1 /* 2 * USB Network driver infrastructure 3 * Copyright (C) 2000-2005 by David Brownell 4 * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 /* 21 * This is a generic "USB networking" framework that works with several 22 * kinds of full and high speed networking devices: host-to-host cables, 23 * smart usb peripherals, and actual Ethernet adapters. 24 * 25 * These devices usually differ in terms of control protocols (if they 26 * even have one!) and sometimes they define new framing to wrap or batch 27 * Ethernet packets. Otherwise, they talk to USB pretty much the same, 28 * so interface (un)binding, endpoint I/O queues, fault handling, and other 29 * issues can usefully be addressed by this framework. 30 */ 31 32 // #define DEBUG // error path messages, extra info 33 // #define VERBOSE // more; success messages 34 35 #include <linux/module.h> 36 #include <linux/init.h> 37 #include <linux/netdevice.h> 38 #include <linux/etherdevice.h> 39 #include <linux/ctype.h> 40 #include <linux/ethtool.h> 41 #include <linux/workqueue.h> 42 #include <linux/mii.h> 43 #include <linux/usb.h> 44 #include <linux/usb/usbnet.h> 45 #include <linux/slab.h> 46 #include <linux/kernel.h> 47 #include <linux/pm_runtime.h> 48 49 #define DRIVER_VERSION "22-Aug-2005" 50 51 52 /*-------------------------------------------------------------------------*/ 53 54 /* 55 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max. 56 * Several dozen bytes of IPv4 data can fit in two such transactions. 57 * One maximum size Ethernet packet takes twenty four of them. 58 * For high speed, each frame comfortably fits almost 36 max size 59 * Ethernet packets (so queues should be bigger). 60 * 61 * The goal is to let the USB host controller be busy for 5msec or 62 * more before an irq is required, under load. Jumbograms change 63 * the equation. 64 */ 65 #define MAX_QUEUE_MEMORY (60 * 1518) 66 #define RX_QLEN(dev) ((dev)->rx_qlen) 67 #define TX_QLEN(dev) ((dev)->tx_qlen) 68 69 // reawaken network queue this soon after stopping; else watchdog barks 70 #define TX_TIMEOUT_JIFFIES (5*HZ) 71 72 /* throttle rx/tx briefly after some faults, so hub_wq might disconnect() 73 * us (it polls at HZ/4 usually) before we report too many false errors. 74 */ 75 #define THROTTLE_JIFFIES (HZ/8) 76 77 // between wakeups 78 #define UNLINK_TIMEOUT_MS 3 79 80 /*-------------------------------------------------------------------------*/ 81 82 // randomly generated ethernet address 83 static u8 node_id [ETH_ALEN]; 84 85 static const char driver_name [] = "usbnet"; 86 87 /* use ethtool to change the level for any given device */ 88 static int msg_level = -1; 89 module_param (msg_level, int, 0); 90 MODULE_PARM_DESC (msg_level, "Override default message level"); 91 92 /*-------------------------------------------------------------------------*/ 93 94 /* handles CDC Ethernet and many other network "bulk data" interfaces */ 95 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf) 96 { 97 int tmp; 98 struct usb_host_interface *alt = NULL; 99 struct usb_host_endpoint *in = NULL, *out = NULL; 100 struct usb_host_endpoint *status = NULL; 101 102 for (tmp = 0; tmp < intf->num_altsetting; tmp++) { 103 unsigned ep; 104 105 in = out = status = NULL; 106 alt = intf->altsetting + tmp; 107 108 /* take the first altsetting with in-bulk + out-bulk; 109 * remember any status endpoint, just in case; 110 * ignore other endpoints and altsettings. 111 */ 112 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) { 113 struct usb_host_endpoint *e; 114 int intr = 0; 115 116 e = alt->endpoint + ep; 117 switch (e->desc.bmAttributes) { 118 case USB_ENDPOINT_XFER_INT: 119 if (!usb_endpoint_dir_in(&e->desc)) 120 continue; 121 intr = 1; 122 /* FALLTHROUGH */ 123 case USB_ENDPOINT_XFER_BULK: 124 break; 125 default: 126 continue; 127 } 128 if (usb_endpoint_dir_in(&e->desc)) { 129 if (!intr && !in) 130 in = e; 131 else if (intr && !status) 132 status = e; 133 } else { 134 if (!out) 135 out = e; 136 } 137 } 138 if (in && out) 139 break; 140 } 141 if (!alt || !in || !out) 142 return -EINVAL; 143 144 if (alt->desc.bAlternateSetting != 0 || 145 !(dev->driver_info->flags & FLAG_NO_SETINT)) { 146 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber, 147 alt->desc.bAlternateSetting); 148 if (tmp < 0) 149 return tmp; 150 } 151 152 dev->in = usb_rcvbulkpipe (dev->udev, 153 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 154 dev->out = usb_sndbulkpipe (dev->udev, 155 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 156 dev->status = status; 157 return 0; 158 } 159 EXPORT_SYMBOL_GPL(usbnet_get_endpoints); 160 161 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress) 162 { 163 int tmp = -1, ret; 164 unsigned char buf [13]; 165 166 ret = usb_string(dev->udev, iMACAddress, buf, sizeof buf); 167 if (ret == 12) 168 tmp = hex2bin(dev->net->dev_addr, buf, 6); 169 if (tmp < 0) { 170 dev_dbg(&dev->udev->dev, 171 "bad MAC string %d fetch, %d\n", iMACAddress, tmp); 172 if (ret >= 0) 173 ret = -EINVAL; 174 return ret; 175 } 176 return 0; 177 } 178 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr); 179 180 static void intr_complete (struct urb *urb) 181 { 182 struct usbnet *dev = urb->context; 183 int status = urb->status; 184 185 switch (status) { 186 /* success */ 187 case 0: 188 dev->driver_info->status(dev, urb); 189 break; 190 191 /* software-driven interface shutdown */ 192 case -ENOENT: /* urb killed */ 193 case -ESHUTDOWN: /* hardware gone */ 194 netif_dbg(dev, ifdown, dev->net, 195 "intr shutdown, code %d\n", status); 196 return; 197 198 /* NOTE: not throttling like RX/TX, since this endpoint 199 * already polls infrequently 200 */ 201 default: 202 netdev_dbg(dev->net, "intr status %d\n", status); 203 break; 204 } 205 206 status = usb_submit_urb (urb, GFP_ATOMIC); 207 if (status != 0) 208 netif_err(dev, timer, dev->net, 209 "intr resubmit --> %d\n", status); 210 } 211 212 static int init_status (struct usbnet *dev, struct usb_interface *intf) 213 { 214 char *buf = NULL; 215 unsigned pipe = 0; 216 unsigned maxp; 217 unsigned period; 218 219 if (!dev->driver_info->status) 220 return 0; 221 222 pipe = usb_rcvintpipe (dev->udev, 223 dev->status->desc.bEndpointAddress 224 & USB_ENDPOINT_NUMBER_MASK); 225 maxp = usb_maxpacket (dev->udev, pipe, 0); 226 227 /* avoid 1 msec chatter: min 8 msec poll rate */ 228 period = max ((int) dev->status->desc.bInterval, 229 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3); 230 231 buf = kmalloc (maxp, GFP_KERNEL); 232 if (buf) { 233 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL); 234 if (!dev->interrupt) { 235 kfree (buf); 236 return -ENOMEM; 237 } else { 238 usb_fill_int_urb(dev->interrupt, dev->udev, pipe, 239 buf, maxp, intr_complete, dev, period); 240 dev->interrupt->transfer_flags |= URB_FREE_BUFFER; 241 dev_dbg(&intf->dev, 242 "status ep%din, %d bytes period %d\n", 243 usb_pipeendpoint(pipe), maxp, period); 244 } 245 } 246 return 0; 247 } 248 249 /* Submit the interrupt URB if not previously submitted, increasing refcount */ 250 int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags) 251 { 252 int ret = 0; 253 254 WARN_ON_ONCE(dev->interrupt == NULL); 255 if (dev->interrupt) { 256 mutex_lock(&dev->interrupt_mutex); 257 258 if (++dev->interrupt_count == 1) 259 ret = usb_submit_urb(dev->interrupt, mem_flags); 260 261 dev_dbg(&dev->udev->dev, "incremented interrupt URB count to %d\n", 262 dev->interrupt_count); 263 mutex_unlock(&dev->interrupt_mutex); 264 } 265 return ret; 266 } 267 EXPORT_SYMBOL_GPL(usbnet_status_start); 268 269 /* For resume; submit interrupt URB if previously submitted */ 270 static int __usbnet_status_start_force(struct usbnet *dev, gfp_t