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, i; 164 unsigned char buf [13]; 165 166 tmp = usb_string(dev->udev, iMACAddress, buf, sizeof buf); 167 if (tmp != 12) { 168 dev_dbg(&dev->udev->dev, 169 "bad MAC string %d fetch, %d\n", iMACAddress, tmp); 170 if (tmp >= 0) 171 tmp = -EINVAL; 172 return tmp; 173 } 174 for (i = tmp = 0; i < 6; i++, tmp += 2) 175 dev->net->dev_addr [i] = 176 (hex_to_bin(buf[tmp]) << 4) + hex_to_bin(buf[tmp + 1]); 177 return 0; 178 } 179 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr); 180 181 static void intr_complete (struct urb *urb) 182 { 183 struct usbnet *dev = urb->context; 184 int status = urb->status; 185 186 switch (status) { 187 /* success */ 188 case 0: 189 dev->driver_info->status(dev, urb); 190 break; 191 192 /* software-driven interface shutdown */ 193 case -ENOENT: /* urb killed */ 194 case -ESHUTDOWN: /* hardware gone */ 195 netif_dbg(dev, ifdown, dev->net, 196 "intr shutdown, code %d\n", status); 197 return; 198 199 /* NOTE: not throttling like RX/TX, since this endpoint 200 * already polls infrequently 201 */ 202 default: 203 netdev_dbg(dev->net, "intr status %d\n", status); 204 break; 205 } 206 207 status = usb_submit_urb (urb, GFP_ATOMIC); 208 if (status != 0) 209 netif_err(dev, timer, dev->net, 210 "intr resubmit --> %d\n", status); 211 } 212 213 static int init_status (struct usbnet *dev, struct usb_interface *intf) 214 { 215 char *buf = NULL; 216 unsigned pipe = 0; 217 unsigned maxp; 218 unsigned period; 219 220 if (!dev->driver_info->status) 221 return 0; 222 223 pipe = usb_rcvintpipe (dev->udev, 224 dev->status->desc.bEndpointAddress 225 & USB_ENDPOINT_NUMBER_MASK); 226 maxp = usb_maxpacket (dev->udev, pipe, 0); 227 228 /* avoid 1 msec chatter: min 8 msec poll rate */ 229 period = max ((int) dev->status->desc.bInterval, 230 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3); 231 232 buf = kmalloc (maxp, GFP_KERNEL); 233 if (buf) { 234 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL); 235 if (!dev->interrupt) { 236 kfree (buf); 237 return -ENOMEM; 238 } else { 239 usb_fill_int_urb(dev->interrupt, dev->udev, pipe, 240 buf, maxp, intr_complete, dev, period); 241 dev->interrupt->transfer_flags |= URB_FREE_BUFFER; 242 dev_dbg(&intf->dev, 243 "status ep%din, %d bytes period %d\n", 244 usb_pipeendpoint(pipe), maxp, period); 245 } 246 } 247 return 0; 248 } 249 250 /* Submit the interrupt URB if not previously submitted, increasing refcount */ 251 int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags) 252 { 253 int ret = 0; 254 255 WARN_ON_ONCE(dev->interrupt == NULL); 256 if (dev->interrupt) { 257 mutex_lock(&dev->interrupt_mutex); 258 259 if (++dev->interrupt_count == 1) 260 ret = usb_submit_urb(dev->interrupt, mem_flags); 261 262 dev_dbg(&dev->udev->dev, "incremented interrupt URB count to %d\n", 263 dev->interrupt_count); 264 mutex_unlock(&dev->interrupt_mutex); 265 } 266 return ret; 267 } 268 EXPORT_SYMBOL_GPL(usbnet_status_start); 269 270 /* For resume; submit interrupt URB if previously submitted */ 271 static int __usbnet_status_start_force(struct usbnet *dev, gfp_t mem_flags) 272 { 273 int ret = 0; 274 275 mutex_lock(&dev->interrupt_mutex); 276 if (dev->interrupt_count) { 277 ret = usb_submit_urb(dev->interrupt, mem_flags); 278 dev_dbg(&dev->udev->dev, 279 "submitted interrupt URB for resume\n"); 280 } 281 mutex_unlock(&dev->interrupt_mutex); 282 return ret; 283 } 284 285 /* Kill the interrupt URB if all submitters want it killed */ 286 void usbnet_status_stop(struct usbnet *dev) 287 { 288 if (dev->interrupt) { 289 mutex_lock(&dev->interrupt_mutex); 290 WARN_ON(dev->interrupt_count == 0); 291 292 if (dev->interrupt_count && --dev->interrupt_count == 0) 293 usb_kill_urb(dev->interrupt); 294 295 dev_dbg(&dev->udev->dev, 296 "decremented interrupt URB count to %d\n", 297 dev->interrupt_count); 298 mutex_unlock(&dev->interrupt_mutex); 299 } 300 } 301 EXPORT_SYMBOL_GPL(usbnet_status_stop); 302 303 /* For suspend; always kill interrupt URB */ 304 static void __usbnet_status_stop_force(struct usbnet *dev) 305 { 306 if (dev->interrupt) { 307 mutex_lock(&dev->interrupt_mutex); 308 usb_kill_urb(dev->interrupt); 309 dev_dbg(&dev->udev->dev, "killed interrupt URB for suspend\n"); 310 mutex_unlock(&dev->interrupt_mutex); 311 } 312 } 313 314 /* Passes this packet up the stack, updating its accounting. 315 * Some link protocols batch packets, so their rx_fixup paths 316 * can return clones as well as just modify the original skb. 317 */ 318 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb) 319 { 320 int status; 321 322 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) { 323 skb_queue_tail(&dev->rxq_pause, skb); 324 return; 325 } 326 327 skb->protocol = eth_type_trans (skb, dev->net); 328 dev->net->stats.rx_packets++; 329 dev->net->stats.rx_bytes += skb->len; 330 331 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n", 332 skb->len + sizeof (struct ethhdr), skb->protocol); 333 memset (skb->cb, 0, sizeof (struct skb_data)); 334 335 if (skb_defer_rx_timestamp(skb)) 336 return; 337 338 status = netif_rx (skb); 339 if (status != NET_RX_SUCCESS) 340 netif_dbg(dev, rx_err, dev->net, 341 "netif_rx status %d\n", status); 342 } 343 EXPORT_SYMBOL_GPL(usbnet_skb_return); 344 345 /* must be called if hard_mtu or rx_urb_size changed */ 346 void usbnet_update_max_qlen(struct usbnet *dev) 347 { 348 enum usb_device_speed speed = dev->udev->speed; 349 350 switch (speed) { 351 case USB_SPEED_HIGH: 352 dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size; 353 dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu; 354 break; 355 case USB_SPEED_SUPER: 356 /* 357 * Not take default 5ms qlen for super speed HC to 358 * save memory, and iperf tests show 2.5ms qlen can 359 * work well 360 */ 361 dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size; 362 dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu; 363 break; 364 default: 365 dev->rx_qlen = dev->tx_qlen = 4; 366 } 367 } 368 EXPORT_SYMBOL_GPL(usbnet_update_max_qlen); 369 370 371 /*------------------------------------------------------------------------- 372 * 373 * Network Device Driver (peer link to "Host Device", from USB host) 374 * 375 *-------------------------------------------------------------------------*/ 376 377 int usbnet_change_mtu (struct net_device *net, int new_mtu) 378 { 379 struct usbnet *dev = netdev_priv(net); 380 int ll_mtu = new_mtu + net->hard_header_len; 381 int old_hard_mtu = dev->hard_mtu; 382 int old_rx_urb_size = dev->rx_urb_size; 383 384 if (new_mtu <= 0) 385 return -EINVAL; 386 // no second zero-length packet read wanted after mtu-sized packets 387 if ((ll_mtu % dev->maxpacket) == 0) 388 return -EDOM; 389 net->mtu = new_mtu; 390 391 dev->hard_mtu = net->mtu + net->hard_header_len; 392 if (dev->rx_urb_size == old_hard_mtu) { 393 dev->rx_urb_size = dev->hard_mtu; 394 if (dev->rx_urb_size > old_rx_urb_size) 395 usbnet_unlink_rx_urbs(dev); 396 } 397 398 /* max qlen depend on hard_mtu and rx_urb_size */ 399 usbnet_update_max_qlen(dev); 400 401 return 0; 402 } 403 EXPORT_SYMBOL_GPL(usbnet_change_mtu); 404 405 /* The caller must hold list->lock */ 406 static void __usbnet_queue_skb(struct sk_buff_head *list, 407 struct sk_buff *newsk, enum skb_state state) 408 { 409 struct skb_data *entry = (struct skb_data *) newsk->cb; 410 411 __skb_queue_tail(list, newsk); 412 entry->state = state; 413 } 414 415 /*-------------------------------------------------------------------------*/ 416 417 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from 418 * completion callbacks. 