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 /* only update if unset to allow minidriver rx_fixup override */ 327 if (skb->protocol == 0) 328 skb->protocol = eth_type_trans (skb, dev->net); 329 330 dev->net->stats.rx_packets++; 331 dev->net->stats.rx_bytes += skb->len; 332 333 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n", 334 skb->len + sizeof (struct ethhdr), skb->protocol); 335 memset (skb->cb, 0, sizeof (struct skb_data)); 336 337 if (skb_defer_rx_timestamp(skb)) 338 return; 339 340 status = netif_rx (skb); 341 if (status != NET_RX_SUCCESS) 342 netif_dbg(dev, rx_err, dev->net, 343 "netif_rx status %d\n", status); 344 } 345 EXPORT_SYMBOL_GPL(usbnet_skb_return); 346 347 /* must be called if hard_mtu or rx_urb_size changed */ 348 void usbnet_update_max_qlen(struct usbnet *dev) 349 { 350 enum usb_device_speed speed = dev->udev->speed; 351 352 switch (speed) { 353 case USB_SPEED_HIGH: 354 dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size; 355 dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu; 356 break; 357 case USB_SPEED_SUPER: 358 case USB_SPEED_SUPER_PLUS: 359 /* 360 * Not take default 5ms qlen for super speed HC to 361 * save memory, and iperf tests show 2.5ms qlen can 362 * work well 363 */ 364 dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size; 365 dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu; 366 break; 367 default: 368 dev->rx_qlen = dev->tx_qlen = 4; 369 } 370 } 371 EXPORT_SYMBOL_GPL(usbnet_update_max_qlen); 372 373 374 /*------------------------------------------------------------------------- 375 * 376 * Network Device Driver (peer link to "Host Device", from USB host) 377 * 378 *-------------------------------------------------------------------------*/ 379 380 int usbnet_change_mtu (struct net_device *net, int new_mtu) 381 { 382 struct usbnet *dev = netdev_priv(net); 383 int ll_mtu = new_mtu + net->hard_header_len; 384 int old_hard_mtu = dev->hard_mtu; 385 int old_rx_urb_size = dev->rx_urb_size; 386 387 // no second zero-length packet read wanted after mtu-sized packets 388 if ((ll_mtu % dev->maxpacket) == 0) 389 return -EDOM; 390 net->mtu = new_mtu; 391 392 dev->hard_mtu = net->mtu + net->hard_header_len; 393 if (dev->rx_urb_size == old_hard_mtu) { 394 dev->rx_urb_size = dev->hard_mtu; 395 if (dev->rx_urb_size > old_rx_urb_size) { 396 usbnet_pause_rx(dev); 397 usbnet_unlink_rx_urbs(dev); 398 usbnet_resume_rx(dev); 399 } 400 } 401 402 /* max qlen depend on hard_mtu and rx_urb_size */ 403 usbnet_update_max_qlen(dev); 404 405 return 0; 406 } 407 EXPORT_SYMBOL_GPL(usbnet_change_mtu); 408 409 /* The caller must hold list->lock */ 410 static void __usbnet_queue_skb(struct sk_buff_head *list, 411 struct sk_buff *newsk, enum skb_state state) 412 { 413 struct skb_data *entry = (struct skb_data *) newsk->cb; 414 415 __skb_queue_tail(list, newsk); 416 entry->state = state; 417 } 418 419 /*-------------------------------------------------------------------------*/ 420 421 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from 422 * completion callbacks. 2.5 should have fixed those bugs... 423 */ 424 425 static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb, 426 struct sk_buff_head *list, enum skb_state state) 427 { 428 unsigned long flags; 429 enum skb_state old_state; 430 struct skb_data *entry = (struct skb_data *) skb->cb; 431 432 spin_lock_irqsave(&list->lock, flags); 433 old_state = entry->state; 434 entry->state = state; 435 __skb_unlink(skb, list); 436 437 /* defer_bh() is never called with list == &dev->done. 438 * spin_lock_nested() tells lockdep that it is OK to take 439 * dev->done.lock here with list->lock held. 440 */ 441 spin_lock_nested(&dev->done.lock, SINGLE_DEPTH_NESTING); 442 443 __skb_queue_tail(&dev->done, skb); 444 if (dev->done.qlen == 1) 445 tasklet_schedule(&dev->bh); 446 spin_unlock(&dev->done.lock); 447 spin_unlock_irqrestore(&list->lock, flags); 448 return old_state; 449 } 450 451 /* some work can't be done in tasklets, so we use keventd 452 * 453 * NOTE: annoying asymmetry: if it's active, schedule_work() fails, 454 * but tasklet_schedule() doesn't. hope the failure is rare. 455 */ 456 void usbnet_defer_kevent (struct usbnet *dev, int work) 457 { 458 set_bit (work, &dev->flags); 459 if (!schedule_work (&dev->kevent)) { 460 if (net_ratelimit()) 461 netdev_err(dev->net, "kevent %d may have been dropped\n", work); 462 } else { 463 netdev_dbg(dev->net, "kevent %d scheduled\n", work); 464 } 465 } 466 EXPORT_SYMBOL_GPL(usbnet_defer_kevent); 467 468 /*-------------------------------------------------------------------------*/ 469 470 static void rx_complete (struct urb *urb); 471 472 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) 473 { 474 struct sk_buff *skb; 475 struct skb_data *entry; 476 int retval = 0; 477 unsigned long lockflags; 478 size_t size = dev->rx_urb_size; 479 480 /* prevent rx skb allocation when error ratio is high */ 481 if (test_bit(EVENT_RX_KILL, &dev->flags)) { 482 usb_free_urb(urb); 483 return -ENOLINK; 484 } 485 486 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags); 487 if (!skb) { 488 netif_dbg(dev, rx_err, dev->net, "no rx skb\n"); 489 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 490 usb_free_urb (urb); 491 return -ENOMEM; 492 } 493 494 entry = (struct skb_data *) skb->cb; 495 entry->urb = urb; 496 entry->dev = dev; 497 entry->length = 0; 498 499 usb_fill_bulk_urb (urb, dev->udev, dev->in, 500 skb->data, size, rx_complete, skb); 501 502 spin_lock_irqsave (&dev->rxq.lock, lockflags); 503 504 if (netif_running (dev->net) && 505 netif_device_present (dev->net) && 506 !test_bit (EVENT_RX_HALT, &dev->flags) && 507 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) { 508 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) { 509 case -EPIPE: 510 usbnet_defer_kevent (dev, EVENT_RX_HALT); 511 break; 512 case -ENOMEM: 513 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 514 break; 515 case -ENODEV: 516 netif_dbg(dev, ifdown, dev->net, "device gone\n"); 517 netif_device_detach (dev->net); 518 break; 519 case -EHOSTUNREACH: 520 retval = -ENOLINK; 521 break; 522 default: 523 netif_dbg(dev, rx_err, dev->net, 524 "rx submit, %d\n", retval); 525 tasklet_schedule (&dev->bh); 526 break; 527 case 0: 528 __usbnet_queue_skb(&dev->rxq, skb, rx_start); 529 } 530 } else { 531 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n"); 532 retval = -ENOLINK; 533 } 534 spin_unlock_irqrestore (&dev->rxq.lock, lockflags); 535 if (retval) { 536 dev_kfree_skb_any (skb); 537 usb_free_urb (urb); 538 } 539 return retval; 540 } 541 542 543 /*-------------------------------------------------------------------------*/ 