mem_flags) 271 { 272 int ret = 0; 273 274 mutex_lock(&dev->interrupt_mutex); 275 if (dev->interrupt_count) { 276 ret = usb_submit_urb(dev->interrupt, mem_flags); 277 dev_dbg(&dev->udev->dev, 278 "submitted interrupt URB for resume\n"); 279 } 280 mutex_unlock(&dev->interrupt_mutex); 281 return ret; 282 } 283 284 /* Kill the interrupt URB if all submitters want it killed */ 285 void usbnet_status_stop(struct usbnet *dev) 286 { 287 if (dev->interrupt) { 288 mutex_lock(&dev->interrupt_mutex); 289 WARN_ON(dev->interrupt_count == 0); 290 291 if (dev->interrupt_count && --dev->interrupt_count == 0) 292 usb_kill_urb(dev->interrupt); 293 294 dev_dbg(&dev->udev->dev, 295 "decremented interrupt URB count to %d\n", 296 dev->interrupt_count); 297 mutex_unlock(&dev->interrupt_mutex); 298 } 299 } 300 EXPORT_SYMBOL_GPL(usbnet_status_stop); 301 302 /* For suspend; always kill interrupt URB */ 303 static void __usbnet_status_stop_force(struct usbnet *dev) 304 { 305 if (dev->interrupt) { 306 mutex_lock(&dev->interrupt_mutex); 307 usb_kill_urb(dev->interrupt); 308 dev_dbg(&dev->udev->dev, "killed interrupt URB for suspend\n"); 309 mutex_unlock(&dev->interrupt_mutex); 310 } 311 } 312 313 /* Passes this packet up the stack, updating its accounting. 314 * Some link protocols batch packets, so their rx_fixup paths 315 * can return clones as well as just modify the original skb. 316 */ 317 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb) 318 { 319 int status; 320 321 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) { 322 skb_queue_tail(&dev->rxq_pause, skb); 323 return; 324 } 325 326 skb->protocol = eth_type_trans (skb, dev->net); 327 dev->net->stats.rx_packets++; 328 dev->net->stats.rx_bytes += skb->len; 329 330 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n", 331 skb->len + sizeof (struct ethhdr), skb->protocol); 332 memset (skb->cb, 0, sizeof (struct skb_data)); 333 334 if (skb_defer_rx_timestamp(skb)) 335 return; 336 337 status = netif_rx (skb); 338 if (status != NET_RX_SUCCESS) 339 netif_dbg(dev, rx_err, dev->net, 340 "netif_rx status %d\n", status); 341 } 342 EXPORT_SYMBOL_GPL(usbnet_skb_return); 343 344 /* must be called if hard_mtu or rx_urb_size changed */ 345 void usbnet_update_max_qlen(struct usbnet *dev) 346 { 347 enum usb_device_speed speed = dev->udev->speed; 348 349 switch (speed) { 350 case USB_SPEED_HIGH: 351 dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size; 352 dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu; 353 break; 354 case USB_SPEED_SUPER: 355 /* 356 * Not take default 5ms qlen for super speed HC to 357 * save memory, and iperf tests show 2.5ms qlen can 358 * work well 359 */ 360 dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size; 361 dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu; 362 break; 363 default: 364 dev->rx_qlen = dev->tx_qlen = 4; 365 } 366 } 367 EXPORT_SYMBOL_GPL(usbnet_update_max_qlen); 368 369 370 /*------------------------------------------------------------------------- 371 * 372 * Network Device Driver (peer link to "Host Device", from USB host) 373 * 374 *-------------------------------------------------------------------------*/ 375 376 int usbnet_change_mtu (struct net_device *net, int new_mtu) 377 { 378 struct usbnet *dev = netdev_priv(net); 379 int ll_mtu = new_mtu + net->hard_header_len; 380 int old_hard_mtu = dev->hard_mtu; 381 int old_rx_urb_size = dev->rx_urb_size; 382 383 if (new_mtu <= 0) 384 return -EINVAL; 385 // no second zero-length packet read wanted after mtu-sized packets 386 if ((ll_mtu % dev->maxpacket) == 0) 387 return -EDOM; 388 net->mtu = new_mtu; 389 390 dev->hard_mtu = net->mtu + net->hard_header_len; 391 if (dev->rx_urb_size == old_hard_mtu) { 392 dev->rx_urb_size = dev->hard_mtu; 393 if (dev->rx_urb_size > old_rx_urb_size) 394 usbnet_unlink_rx_urbs(dev); 395 } 396 397 /* max qlen depend on hard_mtu and rx_urb_size */ 398 usbnet_update_max_qlen(dev); 399 400 return 0; 401 } 402 EXPORT_SYMBOL_GPL(usbnet_change_mtu); 403 404 /* The caller must hold list->lock */ 405 static void __usbnet_queue_skb(struct sk_buff_head *list, 406 struct sk_buff *newsk, enum skb_state state) 407 { 408 struct skb_data *entry = (struct skb_data *) newsk->cb; 409 410 __skb_queue_tail(list, newsk); 411 entry->state = state; 412 } 413 414 /*-------------------------------------------------------------------------*/ 415 416 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from 417 * completion callbacks. 2.5 should have fixed those bugs... 418 */ 419 420 static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb, 421 struct sk_buff_head *list, enum skb_state state) 422 { 423 unsigned long flags; 424 enum skb_state old_state; 425 struct skb_data *entry = (struct skb_data *) skb->cb; 426 427 spin_lock_irqsave(&list->lock, flags); 428 old_state = entry->state; 429 entry->state = state; 430 __skb_unlink(skb, list); 431 spin_unlock(&list->lock); 432 spin_lock(&dev->done.lock); 433 __skb_queue_tail(&dev->done, skb); 434 if (dev->done.qlen == 1) 435 tasklet_schedule(&dev->bh); 436 spin_unlock_irqrestore(&dev->done.lock, flags); 437 return old_state; 438 } 439 440 /* some work can't be done in tasklets, so we use keventd 441 * 442 * NOTE: annoying asymmetry: if it's active, schedule_work() fails, 443 * but tasklet_schedule() doesn't. hope the failure is rare. 444 */ 445 void usbnet_defer_kevent (struct usbnet *dev, int work) 446 { 447 set_bit (work, &dev->flags); 448 if (!schedule_work (&dev->kevent)) { 449 if (net_ratelimit()) 450 netdev_err(dev->net, "kevent %d may have been dropped\n", work); 451 } else { 452 netdev_dbg(dev->net, "kevent %d scheduled\n", work); 453 } 454 } 455 EXPORT_SYMBOL_GPL(usbnet_defer_kevent); 456 457 /*-------------------------------------------------------------------------*/ 458 459 static void rx_complete (struct urb *urb); 460 461 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) 462 { 463 struct sk_buff *skb; 464 struct skb_data *entry; 465 int retval = 0; 466 unsigned long lockflags; 467 size_t size = dev->rx_urb_size; 468 469 /* prevent rx skb allocation when error ratio is high */ 470 if (test_bit(EVENT_RX_KILL, &dev->flags)) { 471 usb_free_urb(urb); 472 return -ENOLINK; 473 } 474 475 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags); 476 if (!skb) { 477 netif_dbg(dev, rx_err, dev->net, "no rx skb\n"); 478 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 479 usb_free_urb (urb); 480 return -ENOMEM; 481 } 482 483 entry = (struct skb_data *) skb->cb; 484 entry->urb = urb; 485 entry->dev = dev; 486 entry->length = 0; 487 488 usb_fill_bulk_urb (urb, dev->udev, dev->in, 489 skb->data, size, rx_complete, skb); 490 491 spin_lock_irqsave (&dev->rxq.lock, lockflags); 492 493 if (netif_running (dev->net) && 494 netif_device_present (dev->net) && 495 !test_bit (EVENT_RX_HALT, &dev->flags) && 496 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) { 497 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) { 498 case -EPIPE: 499 usbnet_defer_kevent (dev, EVENT_RX_HALT); 500 break; 501 case -ENOMEM: 502 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 503 break; 504 case -ENODEV: 505 netif_dbg(dev, ifdown, dev->net, "device gone\n"); 506 netif_device_detach (dev->net); 507 break; 508 case -EHOSTUNREACH: 509 retval = -ENOLINK; 510 break; 511 default: 512 netif_dbg(dev, rx_err, dev->net, 513 "rx submit, %d\n", retval); 514 tasklet_schedule (&dev->bh); 515 break; 516 case 0: 517 __usbnet_queue_skb(&dev->rxq, skb, rx_start); 518 } 519 } else { 520 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n"); 521 retval = -ENOLINK; 522 } 523 spin_unlock_irqrestore (&dev->rxq.lock, lockflags); 524 if (retval) { 525 