2.5 should have fixed those bugs... 419 */ 420 421 static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb, 422 struct sk_buff_head *list, enum skb_state state) 423 { 424 unsigned long flags; 425 enum skb_state old_state; 426 struct skb_data *entry = (struct skb_data *) skb->cb; 427 428 spin_lock_irqsave(&list->lock, flags); 429 old_state = entry->state; 430 entry->state = state; 431 __skb_unlink(skb, list); 432 spin_unlock(&list->lock); 433 spin_lock(&dev->done.lock); 434 __skb_queue_tail(&dev->done, skb); 435 if (dev->done.qlen == 1) 436 tasklet_schedule(&dev->bh); 437 spin_unlock_irqrestore(&dev->done.lock, flags); 438 return old_state; 439 } 440 441 /* some work can't be done in tasklets, so we use keventd 442 * 443 * NOTE: annoying asymmetry: if it's active, schedule_work() fails, 444 * but tasklet_schedule() doesn't. hope the failure is rare. 445 */ 446 void usbnet_defer_kevent (struct usbnet *dev, int work) 447 { 448 set_bit (work, &dev->flags); 449 if (!schedule_work (&dev->kevent)) { 450 if (net_ratelimit()) 451 netdev_err(dev->net, "kevent %d may have been dropped\n", work); 452 } else { 453 netdev_dbg(dev->net, "kevent %d scheduled\n", work); 454 } 455 } 456 EXPORT_SYMBOL_GPL(usbnet_defer_kevent); 457 458 /*-------------------------------------------------------------------------*/ 459 460 static void rx_complete (struct urb *urb); 461 462 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) 463 { 464 struct sk_buff *skb; 465 struct skb_data *entry; 466 int retval = 0; 467 unsigned long lockflags; 468 size_t size = dev->rx_urb_size; 469 470 /* prevent rx skb allocation when error ratio is high */ 471 if (test_bit(EVENT_RX_KILL, &dev->flags)) { 472 usb_free_urb(urb); 473 return -ENOLINK; 474 } 475 476 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags); 477 if (!skb) { 478 netif_dbg(dev, rx_err, dev->net, "no rx skb\n"); 479 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 480 usb_free_urb (urb); 481 return -ENOMEM; 482 } 483 484 entry = (struct skb_data *) skb->cb; 485 entry->urb = urb; 486 entry->dev = dev; 487 entry->length = 0; 488 489 usb_fill_bulk_urb (urb, dev->udev, dev->in, 490 skb->data, size, rx_complete, skb); 491 492 spin_lock_irqsave (&dev->rxq.lock, lockflags); 493 494 if (netif_running (dev->net) && 495 netif_device_present (dev->net) && 496 !test_bit (EVENT_RX_HALT, &dev->flags) && 497 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) { 498 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) { 499 case -EPIPE: 500 usbnet_defer_kevent (dev, EVENT_RX_HALT); 501 break; 502 case -ENOMEM: 503 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 504 break; 505 case -ENODEV: 506 netif_dbg(dev, ifdown, dev->net, "device gone\n"); 507 netif_device_detach (dev->net); 508 break; 509 case -EHOSTUNREACH: 510 retval = -ENOLINK; 511 break; 512 default: 513 netif_dbg(dev, rx_err, dev->net, 514 "rx submit, %d\n", retval); 515 tasklet_schedule (&dev->bh); 516 break; 517 case 0: 518 __usbnet_queue_skb(&dev->rxq, skb, rx_start); 519 } 520 } else { 521 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n"); 522 retval = -ENOLINK; 523 } 524 spin_unlock_irqrestore (&dev->rxq.lock, lockflags); 525 if (retval) { 526 dev_kfree_skb_any (skb); 527 usb_free_urb (urb); 528 } 529 return retval; 530 } 531 532 533 /*-------------------------------------------------------------------------*/ 534 535 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb) 536 { 537 if (dev->driver_info->rx_fixup && 538 !dev->driver_info->rx_fixup (dev, skb)) { 539 /* With RX_ASSEMBLE, rx_fixup() must update counters */ 540 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE)) 541 dev->net->stats.rx_errors++; 542 goto done; 543 } 544 // else network stack removes extra byte if we forced a short packet 545 546 /* all data was already cloned from skb inside the driver */ 547 if (dev->driver_info->flags & FLAG_MULTI_PACKET) 548 goto done; 549 550 if (skb->len < ETH_HLEN) { 551 dev->net->stats.rx_errors++; 552 dev->net->stats.rx_length_errors++; 553 netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len); 554 } else { 555 usbnet_skb_return(dev, skb); 556 return; 557 } 558 559 done: 560 skb_queue_tail(&dev->done, skb); 561 } 562 563 /*-------------------------------------------------------------------------*/ 564 565 static void rx_complete (struct urb *urb) 566 { 567 struct sk_buff *skb = (struct sk_buff *) urb->context; 568 struct skb_data *entry = (struct skb_data *) skb->cb; 569 struct usbnet *dev = entry->dev; 570 int urb_status = urb->status; 571 enum skb_state state; 572 573 skb_put (skb, urb->actual_length); 574 state = rx_done; 575 entry->urb = NULL; 576 577 switch (urb_status) { 578 /* success */ 579 case 0: 580 break; 581 582 /* stalls need manual reset. this is rare ... except that 583 * when going through USB 2.0 TTs, unplug appears this way. 584 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ 585 * storm, recovering as needed. 586 */ 587 case -EPIPE: 588 dev->net->stats.rx_errors++; 589 usbnet_defer_kevent (dev, EVENT_RX_HALT); 590 // FALLTHROUGH 591 592 /* software-driven interface shutdown */ 593 case -ECONNRESET: /* async unlink */ 594 case -ESHUTDOWN: /* hardware gone */ 595 netif_dbg(dev, ifdown, dev->net, 596 "rx shutdown, code %d\n", urb_status); 597 goto block; 598 599 /* we get controller i/o faults during hub_wq disconnect() delays. 600 * throttle down resubmits, to avoid log floods; just temporarily, 601 * so we still recover when the fault isn't a hub_wq delay. 602 */ 603 case -EPROTO: 604 case -ETIME: 605 case -EILSEQ: 606 dev->net->stats.rx_errors++; 607 if (!timer_pending (&dev->delay)) { 608 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); 609 netif_dbg(dev, link, dev->net, 610 "rx throttle %d\n", urb_status); 611 } 612 block: 613 state = rx_cleanup; 614 entry->urb = urb; 615 urb = NULL; 616 break; 617 618 /* data overrun ... flush fifo? */ 619 case -EOVERFLOW: 620 dev->net->stats.rx_over_errors++; 621 // FALLTHROUGH 622 623 default: 624 state = rx_cleanup; 625 dev->net->stats.rx_errors++; 626 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status); 627 break; 628 } 629 630 /* stop rx if packet error rate is high */ 631 if (++dev->pkt_cnt > 30) { 632 dev->pkt_cnt = 0; 633 dev->pkt_err = 0; 634 } else { 635 if (state == rx_cleanup) 636 dev->pkt_err++; 637 if (dev->pkt_err > 20) 638 set_bit(EVENT_RX_KILL, &dev->flags); 639 } 640 641 state = defer_bh(dev, skb, &dev->rxq, state); 642 643 if (urb) { 644 if (netif_running (dev->net) && 645 !test_bit (EVENT_RX_HALT, &dev->flags) && 646 state != unlink_start) { 647 rx_submit (dev, urb, GFP_ATOMIC); 648 usb_mark_last_busy(dev->udev); 649 return; 650 } 651 usb_free_urb (urb); 652 } 653 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n"); 654 } 655 656 /*-------------------------------------------------------------------------*/ 657 void usbnet_pause_rx(struct usbnet *dev) 658 { 659 set_bit(EVENT_RX_PAUSED, &dev->flags); 660 661 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n"); 662 } 663 EXPORT_SYMBOL_GPL(usbnet_pause_rx); 664 665 void usbnet_resume_rx(struct usbnet *dev) 666 { 667 struct sk_buff *skb; 668 int num = 0; 669 670 clear_bit(EVENT_RX_PAUSED, &dev->flags); 671 672 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) { 673 usbnet_skb_return(dev, skb); 674 num++; 675 } 676 677 tasklet_schedule(&dev->bh); 678 679 netif_dbg(dev, rx_status, dev->net, 680 "paused rx queue disabled, %d skbs requeued\n", num); 681 } 682 EXPORT_SYMBOL_GPL(usbnet_resume_rx); 683 684 void usbnet_purge_paused_rxq(struct usbnet *dev) 685 { 686 skb_queue_purge(&dev->rxq_pause); 687 } 688 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq); 689 690 /*-------------------------------------------------------------------------*/ 691 692 // unlink pending rx/tx; completion handlers do all other cleanup 693 694 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) 695 { 696 unsigned long flags; 697 struct sk_buff *skb; 698 int count = 0; 699 700 spin_lock_irqsave (&q->lock, flags); 701 while (!skb_queue_empty(q)) { 702 struct skb_data *entry; 703 struct urb *urb; 704 int retval; 705 706 skb_queue_walk(q, skb) { 707 entry = (struct skb_data *) skb->cb; 708 if (entry->state != unlink_start) 709 goto found; 710 } 711 break; 712 found: 713 entry->state = unlink_start; 714 urb = entry->urb; 715 716 /* 717 * Get reference count of the URB to avoid it to be 718 * freed during usb_unlink_urb, which may trigger 719 * use-after-free problem inside usb_unlink_urb since 720 * usb_unlink_urb is always racing with .complete 721 * handler(include defer_bh). 722 */ 723 usb_get_urb(urb); 724 spin_unlock_irqrestore(&q->lock, flags); 725 // during some PM-driven resume scenarios, 726 // these (async) unlinks complete immediately 727 retval = usb_unlink_urb (urb); 728 if (retval != -EINPROGRESS && retval != 0) 729 netdev_dbg(dev->net, "unlink urb err, %d\n", retval); 730 else 731 count++; 732 usb_put_urb(urb); 733 spin_lock_irqsave(&q->lock, flags); 734 } 735 spin_unlock_irqrestore (&q->lock, flags); 736 return count; 737 } 738 739 // Flush all pending rx urbs 740 // minidrivers may need to do this when the MTU changes 741 742 void usbnet_unlink_rx_urbs(struct usbnet *dev) 743 { 744 if (netif_running(dev->net)) { 745 (void) unlink_urbs (dev, &dev->rxq); 746 tasklet_schedule(&dev->bh); 747 } 748 } 749 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); 750 751 /*-------------------------------------------------------------------------*/ 752 753 // precondition: never called in_interrupt 754 static void usbnet_terminate_urbs(struct usbnet *dev) 755 { 756 DECLARE_WAITQUEUE(wait, current); 757 int temp; 758 759 /* ensure there are no more active urbs */ 760 add_wait_queue(&dev->wait, &wait); 761 set_current_state(TASK_UNINTERRUPTIBLE); 762 temp = unlink_urbs(dev, &dev->txq) + 763 unlink_urbs(dev, &dev->rxq); 764 765 /* maybe wait for deletions to finish. */ 766 while (!skb_queue_empty(&dev->rxq) 767 && !skb_queue_empty(&dev->txq) 768 && !skb_queue_empty(&dev->done)) { 769 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS)); 770 set_current_state(TASK_UNINTERRUPTIBLE); 771 netif_dbg(dev, ifdown, dev->net, 772 "waited for %d urb completions\n", temp); 773 } 774 set_current_state(TASK_RUNNING); 775 remove_wait_queue(&dev->wait, &wait); 776 } 777 778 int usbnet_stop (struct net_device *net) 779 { 780 struct usbnet *dev = netdev_priv(net); 781 struct driver_info *info = dev->driver_info; 782 int retval, pm; 783 784 clear_bit(EVENT_DEV_OPEN, &dev->flags); 785 netif_stop_queue (net); 786 787 netif_info(dev, ifdown, dev->net, 788 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n", 789 net->stats.rx_packets, net->stats.tx_packets, 790 net->stats.rx_errors, net->stats.tx_errors); 791 792 /* to not race resume */ 793 pm = usb_autopm_get_interface(dev->intf); 794 /* allow minidriver to stop correctly (wireless devices to turn off 795 * radio etc) */ 796 if (info->stop) { 797 retval = info->stop(dev); 798 if (retval < 0) 799 netif_info(dev, ifdown, dev->net, 800 "stop fail (%d) usbnet usb-%s-%s, %s\n", 801 retval, 802 dev->udev->bus->bus_name, dev->udev->devpath, 803 info->description); 804 } 805 806 if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) 807 usbnet_terminate_urbs(dev); 808 809 usbnet_status_stop(dev); 810 811 usbnet_purge_paused_rxq(dev); 812 813 /* deferred work (task, timer, softirq) must also stop. 814 * can't flush_scheduled_work() until we drop rtnl (later), 815 * else workers could deadlock; so make workers a NOP. 816 */ 817 dev->flags = 0; 818 del_timer_sync (&dev->delay); 819 tasklet_kill (&dev->bh); 820 if (!pm) 821 usb_autopm_put_interface(dev->intf); 822 823 if (info->manage_power && 824 !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags)) 825 info->manage_power(dev, 0); 826 else 827 usb_autopm_put_interface(dev->intf); 828 829 return 0; 830 } 831 EXPORT_SYMBOL_GPL(usbnet_stop); 832 833 /*-------------------------------------------------------------------------*/ 834 835 // posts reads, and enables write queuing 836 837 // precondition: never called in_interrupt 838 839 int usbnet_open (struct net_device *net) 840 { 841 struct usbnet *dev = netdev_priv(net); 842 int retval; 843 struct driver_info *info = dev->driver_info; 844 845 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { 846 netif_info(dev, ifup, dev->net, 847 "resumption fail (%d) usbnet usb-%s-%s, %s\n", 848 retval, 849 dev->udev->bus->bus_name, 850 dev->udev->devpath, 851 info->description); 852 goto done_nopm; 853 } 854 855 // put into "known safe" state 856 if (info->reset && (retval = info->reset (dev)) < 0) { 857 netif_info(dev, ifup, dev->net, 858 "open reset fail (%d) usbnet usb-%s-%s, %s\n", 859 retval, 860 dev->udev->bus->bus_name, 861 dev->udev->devpath, 862 info->description); 863 goto done; 864 } 865 866 /* hard_mtu or rx_urb_size may change in reset() */ 867 usbnet_update_max_qlen(dev); 868 869 // insist peer be connected 870 if (info->check_connect && (retval = info->check_connect (dev)) < 0) { 871 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval); 872 goto done; 873 } 874 875 /* start any status interrupt transfer */ 876 if (dev->interrupt) { 877 retval = usbnet_status_start(dev, GFP_KERNEL); 878 if (retval < 0) { 879 netif_err(dev, ifup, dev->net, 880 "intr submit %d\n", retval); 881 goto done; 882 } 883 } 884 885 set_bit(EVENT_DEV_OPEN, &dev->flags); 886 netif_start_queue (net); 887 netif_info(dev, ifup, dev->net, 888 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n", 889 (int)RX_QLEN(dev), (int)TX_QLEN(dev), 890 dev->net->mtu, 891 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" : 