544 545 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb) 546 { 547 if (dev->driver_info->rx_fixup && 548 !dev->driver_info->rx_fixup (dev, skb)) { 549 /* With RX_ASSEMBLE, rx_fixup() must update counters */ 550 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE)) 551 dev->net->stats.rx_errors++; 552 goto done; 553 } 554 // else network stack removes extra byte if we forced a short packet 555 556 /* all data was already cloned from skb inside the driver */ 557 if (dev->driver_info->flags & FLAG_MULTI_PACKET) 558 goto done; 559 560 if (skb->len < ETH_HLEN) { 561 dev->net->stats.rx_errors++; 562 dev->net->stats.rx_length_errors++; 563 netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len); 564 } else { 565 usbnet_skb_return(dev, skb); 566 return; 567 } 568 569 done: 570 skb_queue_tail(&dev->done, skb); 571 } 572 573 /*-------------------------------------------------------------------------*/ 574 575 static void rx_complete (struct urb *urb) 576 { 577 struct sk_buff *skb = (struct sk_buff *) urb->context; 578 struct skb_data *entry = (struct skb_data *) skb->cb; 579 struct usbnet *dev = entry->dev; 580 int urb_status = urb->status; 581 enum skb_state state; 582 583 skb_put (skb, urb->actual_length); 584 state = rx_done; 585 entry->urb = NULL; 586 587 switch (urb_status) { 588 /* success */ 589 case 0: 590 break; 591 592 /* stalls need manual reset. this is rare ... except that 593 * when going through USB 2.0 TTs, unplug appears this way. 594 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ 595 * storm, recovering as needed. 596 */ 597 case -EPIPE: 598 dev->net->stats.rx_errors++; 599 usbnet_defer_kevent (dev, EVENT_RX_HALT); 600 // FALLTHROUGH 601 602 /* software-driven interface shutdown */ 603 case -ECONNRESET: /* async unlink */ 604 case -ESHUTDOWN: /* hardware gone */ 605 netif_dbg(dev, ifdown, dev->net, 606 "rx shutdown, code %d\n", urb_status); 607 goto block; 608 609 /* we get controller i/o faults during hub_wq disconnect() delays. 610 * throttle down resubmits, to avoid log floods; just temporarily, 611 * so we still recover when the fault isn't a hub_wq delay. 612 */ 613 case -EPROTO: 614 case -ETIME: 615 case -EILSEQ: 616 dev->net->stats.rx_errors++; 617 if (!timer_pending (&dev->delay)) { 618 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); 619 netif_dbg(dev, link, dev->net, 620 "rx throttle %d\n", urb_status); 621 } 622 block: 623 state = rx_cleanup; 624 entry->urb = urb; 625 urb = NULL; 626 break; 627 628 /* data overrun ... flush fifo? */ 629 case -EOVERFLOW: 630 dev->net->stats.rx_over_errors++; 631 // FALLTHROUGH 632 633 default: 634 state = rx_cleanup; 635 dev->net->stats.rx_errors++; 636 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status); 637 break; 638 } 639 640 /* stop rx if packet error rate is high */ 641 if (++dev->pkt_cnt > 30) { 642 dev->pkt_cnt = 0; 643 dev->pkt_err = 0; 644 } else { 645 if (state == rx_cleanup) 646 dev->pkt_err++; 647 if (dev->pkt_err > 20) 648 set_bit(EVENT_RX_KILL, &dev->flags); 649 } 650 651 state = defer_bh(dev, skb, &dev->rxq, state); 652 653 if (urb) { 654 if (netif_running (dev->net) && 655 !test_bit (EVENT_RX_HALT, &dev->flags) && 656 state != unlink_start) { 657 rx_submit (dev, urb, GFP_ATOMIC); 658 usb_mark_last_busy(dev->udev); 659 return; 660 } 661 usb_free_urb (urb); 662 } 663 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n"); 664 } 665 666 /*-------------------------------------------------------------------------*/ 667 void usbnet_pause_rx(struct usbnet *dev) 668 { 669 set_bit(EVENT_RX_PAUSED, &dev->flags); 670 671 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n"); 672 } 673 EXPORT_SYMBOL_GPL(usbnet_pause_rx); 674 675 void usbnet_resume_rx(struct usbnet *dev) 676 { 677 struct sk_buff *skb; 678 int num = 0; 679 680 clear_bit(EVENT_RX_PAUSED, &dev->flags); 681 682 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) { 683 usbnet_skb_return(dev, skb); 684 num++; 685 } 686 687 tasklet_schedule(&dev->bh); 688 689 netif_dbg(dev, rx_status, dev->net, 690 "paused rx queue disabled, %d skbs requeued\n", num); 691 } 692 EXPORT_SYMBOL_GPL(usbnet_resume_rx); 693 694 void usbnet_purge_paused_rxq(struct usbnet *dev) 695 { 696 skb_queue_purge(&dev->rxq_pause); 697 } 698 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq); 699 700 /*-------------------------------------------------------------------------*/ 701 702 // unlink pending rx/tx; completion handlers do all other cleanup 703 704 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) 705 { 706 unsigned long flags; 707 struct sk_buff *skb; 708 int count = 0; 709 710 spin_lock_irqsave (&q->lock, flags); 711 while (!skb_queue_empty(q)) { 712 struct skb_data *entry; 713 struct urb *urb; 714 int retval; 715 716 skb_queue_walk(q, skb) { 717 entry = (struct skb_data *) skb->cb; 718 if (entry->state != unlink_start) 719 goto found; 720 } 721 break; 722 found: 723 entry->state = unlink_start; 724 urb = entry->urb; 725 726 /* 727 * Get reference count of the URB to avoid it to be 728 * freed during usb_unlink_urb, which may trigger 729 * use-after-free problem inside usb_unlink_urb since 730 * usb_unlink_urb is always racing with .complete 731 * handler(include defer_bh). 732 */ 733 usb_get_urb(urb); 734 spin_unlock_irqrestore(&q->lock, flags); 735 // during some PM-driven resume scenarios, 736 // these (async) unlinks complete immediately 737 retval = usb_unlink_urb (urb); 738 if (retval != -EINPROGRESS && retval != 0) 739 netdev_dbg(dev->net, "unlink urb err, %d\n", retval); 740 else 741 count++; 742 usb_put_urb(urb); 743 spin_lock_irqsave(&q->lock, flags); 744 } 745 spin_unlock_irqrestore (&q->lock, flags); 746 return count; 747 } 748 749 // Flush all pending rx urbs 750 // minidrivers may need to do this when the MTU changes 751 752 void usbnet_unlink_rx_urbs(struct usbnet *dev) 753 { 754 if (netif_running(dev->net)) { 755 (void) unlink_urbs (dev, &dev->rxq); 756 tasklet_schedule(&dev->bh); 757 } 758 } 759 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); 760 761 /*-------------------------------------------------------------------------*/ 762 763 static void wait_skb_queue_empty(struct sk_buff_head *q) 764 { 765 unsigned long flags; 766 767 spin_lock_irqsave(&q->lock, flags); 768 while (!skb_queue_empty(q)) { 769 spin_unlock_irqrestore(&q->lock, flags); 770 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS)); 771 set_current_state(TASK_UNINTERRUPTIBLE); 772 spin_lock_irqsave(&q->lock, flags); 773 } 774 spin_unlock_irqrestore(&q->lock, flags); 775 } 776 777 // precondition: never called in_interrupt 778 static void