dev_kfree_skb_any (skb); 526 usb_free_urb (urb); 527 } 528 return retval; 529 } 530 531 532 /*-------------------------------------------------------------------------*/ 533 534 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb) 535 { 536 if (dev->driver_info->rx_fixup && 537 !dev->driver_info->rx_fixup (dev, skb)) { 538 /* With RX_ASSEMBLE, rx_fixup() must update counters */ 539 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE)) 540 dev->net->stats.rx_errors++; 541 goto done; 542 } 543 // else network stack removes extra byte if we forced a short packet 544 545 /* all data was already cloned from skb inside the driver */ 546 if (dev->driver_info->flags & FLAG_MULTI_PACKET) 547 goto done; 548 549 if (skb->len < ETH_HLEN) { 550 dev->net->stats.rx_errors++; 551 dev->net->stats.rx_length_errors++; 552 netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len); 553 } else { 554 usbnet_skb_return(dev, skb); 555 return; 556 } 557 558 done: 559 skb_queue_tail(&dev->done, skb); 560 } 561 562 /*-------------------------------------------------------------------------*/ 563 564 static void rx_complete (struct urb *urb) 565 { 566 struct sk_buff *skb = (struct sk_buff *) urb->context; 567 struct skb_data *entry = (struct skb_data *) skb->cb; 568 struct usbnet *dev = entry->dev; 569 int urb_status = urb->status; 570 enum skb_state state; 571 572 skb_put (skb, urb->actual_length); 573 state = rx_done; 574 entry->urb = NULL; 575 576 switch (urb_status) { 577 /* success */ 578 case 0: 579 break; 580 581 /* stalls need manual reset. this is rare ... except that 582 * when going through USB 2.0 TTs, unplug appears this way. 583 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ 584 * storm, recovering as needed. 585 */ 586 case -EPIPE: 587 dev->net->stats.rx_errors++; 588 usbnet_defer_kevent (dev, EVENT_RX_HALT); 589 // FALLTHROUGH 590 591 /* software-driven interface shutdown */ 592 case -ECONNRESET: /* async unlink */ 593 case -ESHUTDOWN: /* hardware gone */ 594 netif_dbg(dev, ifdown, dev->net, 595 "rx shutdown, code %d\n", urb_status); 596 goto block; 597 598 /* we get controller i/o faults during hub_wq disconnect() delays. 599 * throttle down resubmits, to avoid log floods; just temporarily, 600 * so we still recover when the fault isn't a hub_wq delay. 601 */ 602 case -EPROTO: 603 case -ETIME: 604 case -EILSEQ: 605 dev->net->stats.rx_errors++; 606 if (!timer_pending (&dev->delay)) { 607 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); 608 netif_dbg(dev, link, dev->net, 609 "rx throttle %d\n", urb_status); 610 } 611 block: 612 state = rx_cleanup; 613 entry->urb = urb; 614 urb = NULL; 615 break; 616 617 /* data overrun ... flush fifo? */ 618 case -EOVERFLOW: 619 dev->net->stats.rx_over_errors++; 620 // FALLTHROUGH 621 622 default: 623 state = rx_cleanup; 624 dev->net->stats.rx_errors++; 625 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status); 626 break; 627 } 628 629 /* stop rx if packet error rate is high */ 630 if (++dev->pkt_cnt > 30) { 631 dev->pkt_cnt = 0; 632 dev->pkt_err = 0; 633 } else { 634 if (state == rx_cleanup) 635 dev->pkt_err++; 636 if (dev->pkt_err > 20) 637 set_bit(EVENT_RX_KILL, &dev->flags); 638 } 639 640 state = defer_bh(dev, skb, &dev->rxq, state); 641 642 if (urb) { 643 if (netif_running (dev->net) && 644 !test_bit (EVENT_RX_HALT, &dev->flags) && 645 state != unlink_start) { 646 rx_submit (dev, urb, GFP_ATOMIC); 647 usb_mark_last_busy(dev->udev); 648 return; 649 } 650 usb_free_urb (urb); 651 } 652 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n"); 653 } 654 655 /*-------------------------------------------------------------------------*/ 656 void usbnet_pause_rx(struct usbnet *dev) 657 { 658 set_bit(EVENT_RX_PAUSED, &dev->flags); 659 660 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n"); 661 } 662 EXPORT_SYMBOL_GPL(usbnet_pause_rx); 663 664 void usbnet_resume_rx(struct usbnet *dev) 665 { 666 struct sk_buff *skb; 667 int num = 0; 668 669 clear_bit(EVENT_RX_PAUSED, &dev->flags); 670 671 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) { 672 usbnet_skb_return(dev, skb); 673 num++; 674 } 675 676 tasklet_schedule(&dev->bh); 677 678 netif_dbg(dev, rx_status, dev->net, 679 "paused rx queue disabled, %d skbs requeued\n", num); 680 } 681 EXPORT_SYMBOL_GPL(usbnet_resume_rx); 682 683 void usbnet_purge_paused_rxq(struct usbnet *dev) 684 { 685 skb_queue_purge(&dev->rxq_pause); 686 } 687 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq); 688 689 /*-------------------------------------------------------------------------*/ 690 691 // unlink pending rx/tx; completion handlers do all other cleanup 692 693 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) 694 { 695 unsigned long flags; 696 struct sk_buff *skb; 697 int count = 0; 698 699 spin_lock_irqsave (&q->lock, flags); 700 while (!skb_queue_empty(q)) { 701 struct skb_data *entry; 702 struct urb *urb; 703 int retval; 704 705 skb_queue_walk(q, skb) { 706 entry = (struct skb_data *) skb->cb; 707 if (entry->state != unlink_start) 708 goto found; 709 } 710 break; 711 found: 712 entry->state = unlink_start; 713 urb = entry->urb; 714 715 /* 716 * Get reference count of the URB to avoid it to be 717 * freed during usb_unlink_urb, which may trigger 718 * use-after-free problem inside usb_unlink_urb since 719 * usb_unlink_urb is always racing with .complete 720 * handler(include defer_bh). 721 */ 722 usb_get_urb(urb); 723 spin_unlock_irqrestore(&q->lock, flags); 724 // during some PM-driven resume scenarios, 725 // these (async) unlinks complete immediately 726 retval = usb_unlink_urb (urb); 727 if (retval != -EINPROGRESS && retval != 0) 728 netdev_dbg(dev->net, "unlink urb err, %d\n", retval); 729 else 730 count++; 731 usb_put_urb(urb); 732 spin_lock_irqsave(&q->lock, flags); 733 } 734 spin_unlock_irqrestore (&q->lock, flags); 735 return count; 736 } 737 738 // Flush all pending rx urbs 739 // minidrivers may need to do this when the MTU changes 740 741 void usbnet_unlink_rx_urbs(struct usbnet *dev) 742 { 743 if (netif_running(dev->net)) { 744 (void) unlink_urbs (dev, &dev->rxq); 745 tasklet_schedule(&dev->bh); 746 } 747 } 748 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); 749 750 /*-------------------------------------------------------------------------*/ 751 752 // precondition: never called in_interrupt 753 static void usbnet_terminate_urbs(struct usbnet *dev) 754 { 755 DECLARE_WAITQUEUE(wait, current); 756 int temp; 757 758 /* ensure there are no more active urbs */ 759 add_wait_queue(&dev->wait, &wait); 760 set_current_state(TASK_UNINTERRUPTIBLE); 761 temp = unlink_urbs(dev, &dev->txq) + 762 unlink_urbs(dev, &dev->rxq); 763 764 /* maybe wait for deletions to finish. */ 765 while (!skb_queue_empty(&dev->rxq) 766 && !skb_queue_empty(&dev->txq) 767 && !skb_queue_empty(&dev->done)) { 768 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS)); 769 set_current_state(TASK_UNINTERRUPTIBLE); 770 netif_dbg(dev, ifdown, dev->net, 771 "waited for %d urb completions\n", temp); 772 } 773 set_current_state(TASK_RUNNING); 774 remove_wait_queue(&dev->wait, &wait); 775 } 776 777 int usbnet_stop (struct net_device *net) 778 { 779 struct usbnet *dev = netdev_priv(net); 780 struct driver_info *info = dev->driver_info; 781 int retval, pm; 782 783 clear_bit(EVENT_DEV_OPEN, &dev->flags); 784 netif_stop_queue (net); 785 786 netif_info(dev, ifdown, dev->net, 787 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n", 788 net->stats.rx_packets, net->stats.tx_packets, 789 net->stats.rx_errors, net->stats.tx_errors); 790 791 /* to not race resume */ 792 pm = usb_autopm_get_interface(dev->intf); 793 /* allow minidriver to stop correctly (wireless devices to turn off 794 * radio etc) */ 795 if (info->stop) { 796 retval = info->stop(dev); 797 if (retval < 0) 798 netif_info(dev, ifdown, dev->net, 799 "stop fail (%d) usbnet usb-%s-%s, %s\n", 800 retval, 801 dev->udev->bus->bus_name, dev->udev->devpath, 802 info->description); 803 } 804 805 if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) 806 usbnet_terminate_urbs(dev); 807 808 usbnet_status_stop(dev); 809 810 usbnet_purge_paused_rxq(dev); 811 812 /* deferred work (task, timer, softirq) must also stop. 813 * can't flush_scheduled_work() until we drop rtnl (later), 814 * else workers could deadlock; so make workers a NOP. 815 */ 816 dev->flags = 0; 817 del_timer_sync (&dev->delay); 818 tasklet_kill (&dev->bh); 819 if (!pm) 820 usb_autopm_put_interface(dev->intf); 821 822 if (info->manage_power && 823 !