892 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" : 893 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" : 894 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" : 895 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" : 896 "simple"); 897 898 /* reset rx error state */ 899 dev->pkt_cnt = 0; 900 dev->pkt_err = 0; 901 clear_bit(EVENT_RX_KILL, &dev->flags); 902 903 // delay posting reads until we're fully open 904 tasklet_schedule (&dev->bh); 905 if (info->manage_power) { 906 retval = info->manage_power(dev, 1); 907 if (retval < 0) { 908 retval = 0; 909 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags); 910 } else { 911 usb_autopm_put_interface(dev->intf); 912 } 913 } 914 return retval; 915 done: 916 usb_autopm_put_interface(dev->intf); 917 done_nopm: 918 return retval; 919 } 920 EXPORT_SYMBOL_GPL(usbnet_open); 921 922 /*-------------------------------------------------------------------------*/ 923 924 /* ethtool methods; minidrivers may need to add some more, but 925 * they'll probably want to use this base set. 926 */ 927 928 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd) 929 { 930 struct usbnet *dev = netdev_priv(net); 931 932 if (!dev->mii.mdio_read) 933 return -EOPNOTSUPP; 934 935 return mii_ethtool_gset(&dev->mii, cmd); 936 } 937 EXPORT_SYMBOL_GPL(usbnet_get_settings); 938 939 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd) 940 { 941 struct usbnet *dev = netdev_priv(net); 942 int retval; 943 944 if (!dev->mii.mdio_write) 945 return -EOPNOTSUPP; 946 947 retval = mii_ethtool_sset(&dev->mii, cmd); 948 949 /* link speed/duplex might have changed */ 950 if (dev->driver_info->link_reset) 951 dev->driver_info->link_reset(dev); 952 953 /* hard_mtu or rx_urb_size may change in link_reset() */ 954 usbnet_update_max_qlen(dev); 955 956 return retval; 957 958 } 959 EXPORT_SYMBOL_GPL(usbnet_set_settings); 960 961 u32 usbnet_get_link (struct net_device *net) 962 { 963 struct usbnet *dev = netdev_priv(net); 964 965 /* If a check_connect is defined, return its result */ 966 if (dev->driver_info->check_connect) 967 return dev->driver_info->check_connect (dev) == 0; 968 969 /* if the device has mii operations, use those */ 970 if (dev->mii.mdio_read) 971 return mii_link_ok(&dev->mii); 972 973 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ 974 return ethtool_op_get_link(net); 975 } 976 EXPORT_SYMBOL_GPL(usbnet_get_link); 977 978 int usbnet_nway_reset(struct net_device *net) 979 { 980 struct usbnet *dev = netdev_priv(net); 981 982 if (!dev->mii.mdio_write) 983 return -EOPNOTSUPP; 984 985 return mii_nway_restart(&dev->mii); 986 } 987 EXPORT_SYMBOL_GPL(usbnet_nway_reset); 988 989 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) 990 { 991 struct usbnet *dev = netdev_priv(net); 992 993 strlcpy (info->driver, dev->driver_name, sizeof info->driver); 994 strlcpy (info->version, DRIVER_VERSION, sizeof info->version); 995 strlcpy (info->fw_version, dev->driver_info->description, 996 sizeof info->fw_version); 997 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); 998 } 999 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); 1000 1001 u32 usbnet_get_msglevel (struct net_device *net) 1002 { 1003 struct usbnet *dev = netdev_priv(net); 1004 1005 return dev->msg_enable; 1006 } 1007 EXPORT_SYMBOL_GPL(usbnet_get_msglevel); 1008 1009 void usbnet_set_msglevel (struct net_device *net, u32 level) 1010 { 1011 struct usbnet *dev = netdev_priv(net); 1012 1013 dev->msg_enable = level; 1014 } 1015 EXPORT_SYMBOL_GPL(usbnet_set_msglevel); 1016 1017 /* drivers may override default ethtool_ops in their bind() routine */ 1018 static const struct ethtool_ops usbnet_ethtool_ops = { 1019 .get_settings = usbnet_get_settings, 1020 .set_settings = usbnet_set_settings, 1021 .get_link = usbnet_get_link, 1022 .nway_reset = usbnet_nway_reset, 1023 .get_drvinfo = usbnet_get_drvinfo, 1024 .get_msglevel = usbnet_get_msglevel, 1025 .set_msglevel = usbnet_set_msglevel, 1026 .get_ts_info = ethtool_op_get_ts_info, 1027 }; 1028 1029 /*-------------------------------------------------------------------------*/ 1030 1031 static void __handle_link_change(struct usbnet *dev) 1032 { 1033 if (!test_bit(EVENT_DEV_OPEN, &dev->flags)) 1034 return; 1035 1036 if (!netif_carrier_ok(dev->net)) { 1037 /* kill URBs for reading packets to save bus bandwidth */ 1038 unlink_urbs(dev, &dev->rxq); 1039 1040 /* 1041 * tx_timeout will unlink URBs for sending packets and 1042 * tx queue is stopped by netcore after link becomes off 1043 */ 1044 } else { 1045 /* submitting URBs for reading packets */ 1046 tasklet_schedule(&dev->bh); 1047 } 1048 1049 /* hard_mtu or rx_urb_size may change during link change */ 1050 usbnet_update_max_qlen(dev); 1051 1052 clear_bit(EVENT_LINK_CHANGE, &dev->flags); 1053 } 1054 1055 static void usbnet_set_rx_mode(struct net_device *net) 1056 { 1057 struct usbnet *dev = netdev_priv(net); 1058 1059 usbnet_defer_kevent(dev, EVENT_SET_RX_MODE); 1060 } 1061 1062 static void __handle_set_rx_mode(struct usbnet *dev) 1063 { 1064 if (dev->driver_info->set_rx_mode) 1065 (dev->driver_info->set_rx_mode)(dev); 1066 1067 clear_bit(EVENT_SET_RX_MODE, &dev->flags); 1068 } 1069 1070 /* work that cannot be done in interrupt context uses keventd. 1071 * 1072 * NOTE: with 2.5 we could do more of this using completion callbacks, 1073 * especially now that control transfers can be queued. 1074 */ 1075 static void 1076 kevent (struct work_struct *work) 1077 { 1078 struct usbnet *dev = 1079 container_of(work, struct usbnet, kevent); 1080 int status; 1081 1082 /* usb_clear_halt() needs a thread context */ 1083 if (test_bit (EVENT_TX_HALT, &dev->flags)) { 1084 unlink_urbs (dev, &dev->txq); 1085 status = usb_autopm_get_interface(dev->intf); 1086 if (status < 0) 1087 goto fail_pipe; 1088 status = usb_clear_halt (dev->udev, dev->out); 1089 usb_autopm_put_interface(dev->intf); 1090 if (status < 0 && 1091 status != -EPIPE && 1092 status != -ESHUTDOWN) { 1093 if (netif_msg_tx_err (dev)) 1094 fail_pipe: 1095 netdev_err(dev->net, "can't clear tx halt, status %d\n", 1096 status); 1097 } else { 1098 clear_bit (EVENT_TX_HALT, &dev->flags); 1099 if (status != -ESHUTDOWN) 1100 netif_wake_queue (dev->net); 1101 } 1102 } 1103 if (test_bit (EVENT_RX_HALT, &dev->flags)) { 1104 unlink_urbs (dev, &dev->rxq); 1105 status = usb_autopm_get_interface(dev->intf); 1106 if (status < 0) 1107 goto fail_halt; 1108 status = usb_clear_halt (dev->udev, dev->in); 1109 usb_autopm_put_interface(dev->intf); 1110 if (status < 0 && 1111 status != -EPIPE && 1112 status != -ESHUTDOWN) { 1113 if (netif_msg_rx_err (dev)) 1114 fail_halt: 1115 netdev_err(dev->net, "can't clear rx halt, status %d\n", 1116 status); 1117 } else { 1118 clear_bit (EVENT_RX_HALT, &dev->flags); 1119 tasklet_schedule (&dev->bh); 1120 } 1121 } 1122 1123 /* tasklet could resubmit itself forever if memory is tight */ 1124 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { 1125 struct urb *urb = NULL; 1126 int resched = 1; 1127 1128 if (netif_running (dev->net)) 1129 urb = usb_alloc_urb (0, GFP_KERNEL); 1130 