usbnet_terminate_urbs(struct usbnet *dev) 779 { 780 DECLARE_WAITQUEUE(wait, current); 781 int temp; 782 783 /* ensure there are no more active urbs */ 784 add_wait_queue(&dev->wait, &wait); 785 set_current_state(TASK_UNINTERRUPTIBLE); 786 temp = unlink_urbs(dev, &dev->txq) + 787 unlink_urbs(dev, &dev->rxq); 788 789 /* maybe wait for deletions to finish. */ 790 wait_skb_queue_empty(&dev->rxq); 791 wait_skb_queue_empty(&dev->txq); 792 wait_skb_queue_empty(&dev->done); 793 netif_dbg(dev, ifdown, dev->net, 794 "waited for %d urb completions\n", temp); 795 set_current_state(TASK_RUNNING); 796 remove_wait_queue(&dev->wait, &wait); 797 } 798 799 int usbnet_stop (struct net_device *net) 800 { 801 struct usbnet *dev = netdev_priv(net); 802 struct driver_info *info = dev->driver_info; 803 int retval, pm, mpn; 804 805 clear_bit(EVENT_DEV_OPEN, &dev->flags); 806 netif_stop_queue (net); 807 808 netif_info(dev, ifdown, dev->net, 809 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n", 810 net->stats.rx_packets, net->stats.tx_packets, 811 net->stats.rx_errors, net->stats.tx_errors); 812 813 /* to not race resume */ 814 pm = usb_autopm_get_interface(dev->intf); 815 /* allow minidriver to stop correctly (wireless devices to turn off 816 * radio etc) */ 817 if (info->stop) { 818 retval = info->stop(dev); 819 if (retval < 0) 820 netif_info(dev, ifdown, dev->net, 821 "stop fail (%d) usbnet usb-%s-%s, %s\n", 822 retval, 823 dev->udev->bus->bus_name, dev->udev->devpath, 824 info->description); 825 } 826 827 if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) 828 usbnet_terminate_urbs(dev); 829 830 usbnet_status_stop(dev); 831 832 usbnet_purge_paused_rxq(dev); 833 834 mpn = !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags); 835 836 /* deferred work (task, timer, softirq) must also stop. 837 * can't flush_scheduled_work() until we drop rtnl (later), 838 * else workers could deadlock; so make workers a NOP. 839 */ 840 dev->flags = 0; 841 del_timer_sync (&dev->delay); 842 tasklet_kill (&dev->bh); 843 if (!pm) 844 usb_autopm_put_interface(dev->intf); 845 846 if (info->manage_power && mpn) 847 info->manage_power(dev, 0); 848 else 849 usb_autopm_put_interface(dev->intf); 850 851 return 0; 852 } 853 EXPORT_SYMBOL_GPL(usbnet_stop); 854 855 /*-------------------------------------------------------------------------*/ 856 857 // posts reads, and enables write queuing 858 859 // precondition: never called in_interrupt 860 861 int usbnet_open (struct net_device *net) 862 { 863 struct usbnet *dev = netdev_priv(net); 864 int retval; 865 struct driver_info *info = dev->driver_info; 866 867 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { 868 netif_info(dev, ifup, dev->net, 869 "resumption fail (%d) usbnet usb-%s-%s, %s\n", 870 retval, 871 dev->udev->bus->bus_name, 872 dev->udev->devpath, 873 info->description); 874 goto done_nopm; 875 } 876 877 // put into "known safe" state 878 if (info->reset && (retval = info->reset (dev)) < 0) { 879 netif_info(dev, ifup, dev->net, 880 "open reset fail (%d) usbnet usb-%s-%s, %s\n", 881 retval, 882 dev->udev->bus->bus_name, 883 dev->udev->devpath, 884 info->description); 885 goto done; 886 } 887 888 /* hard_mtu or rx_urb_size may change in reset() */ 889 usbnet_update_max_qlen(dev); 890 891 // insist peer be connected 892 if (info->check_connect && (retval = info->check_connect (dev)) < 0) { 893 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval); 894 goto done; 895 } 896 897 /* start any status interrupt transfer */ 898 if (dev->interrupt) { 899 retval = usbnet_status_start(dev, GFP_KERNEL); 900 if (retval < 0) { 901 netif_err(dev, ifup, dev->net, 902 "intr submit %d\n", retval); 903 goto done; 904 } 905 } 906 907 set_bit(EVENT_DEV_OPEN, &dev->flags); 908 netif_start_queue (net); 909 netif_info(dev, ifup, dev->net, 910 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n", 911 (int)RX_QLEN(dev), (int)TX_QLEN(dev), 912 dev->net->mtu, 913 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" : 914 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" : 915 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" : 916 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" : 917 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" : 918 "simple"); 919 920 /* reset rx error state */ 921 dev->pkt_cnt = 0; 922 dev->pkt_err = 0; 923 clear_bit(EVENT_RX_KILL, &dev->flags); 924 925 // delay posting reads until we're fully open 926 tasklet_schedule (&dev->bh); 927 if (info->manage_power) { 928 retval = info->manage_power(dev, 1); 929 if (retval < 0) { 930 retval = 0; 931 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags); 932 } else { 933 usb_autopm_put_interface(dev->intf); 934 } 935 } 936 return retval; 937 done: 938 usb_autopm_put_interface(dev->intf); 939 done_nopm: 940 return retval; 941 } 942 EXPORT_SYMBOL_GPL(usbnet_open); 943 944 /*-------------------------------------------------------------------------*/ 945 946 /* ethtool methods; minidrivers may need to add some more, but 947 * they'll probably want to use this base set. 948 */ 949 950 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd) 951 { 952 struct usbnet *dev = netdev_priv(net); 953 954 if (!dev->mii.mdio_read) 955 return -EOPNOTSUPP; 956 957 return mii_ethtool_gset(&dev->mii, cmd); 958 } 959 EXPORT_SYMBOL_GPL(usbnet_get_settings); 960 961 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd) 962 { 963 struct usbnet *dev = netdev_priv(net); 964 int retval; 965 966 if (!dev->mii.mdio_write) 967 return -EOPNOTSUPP; 968 969 retval = mii_ethtool_sset(&dev->mii, cmd); 970 971 /* link speed/duplex might have changed */ 972 if (dev->driver_info->link_reset) 973 dev->driver_info->link_reset(dev); 974 975 /* hard_mtu or rx_urb_size may change in link_reset() */ 976 usbnet_update_max_qlen(dev); 977 978 return retval; 979 980 } 981 EXPORT_SYMBOL_GPL(usbnet_set_settings); 982 983 u32 usbnet_get_link (struct net_device *net) 984 { 985 struct usbnet *dev = netdev_priv(net); 986 987 /* If a check_connect is defined, return its result */ 988 if (dev->driver_info->check_connect) 989 return dev->driver_info->check_connect (dev) == 0; 990 991 /* if the device has mii operations, use those */ 992 if (dev->mii.mdio_read) 993 return mii_link_ok(&dev->mii); 994 995 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ 996 return ethtool_op_get_link(net); 997 } 998 EXPORT_SYMBOL_GPL(usbnet_get_link); 999 1000 int usbnet_nway_reset(struct net_device *net) 1001 { 1002 struct usbnet *dev = netdev_priv(net); 1003 1004 if (!dev->mii.mdio_write) 1005 return -EOPNOTSUPP; 1006 1007 return mii_nway_restart(&dev->mii); 1008 } 1009 