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags)) 824 info->manage_power(dev, 0); 825 else 826 usb_autopm_put_interface(dev->intf); 827 828 return 0; 829 } 830 EXPORT_SYMBOL_GPL(usbnet_stop); 831 832 /*-------------------------------------------------------------------------*/ 833 834 // posts reads, and enables write queuing 835 836 // precondition: never called in_interrupt 837 838 int usbnet_open (struct net_device *net) 839 { 840 struct usbnet *dev = netdev_priv(net); 841 int retval; 842 struct driver_info *info = dev->driver_info; 843 844 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { 845 netif_info(dev, ifup, dev->net, 846 "resumption fail (%d) usbnet usb-%s-%s, %s\n", 847 retval, 848 dev->udev->bus->bus_name, 849 dev->udev->devpath, 850 info->description); 851 goto done_nopm; 852 } 853 854 // put into "known safe" state 855 if (info->reset && (retval = info->reset (dev)) < 0) { 856 netif_info(dev, ifup, dev->net, 857 "open reset fail (%d) usbnet usb-%s-%s, %s\n", 858 retval, 859 dev->udev->bus->bus_name, 860 dev->udev->devpath, 861 info->description); 862 goto done; 863 } 864 865 /* hard_mtu or rx_urb_size may change in reset() */ 866 usbnet_update_max_qlen(dev); 867 868 // insist peer be connected 869 if (info->check_connect && (retval = info->check_connect (dev)) < 0) { 870 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval); 871 goto done; 872 } 873 874 /* start any status interrupt transfer */ 875 if (dev->interrupt) { 876 retval = usbnet_status_start(dev, GFP_KERNEL); 877 if (retval < 0) { 878 netif_err(dev, ifup, dev->net, 879 "intr submit %d\n", retval); 880 goto done; 881 } 882 } 883 884 set_bit(EVENT_DEV_OPEN, &dev->flags); 885 netif_start_queue (net); 886 netif_info(dev, ifup, dev->net, 887 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n", 888 (int)RX_QLEN(dev), (int)TX_QLEN(dev), 889 dev->net->mtu, 890 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" : 891 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" : 892 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" : 893 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" : 894 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" : 895 "simple"); 896 897 /* reset rx error state */ 898 dev->pkt_cnt = 0; 899 dev->pkt_err = 0; 900 clear_bit(EVENT_RX_KILL, &dev->flags); 901 902 // delay posting reads until we're fully open 903 tasklet_schedule (&dev->bh); 904 if (info->manage_power) { 905 retval = info->manage_power(dev, 1); 906 if (retval < 0) { 907 retval = 0; 908 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags); 909 } else { 910 usb_autopm_put_interface(dev->intf); 911 } 912 } 913 return retval; 914 done: 915 usb_autopm_put_interface(dev->intf); 916 done_nopm: 917 return retval; 918 } 919 EXPORT_SYMBOL_GPL(usbnet_open); 920 921 /*-------------------------------------------------------------------------*/ 922 923 /* ethtool methods; minidrivers may need to add some more, but 924 * they'll probably want to use this base set. 925 */ 926 927 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd) 928 { 929 struct usbnet *dev = netdev_priv(net); 930 931 if (!dev->mii.mdio_read) 932 return -EOPNOTSUPP; 933 934 return mii_ethtool_gset(&dev->mii, cmd); 935 } 936 EXPORT_SYMBOL_GPL(usbnet_get_settings); 937 938 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd) 939 { 940 struct usbnet *dev = netdev_priv(net); 941 int retval; 942 943 if (!dev->mii.mdio_write) 944 return -EOPNOTSUPP; 945 946 retval = mii_ethtool_sset(&dev->mii, cmd); 947 948 /* link speed/duplex might have changed */ 949 if (dev->driver_info->link_reset) 950 dev->driver_info->link_reset(dev); 951 952 /* hard_mtu or rx_urb_size may change in link_reset() */ 953 usbnet_update_max_qlen(dev); 954 955 return retval; 956 957 } 958 EXPORT_SYMBOL_GPL(usbnet_set_settings); 959 960 u32 usbnet_get_link (struct net_device *net) 961 { 962 struct usbnet *dev = netdev_priv(net); 963 964 /* If a check_connect is defined, return its result */ 965 if (dev->driver_info->check_connect) 966 return dev->driver_info->check_connect (dev) == 0; 967 968 /* if the device has mii operations, use those */ 969 if (dev->mii.mdio_read) 970 return mii_link_ok(&dev->mii); 971 972 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ 973 return ethtool_op_get_link(net); 974 } 975 EXPORT_SYMBOL_GPL(usbnet_get_link); 976 977 int usbnet_nway_reset(struct net_device *net) 978 { 979 struct usbnet *dev = netdev_priv(net); 980 981 if (!dev->mii.mdio_write) 982 return -EOPNOTSUPP; 983 984 return mii_nway_restart(&dev->mii); 985 } 986 EXPORT_SYMBOL_GPL(usbnet_nway_reset); 987 988 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) 989 { 990 struct usbnet *dev = netdev_priv(net); 991 992 strlcpy (info->driver, dev->driver_name, sizeof info->driver); 993 strlcpy (info->version, DRIVER_VERSION, sizeof info->version); 994 strlcpy (info->fw_version, dev->driver_info->description, 995 sizeof info->fw_version); 996 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); 997 } 998 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); 999 1000 u32 usbnet_get_msglevel (struct net_device *net) 1001 { 1002 struct usbnet *dev = netdev_priv(net); 1003 1004 return dev->msg_enable; 1005 } 1006 EXPORT_SYMBOL_GPL(usbnet_get_msglevel); 1007 1008 void usbnet_set_msglevel (struct net_device *net, u32 level) 1009 { 1010 struct usbnet *dev = netdev_priv(net); 1011 1012 dev->msg_enable = level; 1013 } 1014 EXPORT_SYMBOL_GPL(usbnet_set_msglevel); 1015 1016 /* drivers may override default ethtool_ops in their bind() routine */ 1017 static const struct ethtool_ops usbnet_ethtool_ops = { 1018 .get_settings = usbnet_get_settings, 1019 .set_settings = usbnet_set_settings, 1020 .get_link = usbnet_get_link, 1021 .nway_reset = usbnet_nway_reset, 1022 .get_drvinfo = usbnet_get_drvinfo, 1023 .get_msglevel = usbnet_get_msglevel, 1024 .set_msglevel = usbnet_set_msglevel, 1025 .get_ts_info = ethtool_op_get_ts_info, 1026 }; 1027 1028 /*-------------------------------------------------------------------------*/ 1029 1030 static void __handle_link_change(struct usbnet *dev) 1031 { 1032 if (!test_bit(EVENT_DEV_OPEN, &dev->flags)) 1033 return; 1034 1035 if (!netif_carrier_ok(dev->net)) { 1036 /* kill URBs for reading packets to save bus bandwidth */ 1037 unlink_urbs(dev, &dev->rxq); 1038 1039 /* 1040 * tx_timeout will unlink URBs for sending packets and 1041 * tx queue is stopped by netcore after link becomes off 1042 */ 1043 } else { 1044 /* submitting URBs for reading packets */ 1045 tasklet_schedule(&dev->bh); 1046 } 1047 1048 /* hard_mtu or rx_urb_size may change during link change */ 1049 usbnet_update_max_qlen(dev); 1050 1051 clear_bit(EVENT_LINK_CHANGE, &dev->flags); 1052 } 1053 1054 static void usbnet_set_rx_mode(struct net_device *net) 1055 { 1056 struct usbnet *dev = netdev_priv(net); 1057 1058 usbnet_defer_kevent(dev, EVENT_SET_RX_MODE); 1059 } 1060 1061 static void __handle_set_rx_mode(struct usbnet *dev) 1062 { 1063 if (dev->driver_info->set_rx_mode) 1064 (dev->driver_info->set_rx_mode)(dev); 1065 1066 clear_bit(EVENT_SET_RX_MODE, &dev->flags); 1067 } 1068 1069 /* work that cannot be done in interrupt context uses keventd. 