else 1131 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1132 if (urb != NULL) { 1133 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1134 status = usb_autopm_get_interface(dev->intf); 1135 if (status < 0) { 1136 usb_free_urb(urb); 1137 goto fail_lowmem; 1138 } 1139 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) 1140 resched = 0; 1141 usb_autopm_put_interface(dev->intf); 1142 fail_lowmem: 1143 if (resched) 1144 tasklet_schedule (&dev->bh); 1145 } 1146 } 1147 1148 if (test_bit (EVENT_LINK_RESET, &dev->flags)) { 1149 struct driver_info *info = dev->driver_info; 1150 int retval = 0; 1151 1152 clear_bit (EVENT_LINK_RESET, &dev->flags); 1153 status = usb_autopm_get_interface(dev->intf); 1154 if (status < 0) 1155 goto skip_reset; 1156 if(info->link_reset && (retval = info->link_reset(dev)) < 0) { 1157 usb_autopm_put_interface(dev->intf); 1158 skip_reset: 1159 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", 1160 retval, 1161 dev->udev->bus->bus_name, 1162 dev->udev->devpath, 1163 info->description); 1164 } else { 1165 usb_autopm_put_interface(dev->intf); 1166 } 1167 1168 /* handle link change from link resetting */ 1169 __handle_link_change(dev); 1170 } 1171 1172 if (test_bit (EVENT_LINK_CHANGE, &dev->flags)) 1173 __handle_link_change(dev); 1174 1175 if (test_bit (EVENT_SET_RX_MODE, &dev->flags)) 1176 __handle_set_rx_mode(dev); 1177 1178 1179 if (dev->flags) 1180 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); 1181 } 1182 1183 /*-------------------------------------------------------------------------*/ 1184 1185 static void tx_complete (struct urb *urb) 1186 { 1187 struct sk_buff *skb = (struct sk_buff *) urb->context; 1188 struct skb_data *entry = (struct skb_data *) skb->cb; 1189 struct usbnet *dev = entry->dev; 1190 1191 if (urb->status == 0) { 1192 if (!(dev->driver_info->flags & FLAG_MULTI_PACKET)) 1193 dev->net->stats.tx_packets++; 1194 dev->net->stats.tx_bytes += entry->length; 1195 } else { 1196 dev->net->stats.tx_errors++; 1197 1198 switch (urb->status) { 1199 case -EPIPE: 1200 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1201 break; 1202 1203 /* software-driven interface shutdown */ 1204 case -ECONNRESET: // async unlink 1205 case -ESHUTDOWN: // hardware gone 1206 break; 1207 1208 /* like rx, tx gets controller i/o faults during hub_wq 1209 * delays and so it uses the same throttling mechanism. 1210 */ 1211 case -EPROTO: 1212 case -ETIME: 1213 case -EILSEQ: 1214 usb_mark_last_busy(dev->udev); 1215 if (!timer_pending (&dev->delay)) { 1216 mod_timer (&dev->delay, 1217 jiffies + THROTTLE_JIFFIES); 1218 netif_dbg(dev, link, dev->net, 1219 "tx throttle %d\n", urb->status); 1220 } 1221 netif_stop_queue (dev->net); 1222 break; 1223 default: 1224 netif_dbg(dev, tx_err, dev->net, 1225 "tx err %d\n", entry->urb->status); 1226 break; 1227 } 1228 } 1229 1230 usb_autopm_put_interface_async(dev->intf); 1231 (void) defer_bh(dev, skb, &dev->txq, tx_done); 1232 } 1233 1234 /*-------------------------------------------------------------------------*/ 1235 1236 void usbnet_tx_timeout (struct net_device *net) 1237 { 1238 struct usbnet *dev = netdev_priv(net); 1239 1240 unlink_urbs (dev, &dev->txq); 1241 tasklet_schedule (&dev->bh); 1242 /* this needs to be handled individually because the generic layer 1243 * doesn't know what is sufficient and could not restore private 1244 * information if a remedy of an unconditional reset were used. 1245 */ 1246 if (dev->driver_info->recover) 1247 (dev->driver_info->recover)(dev); 1248 } 1249 EXPORT_SYMBOL_GPL(usbnet_tx_timeout); 1250 1251 /*-------------------------------------------------------------------------*/ 1252 1253 static int build_dma_sg(const struct sk_buff *skb, struct urb *urb) 1254 { 1255 unsigned num_sgs, total_len = 0; 1256 int i, s = 0; 1257 1258 num_sgs = skb_shinfo(skb)->nr_frags + 1; 1259 if (num_sgs == 1) 1260 return 0; 1261 1262 /* reserve one for zero packet */ 1263 urb->sg = kmalloc((num_sgs + 1) * sizeof(struct scatterlist), 1264 GFP_ATOMIC); 1265 if (!urb->sg) 1266 return -ENOMEM; 1267 1268 urb->num_sgs = num_sgs; 1269 sg_init_table(urb->sg, urb->num_sgs + 1); 1270 1271 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb)); 1272 total_len += skb_headlen(skb); 1273 1274 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1275 struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i]; 1276 1277 total_len += skb_frag_size(f); 1278 sg_set_page(&urb->sg[i + s], f->page.p, f->size, 1279 f->page_offset); 1280 } 1281 urb->transfer_buffer_length = total_len; 1282 1283 return 1; 1284 } 1285 1286 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, 1287 struct net_device *net) 1288 { 1289 struct usbnet *dev = netdev_priv(net); 1290 int length; 1291 struct urb *urb = NULL; 1292 struct skb_data *entry; 1293 struct driver_info *info = dev->driver_info; 1294 unsigned long flags; 1295 int retval; 1296 1297 if (skb) 1298 skb_tx_timestamp(skb); 1299 1300 // some devices want funky USB-level framing, for 1301 // win32 driver (usually) and/or hardware quirks 1302 if (info->tx_fixup) { 1303 skb = info->tx_fixup (dev, skb, GFP_ATOMIC); 1304 if (!skb) { 1305 /* packet collected; minidriver waiting for more */ 1306 if (info->flags & FLAG_MULTI_PACKET) 1307 goto not_drop; 1308 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); 1309 goto drop; 1310 } 1311 } 1312 1313 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { 1314 netif_dbg(dev, tx_err, dev->net, "no urb\n"); 1315 goto drop; 1316 } 1317 1318 entry = (struct skb_data *) skb->cb; 1319 entry->urb = urb; 1320 entry->dev = dev; 1321 1322 usb_fill_bulk_urb (urb, dev->udev, dev->out, 1323 skb->data, skb->len, tx_complete, skb); 1324 if (dev->can_dma_sg) { 1325 if (build_dma_sg(skb, urb) < 0) 1326 goto drop; 1327 } 1328 length = urb->transfer_buffer_length; 1329 1330 /* don't assume the hardware handles USB_ZERO_PACKET 1331 * NOTE: strictly conforming cdc-ether devices should expect 1332 * the ZLP here, but ignore the one-byte packet. 1333 * NOTE2: CDC NCM specification is different from CDC ECM when 1334 * handling ZLP/short packets, so cdc_ncm driver will make short 1335 * packet itself if needed. 1336 */ 1337 if (length % dev->maxpacket == 0) { 1338 if (!(info->flags & FLAG_SEND_ZLP)) { 1339 if (!