EXPORT_SYMBOL_GPL(usbnet_nway_reset); 1010 1011 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) 1012 { 1013 struct usbnet *dev = netdev_priv(net); 1014 1015 strlcpy (info->driver, dev->driver_name, sizeof info->driver); 1016 strlcpy (info->version, DRIVER_VERSION, sizeof info->version); 1017 strlcpy (info->fw_version, dev->driver_info->description, 1018 sizeof info->fw_version); 1019 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); 1020 } 1021 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); 1022 1023 u32 usbnet_get_msglevel (struct net_device *net) 1024 { 1025 struct usbnet *dev = netdev_priv(net); 1026 1027 return dev->msg_enable; 1028 } 1029 EXPORT_SYMBOL_GPL(usbnet_get_msglevel); 1030 1031 void usbnet_set_msglevel (struct net_device *net, u32 level) 1032 { 1033 struct usbnet *dev = netdev_priv(net); 1034 1035 dev->msg_enable = level; 1036 } 1037 EXPORT_SYMBOL_GPL(usbnet_set_msglevel); 1038 1039 /* drivers may override default ethtool_ops in their bind() routine */ 1040 static const struct ethtool_ops usbnet_ethtool_ops = { 1041 .get_settings = usbnet_get_settings, 1042 .set_settings = usbnet_set_settings, 1043 .get_link = usbnet_get_link, 1044 .nway_reset = usbnet_nway_reset, 1045 .get_drvinfo = usbnet_get_drvinfo, 1046 .get_msglevel = usbnet_get_msglevel, 1047 .set_msglevel = usbnet_set_msglevel, 1048 .get_ts_info = ethtool_op_get_ts_info, 1049 }; 1050 1051 /*-------------------------------------------------------------------------*/ 1052 1053 static void __handle_link_change(struct usbnet *dev) 1054 { 1055 if (!test_bit(EVENT_DEV_OPEN, &dev->flags)) 1056 return; 1057 1058 if (!netif_carrier_ok(dev->net)) { 1059 /* kill URBs for reading packets to save bus bandwidth */ 1060 unlink_urbs(dev, &dev->rxq); 1061 1062 /* 1063 * tx_timeout will unlink URBs for sending packets and 1064 * tx queue is stopped by netcore after link becomes off 1065 */ 1066 } else { 1067 /* submitting URBs for reading packets */ 1068 tasklet_schedule(&dev->bh); 1069 } 1070 1071 /* hard_mtu or rx_urb_size may change during link change */ 1072 usbnet_update_max_qlen(dev); 1073 1074 clear_bit(EVENT_LINK_CHANGE, &dev->flags); 1075 } 1076 1077 static void usbnet_set_rx_mode(struct net_device *net) 1078 { 1079 struct usbnet *dev = netdev_priv(net); 1080 1081 usbnet_defer_kevent(dev, EVENT_SET_RX_MODE); 1082 } 1083 1084 static void __handle_set_rx_mode(struct usbnet *dev) 1085 { 1086 if (dev->driver_info->set_rx_mode) 1087 (dev->driver_info->set_rx_mode)(dev); 1088 1089 clear_bit(EVENT_SET_RX_MODE, &dev->flags); 1090 } 1091 1092 /* work that cannot be done in interrupt context uses keventd. 1093 * 1094 * NOTE: with 2.5 we could do more of this using completion callbacks, 1095 * especially now that control transfers can be queued. 1096 */ 1097 static void 1098 usbnet_deferred_kevent (struct work_struct *work) 1099 { 1100 struct usbnet *dev = 1101 container_of(work, struct usbnet, kevent); 1102 int status; 1103 1104 /* usb_clear_halt() needs a thread context */ 1105 if (test_bit (EVENT_TX_HALT, &dev->flags)) { 1106 unlink_urbs (dev, &dev->txq); 1107 status = usb_autopm_get_interface(dev->intf); 1108 if (status < 0) 1109 goto fail_pipe; 1110 status = usb_clear_halt (dev->udev, dev->out); 1111 usb_autopm_put_interface(dev->intf); 1112 if (status < 0 && 1113 status != -EPIPE && 1114 status != -ESHUTDOWN) { 1115 if (netif_msg_tx_err (dev)) 1116 fail_pipe: 1117 netdev_err(dev->net, "can't clear tx halt, status %d\n", 1118 status); 1119 } else { 1120 clear_bit (EVENT_TX_HALT, &dev->flags); 1121 if (status != -ESHUTDOWN) 1122 netif_wake_queue (dev->net); 1123 } 1124 } 1125 if (test_bit (EVENT_RX_HALT, &dev->flags)) { 1126 unlink_urbs (dev, &dev->rxq); 1127 status = usb_autopm_get_interface(dev->intf); 1128 if (status < 0) 1129 goto fail_halt; 1130 status = usb_clear_halt (dev->udev, dev->in); 1131 usb_autopm_put_interface(dev->intf); 1132 if (status < 0 && 1133 status != -EPIPE && 1134 status != -ESHUTDOWN) { 1135 if (netif_msg_rx_err (dev)) 1136 fail_halt: 1137 netdev_err(dev->net, "can't clear rx halt, status %d\n", 1138 status); 1139 } else { 1140 clear_bit (EVENT_RX_HALT, &dev->flags); 1141 tasklet_schedule (&dev->bh); 1142 } 1143 } 1144 1145 /* tasklet could resubmit itself forever if memory is tight */ 1146 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { 1147 struct urb *urb = NULL; 1148 int resched = 1; 1149 1150 if (netif_running (dev->net)) 1151 urb = usb_alloc_urb (0, GFP_KERNEL); 1152 else 1153 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1154 if (urb != NULL) { 1155 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1156 status = usb_autopm_get_interface(dev->intf); 1157 if (status < 0) { 1158 usb_free_urb(urb); 1159 goto fail_lowmem; 1160 } 1161 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) 1162 resched = 0; 1163 usb_autopm_put_interface(dev->intf); 1164 fail_lowmem: 1165 if (resched) 1166 tasklet_schedule (&dev->bh); 1167 } 1168 } 1169 1170 if (test_bit (EVENT_LINK_RESET, &dev->flags)) { 1171 struct driver_info *info = dev->driver_info; 1172 int retval = 0; 1173 1174 clear_bit (EVENT_LINK_RESET, &dev->flags); 1175 status = usb_autopm_get_interface(dev->intf); 1176 if (status < 0) 1177 goto skip_reset; 1178 if(info->link_reset && (retval = info->link_reset(dev)) < 0) { 1179 usb_autopm_put_interface(dev->intf); 1180 skip_reset: 1181 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", 1182 retval, 1183 dev->udev->bus->bus_name, 1184 dev->udev->devpath, 1185 info->description); 1186 } else { 1187 usb_autopm_put_interface(dev->intf); 1188 } 1189 1190 /* handle link change from link resetting */ 1191 __handle_link_change(dev); 1192 } 1193 1194 if (test_bit (EVENT_LINK_CHANGE, &dev->flags)) 1195 __handle_link_change(dev); 1196 1197 if (test_bit (EVENT_SET_RX_MODE, &dev->flags)) 1198 __handle_set_rx_mode(dev); 1199 1200 1201 if (dev->flags) 1202 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); 1203 } 1204 1205 /*-------------------------------------------------------------------------*/ 1206 1207 static void tx_complete (struct urb *urb) 1208 { 1209 struct sk_buff *skb = (struct sk_buff *) urb->context; 1210 struct skb_data *entry = (struct skb_data *) skb->cb; 1211 struct usbnet *dev = entry->dev; 1212 1213 if (urb->status == 0) { 1214 dev->net->stats.tx_packets += entry->packets; 1215 dev->net->stats.tx_bytes += entry->length; 1216 } else { 1217 dev->net->stats.tx_errors++; 1218 1219 switch (urb->status) { 1220 case -EPIPE: 1221 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1222 break; 1223 1224 /* software-driven interface shutdown */ 1225 case -ECONNRESET: // async unlink 1226 case -ESHUTDOWN: // hardware gone 1227 break; 1228 1229 /* like rx, tx gets controller i/o faults during hub_wq 1230 * delays and so it uses the same throttling mechanism. 