1070 * 1071 * NOTE: with 2.5 we could do more of this using completion callbacks, 1072 * especially now that control transfers can be queued. 1073 */ 1074 static void 1075 usbnet_deferred_kevent (struct work_struct *work) 1076 { 1077 struct usbnet *dev = 1078 container_of(work, struct usbnet, kevent); 1079 int status; 1080 1081 /* usb_clear_halt() needs a thread context */ 1082 if (test_bit (EVENT_TX_HALT, &dev->flags)) { 1083 unlink_urbs (dev, &dev->txq); 1084 status = usb_autopm_get_interface(dev->intf); 1085 if (status < 0) 1086 goto fail_pipe; 1087 status = usb_clear_halt (dev->udev, dev->out); 1088 usb_autopm_put_interface(dev->intf); 1089 if (status < 0 && 1090 status != -EPIPE && 1091 status != -ESHUTDOWN) { 1092 if (netif_msg_tx_err (dev)) 1093 fail_pipe: 1094 netdev_err(dev->net, "can't clear tx halt, status %d\n", 1095 status); 1096 } else { 1097 clear_bit (EVENT_TX_HALT, &dev->flags); 1098 if (status != -ESHUTDOWN) 1099 netif_wake_queue (dev->net); 1100 } 1101 } 1102 if (test_bit (EVENT_RX_HALT, &dev->flags)) { 1103 unlink_urbs (dev, &dev->rxq); 1104 status = usb_autopm_get_interface(dev->intf); 1105 if (status < 0) 1106 goto fail_halt; 1107 status = usb_clear_halt (dev->udev, dev->in); 1108 usb_autopm_put_interface(dev->intf); 1109 if (status < 0 && 1110 status != -EPIPE && 1111 status != -ESHUTDOWN) { 1112 if (netif_msg_rx_err (dev)) 1113 fail_halt: 1114 netdev_err(dev->net, "can't clear rx halt, status %d\n", 1115 status); 1116 } else { 1117 clear_bit (EVENT_RX_HALT, &dev->flags); 1118 tasklet_schedule (&dev->bh); 1119 } 1120 } 1121 1122 /* tasklet could resubmit itself forever if memory is tight */ 1123 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { 1124 struct urb *urb = NULL; 1125 int resched = 1; 1126 1127 if (netif_running (dev->net)) 1128 urb = usb_alloc_urb (0, GFP_KERNEL); 1129 else 1130 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1131 if (urb != NULL) { 1132 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1133 status = usb_autopm_get_interface(dev->intf); 1134 if (status < 0) { 1135 usb_free_urb(urb); 1136 goto fail_lowmem; 1137 } 1138 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) 1139 resched = 0; 1140 usb_autopm_put_interface(dev->intf); 1141 fail_lowmem: 1142 if (resched) 1143 tasklet_schedule (&dev->bh); 1144 } 1145 } 1146 1147 if (test_bit (EVENT_LINK_RESET, &dev->flags)) { 1148 struct driver_info *info = dev->driver_info; 1149 int retval = 0; 1150 1151 clear_bit (EVENT_LINK_RESET, &dev->flags); 1152 status = usb_autopm_get_interface(dev->intf); 1153 if (status < 0) 1154 goto skip_reset; 1155 if(info->link_reset && (retval = info->link_reset(dev)) < 0) { 1156 usb_autopm_put_interface(dev->intf); 1157 skip_reset: 1158 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", 1159 retval, 1160 dev->udev->bus->bus_name, 1161 dev->udev->devpath, 1162 info->description); 1163 } else { 1164 usb_autopm_put_interface(dev->intf); 1165 } 1166 1167 /* handle link change from link resetting */ 1168 __handle_link_change(dev); 1169 } 1170 1171 if (test_bit (EVENT_LINK_CHANGE, &dev->flags)) 1172 __handle_link_change(dev); 1173 1174 if (test_bit (EVENT_SET_RX_MODE, &dev->flags)) 1175 __handle_set_rx_mode(dev); 1176 1177 1178 if (dev->flags) 1179 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); 1180 } 1181 1182 /*-------------------------------------------------------------------------*/ 1183 1184 static void tx_complete (struct urb *urb) 1185 { 1186 struct sk_buff *skb = (struct sk_buff *) urb->context; 1187 struct skb_data *entry = (struct skb_data *) skb->cb; 1188 struct usbnet *dev = entry->dev; 1189 1190 if (urb->status == 0) { 1191 dev->net->stats.tx_packets += entry->packets; 1192 dev->net->stats.tx_bytes += entry->length; 1193 } else { 1194 dev->net->stats.tx_errors++; 1195 1196 switch (urb->status) { 1197 case -EPIPE: 1198 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1199 break; 1200 1201 /* software-driven interface shutdown */ 1202 case -ECONNRESET: // async unlink 1203 case -ESHUTDOWN: // hardware gone 1204 break; 1205 1206 /* like rx, tx gets controller i/o faults during hub_wq 1207 * delays and so it uses the same throttling mechanism. 1208 */ 1209 case -EPROTO: 1210 case -ETIME: 1211 case -EILSEQ: 1212 usb_mark_last_busy(dev->udev); 1213 if (!timer_pending (&dev->delay)) { 1214 mod_timer (&dev->delay, 1215 jiffies + THROTTLE_JIFFIES); 1216 netif_dbg(dev, link, dev->net, 1217 "tx throttle %d\n", urb->status); 1218 } 1219 netif_stop_queue (dev->net); 1220 break; 1221 default: 1222 netif_dbg(dev, tx_err, dev->net, 1223 "tx err %d\n", entry->urb->status); 1224 break; 1225 } 1226 } 1227 1228 usb_autopm_put_interface_async(dev->intf); 1229 (void) defer_bh(dev, skb, &dev->txq, tx_done); 1230 } 1231 1232 /*-------------------------------------------------------------------------*/ 1233 1234 void usbnet_tx_timeout (struct net_device *net) 1235 { 1236 struct usbnet *dev = netdev_priv(net); 1237 1238 unlink_urbs (dev, &dev->txq); 1239 tasklet_schedule (&dev->bh); 1240 /* this needs to be handled individually because the generic layer 1241 * doesn't know what is sufficient and could not restore private 1242 * information if a remedy of an unconditional reset were used. 1243 */ 1244 if (dev->driver_info->recover) 1245 (dev->driver_info->recover)(dev); 1246 } 1247 EXPORT_SYMBOL_GPL(usbnet_tx_timeout); 1248 1249 /*-------------------------------------------------------------------------*/ 1250 1251 static int build_dma_sg(const struct sk_buff *skb, struct urb *urb) 1252 { 1253 unsigned num_sgs, total_len = 0; 1254 int i, s = 0; 1255 1256 num_sgs = skb_shinfo(skb)->nr_frags + 1; 1257 if (num_sgs == 1) 1258 return 0; 1259 1260 /* reserve one for zero packet */ 1261 urb->sg = kmalloc((num_sgs + 1) * sizeof(struct scatterlist), 1262 GFP_ATOMIC); 1263 if (!urb->sg) 1264 return -ENOMEM; 1265 1266 urb->num_sgs = num_sgs; 1267 sg_init_table(urb->sg, urb->num_sgs + 1); 1268 1269 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb)); 1270 total_len += skb_headlen(skb); 1271 1272 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1273 struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i]; 1274 1275 total_len += skb_frag_size(f); 1276 sg_set_page(&urb->sg[i + s], f->page.p, f->size, 1277 f->page_offset); 1278 } 1279 urb->transfer_buffer_length = total_len; 1280 1281 return 1; 1282 } 1283 1284 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, 1285 struct net_device *net) 1286 { 1287 struct usbnet *dev = netdev_priv(net); 1288 unsigned int length; 1289 struct urb *urb = NULL; 1290 struct skb_data *entry; 1291 struct driver_info *info = dev->driver_info; 1292 unsigned long flags; 1293 int retval; 1294 1295 if (skb) 1296 skb_tx_timestamp(skb); 1297 1298 // some devices want funky USB-level framing, for 1299 // win32 driver (usually) and/or hardware quirks 1300 if (info->tx_fixup) { 1301 skb = info->tx_fixup (dev, skb, GFP_ATOMIC); 1302 if (!skb) { 1303 /* packet collected; minidriver waiting for more */ 1304 if (info->flags & FLAG_MULTI_PACKET) 1305 goto not_drop; 1306 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); 1307 goto drop; 1308 } 1309 } 1310 1311 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { 1312 netif_dbg(dev, tx_err, dev->net, "no urb\n"); 1313 goto drop; 1314 } 1315 1316 entry = (struct skb_data *) skb->cb; 1317 entry->urb = urb; 1318 entry->dev = dev; 1319 1320 usb_fill_bulk_urb (urb, dev->udev, dev->out, 1321 skb->data, skb->len, tx_complete, skb); 1322 if (dev->can_dma_sg) { 1323 if (build_dma_sg(skb, urb) < 0) 1324 goto drop; 1325 } 1326 length = urb->transfer_buffer_length; 1327 1328 /* don't assume the hardware handles USB_ZERO_PACKET 1329 * NOTE: strictly conforming cdc-ether devices should expect 1330 * the ZLP here, but ignore the one-byte packet. 