(info->flags & FLAG_MULTI_PACKET)) { 1340 length++; 1341 if (skb_tailroom(skb) && !urb->num_sgs) { 1342 skb->data[skb->len] = 0; 1343 __skb_put(skb, 1); 1344 } else if (urb->num_sgs) 1345 sg_set_buf(&urb->sg[urb->num_sgs++], 1346 dev->padding_pkt, 1); 1347 } 1348 } else 1349 urb->transfer_flags |= URB_ZERO_PACKET; 1350 } 1351 entry->length = urb->transfer_buffer_length = length; 1352 1353 spin_lock_irqsave(&dev->txq.lock, flags); 1354 retval = usb_autopm_get_interface_async(dev->intf); 1355 if (retval < 0) { 1356 spin_unlock_irqrestore(&dev->txq.lock, flags); 1357 goto drop; 1358 } 1359 1360 #ifdef CONFIG_PM 1361 /* if this triggers the device is still a sleep */ 1362 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { 1363 /* transmission will be done in resume */ 1364 usb_anchor_urb(urb, &dev->deferred); 1365 /* no use to process more packets */ 1366 netif_stop_queue(net); 1367 usb_put_urb(urb); 1368 spin_unlock_irqrestore(&dev->txq.lock, flags); 1369 netdev_dbg(dev->net, "Delaying transmission for resumption\n"); 1370 goto deferred; 1371 } 1372 #endif 1373 1374 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { 1375 case -EPIPE: 1376 netif_stop_queue (net); 1377 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1378 usb_autopm_put_interface_async(dev->intf); 1379 break; 1380 default: 1381 usb_autopm_put_interface_async(dev->intf); 1382 netif_dbg(dev, tx_err, dev->net, 1383 "tx: submit urb err %d\n", retval); 1384 break; 1385 case 0: 1386 net->trans_start = jiffies; 1387 __usbnet_queue_skb(&dev->txq, skb, tx_start); 1388 if (dev->txq.qlen >= TX_QLEN (dev)) 1389 netif_stop_queue (net); 1390 } 1391 spin_unlock_irqrestore (&dev->txq.lock, flags); 1392 1393 if (retval) { 1394 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); 1395 drop: 1396 dev->net->stats.tx_dropped++; 1397 not_drop: 1398 if (skb) 1399 dev_kfree_skb_any (skb); 1400 if (urb) { 1401 kfree(urb->sg); 1402 usb_free_urb(urb); 1403 } 1404 } else 1405 netif_dbg(dev, tx_queued, dev->net, 1406 "> tx, len %d, type 0x%x\n", length, skb->protocol); 1407 #ifdef CONFIG_PM 1408 deferred: 1409 #endif 1410 return NETDEV_TX_OK; 1411 } 1412 EXPORT_SYMBOL_GPL(usbnet_start_xmit); 1413 1414 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags) 1415 { 1416 struct urb *urb; 1417 int i; 1418 int ret = 0; 1419 1420 /* don't refill the queue all at once */ 1421 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) { 1422 urb = usb_alloc_urb(0, flags); 1423 if (urb != NULL) { 1424 ret = rx_submit(dev, urb, flags); 1425 if (ret) 1426 goto err; 1427 } else { 1428 ret = -ENOMEM; 1429 goto err; 1430 } 1431 } 1432 err: 1433 return ret; 1434 } 1435 1436 /*-------------------------------------------------------------------------*/ 1437 1438 // tasklet (work deferred from completions, in_irq) or timer 1439 1440 static void usbnet_bh (unsigned long param) 1441 { 1442 struct usbnet *dev = (struct usbnet *) param; 1443 struct sk_buff *skb; 1444 struct skb_data *entry; 1445 1446 while ((skb = skb_dequeue (&dev->done))) { 1447 entry = (struct skb_data *) skb->cb; 1448 switch (entry->state) { 1449 case rx_done: 1450 entry->state = rx_cleanup; 1451 rx_process (dev, skb); 1452 continue; 1453 case tx_done: 1454 kfree(entry->urb->sg); 1455 case rx_cleanup: 1456 usb_free_urb (entry->urb); 1457 dev_kfree_skb (skb); 1458 continue; 1459 default: 1460 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); 1461 } 1462 } 1463 1464 /* restart RX again after disabling due to high error rate */ 1465 clear_bit(EVENT_RX_KILL, &dev->flags); 1466 1467 /* waiting for all pending urbs to complete? 1468 * only then can we forgo submitting anew 1469 */ 1470 if (waitqueue_active(&dev->wait)) { 1471 if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0) 1472 wake_up_all(&dev->wait); 1473 1474 // or are we maybe short a few urbs? 1475 } else if (netif_running (dev->net) && 1476 netif_device_present (dev->net) && 1477 netif_carrier_ok(dev->net) && 1478 !timer_pending (&dev->delay) && 1479 !test_bit (EVENT_RX_HALT, &dev->flags)) { 1480 int temp = dev->rxq.qlen; 1481 1482 if (temp < RX_QLEN(dev)) { 1483 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK) 1484 return; 1485 if (temp != dev->rxq.qlen) 1486 netif_dbg(dev, link, dev->net, 1487 "rxqlen %d --> %d\n", 1488 temp, dev->rxq.qlen); 1489 if (dev->rxq.qlen < RX_QLEN(dev)) 1490 tasklet_schedule (&dev->bh); 1491 } 1492 if (dev->txq.qlen < TX_QLEN (dev)) 1493 netif_wake_queue (dev->net); 1494 } 1495 } 1496 1497 1498 /*------------------------------------------------------------------------- 1499 * 1500 * USB Device Driver support 1501 * 1502 *-------------------------------------------------------------------------*/ 1503 1504 // precondition: never called in_interrupt 1505 1506 void usbnet_disconnect (struct usb_interface *intf) 1507 { 1508 struct usbnet *dev; 1509 struct usb_device *xdev; 1510 struct net_device *net; 1511 1512 dev = usb_get_intfdata(intf); 1513 usb_set_intfdata(intf, NULL); 1514 if (!dev) 1515 return; 1516 1517 xdev = interface_to_usbdev (intf); 1518 1519 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", 1520 intf->dev.driver->name, 1521 xdev->bus->bus_name, xdev->devpath, 1522 dev->driver_info->description); 1523 1524 net = dev->net; 1525 unregister_netdev (net); 1526 1527 cancel_work_sync(&dev->kevent); 1528 1529 usb_scuttle_anchored_urbs(&dev->deferred); 1530 1531 if (dev->driver_info->unbind) 1532 dev->driver_info->unbind (dev, intf); 1533 1534 usb_kill_urb(dev->interrupt); 1535 usb_free_urb(dev->interrupt); 1536 kfree(dev->padding_pkt); 1537 1538 free_netdev(net); 1539 } 1540 EXPORT_SYMBOL_GPL(usbnet_disconnect); 1541 1542 static const struct net_device_ops usbnet_netdev_ops = { 1543 .ndo_open = usbnet_open, 1544 .ndo_stop = usbnet_stop, 1545 .ndo_start_xmit = usbnet_start_xmit, 1546 .ndo_tx_timeout = usbnet_tx_timeout, 1547 .ndo_set_rx_mode = usbnet_set_rx_mode, 1548 .ndo_change_mtu = usbnet_change_mtu, 1549 .ndo_set_mac_address = eth_mac_addr, 1550 .ndo_validate_addr = eth_validate_addr, 1551 }; 1552 1553 /*-------------------------------------------------------------------------*/ 1554 1555 // precondition: never called in_interrupt 1556 1557 static struct device_type wlan_type = { 1558 .name = "wlan", 1559 }; 1560 1561 static struct device_type wwan_type = { 1562 .name = "wwan", 1563 }; 1564 1565 int 1566 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) 1567 { 1568 struct usbnet *dev; 1569 struct net_device *net; 1570 struct usb_host_interface *interface; 1571 struct driver_info *info; 1572 struct usb_device *xdev; 1573 int status; 1574 const char *name; 1575 struct usb_driver *driver = to_usb_driver(udev->dev.driver); 1576 1577 /* usbnet already took usb runtime pm, so have to enable the feature 1578 * for usb interface, otherwise usb_autopm_get_interface may return 1579 * failure if RUNTIME_PM is enabled. 