1231 */ 1232 case -EPROTO: 1233 case -ETIME: 1234 case -EILSEQ: 1235 usb_mark_last_busy(dev->udev); 1236 if (!timer_pending (&dev->delay)) { 1237 mod_timer (&dev->delay, 1238 jiffies + THROTTLE_JIFFIES); 1239 netif_dbg(dev, link, dev->net, 1240 "tx throttle %d\n", urb->status); 1241 } 1242 netif_stop_queue (dev->net); 1243 break; 1244 default: 1245 netif_dbg(dev, tx_err, dev->net, 1246 "tx err %d\n", entry->urb->status); 1247 break; 1248 } 1249 } 1250 1251 usb_autopm_put_interface_async(dev->intf); 1252 (void) defer_bh(dev, skb, &dev->txq, tx_done); 1253 } 1254 1255 /*-------------------------------------------------------------------------*/ 1256 1257 void usbnet_tx_timeout (struct net_device *net) 1258 { 1259 struct usbnet *dev = netdev_priv(net); 1260 1261 unlink_urbs (dev, &dev->txq); 1262 tasklet_schedule (&dev->bh); 1263 /* this needs to be handled individually because the generic layer 1264 * doesn't know what is sufficient and could not restore private 1265 * information if a remedy of an unconditional reset were used. 1266 */ 1267 if (dev->driver_info->recover) 1268 (dev->driver_info->recover)(dev); 1269 } 1270 EXPORT_SYMBOL_GPL(usbnet_tx_timeout); 1271 1272 /*-------------------------------------------------------------------------*/ 1273 1274 static int build_dma_sg(const struct sk_buff *skb, struct urb *urb) 1275 { 1276 unsigned num_sgs, total_len = 0; 1277 int i, s = 0; 1278 1279 num_sgs = skb_shinfo(skb)->nr_frags + 1; 1280 if (num_sgs == 1) 1281 return 0; 1282 1283 /* reserve one for zero packet */ 1284 urb->sg = kmalloc((num_sgs + 1) * sizeof(struct scatterlist), 1285 GFP_ATOMIC); 1286 if (!urb->sg) 1287 return -ENOMEM; 1288 1289 urb->num_sgs = num_sgs; 1290 sg_init_table(urb->sg, urb->num_sgs + 1); 1291 1292 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb)); 1293 total_len += skb_headlen(skb); 1294 1295 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1296 struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i]; 1297 1298 total_len += skb_frag_size(f); 1299 sg_set_page(&urb->sg[i + s], f->page.p, f->size, 1300 f->page_offset); 1301 } 1302 urb->transfer_buffer_length = total_len; 1303 1304 return 1; 1305 } 1306 1307 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, 1308 struct net_device *net) 1309 { 1310 struct usbnet *dev = netdev_priv(net); 1311 unsigned int length; 1312 struct urb *urb = NULL; 1313 struct skb_data *entry; 1314 struct driver_info *info = dev->driver_info; 1315 unsigned long flags; 1316 int retval; 1317 1318 if (skb) 1319 skb_tx_timestamp(skb); 1320 1321 // some devices want funky USB-level framing, for 1322 // win32 driver (usually) and/or hardware quirks 1323 if (info->tx_fixup) { 1324 skb = info->tx_fixup (dev, skb, GFP_ATOMIC); 1325 if (!skb) { 1326 /* packet collected; minidriver waiting for more */ 1327 if (info->flags & FLAG_MULTI_PACKET) 1328 goto not_drop; 1329 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); 1330 goto drop; 1331 } 1332 } 1333 1334 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { 1335 netif_dbg(dev, tx_err, dev->net, "no urb\n"); 1336 goto drop; 1337 } 1338 1339 entry = (struct skb_data *) skb->cb; 1340 entry->urb = urb; 1341 entry->dev = dev; 1342 1343 usb_fill_bulk_urb (urb, dev->udev, dev->out, 1344 skb->data, skb->len, tx_complete, skb); 1345 if (dev->can_dma_sg) { 1346 if (build_dma_sg(skb, urb) < 0) 1347 goto drop; 1348 } 1349 length = urb->transfer_buffer_length; 1350 1351 /* don't assume the hardware handles USB_ZERO_PACKET 1352 * NOTE: strictly conforming cdc-ether devices should expect 1353 * the ZLP here, but ignore the one-byte packet. 1354 * NOTE2: CDC NCM specification is different from CDC ECM when 1355 * handling ZLP/short packets, so cdc_ncm driver will make short 1356 * packet itself if needed. 1357 */ 1358 if (length % dev->maxpacket == 0) { 1359 if (!(info->flags & FLAG_SEND_ZLP)) { 1360 if (!(info->flags & FLAG_MULTI_PACKET)) { 1361 length++; 1362 if (skb_tailroom(skb) && !urb->num_sgs) { 1363 skb->data[skb->len] = 0; 1364 __skb_put(skb, 1); 1365 } else if (urb->num_sgs) 1366 sg_set_buf(&urb->sg[urb->num_sgs++], 1367 dev->padding_pkt, 1); 1368 } 1369 } else 1370 urb->transfer_flags |= URB_ZERO_PACKET; 1371 } 1372 urb->transfer_buffer_length = length; 1373 1374 if (info->flags & FLAG_MULTI_PACKET) { 1375 /* Driver has set number of packets and a length delta. 1376 * Calculate the complete length and ensure that it's 1377 * positive. 1378 */ 1379 entry->length += length; 1380 if (WARN_ON_ONCE(entry->length <= 0)) 1381 entry->length = length; 1382 } else { 1383 usbnet_set_skb_tx_stats(skb, 1, length); 1384 } 1385 1386 spin_lock_irqsave(&dev->txq.lock, flags); 1387 retval = usb_autopm_get_interface_async(dev->intf); 1388 if (retval < 0) { 1389 spin_unlock_irqrestore(&dev->txq.lock, flags); 1390 goto drop; 1391 } 1392 1393 #ifdef CONFIG_PM 1394 /* if this triggers the device is still a sleep */ 1395 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { 1396 /* transmission will be done in resume */ 1397 usb_anchor_urb(urb, &dev->deferred); 1398 /* no use to process more packets */ 1399 netif_stop_queue(net); 1400 usb_put_urb(urb); 1401 spin_unlock_irqrestore(&dev->txq.lock, flags); 1402 netdev_dbg(dev->net, "Delaying transmission for resumption\n"); 1403 goto deferred; 1404 } 1405 #endif 1406 1407 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { 1408 case -EPIPE: 1409 netif_stop_queue (net); 1410 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1411 usb_autopm_put_interface_async(dev->intf); 1412 break; 1413 default: 1414 usb_autopm_put_interface_async(dev->intf); 1415 netif_dbg(dev, tx_err, dev->net, 1416 "tx: submit urb err %d\n", retval); 1417 break; 1418 case 0: 1419 netif_trans_update(net); 1420 __usbnet_queue_skb(&dev->txq, skb, tx_start); 1421 if (dev->txq.qlen >= TX_QLEN (dev)) 1422 netif_stop_queue (net); 1423 } 1424 spin_unlock_irqrestore (&dev->txq.lock, flags); 1425 1426 if (retval) { 1427 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); 1428 drop: 1429 dev->net->stats.tx_dropped++; 1430 not_drop: 1431 if (skb) 1432 dev_kfree_skb_any (skb); 1433 if (urb) { 1434 kfree(urb->sg); 1435 usb_free_urb(urb); 1436 } 1437 } else 1438 netif_dbg(dev, tx_queued, dev->net, 1439 "> tx, len %u, type 0x%x\n", length, skb->protocol); 1440 #ifdef CONFIG_PM 1441 deferred: 1442 #endif 1443 return NETDEV_TX_OK; 1444 } 1445 EXPORT_SYMBOL_GPL(usbnet_start_xmit); 1446 1447 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags) 