1331 * NOTE2: CDC NCM specification is different from CDC ECM when 1332 * handling ZLP/short packets, so cdc_ncm driver will make short 1333 * packet itself if needed. 1334 */ 1335 if (length % dev->maxpacket == 0) { 1336 if (!(info->flags & FLAG_SEND_ZLP)) { 1337 if (!(info->flags & FLAG_MULTI_PACKET)) { 1338 length++; 1339 if (skb_tailroom(skb) && !urb->num_sgs) { 1340 skb->data[skb->len] = 0; 1341 __skb_put(skb, 1); 1342 } else if (urb->num_sgs) 1343 sg_set_buf(&urb->sg[urb->num_sgs++], 1344 dev->padding_pkt, 1); 1345 } 1346 } else 1347 urb->transfer_flags |= URB_ZERO_PACKET; 1348 } 1349 urb->transfer_buffer_length = length; 1350 1351 if (info->flags & FLAG_MULTI_PACKET) { 1352 /* Driver has set number of packets and a length delta. 1353 * Calculate the complete length and ensure that it's 1354 * positive. 1355 */ 1356 entry->length += length; 1357 if (WARN_ON_ONCE(entry->length <= 0)) 1358 entry->length = length; 1359 } else { 1360 usbnet_set_skb_tx_stats(skb, 1, length); 1361 } 1362 1363 spin_lock_irqsave(&dev->txq.lock, flags); 1364 retval = usb_autopm_get_interface_async(dev->intf); 1365 if (retval < 0) { 1366 spin_unlock_irqrestore(&dev->txq.lock, flags); 1367 goto drop; 1368 } 1369 1370 #ifdef CONFIG_PM 1371 /* if this triggers the device is still a sleep */ 1372 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { 1373 /* transmission will be done in resume */ 1374 usb_anchor_urb(urb, &dev->deferred); 1375 /* no use to process more packets */ 1376 netif_stop_queue(net); 1377 usb_put_urb(urb); 1378 spin_unlock_irqrestore(&dev->txq.lock, flags); 1379 netdev_dbg(dev->net, "Delaying transmission for resumption\n"); 1380 goto deferred; 1381 } 1382 #endif 1383 1384 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { 1385 case -EPIPE: 1386 netif_stop_queue (net); 1387 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1388 usb_autopm_put_interface_async(dev->intf); 1389 break; 1390 default: 1391 usb_autopm_put_interface_async(dev->intf); 1392 netif_dbg(dev, tx_err, dev->net, 1393 "tx: submit urb err %d\n", retval); 1394 break; 1395 case 0: 1396 net->trans_start = jiffies; 1397 __usbnet_queue_skb(&dev->txq, skb, tx_start); 1398 if (dev->txq.qlen >= TX_QLEN (dev)) 1399 netif_stop_queue (net); 1400 } 1401 spin_unlock_irqrestore (&dev->txq.lock, flags); 1402 1403 if (retval) { 1404 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); 1405 drop: 1406 dev->net->stats.tx_dropped++; 1407 not_drop: 1408 if (skb) 1409 dev_kfree_skb_any (skb); 1410 if (urb) { 1411 kfree(urb->sg); 1412 usb_free_urb(urb); 1413 } 1414 } else 1415 netif_dbg(dev, tx_queued, dev->net, 1416 "> tx, len %u, type 0x%x\n", length, skb->protocol); 1417 #ifdef CONFIG_PM 1418 deferred: 1419 #endif 1420 return NETDEV_TX_OK; 1421 } 1422 EXPORT_SYMBOL_GPL(usbnet_start_xmit); 1423 1424 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags) 1425 { 1426 struct urb *urb; 1427 int i; 1428 int ret = 0; 1429 1430 /* don't refill the queue all at once */ 1431 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) { 1432 urb = usb_alloc_urb(0, flags); 1433 if (urb != NULL) { 1434 ret = rx_submit(dev, urb, flags); 1435 if (ret) 1436 goto err; 1437 } else { 1438 ret = -ENOMEM; 1439 goto err; 1440 } 1441 } 1442 err: 1443 return ret; 1444 } 1445 1446 /*-------------------------------------------------------------------------*/ 1447 1448 // tasklet (work deferred from completions, in_irq) or timer 1449 1450 static void usbnet_bh (unsigned long param) 1451 { 1452 struct usbnet *dev = (struct usbnet *) param; 1453 struct sk_buff *skb; 1454 struct skb_data *entry; 1455 1456 while ((skb = skb_dequeue (&dev->done))) { 1457 entry = (struct skb_data *) skb->cb; 1458 switch (entry->state) { 1459 case rx_done: 1460 entry->state = rx_cleanup; 1461 rx_process (dev, skb); 1462 continue; 1463 case tx_done: 1464 kfree(entry->urb->sg); 1465 case rx_cleanup: 1466 usb_free_urb (entry->urb); 1467 dev_kfree_skb (skb); 1468 continue; 1469 default: 1470 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); 1471 } 1472 } 1473 1474 /* restart RX again after disabling due to high error rate */ 1475 clear_bit(EVENT_RX_KILL, &dev->flags); 1476 1477 /* waiting for all pending urbs to complete? 1478 * only then can we forgo submitting anew 1479 */ 1480 if (waitqueue_active(&dev->wait)) { 1481 if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0) 1482 wake_up_all(&dev->wait); 1483 1484 // or are we maybe short a few urbs? 1485 } else if (netif_running (dev->net) && 1486 netif_device_present (dev->net) && 1487 netif_carrier_ok(dev->net) && 1488 !timer_pending (&dev->delay) && 1489 !test_bit (EVENT_RX_HALT, &dev->flags)) { 1490 int temp = dev->rxq.qlen; 1491 1492 if (temp < RX_QLEN(dev)) { 1493 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK) 1494 return; 1495 if (temp != dev->rxq.qlen) 1496 netif_dbg(dev, link, dev->net, 1497 "rxqlen %d --> %d\n", 1498 temp, dev->rxq.qlen); 1499 if (dev->rxq.qlen < RX_QLEN(dev)) 1500 tasklet_schedule (&dev->bh); 1501 } 1502 if (dev->txq.qlen < TX_QLEN (dev)) 1503 netif_wake_queue (dev->net); 1504 } 1505 } 1506 1507 1508 /*------------------------------------------------------------------------- 1509 * 1510 * USB Device Driver support 1511 * 1512 *-------------------------------------------------------------------------*/ 1513 1514 // precondition: never called in_interrupt 1515 1516 void usbnet_disconnect (struct usb_interface *intf) 1517 { 1518 struct usbnet *dev; 1519 struct usb_device *xdev; 1520 struct net_device *net; 1521 1522 dev = usb_get_intfdata(intf); 1523 usb_set_intfdata(intf, NULL); 1524 if (!dev) 1525 return; 1526 1527 xdev = interface_to_usbdev (intf); 1528 1529 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", 1530 intf->dev.driver->name, 1531 xdev->bus->bus_name, xdev->devpath, 1532 dev->driver_info->description); 1533 1534 net = dev->net; 1535 unregister_netdev (net); 1536 1537 cancel_work_sync(&dev->kevent); 1538 1539 usb_scuttle_anchored_urbs(&dev->deferred); 1540 1541 if (dev->driver_info->unbind) 1542 dev->driver_info->unbind (dev, intf); 1543 1544 usb_kill_urb(dev->interrupt); 1545 usb_free_urb(dev->interrupt); 1546 kfree(dev->padding_pkt); 1547 1548 free_netdev(net); 1549 } 1550 EXPORT_SYMBOL_GPL(usbnet_disconnect); 1551 1552 static const struct net_device_ops usbnet_netdev_ops = { 1553 .ndo_open = usbnet_open, 1554 .ndo_stop = usbnet_stop, 1555 .ndo_start_xmit = usbnet_start_xmit, 1556 .ndo_tx_timeout = usbnet_tx_timeout, 1557 .ndo_set_rx_mode = usbnet_set_rx_mode, 1558 .ndo_change_mtu = usbnet_change_mtu, 1559 .ndo_set_mac_address = eth_mac_addr, 1560 .ndo_validate_addr = eth_validate_addr, 1561 }; 1562 1563 /*-------------------------------------------------------------------------*/ 1564 1565 // precondition: never called in_interrupt 1566 1567 static struct device_type wlan_type = { 1568 .name = "wlan", 1569 }; 1570 1571 static struct device_type wwan_type = { 1572 .name = "wwan", 1573 }; 1574 1575 int 1576 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) 1577 { 1578 struct usbnet *dev; 1579 struct net_device *net; 1580 struct usb_host_interface *interface; 1581 struct driver_info *info; 1582 struct usb_device *xdev; 1583 int status; 1584 const char *name; 1585 struct usb_driver *driver = to_usb_driver(udev->dev.driver); 1586 1587 /* usbnet already took usb runtime pm, so have to enable the feature 1588 * for usb interface, otherwise usb_autopm_get_interface may return 1589 * failure if RUNTIME_PM is enabled. 