1580 */ 1581 if (!driver->supports_autosuspend) { 1582 driver->supports_autosuspend = 1; 1583 pm_runtime_enable(&udev->dev); 1584 } 1585 1586 name = udev->dev.driver->name; 1587 info = (struct driver_info *) prod->driver_info; 1588 if (!info) { 1589 dev_dbg (&udev->dev, "blacklisted by %s\n", name); 1590 return -ENODEV; 1591 } 1592 xdev = interface_to_usbdev (udev); 1593 interface = udev->cur_altsetting; 1594 1595 status = -ENOMEM; 1596 1597 // set up our own records 1598 net = alloc_etherdev(sizeof(*dev)); 1599 if (!net) 1600 goto out; 1601 1602 /* netdev_printk() needs this so do it as early as possible */ 1603 SET_NETDEV_DEV(net, &udev->dev); 1604 1605 dev = netdev_priv(net); 1606 dev->udev = xdev; 1607 dev->intf = udev; 1608 dev->driver_info = info; 1609 dev->driver_name = name; 1610 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV 1611 | NETIF_MSG_PROBE | NETIF_MSG_LINK); 1612 init_waitqueue_head(&dev->wait); 1613 skb_queue_head_init (&dev->rxq); 1614 skb_queue_head_init (&dev->txq); 1615 skb_queue_head_init (&dev->done); 1616 skb_queue_head_init(&dev->rxq_pause); 1617 dev->bh.func = usbnet_bh; 1618 dev->bh.data = (unsigned long) dev; 1619 INIT_WORK (&dev->kevent, kevent); 1620 init_usb_anchor(&dev->deferred); 1621 dev->delay.function = usbnet_bh; 1622 dev->delay.data = (unsigned long) dev; 1623 init_timer (&dev->delay); 1624 mutex_init (&dev->phy_mutex); 1625 mutex_init(&dev->interrupt_mutex); 1626 dev->interrupt_count = 0; 1627 1628 dev->net = net; 1629 strcpy (net->name, "usb%d"); 1630 memcpy (net->dev_addr, node_id, sizeof node_id); 1631 1632 /* rx and tx sides can use different message sizes; 1633 * bind() should set rx_urb_size in that case. 1634 */ 1635 dev->hard_mtu = net->mtu + net->hard_header_len; 1636 #if 0 1637 // dma_supported() is deeply broken on almost all architectures 1638 // possible with some EHCI controllers 1639 if (dma_supported (&udev->dev, DMA_BIT_MASK(64))) 1640 net->features |= NETIF_F_HIGHDMA; 1641 #endif 1642 1643 net->netdev_ops = &usbnet_netdev_ops; 1644 net->watchdog_timeo = TX_TIMEOUT_JIFFIES; 1645 net->ethtool_ops = &usbnet_ethtool_ops; 1646 1647 // allow device-specific bind/init procedures 1648 // NOTE net->name still not usable ... 1649 if (info->bind) { 1650 status = info->bind (dev, udev); 1651 if (status < 0) 1652 goto out1; 1653 1654 // heuristic: "usb%d" for links we know are two-host, 1655 // else "eth%d" when there's reasonable doubt. userspace 1656 // can rename the link if it knows better. 1657 if ((dev->driver_info->flags & FLAG_ETHER) != 0 && 1658 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 || 1659 (net->dev_addr [0] & 0x02) == 0)) 1660 strcpy (net->name, "eth%d"); 1661 /* WLAN devices should always be named "wlan%d" */ 1662 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1663 strcpy(net->name, "wlan%d"); 1664 /* WWAN devices should always be named "wwan%d" */ 1665 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1666 strcpy(net->name, "wwan%d"); 1667 1668 /* devices that cannot do ARP */ 1669 if ((dev->driver_info->flags & FLAG_NOARP) != 0) 1670 net->flags |= IFF_NOARP; 1671 1672 /* maybe the remote can't receive an Ethernet MTU */ 1673 if (net->mtu > (dev->hard_mtu - net->hard_header_len)) 1674 net->mtu = dev->hard_mtu - net->hard_header_len; 1675 } else if (!info->in || !info->out) 1676 status = usbnet_get_endpoints (dev, udev); 1677 else { 1678 dev->in = usb_rcvbulkpipe (xdev, info->in); 1679 dev->out = usb_sndbulkpipe (xdev, info->out); 1680 if (!(info->flags & FLAG_NO_SETINT)) 1681 status = usb_set_interface (xdev, 1682 interface->desc.bInterfaceNumber, 1683 interface->desc.bAlternateSetting); 1684 else 1685 status = 0; 1686 1687 } 1688 if (status >= 0 && dev->status) 1689 status = init_status (dev, udev); 1690 if (status < 0) 1691 goto out3; 1692 1693 if (!dev->rx_urb_size) 1694 dev->rx_urb_size = dev->hard_mtu; 1695 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); 1696 1697 /* let userspace know we have a random address */ 1698 if (ether_addr_equal(net->dev_addr, node_id)) 1699 net->addr_assign_type = NET_ADDR_RANDOM; 1700 1701 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1702 SET_NETDEV_DEVTYPE(net, &wlan_type); 1703 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1704 SET_NETDEV_DEVTYPE(net, &wwan_type); 1705 1706 /* initialize max rx_qlen and tx_qlen */ 1707 usbnet_update_max_qlen(dev); 1708 1709 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) && 1710 !(info->flags & FLAG_MULTI_PACKET)) { 1711 dev->padding_pkt = kzalloc(1, GFP_KERNEL); 1712 if (!dev->padding_pkt) { 1713 status = -ENOMEM; 1714 goto out4; 1715 } 1716 } 1717 1718 status = register_netdev (net); 1719 if (status) 1720 goto out5; 1721 netif_info(dev, probe, dev->net, 1722 "register '%s' at usb-%s-%s, %s, %pM\n", 1723 udev->dev.driver->name, 1724 xdev->bus->bus_name, xdev->devpath, 1725 dev->driver_info->description, 1726 net->dev_addr); 1727 1728 // ok, it's ready to go. 1729 usb_set_intfdata (udev, dev); 1730 1731 netif_device_attach (net); 1732 1733 if (dev->driver_info->flags & FLAG_LINK_INTR) 1734 usbnet_link_change(dev, 0, 0); 1735 1736 return 0; 1737 1738 out5: 1739 kfree(dev->padding_pkt); 1740 out4: 1741 usb_free_urb(dev->interrupt); 1742 out3: 1743 if (info->unbind) 1744 info->unbind (dev, udev); 1745 out1: 1746 free_netdev(net); 1747 out: 1748 return status; 1749 } 1750 EXPORT_SYMBOL_GPL(usbnet_probe); 1751 1752 /*-------------------------------------------------------------------------*/ 1753 1754 /* 1755 * suspend the whole driver as soon as the first interface is suspended 1756 * resume only when the last interface is resumed 1757 */ 1758 1759 int usbnet_suspend (struct usb_interface *intf, pm_message_t message) 1760 { 1761 struct usbnet *dev = usb_get_intfdata(intf); 1762 1763 if (!dev->suspend_count++) { 1764 spin_lock_irq(&dev->txq.lock); 1765 /* don't autosuspend while transmitting */ 1766 if (dev->txq.qlen && PMSG_IS_AUTO(message)) { 1767 dev->suspend_count--; 1768 spin_unlock_irq(&dev->txq.lock); 1769 return -EBUSY; 1770 } else { 1771 set_bit(EVENT_DEV_ASLEEP, &dev->flags); 1772 spin_unlock_irq(&dev->txq.lock); 1773 } 1774 /* 1775 * accelerate emptying of the rx and queues, to avoid 1776 * having everything error out. 1777 */ 1778 netif_device_detach (dev->net); 1779 usbnet_terminate_urbs(dev); 1780 __usbnet_status_stop_force(dev); 1781 1782 /* 1783 * reattach so runtime management can use and 1784 * wake the device 1785 */ 1786 netif_device_attach (dev->net); 1787 } 1788 return 0; 1789 } 1790 EXPORT_SYMBOL_GPL(usbnet_suspend); 1791 1792 int usbnet_resume (struct usb_interface *intf) 1793 { 1794 struct usbnet *dev = usb_get_intfdata(intf); 1795 struct sk_buff *skb; 1796 struct urb *res; 1797 int retval; 1798 1799 if (!--dev->suspend_count) { 1800 /* resume interrupt URB if it was previously submitted */ 1801 __usbnet_status_start_force(dev, GFP_NOIO); 1802 1803 spin_lock_irq(&dev->txq.lock); 1804 while ((res = usb_get_from_anchor(&dev->deferred))) { 1805 1806 skb = (struct sk_buff *)res->context; 1807 retval = usb_submit_urb(res, GFP_ATOMIC); 1808 if (retval < 0) { 1809 dev_kfree_skb_any(skb); 1810 kfree(res->sg); 1811 usb_free_urb(res); 1812 usb_autopm_put_interface_async(dev->intf); 1813 } else { 1814 dev->net->trans_start = jiffies; 1815 __skb_queue_tail(&dev->txq, skb); 1816 } 1817 } 1818 1819 smp_mb(); 1820 clear_bit(EVENT_DEV_ASLEEP, &dev->flags); 1821 spin_unlock_irq(&dev->txq.lock); 1822 1823 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) { 1824 /* handle remote wakeup ASAP 1825 * we cannot race against stop 1826 */ 1827 if (netif_device_present(dev->net) && 1828 !timer_pending(&dev->delay) && 1829 !test_bit(EVENT_RX_HALT, &dev->flags)) 1830 rx_alloc_submit(dev, GFP_NOIO); 1831 1832 if (!