1448 { 1449 struct urb *urb; 1450 int i; 1451 int ret = 0; 1452 1453 /* don't refill the queue all at once */ 1454 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) { 1455 urb = usb_alloc_urb(0, flags); 1456 if (urb != NULL) { 1457 ret = rx_submit(dev, urb, flags); 1458 if (ret) 1459 goto err; 1460 } else { 1461 ret = -ENOMEM; 1462 goto err; 1463 } 1464 } 1465 err: 1466 return ret; 1467 } 1468 1469 /*-------------------------------------------------------------------------*/ 1470 1471 // tasklet (work deferred from completions, in_irq) or timer 1472 1473 static void usbnet_bh (unsigned long param) 1474 { 1475 struct usbnet *dev = (struct usbnet *) param; 1476 struct sk_buff *skb; 1477 struct skb_data *entry; 1478 1479 while ((skb = skb_dequeue (&dev->done))) { 1480 entry = (struct skb_data *) skb->cb; 1481 switch (entry->state) { 1482 case rx_done: 1483 entry->state = rx_cleanup; 1484 rx_process (dev, skb); 1485 continue; 1486 case tx_done: 1487 kfree(entry->urb->sg); 1488 case rx_cleanup: 1489 usb_free_urb (entry->urb); 1490 dev_kfree_skb (skb); 1491 continue; 1492 default: 1493 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); 1494 } 1495 } 1496 1497 /* restart RX again after disabling due to high error rate */ 1498 clear_bit(EVENT_RX_KILL, &dev->flags); 1499 1500 /* waiting for all pending urbs to complete? 1501 * only then can we forgo submitting anew 1502 */ 1503 if (waitqueue_active(&dev->wait)) { 1504 if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0) 1505 wake_up_all(&dev->wait); 1506 1507 // or are we maybe short a few urbs? 1508 } else if (netif_running (dev->net) && 1509 netif_device_present (dev->net) && 1510 netif_carrier_ok(dev->net) && 1511 !timer_pending(&dev->delay) && 1512 !test_bit(EVENT_RX_PAUSED, &dev->flags) && 1513 !test_bit(EVENT_RX_HALT, &dev->flags)) { 1514 int temp = dev->rxq.qlen; 1515 1516 if (temp < RX_QLEN(dev)) { 1517 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK) 1518 return; 1519 if (temp != dev->rxq.qlen) 1520 netif_dbg(dev, link, dev->net, 1521 "rxqlen %d --> %d\n", 1522 temp, dev->rxq.qlen); 1523 if (dev->rxq.qlen < RX_QLEN(dev)) 1524 tasklet_schedule (&dev->bh); 1525 } 1526 if (dev->txq.qlen < TX_QLEN (dev)) 1527 netif_wake_queue (dev->net); 1528 } 1529 } 1530 1531 1532 /*------------------------------------------------------------------------- 1533 * 1534 * USB Device Driver support 1535 * 1536 *-------------------------------------------------------------------------*/ 1537 1538 // precondition: never called in_interrupt 1539 1540 void usbnet_disconnect (struct usb_interface *intf) 1541 { 1542 struct usbnet *dev; 1543 struct usb_device *xdev; 1544 struct net_device *net; 1545 1546 dev = usb_get_intfdata(intf); 1547 usb_set_intfdata(intf, NULL); 1548 if (!dev) 1549 return; 1550 1551 xdev = interface_to_usbdev (intf); 1552 1553 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", 1554 intf->dev.driver->name, 1555 xdev->bus->bus_name, xdev->devpath, 1556 dev->driver_info->description); 1557 1558 net = dev->net; 1559 unregister_netdev (net); 1560 1561 cancel_work_sync(&dev->kevent); 1562 1563 usb_scuttle_anchored_urbs(&dev->deferred); 1564 1565 if (dev->driver_info->unbind) 1566 dev->driver_info->unbind (dev, intf); 1567 1568 usb_kill_urb(dev->interrupt); 1569 usb_free_urb(dev->interrupt); 1570 kfree(dev->padding_pkt); 1571 1572 free_netdev(net); 1573 } 1574 EXPORT_SYMBOL_GPL(usbnet_disconnect); 1575 1576 static const struct net_device_ops usbnet_netdev_ops = { 1577 .ndo_open = usbnet_open, 1578 .ndo_stop = usbnet_stop, 1579 .ndo_start_xmit = usbnet_start_xmit, 1580 .ndo_tx_timeout = usbnet_tx_timeout, 1581 .ndo_set_rx_mode = usbnet_set_rx_mode, 1582 .ndo_change_mtu = usbnet_change_mtu, 1583 .ndo_set_mac_address = eth_mac_addr, 1584 .ndo_validate_addr = eth_validate_addr, 1585 }; 1586 1587 /*-------------------------------------------------------------------------*/ 1588 1589 // precondition: never called in_interrupt 1590 1591 static struct device_type wlan_type = { 1592 .name = "wlan", 1593 }; 1594 1595 static struct device_type wwan_type = { 1596 .name = "wwan", 1597 }; 1598 1599 int 1600 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) 1601 { 1602 struct usbnet *dev; 1603 struct net_device *net; 1604 struct usb_host_interface *interface; 1605 struct driver_info *info; 1606 struct usb_device *xdev; 1607 int status; 1608 const char *name; 1609 struct usb_driver *driver = to_usb_driver(udev->dev.driver); 1610 1611 /* usbnet already took usb runtime pm, so have to enable the feature 1612 * for usb interface, otherwise usb_autopm_get_interface may return 1613 * failure if RUNTIME_PM is enabled. 1614 */ 1615 if (!driver->supports_autosuspend) { 1616 driver->supports_autosuspend = 1; 1617 pm_runtime_enable(&udev->dev); 1618 } 1619 1620 name = udev->dev.driver->name; 1621 info = (struct driver_info *) prod->driver_info; 1622 if (!info) { 1623 dev_dbg (&udev->dev, "blacklisted by %s\n", name); 1624 return -ENODEV; 1625 } 1626 xdev = interface_to_usbdev (udev); 1627 interface = udev->cur_altsetting; 1628 1629 status = -ENOMEM; 1630 1631 // set up our own records 1632 net = alloc_etherdev(sizeof(*dev)); 1633 if (!net) 1634 goto out; 1635 1636 /* netdev_printk() needs this so do it as early as possible */ 1637 SET_NETDEV_DEV(net, &udev->dev); 1638 1639 dev = netdev_priv(net); 1640 dev->udev = xdev; 1641 dev->intf = udev; 1642 dev->driver_info = info; 1643 dev->driver_name = name; 1644 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV 1645 | NETIF_MSG_PROBE | NETIF_MSG_LINK); 1646 init_waitqueue_head(&dev->wait); 1647 skb_queue_head_init (&dev->rxq); 1648 skb_queue_head_init (&dev->txq); 1649 skb_queue_head_init (&dev->done); 1650 skb_queue_head_init(&dev->rxq_pause); 1651 dev->bh.func = usbnet_bh; 1652 dev->bh.data = (unsigned long) dev; 1653 INIT_WORK (&dev->kevent, usbnet_deferred_kevent); 1654 init_usb_anchor(&dev->deferred); 1655 dev->delay.function = usbnet_bh; 1656 dev->delay.data = (unsigned long) dev; 1657 init_timer (&dev->delay); 1658 mutex_init (&dev->phy_mutex); 1659 mutex_init(&dev->interrupt_mutex); 1660 dev->interrupt_count = 0; 1661 1662 dev->net = net; 1663 strcpy (net->name, "usb%d"); 1664 memcpy (net->dev_addr, node_id, sizeof node_id); 1665 1666 /* rx and tx sides can use different message sizes; 1667 * bind() should set rx_urb_size in that case. 1668 */ 1669 dev->hard_mtu = net->mtu + net->hard_header_len; 1670 net->min_mtu = 0; 1671 net->max_mtu = ETH_MAX_MTU; 1672 1673 net->netdev_ops = &usbnet_netdev_ops; 1674 net->watchdog_timeo = TX_TIMEOUT_JIFFIES; 1675 net->ethtool_ops = &usbnet_ethtool_ops; 1676 1677 // allow device-specific bind/init procedures 1678 // NOTE net->name still not usable ... 