1590 */ 1591 if (!driver->supports_autosuspend) { 1592 driver->supports_autosuspend = 1; 1593 pm_runtime_enable(&udev->dev); 1594 } 1595 1596 name = udev->dev.driver->name; 1597 info = (struct driver_info *) prod->driver_info; 1598 if (!info) { 1599 dev_dbg (&udev->dev, "blacklisted by %s\n", name); 1600 return -ENODEV; 1601 } 1602 xdev = interface_to_usbdev (udev); 1603 interface = udev->cur_altsetting; 1604 1605 status = -ENOMEM; 1606 1607 // set up our own records 1608 net = alloc_etherdev(sizeof(*dev)); 1609 if (!net) 1610 goto out; 1611 1612 /* netdev_printk() needs this so do it as early as possible */ 1613 SET_NETDEV_DEV(net, &udev->dev); 1614 1615 dev = netdev_priv(net); 1616 dev->udev = xdev; 1617 dev->intf = udev; 1618 dev->driver_info = info; 1619 dev->driver_name = name; 1620 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV 1621 | NETIF_MSG_PROBE | NETIF_MSG_LINK); 1622 init_waitqueue_head(&dev->wait); 1623 skb_queue_head_init (&dev->rxq); 1624 skb_queue_head_init (&dev->txq); 1625 skb_queue_head_init (&dev->done); 1626 skb_queue_head_init(&dev->rxq_pause); 1627 dev->bh.func = usbnet_bh; 1628 dev->bh.data = (unsigned long) dev; 1629 INIT_WORK (&dev->kevent, usbnet_deferred_kevent); 1630 init_usb_anchor(&dev->deferred); 1631 dev->delay.function = usbnet_bh; 1632 dev->delay.data = (unsigned long) dev; 1633 init_timer (&dev->delay); 1634 mutex_init (&dev->phy_mutex); 1635 mutex_init(&dev->interrupt_mutex); 1636 dev->interrupt_count = 0; 1637 1638 dev->net = net; 1639 strcpy (net->name, "usb%d"); 1640 memcpy (net->dev_addr, node_id, sizeof node_id); 1641 1642 /* rx and tx sides can use different message sizes; 1643 * bind() should set rx_urb_size in that case. 1644 */ 1645 dev->hard_mtu = net->mtu + net->hard_header_len; 1646 #if 0 1647 // dma_supported() is deeply broken on almost all architectures 1648 // possible with some EHCI controllers 1649 if (dma_supported (&udev->dev, DMA_BIT_MASK(64))) 1650 net->features |= NETIF_F_HIGHDMA; 1651 #endif 1652 1653 net->netdev_ops = &usbnet_netdev_ops; 1654 net->watchdog_timeo = TX_TIMEOUT_JIFFIES; 1655 net->ethtool_ops = &usbnet_ethtool_ops; 1656 1657 // allow device-specific bind/init procedures 1658 // NOTE net->name still not usable ... 1659 if (info->bind) { 1660 status = info->bind (dev, udev); 1661 if (status < 0) 1662 goto out1; 1663 1664 // heuristic: "usb%d" for links we know are two-host, 1665 // else "eth%d" when there's reasonable doubt. userspace 1666 // can rename the link if it knows better. 1667 if ((dev->driver_info->flags & FLAG_ETHER) != 0 && 1668 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 || 1669 (net->dev_addr [0] & 0x02) == 0)) 1670 strcpy (net->name, "eth%d"); 1671 /* WLAN devices should always be named "wlan%d" */ 1672 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1673 strcpy(net->name, "wlan%d"); 1674 /* WWAN devices should always be named "wwan%d" */ 1675 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1676 strcpy(net->name, "wwan%d"); 1677 1678 /* devices that cannot do ARP */ 1679 if ((dev->driver_info->flags & FLAG_NOARP) != 0) 1680 net->flags |= IFF_NOARP; 1681 1682 /* maybe the remote can't receive an Ethernet MTU */ 1683 if (net->mtu > (dev->hard_mtu - net->hard_header_len)) 1684 net->mtu = dev->hard_mtu - net->hard_header_len; 1685 } else if (!info->in || !info->out) 1686 status = usbnet_get_endpoints (dev, udev); 1687 else { 1688 dev->in = usb_rcvbulkpipe (xdev, info->in); 1689 dev->out = usb_sndbulkpipe (xdev, info->out); 1690 if (!(info->flags & FLAG_NO_SETINT)) 1691 status = usb_set_interface (xdev, 1692 interface->desc.bInterfaceNumber, 1693 interface->desc.bAlternateSetting); 1694 else 1695 status = 0; 1696 1697 } 1698 if (status >= 0 && dev->status) 1699 status = init_status (dev, udev); 1700 if (status < 0) 1701 goto out3; 1702 1703 if (!dev->rx_urb_size) 1704 dev->rx_urb_size = dev->hard_mtu; 1705 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); 1706 1707 /* let userspace know we have a random address */ 1708 if (ether_addr_equal(net->dev_addr, node_id)) 1709 net->addr_assign_type = NET_ADDR_RANDOM; 1710 1711 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1712 SET_NETDEV_DEVTYPE(net, &wlan_type); 1713 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1714 SET_NETDEV_DEVTYPE(net, &wwan_type); 1715 1716 /* initialize max rx_qlen and tx_qlen */ 1717 usbnet_update_max_qlen(dev); 1718 1719 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) && 1720 !(info->flags & FLAG_MULTI_PACKET)) { 1721 dev->padding_pkt = kzalloc(1, GFP_KERNEL); 1722 if (!dev->padding_pkt) { 1723 status = -ENOMEM; 1724 goto out4; 1725 } 1726 } 1727 1728 status = register_netdev (net); 1729 if (status) 1730 goto out5; 1731 netif_info(dev, probe, dev->net, 1732 "register '%s' at usb-%s-%s, %s, %pM\n", 1733 udev->dev.driver->name, 1734 xdev->bus->bus_name, xdev->devpath, 1735 dev->driver_info->description, 1736 net->dev_addr); 1737 1738 // ok, it's ready to go. 1739 usb_set_intfdata (udev, dev); 1740 1741 netif_device_attach (net); 1742 1743 if (dev->driver_info->flags & FLAG_LINK_INTR) 1744 usbnet_link_change(dev, 0, 0); 1745 1746 return 0; 1747 1748 out5: 1749 kfree(dev->padding_pkt); 1750 out4: 1751 usb_free_urb(dev->interrupt); 1752 out3: 1753 if (info->unbind) 1754 info->unbind (dev, udev); 1755 out1: 1756 free_netdev(net); 1757 out: 1758 return status; 1759 } 1760 EXPORT_SYMBOL_GPL(usbnet_probe); 1761 1762 /*-------------------------------------------------------------------------*/ 1763 1764 /* 1765 * suspend the whole driver as soon as the first interface is suspended 1766 * resume only when the last interface is resumed 1767 */ 1768 1769 int usbnet_suspend (struct usb_interface *intf, pm_message_t message) 1770 { 1771 struct usbnet *dev = usb_get_intfdata(intf); 1772 1773 if (!dev->suspend_count++) { 1774 spin_lock_irq(&dev->txq.lock); 1775 /* don't autosuspend while transmitting */ 1776 if (dev->txq.qlen && PMSG_IS_AUTO(message)) { 1777 dev->suspend_count--; 1778 spin_unlock_irq(&dev->txq.lock); 1779 return -EBUSY; 1780 } else { 1781 set_bit(EVENT_DEV_ASLEEP, &dev->flags); 1782 spin_unlock_irq(&dev->txq.lock); 1783 } 1784 /* 1785 * accelerate emptying of the rx and queues, to avoid 1786 * having everything error out. 1787 */ 1788 netif_device_detach (dev->net); 1789 usbnet_terminate_urbs(dev); 1790 __usbnet_status_stop_force(dev); 1791 1792 /* 1793 * reattach so runtime management can use and 1794 * wake the device 1795 */ 1796 netif_device_attach (dev->net); 1797 } 1798 return 0; 1799 } 1800 EXPORT_SYMBOL_GPL(usbnet_suspend); 1801 1802 int usbnet_resume (struct usb_interface *intf) 1803 { 1804 struct usbnet *dev = usb_get_intfdata(intf); 1805 struct sk_buff *skb; 1806 struct urb *res; 1807 int retval; 1808 1809 if (!--dev->suspend_count) { 1810 /* resume interrupt URB if it was previously submitted */ 1811 __usbnet_status_start_force(dev, GFP_NOIO); 1812 1813 spin_lock_irq(&dev->txq.lock); 1814 while ((res = usb_get_from_anchor(&dev->deferred))) { 1815 1816 skb = (struct sk_buff *)res->context; 1817 retval = usb_submit_urb(res, GFP_ATOMIC); 1818 if (retval < 0) { 1819 dev_kfree_skb_any(skb); 1820 kfree(res->sg); 1821 usb_free_urb(res); 1822 usb_autopm_put_interface_async(dev->intf); 1823 } else { 1824 dev->net->trans_start = jiffies; 1825 __skb_queue_tail(&dev->txq, skb); 1826 } 1827 } 1828 1829 smp_mb(); 1830 clear_bit(EVENT_DEV_ASLEEP, &dev->flags); 1831 spin_unlock_irq(&dev->txq.lock); 1832 1833 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) { 1834 /* handle remote wakeup ASAP 1835 * we cannot race against stop 1836 */ 1837 if (netif_device_present(dev->net) && 1838 !timer_pending(&dev->delay) && 1839 !test_bit(EVENT_RX_HALT, &dev->flags)) 1840 rx_alloc_submit(dev, GFP_NOIO); 1841 1842 if (!