(dev->txq.qlen >= TX_QLEN(dev))) 1833 netif_tx_wake_all_queues(dev->net); 1834 tasklet_schedule (&dev->bh); 1835 } 1836 } 1837 1838 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) 1839 usb_autopm_get_interface_no_resume(intf); 1840 1841 return 0; 1842 } 1843 EXPORT_SYMBOL_GPL(usbnet_resume); 1844 1845 /* 1846 * Either a subdriver implements manage_power, then it is assumed to always 1847 * be ready to be suspended or it reports the readiness to be suspended 1848 * explicitly 1849 */ 1850 void usbnet_device_suggests_idle(struct usbnet *dev) 1851 { 1852 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) { 1853 dev->intf->needs_remote_wakeup = 1; 1854 usb_autopm_put_interface_async(dev->intf); 1855 } 1856 } 1857 EXPORT_SYMBOL(usbnet_device_suggests_idle); 1858 1859 /* 1860 * For devices that can do without special commands 1861 */ 1862 int usbnet_manage_power(struct usbnet *dev, int on) 1863 { 1864 dev->intf->needs_remote_wakeup = on; 1865 return 0; 1866 } 1867 EXPORT_SYMBOL(usbnet_manage_power); 1868 1869 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset) 1870 { 1871 /* update link after link is reseted */ 1872 if (link && !need_reset) 1873 netif_carrier_on(dev->net); 1874 else 1875 netif_carrier_off(dev->net); 1876 1877 if (need_reset && link) 1878 usbnet_defer_kevent(dev, EVENT_LINK_RESET); 1879 else 1880 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE); 1881 } 1882 EXPORT_SYMBOL(usbnet_link_change); 1883 1884 /*-------------------------------------------------------------------------*/ 1885 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1886 u16 value, u16 index, void *data, u16 size) 1887 { 1888 void *buf = NULL; 1889 int err = -ENOMEM; 1890 1891 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x" 1892 " value=0x%04x index=0x%04x size=%d\n", 1893 cmd, reqtype, value, index, size); 1894 1895 if (data) { 1896 buf = kmalloc(size, GFP_KERNEL); 1897 if (!buf) 1898 goto out; 1899 } 1900 1901 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), 1902 cmd, reqtype, value, index, buf, size, 1903 USB_CTRL_GET_TIMEOUT); 1904 if (err > 0 && err <= size) 1905 memcpy(data, buf, err); 1906 kfree(buf); 1907 out: 1908 return err; 1909 } 1910 1911 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1912 u16 value, u16 index, const void *data, 1913 u16 size) 1914 { 1915 void *buf = NULL; 1916 int err = -ENOMEM; 1917 1918 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 1919 " value=0x%04x index=0x%04x size=%d\n", 1920 cmd, reqtype, value, index, size); 1921 1922 if (data) { 1923 buf = kmemdup(data, size, GFP_KERNEL); 1924 if (!buf) 1925 goto out; 1926 } 1927 1928 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), 1929 cmd, reqtype, value, index, buf, size, 1930 USB_CTRL_SET_TIMEOUT); 1931 kfree(buf); 1932 1933 out: 1934 return err; 1935 } 1936 1937 /* 1938 * The function can't be called inside suspend/resume callback, 1939 * otherwise deadlock will be caused. 1940 */ 1941 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1942 u16 value, u16 index, void *data, u16 size) 1943 { 1944 int ret; 1945 1946 if (usb_autopm_get_interface(dev->intf) < 0) 1947 return -ENODEV; 1948 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index, 1949 data, size); 1950 usb_autopm_put_interface(dev->intf); 1951 return ret; 1952 } 1953 EXPORT_SYMBOL_GPL(usbnet_read_cmd); 1954 1955 /* 1956 * The function can't be called inside suspend/resume callback, 1957 * otherwise deadlock will be caused. 1958 */ 1959 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1960 u16 value, u16 index, const void *data, u16 size) 1961 { 1962 int ret; 1963 1964 if (usb_autopm_get_interface(dev->intf) < 0) 1965 return -ENODEV; 1966 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index, 1967 data, size); 1968 usb_autopm_put_interface(dev->intf); 1969 return ret; 1970 } 1971 EXPORT_SYMBOL_GPL(usbnet_write_cmd); 1972 1973 /* 1974 * The function can be called inside suspend/resume callback safely 1975 * and should only be called by suspend/resume callback generally. 1976 */ 1977 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 1978 u16 value, u16 index, void *data, u16 size) 1979 { 1980 return __usbnet_read_cmd(dev, cmd, reqtype, value, index, 1981 data, size); 1982 } 1983 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm); 1984 1985 /* 1986 * The function can be called inside suspend/resume callback safely 1987 * and should only be called by suspend/resume callback generally. 1988 */ 1989 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 1990 u16 value, u16 index, const void *data, 1991 u16 size) 1992 { 1993 return __usbnet_write_cmd(dev, cmd, reqtype, value, index, 1994 data, size); 1995 } 1996 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm); 1997 1998 static void usbnet_async_cmd_cb(struct urb *urb) 1999 { 2000 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context; 2001 int status = urb->status; 2002 2003 if (status < 0) 2004 dev_dbg(&urb->dev->dev, "%s failed with %d", 2005 __func__, status); 2006 2007 kfree(req); 2008 usb_free_urb(urb); 2009 } 2010 2011 /* 2012 * The caller must make sure that device can't be put into suspend 2013 * state until the control URB completes. 2014 */ 2015 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype, 2016 u16 value, u16 index, const void *data, u16 size) 2017 { 2018 struct usb_ctrlrequest *req = NULL; 2019 struct urb *urb; 2020 int err = -ENOMEM; 2021 void *buf = NULL; 2022 2023 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 2024 " value=0x%04x index=0x%04x size=%d\n", 2025 cmd, reqtype, value, index, size); 2026 2027 urb = usb_alloc_urb(0, GFP_ATOMIC); 2028 if (!urb) { 2029 netdev_err(dev->net, "Error allocating URB in" 2030 " %s!\n", __func__); 2031 goto fail; 2032 } 2033 2034 if (data) { 2035 buf = kmemdup(data, size, GFP_ATOMIC); 2036 if (!buf) { 2037 netdev_err(dev->net, "Error allocating buffer" 2038 " in %s!\n", __func__); 2039 goto fail_free; 2040 } 2041 } 2042 2043 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC); 2044 if (!req) 2045 goto fail_free_buf; 2046 2047 req->bRequestType = reqtype; 2048 req->bRequest = cmd; 2049 req->wValue = cpu_to_le16(value); 2050 req->wIndex = cpu_to_le16(index); 2051 req->wLength = cpu_to_le16(size); 2052 2053 usb_fill_control_urb(urb, dev->udev, 2054 usb_sndctrlpipe(dev->udev, 0), 2055 (void *)req, buf, size, 2056 usbnet_async_cmd_cb, req); 2057 urb->transfer_flags |= URB_FREE_BUFFER; 2058 2059 err = usb_submit_urb(urb, GFP_ATOMIC); 2060 if (err < 0) { 2061 netdev_err(dev->net, "Error submitting the control" 2062 " message: status=%d\n", err); 2063 goto fail_free; 2064 } 2065 return 0; 2066 2067 fail_free_buf: 2068 kfree(buf); 2069 fail_free: 2070 kfree(req); 2071 usb_free_urb(urb); 2072 fail: 2073 return err; 2074 2075 } 2076 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async); 2077 /*-------------------------------------------------------------------------*/ 2078 2079 static int __init usbnet_init(void) 2080 { 2081 /* Compiler should optimize this out. */ 2082 BUILD_BUG_ON( 2083 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data)); 2084 2085 eth_random_addr(node_id); 2086 return 0; 2087 } 2088 module_init(usbnet_init); 2089 2090 static void __exit usbnet_exit(void) 2091 { 2092 } 2093 module_exit(usbnet_exit); 2094 2095 MODULE_AUTHOR("David Brownell"); 2096 MODULE_DESCRIPTION("USB network driver framework"); 2097 MODULE_LICENSE("GPL"); 2098