d\n", 1948 cmd, reqtype, value, index, size); 1949 1950 if (data) { 1951 buf = kmemdup(data, size, GFP_KERNEL); 1952 if (!buf) 1953 goto out; 1954 } 1955 1956 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), 1957 cmd, reqtype, value, index, buf, size, 1958 USB_CTRL_SET_TIMEOUT); 1959 kfree(buf); 1960 1961 out: 1962 return err; 1963 } 1964 1965 /* 1966 * The function can't be called inside suspend/resume callback, 1967 * otherwise deadlock will be caused. 1968 */ 1969 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1970 u16 value, u16 index, void *data, u16 size) 1971 { 1972 int ret; 1973 1974 if (usb_autopm_get_interface(dev->intf) < 0) 1975 return -ENODEV; 1976 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index, 1977 data, size); 1978 usb_autopm_put_interface(dev->intf); 1979 return ret; 1980 } 1981 EXPORT_SYMBOL_GPL(usbnet_read_cmd); 1982 1983 /* 1984 * The function can't be called inside suspend/resume callback, 1985 * otherwise deadlock will be caused. 1986 */ 1987 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1988 u16 value, u16 index, const void *data, u16 size) 1989 { 1990 int ret; 1991 1992 if (usb_autopm_get_interface(dev->intf) < 0) 1993 return -ENODEV; 1994 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index, 1995 data, size); 1996 usb_autopm_put_interface(dev->intf); 1997 return ret; 1998 } 1999 EXPORT_SYMBOL_GPL(usbnet_write_cmd); 2000 2001 /* 2002 * The function can be called inside suspend/resume callback safely 2003 * and should only be called by suspend/resume callback generally. 2004 */ 2005 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 2006 u16 value, u16 index, void *data, u16 size) 2007 { 2008 return __usbnet_read_cmd(dev, cmd, reqtype, value, index, 2009 data, size); 2010 } 2011 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm); 2012 2013 /* 2014 * The function can be called inside suspend/resume callback safely 2015 * and should only be called by suspend/resume callback generally. 2016 */ 2017 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 2018 u16 value, u16 index, const void *data, 2019 u16 size) 2020 { 2021 return __usbnet_write_cmd(dev, cmd, reqtype, value, index, 2022 data, size); 2023 } 2024 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm); 2025 2026 static void usbnet_async_cmd_cb(struct urb *urb) 2027 { 2028 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context; 2029 int status = urb->status; 2030 2031 if (status < 0) 2032 dev_dbg(&urb->dev->dev, "%s failed with %d", 2033 __func__, status); 2034 2035 kfree(req); 2036 usb_free_urb(urb); 2037 } 2038 2039 /* 2040 * The caller must make sure that device can't be put into suspend 2041 * state until the control URB completes. 2042 */ 2043 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype, 2044 u16 value, u16 index, const void *data, u16 size) 2045 { 2046 struct usb_ctrlrequest *req = NULL; 2047 struct urb *urb; 2048 int err = -ENOMEM; 2049 void *buf = NULL; 2050 2051 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 2052 " value=0x%04x index=0x%04x size=%d\n", 2053 cmd, reqtype, value, index, size); 2054 2055 urb = usb_alloc_urb(0, GFP_ATOMIC); 2056 if (!urb) { 2057 netdev_err(dev->net, "Error allocating URB in" 2058 " %s!\n", __func__); 2059 goto fail; 2060 } 2061 2062 if (data) { 2063 buf = kmemdup(data, size, GFP_ATOMIC); 2064 if (!buf) { 2065 netdev_err(dev->net, "Error allocating buffer" 2066 " in %s!\n", __func__); 2067 goto fail_free; 2068 } 2069 } 2070 2071 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC); 2072 if (!req) 2073 goto fail_free_buf; 2074 2075 req->bRequestType = reqtype; 2076 req->bRequest = cmd; 2077 req->wValue = cpu_to_le16(value); 2078 req->wIndex = cpu_to_le16(index); 2079 req->wLength = cpu_to_le16(size); 2080 2081 usb_fill_control_urb(urb, dev->udev, 2082 usb_sndctrlpipe(dev->udev, 0), 2083 (void *)req, buf, size, 2084 usbnet_async_cmd_cb, req); 2085 urb->transfer_flags |= URB_FREE_BUFFER; 2086 2087 err = usb_submit_urb(urb, GFP_ATOMIC); 2088 if (err < 0) { 2089 netdev_err(dev->net, "Error submitting the control" 2090 " message: status=%d\n", err); 2091 goto fail_free; 2092 } 2093 return 0; 2094 2095 fail_free_buf: 2096 kfree(buf); 2097 fail_free: 2098 kfree(req); 2099 usb_free_urb(urb); 2100 fail: 2101 return err; 2102 2103 } 2104 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async); 2105 /*-------------------------------------------------------------------------*/ 2106 2107 static int __init usbnet_init(void) 2108 { 2109 /* Compiler should optimize this out. */ 2110 BUILD_BUG_ON( 2111 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data)); 2112 2113 eth_random_addr(node_id); 2114 return 0; 2115 } 2116 module_init(usbnet_init); 2117 2118 static void __exit usbnet_exit(void) 2119 { 2120 } 2121 module_exit(usbnet_exit); 2122 2123 MODULE_AUTHOR("David Brownell"); 2124 MODULE_DESCRIPTION("USB network driver framework"); 2125 MODULE_LICENSE("GPL"); 2126