1679 if (info->bind) { 1680 status = info->bind (dev, udev); 1681 if (status < 0) 1682 goto out1; 1683 1684 // heuristic: "usb%d" for links we know are two-host, 1685 // else "eth%d" when there's reasonable doubt. userspace 1686 // can rename the link if it knows better. 1687 if ((dev->driver_info->flags & FLAG_ETHER) != 0 && 1688 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 || 1689 (net->dev_addr [0] & 0x02) == 0)) 1690 strcpy (net->name, "eth%d"); 1691 /* WLAN devices should always be named "wlan%d" */ 1692 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1693 strcpy(net->name, "wlan%d"); 1694 /* WWAN devices should always be named "wwan%d" */ 1695 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1696 strcpy(net->name, "wwan%d"); 1697 1698 /* devices that cannot do ARP */ 1699 if ((dev->driver_info->flags & FLAG_NOARP) != 0) 1700 net->flags |= IFF_NOARP; 1701 1702 /* maybe the remote can't receive an Ethernet MTU */ 1703 if (net->mtu > (dev->hard_mtu - net->hard_header_len)) 1704 net->mtu = dev->hard_mtu - net->hard_header_len; 1705 } else if (!info->in || !info->out) 1706 status = usbnet_get_endpoints (dev, udev); 1707 else { 1708 dev->in = usb_rcvbulkpipe (xdev, info->in); 1709 dev->out = usb_sndbulkpipe (xdev, info->out); 1710 if (!(info->flags & FLAG_NO_SETINT)) 1711 status = usb_set_interface (xdev, 1712 interface->desc.bInterfaceNumber, 1713 interface->desc.bAlternateSetting); 1714 else 1715 status = 0; 1716 1717 } 1718 if (status >= 0 && dev->status) 1719 status = init_status (dev, udev); 1720 if (status < 0) 1721 goto out3; 1722 1723 if (!dev->rx_urb_size) 1724 dev->rx_urb_size = dev->hard_mtu; 1725 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); 1726 1727 /* let userspace know we have a random address */ 1728 if (ether_addr_equal(net->dev_addr, node_id)) 1729 net->addr_assign_type = NET_ADDR_RANDOM; 1730 1731 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1732 SET_NETDEV_DEVTYPE(net, &wlan_type); 1733 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1734 SET_NETDEV_DEVTYPE(net, &wwan_type); 1735 1736 /* initialize max rx_qlen and tx_qlen */ 1737 usbnet_update_max_qlen(dev); 1738 1739 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) && 1740 !(info->flags & FLAG_MULTI_PACKET)) { 1741 dev->padding_pkt = kzalloc(1, GFP_KERNEL); 1742 if (!dev->padding_pkt) { 1743 status = -ENOMEM; 1744 goto out4; 1745 } 1746 } 1747 1748 status = register_netdev (net); 1749 if (status) 1750 goto out5; 1751 netif_info(dev, probe, dev->net, 1752 "register '%s' at usb-%s-%s, %s, %pM\n", 1753 udev->dev.driver->name, 1754 xdev->bus->bus_name, xdev->devpath, 1755 dev->driver_info->description, 1756 net->dev_addr); 1757 1758 // ok, it's ready to go. 1759 usb_set_intfdata (udev, dev); 1760 1761 netif_device_attach (net); 1762 1763 if (dev->driver_info->flags & FLAG_LINK_INTR) 1764 usbnet_link_change(dev, 0, 0); 1765 1766 return 0; 1767 1768 out5: 1769 kfree(dev->padding_pkt); 1770 out4: 1771 usb_free_urb(dev->interrupt); 1772 out3: 1773 if (info->unbind) 1774 info->unbind (dev, udev); 1775 out1: 1776 /* subdrivers must undo all they did in bind() if they 1777 * fail it, but we may fail later and a deferred kevent 1778 * may trigger an error resubmitting itself and, worse, 1779 * schedule a timer. So we kill it all just in case. 1780 */ 1781 cancel_work_sync(&dev->kevent); 1782 del_timer_sync(&dev->delay); 1783 free_netdev(net); 1784 out: 1785 return status; 1786 } 1787 EXPORT_SYMBOL_GPL(usbnet_probe); 1788 1789 /*-------------------------------------------------------------------------*/ 1790 1791 /* 1792 * suspend the whole driver as soon as the first interface is suspended 1793 * resume only when the last interface is resumed 1794 */ 1795 1796 int usbnet_suspend (struct usb_interface *intf, pm_message_t message) 1797 { 1798 struct usbnet *dev = usb_get_intfdata(intf); 1799 1800 if (!dev->suspend_count++) { 1801 spin_lock_irq(&dev->txq.lock); 1802 /* don't autosuspend while transmitting */ 1803 if (dev->txq.qlen && PMSG_IS_AUTO(message)) { 1804 dev->suspend_count--; 1805 spin_unlock_irq(&dev->txq.lock); 1806 return -EBUSY; 1807 } else { 1808 set_bit(EVENT_DEV_ASLEEP, &dev->flags); 1809 spin_unlock_irq(&dev->txq.lock); 1810 } 1811 /* 1812 * accelerate emptying of the rx and queues, to avoid 1813 * having everything error out. 1814 */ 1815 netif_device_detach (dev->net); 1816 usbnet_terminate_urbs(dev); 1817 __usbnet_status_stop_force(dev); 1818 1819 /* 1820 * reattach so runtime management can use and 1821 * wake the device 1822 */ 1823 netif_device_attach (dev->net); 1824 } 1825 return 0; 1826 } 1827 EXPORT_SYMBOL_GPL(usbnet_suspend); 1828 1829 int usbnet_resume (struct usb_interface *intf) 1830 { 1831 struct usbnet *dev = usb_get_intfdata(intf); 1832 struct sk_buff *skb; 1833 struct urb *res; 1834 int retval; 1835 1836 if (!--dev->suspend_count) { 1837 /* resume interrupt URB if it was previously submitted */ 1838 __usbnet_status_start_force(dev, GFP_NOIO); 1839 1840 spin_lock_irq(&dev->txq.lock); 1841 while ((res = usb_get_from_anchor(&dev->deferred))) { 1842 1843 skb = (struct sk_buff *)res->context; 1844 retval = usb_submit_urb(res, GFP_ATOMIC); 1845 if (retval < 0) { 1846 dev_kfree_skb_any(skb); 1847 kfree(res->sg); 1848 usb_free_urb(res); 1849 usb_autopm_put_interface_async(dev->intf); 1850 } else { 1851 netif_trans_update(dev->net); 1852 __skb_queue_tail(&dev->txq, skb); 1853 } 1854 } 1855 1856 smp_mb(); 1857 clear_bit(EVENT_DEV_ASLEEP, &dev->flags); 1858 spin_unlock_irq(&dev->txq.lock); 1859 1860 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) { 1861 /* handle remote wakeup ASAP 1862 * we cannot race against stop 1863 */ 1864 if (netif_device_present(dev->net) && 1865 !timer_pending(&dev->delay) && 1866 !test_bit(EVENT_RX_HALT, &dev->flags)) 1867 rx_alloc_submit(dev, GFP_NOIO); 1868 1869 if (!