(dev->txq.qlen >= TX_QLEN(dev))) 1843 netif_tx_wake_all_queues(dev->net); 1844 tasklet_schedule (&dev->bh); 1845 } 1846 } 1847 1848 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) 1849 usb_autopm_get_interface_no_resume(intf); 1850 1851 return 0; 1852 } 1853 EXPORT_SYMBOL_GPL(usbnet_resume); 1854 1855 /* 1856 * Either a subdriver implements manage_power, then it is assumed to always 1857 * be ready to be suspended or it reports the readiness to be suspended 1858 * explicitly 1859 */ 1860 void usbnet_device_suggests_idle(struct usbnet *dev) 1861 { 1862 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) { 1863 dev->intf->needs_remote_wakeup = 1; 1864 usb_autopm_put_interface_async(dev->intf); 1865 } 1866 } 1867 EXPORT_SYMBOL(usbnet_device_suggests_idle); 1868 1869 /* 1870 * For devices that can do without special commands 1871 */ 1872 int usbnet_manage_power(struct usbnet *dev, int on) 1873 { 1874 dev->intf->needs_remote_wakeup = on; 1875 return 0; 1876 } 1877 EXPORT_SYMBOL(usbnet_manage_power); 1878 1879 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset) 1880 { 1881 /* update link after link is reseted */ 1882 if (link && !need_reset) 1883 netif_carrier_on(dev->net); 1884 else 1885 netif_carrier_off(dev->net); 1886 1887 if (need_reset && link) 1888 usbnet_defer_kevent(dev, EVENT_LINK_RESET); 1889 else 1890 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE); 1891 } 1892 EXPORT_SYMBOL(usbnet_link_change); 1893 1894 /*-------------------------------------------------------------------------*/ 1895 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1896 u16 value, u16 index, void *data, u16 size) 1897 { 1898 void *buf = NULL; 1899 int err = -ENOMEM; 1900 1901 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x" 1902 " value=0x%04x index=0x%04x size=%d\n", 1903 cmd, reqtype, value, index, size); 1904 1905 if (data) { 1906 buf = kmalloc(size, GFP_KERNEL); 1907 if (!buf) 1908 goto out; 1909 } 1910 1911 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), 1912 cmd, reqtype, value, index, buf, size, 1913 USB_CTRL_GET_TIMEOUT); 1914 if (err > 0 && err <= size) 1915 memcpy(data, buf, err); 1916 kfree(buf); 1917 out: 1918 return err; 1919 } 1920 1921 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1922 u16 value, u16 index, const void *data, 1923 u16 size) 1924 { 1925 void *buf = NULL; 1926 int err = -ENOMEM; 1927 1928 netdev_dbg(dev->net, "usbnet_write_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 = kmemdup(data, size, GFP_KERNEL); 1934 if (!buf) 1935 goto out; 1936 } 1937 1938 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), 1939 cmd, reqtype, value, index, buf, size, 1940 USB_CTRL_SET_TIMEOUT); 1941 kfree(buf); 1942 1943 out: 1944 return err; 1945 } 1946 1947 /* 1948 * The function can't be called inside suspend/resume callback, 1949 * otherwise deadlock will be caused. 1950 */ 1951 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1952 u16 value, u16 index, void *data, u16 size) 1953 { 1954 int ret; 1955 1956 if (usb_autopm_get_interface(dev->intf) < 0) 1957 return -ENODEV; 1958 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index, 1959 data, size); 1960 usb_autopm_put_interface(dev->intf); 1961 return ret; 1962 } 1963 EXPORT_SYMBOL_GPL(usbnet_read_cmd); 1964 1965 /* 1966 * The function can't be called inside suspend/resume callback, 1967 * otherwise deadlock will be caused. 1968 */ 1969 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1970 u16 value, u16 index, const void *data, u16 size) 1971 { 1972 int ret; 1973 1974 if (usb_autopm_get_interface(dev->intf) < 0) 1975 return -ENODEV; 1976 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index, 1977 data, size); 1978 usb_autopm_put_interface(dev->intf); 1979 return ret; 1980 } 1981 EXPORT_SYMBOL_GPL(usbnet_write_cmd); 1982 1983 /* 1984 * The function can be called inside suspend/resume callback safely 1985 * and should only be called by suspend/resume callback generally. 1986 */ 1987 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 1988 u16 value, u16 index, void *data, u16 size) 1989 { 1990 return __usbnet_read_cmd(dev, cmd, reqtype, value, index, 1991 data, size); 1992 } 1993 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm); 1994 1995 /* 1996 * The function can be called inside suspend/resume callback safely 1997 * and should only be called by suspend/resume callback generally. 1998 */ 1999 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 2000 u16 value, u16 index, const void *data, 2001 u16 size) 2002 { 2003 return __usbnet_write_cmd(dev, cmd, reqtype, value, index, 2004 data, size); 2005 } 2006 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm); 2007 2008 static void usbnet_async_cmd_cb(struct urb *urb) 2009 { 2010 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context; 2011 int status = urb->status; 2012 2013 if (status < 0) 2014 dev_dbg(&urb->dev->dev, "%s failed with %d", 2015 __func__, status); 2016 2017 kfree(req); 2018 usb_free_urb(urb); 2019 } 2020 2021 /* 2022 * The caller must make sure that device can't be put into suspend 2023 * state until the control URB completes. 2024 */ 2025 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype, 2026 u16 value, u16 index, const void *data, u16 size) 2027 { 2028 struct usb_ctrlrequest *req = NULL; 2029 struct urb *urb; 2030 int err = -ENOMEM; 2031 void *buf = NULL; 2032 2033 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 2034 " value=0x%04x index=0x%04x size=%d\n", 2035 cmd, reqtype, value, index, size); 2036 2037 urb = usb_alloc_urb(0, GFP_ATOMIC); 2038 if (!urb) { 2039 netdev_err(dev->net, "Error allocating URB in" 2040 " %s!\n", __func__); 2041 goto fail; 2042 } 2043 2044 if (data) { 2045 buf = kmemdup(data, size, GFP_ATOMIC); 2046 if (!buf) { 2047 netdev_err(dev->net, "Error allocating buffer" 2048 " in %s!\n", __func__); 2049 goto fail_free; 2050 } 2051 } 2052 2053 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC); 2054 if (!req) 2055 goto fail_free_buf; 2056 2057 req->bRequestType = reqtype; 2058 req->bRequest = cmd; 2059 req->wValue = cpu_to_le16(value); 2060 req->wIndex = cpu_to_le16(index); 2061 req->wLength = cpu_to_le16(size); 2062 2063 usb_fill_control_urb(urb, dev->udev, 2064 usb_sndctrlpipe(dev->udev, 0), 2065 (void *)req, buf, size, 2066 usbnet_async_cmd_cb, req); 2067 urb->transfer_flags |= URB_FREE_BUFFER; 2068 2069 err = usb_submit_urb(urb, GFP_ATOMIC); 2070 if (err < 0) { 2071 netdev_err(dev->net, "Error submitting the control" 2072 " message: status=%d\n", err); 2073 goto fail_free; 2074 } 2075 return 0; 2076 2077 fail_free_buf: 2078 kfree(buf); 2079 fail_free: 2080 kfree(req); 2081 usb_free_urb(urb); 2082 fail: 2083 return err; 2084 2085 } 2086 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async); 2087 /*-------------------------------------------------------------------------*/ 2088 2089 static int __init usbnet_init(void) 2090 { 2091 /* Compiler should optimize this out. */ 2092 BUILD_BUG_ON( 2093 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data)); 2094 2095 eth_random_addr(node_id); 2096 return 0; 2097 } 2098 module_init(usbnet_init); 2099 2100 static void __exit usbnet_exit(void) 2101 { 2102 } 2103 module_exit(usbnet_exit); 2104 2105 MODULE_AUTHOR("David Brownell"); 2106 MODULE_DESCRIPTION("USB network driver framework"); 2107 MODULE_LICENSE("GPL"); 2108