(dev->txq.qlen >= TX_QLEN(dev))) 1870 netif_tx_wake_all_queues(dev->net); 1871 tasklet_schedule (&dev->bh); 1872 } 1873 } 1874 1875 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) 1876 usb_autopm_get_interface_no_resume(intf); 1877 1878 return 0; 1879 } 1880 EXPORT_SYMBOL_GPL(usbnet_resume); 1881 1882 /* 1883 * Either a subdriver implements manage_power, then it is assumed to always 1884 * be ready to be suspended or it reports the readiness to be suspended 1885 * explicitly 1886 */ 1887 void usbnet_device_suggests_idle(struct usbnet *dev) 1888 { 1889 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) { 1890 dev->intf->needs_remote_wakeup = 1; 1891 usb_autopm_put_interface_async(dev->intf); 1892 } 1893 } 1894 EXPORT_SYMBOL(usbnet_device_suggests_idle); 1895 1896 /* 1897 * For devices that can do without special commands 1898 */ 1899 int usbnet_manage_power(struct usbnet *dev, int on) 1900 { 1901 dev->intf->needs_remote_wakeup = on; 1902 return 0; 1903 } 1904 EXPORT_SYMBOL(usbnet_manage_power); 1905 1906 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset) 1907 { 1908 /* update link after link is reseted */ 1909 if (link && !need_reset) 1910 netif_carrier_on(dev->net); 1911 else 1912 netif_carrier_off(dev->net); 1913 1914 if (need_reset && link) 1915 usbnet_defer_kevent(dev, EVENT_LINK_RESET); 1916 else 1917 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE); 1918 } 1919 EXPORT_SYMBOL(usbnet_link_change); 1920 1921 /*-------------------------------------------------------------------------*/ 1922 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1923 u16 value, u16 index, void *data, u16 size) 1924 { 1925 void *buf = NULL; 1926 int err = -ENOMEM; 1927 1928 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x" 1929 " value=0x%04x index=0x%04x size=%d\n", 1930 cmd, reqtype, value, index, size); 1931 1932 if (data) { 1933 buf = kmalloc(size, GFP_KERNEL); 1934 if (!buf) 1935 goto out; 1936 } 1937 1938 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), 1939 cmd, reqtype, value, index, buf, size, 1940 USB_CTRL_GET_TIMEOUT); 1941 if (err > 0 && err <= size) 1942 memcpy(data, buf, err); 1943 kfree(buf); 1944 out: 1945 return err; 1946 } 1947 1948 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1949 u16 value, u16 index, const void *data, 1950 u16 size) 1951 { 1952 void *buf = NULL; 1953 int err = -ENOMEM; 1954 1955 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 1956 " value=0x%04x index=0x%04x size=%d\n", 1957 cmd, reqtype, value, index, size); 1958 1959 if (data) { 1960 buf = kmemdup(data, size, GFP_KERNEL); 1961 if (!buf) 1962 goto out; 1963 } 1964 1965 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), 1966 cmd, reqtype, value, index, buf, size, 1967 USB_CTRL_SET_TIMEOUT); 1968 kfree(buf); 1969 1970 out: 1971 return err; 1972 } 1973 1974 /* 1975 * The function can't be called inside suspend/resume callback, 1976 * otherwise deadlock will be caused. 1977 */ 1978 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1979 u16 value, u16 index, void *data, u16 size) 1980 { 1981 int ret; 1982 1983 if (usb_autopm_get_interface(dev->intf) < 0) 1984 return -ENODEV; 1985 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index, 1986 data, size); 1987 usb_autopm_put_interface(dev->intf); 1988 return ret; 1989 } 1990 EXPORT_SYMBOL_GPL(usbnet_read_cmd); 1991 1992 /* 1993 * The function can't be called inside suspend/resume callback, 1994 * otherwise deadlock will be caused. 1995 */ 1996 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1997 u16 value, u16 index, const void *data, u16 size) 1998 { 1999 int ret; 2000 2001 if (usb_autopm_get_interface(dev->intf) < 0) 2002 return -ENODEV; 2003 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index, 2004 data, size); 2005 usb_autopm_put_interface(dev->intf); 2006 return ret; 2007 } 2008 EXPORT_SYMBOL_GPL(usbnet_write_cmd); 2009 2010 /* 2011 * The function can be called inside suspend/resume callback safely 2012 * and should only be called by suspend/resume callback generally. 2013 */ 2014 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 2015 u16 value, u16 index, void *data, u16 size) 2016 { 2017 return __usbnet_read_cmd(dev, cmd, reqtype, value, index, 2018 data, size); 2019 } 2020 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm); 2021 2022 /* 2023 * The function can be called inside suspend/resume callback safely 2024 * and should only be called by suspend/resume callback generally. 2025 */ 2026 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 2027 u16 value, u16 index, const void *data, 2028 u16 size) 2029 { 2030 return __usbnet_write_cmd(dev, cmd, reqtype, value, index, 2031 data, size); 2032 } 2033 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm); 2034 2035 static void usbnet_async_cmd_cb(struct urb *urb) 2036 { 2037 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context; 2038 int status = urb->status; 2039 2040 if (status < 0) 2041 dev_dbg(&urb->dev->dev, "%s failed with %d", 2042 __func__, status); 2043 2044 kfree(req); 2045 usb_free_urb(urb); 2046 } 2047 2048 /* 2049 * The caller must make sure that device can't be put into suspend 2050 * state until the control URB completes. 2051 */ 2052 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype, 2053 u16 value, u16 index, const void *data, u16 size) 2054 { 2055 struct usb_ctrlrequest *req = NULL; 2056 struct urb *urb; 2057 int err = -ENOMEM; 2058 void *buf = NULL; 2059 2060 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 2061 " value=0x%04x index=0x%04x size=%d\n", 2062 cmd, reqtype, value, index, size); 2063 2064 urb = usb_alloc_urb(0, GFP_ATOMIC); 2065 if (!urb) 2066 goto fail; 2067 2068 if (data) { 2069 buf = kmemdup(data, size, GFP_ATOMIC); 2070 if (!buf) { 2071 netdev_err(dev->net, "Error allocating buffer" 2072 " in %s!\n", __func__); 2073 goto fail_free; 2074 } 2075 } 2076 2077 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC); 2078 if (!req) 2079 goto fail_free_buf; 2080 2081 req->bRequestType = reqtype; 2082 req->bRequest = cmd; 2083 req->wValue = cpu_to_le16(value); 2084 req->wIndex = cpu_to_le16(index); 2085 req->wLength = cpu_to_le16(size); 2086 2087 usb_fill_control_urb(urb, dev->udev, 2088 usb_sndctrlpipe(dev->udev, 0), 2089 (void *)req, buf, size, 2090 usbnet_async_cmd_cb, req); 2091 urb->transfer_flags |= URB_FREE_BUFFER; 2092 2093 err = usb_submit_urb(urb, GFP_ATOMIC); 2094 if (err < 0) { 2095 netdev_err(dev->net, "Error submitting the control" 2096 " message: status=%d\n", err); 2097 goto fail_free; 2098 } 2099 return 0; 2100 2101 fail_free_buf: 2102 kfree(buf); 2103 fail_free: 2104 kfree(req); 2105 usb_free_urb(urb); 2106 fail: 2107 return err; 2108 2109 } 2110 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async); 2111 /*-------------------------------------------------------------------------*/ 2112 2113 static int __init usbnet_init(void) 2114 { 2115 /* Compiler should optimize this out. */ 2116 BUILD_BUG_ON( 2117 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data)); 2118 2119 eth_random_addr(node_id); 2120 return 0; 2121 } 2122 module_init(usbnet_init); 2123 2124 static void __exit usbnet_exit(void) 2125 { 2126 } 2127 module_exit(usbnet_exit); 2128 2129 MODULE_AUTHOR("David Brownell"); 2130 MODULE_DESCRIPTION("USB network driver framework"); 2131 MODULE_LICENSE("GPL"); 2132