1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * USB Network driver infrastructure 4 * Copyright (C) 2000-2005 by David Brownell 5 * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com> 6 */ 7 8 /* 9 * This is a generic "USB networking" framework that works with several 10 * kinds of full and high speed networking devices: host-to-host cables, 11 * smart usb peripherals, and actual Ethernet adapters. 12 * 13 * These devices usually differ in terms of control protocols (if they 14 * even have one!) and sometimes they define new framing to wrap or batch 15 * Ethernet packets. Otherwise, they talk to USB pretty much the same, 16 * so interface (un)binding, endpoint I/O queues, fault handling, and other 17 * issues can usefully be addressed by this framework. 18 */ 19 20 // #define DEBUG // error path messages, extra info 21 // #define VERBOSE // more; success messages 22 23 #include <linux/module.h> 24 #include <linux/init.h> 25 #include <linux/netdevice.h> 26 #include <linux/etherdevice.h> 27 #include <linux/ctype.h> 28 #include <linux/ethtool.h> 29 #include <linux/workqueue.h> 30 #include <linux/mii.h> 31 #include <linux/usb.h> 32 #include <linux/usb/usbnet.h> 33 #include <linux/slab.h> 34 #include <linux/kernel.h> 35 #include <linux/pm_runtime.h> 36 37 #define DRIVER_VERSION "22-Aug-2005" 38 39 40 /*-------------------------------------------------------------------------*/ 41 42 /* 43 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max. 44 * Several dozen bytes of IPv4 data can fit in two such transactions. 45 * One maximum size Ethernet packet takes twenty four of them. 46 * For high speed, each frame comfortably fits almost 36 max size 47 * Ethernet packets (so queues should be bigger). 48 * 49 * The goal is to let the USB host controller be busy for 5msec or 50 * more before an irq is required, under load. Jumbograms change 51 * the equation. 52 */ 53 #define MAX_QUEUE_MEMORY (60 * 1518) 54 #define RX_QLEN(dev) ((dev)->rx_qlen) 55 #define TX_QLEN(dev) ((dev)->tx_qlen) 56 57 // reawaken network queue this soon after stopping; else watchdog barks 58 #define TX_TIMEOUT_JIFFIES (5*HZ) 59 60 /* throttle rx/tx briefly after some faults, so hub_wq might disconnect() 61 * us (it polls at HZ/4 usually) before we report too many false errors. 62 */ 63 #define THROTTLE_JIFFIES (HZ/8) 64 65 // between wakeups 66 #define UNLINK_TIMEOUT_MS 3 67 68 /*-------------------------------------------------------------------------*/ 69 70 // randomly generated ethernet address 71 static u8 node_id [ETH_ALEN]; 72 73 /* use ethtool to change the level for any given device */ 74 static int msg_level = -1; 75 module_param (msg_level, int, 0); 76 MODULE_PARM_DESC (msg_level, "Override default message level"); 77 78 /*-------------------------------------------------------------------------*/ 79 80 /* handles CDC Ethernet and many other network "bulk data" interfaces */ 81 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf) 82 { 83 int tmp; 84 struct usb_host_interface *alt = NULL; 85 struct usb_host_endpoint *in = NULL, *out = NULL; 86 struct usb_host_endpoint *status = NULL; 87 88 for (tmp = 0; tmp < intf->num_altsetting; tmp++) { 89 unsigned ep; 90 91 in = out = status = NULL; 92 alt = intf->altsetting + tmp; 93 94 /* take the first altsetting with in-bulk + out-bulk; 95 * remember any status endpoint, just in case; 96 * ignore other endpoints and altsettings. 97 */ 98 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) { 99 struct usb_host_endpoint *e; 100 int intr = 0; 101 102 e = alt->endpoint + ep; 103 104 /* ignore endpoints which cannot transfer data */ 105 if (!usb_endpoint_maxp(&e->desc)) 106 continue; 107 108 switch (e->desc.bmAttributes) { 109 case USB_ENDPOINT_XFER_INT: 110 if (!usb_endpoint_dir_in(&e->desc)) 111 continue; 112 intr = 1; 113 /* FALLTHROUGH */ 114 case USB_ENDPOINT_XFER_BULK: 115 break; 116 default: 117 continue; 118 } 119 if (usb_endpoint_dir_in(&e->desc)) { 120 if (!intr && !in) 121 in = e; 122 else if (intr && !status) 123 status = e; 124 } else { 125 if (!out) 126 out = e; 127 } 128 } 129 if (in && out) 130 break; 131 } 132 if (!alt || !in || !out) 133 return -EINVAL; 134 135 if (alt->desc.bAlternateSetting != 0 || 136 !(dev->driver_info->flags & FLAG_NO_SETINT)) { 137 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber, 138 alt->desc.bAlternateSetting); 139 if (tmp < 0) 140 return tmp; 141 } 142 143 dev->in = usb_rcvbulkpipe (dev->udev, 144 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 145 dev->out = usb_sndbulkpipe (dev->udev, 146 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 147 dev->status = status; 148 return 0; 149 } 150 EXPORT_SYMBOL_GPL(usbnet_get_endpoints); 151 152 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress) 153 { 154 int tmp = -1, ret; 155 unsigned char buf [13]; 156 157 ret = usb_string(dev->udev, iMACAddress, buf, sizeof buf); 158 if (ret == 12) 159 tmp = hex2bin(dev->net->dev_addr, buf, 6); 160 if (tmp < 0) { 161 dev_dbg(&dev->udev->dev, 162 "bad MAC string %d fetch, %d\n", iMACAddress, tmp); 163 if (ret >= 0) 164 ret = -EINVAL; 165 return ret; 166 } 167 return 0; 168 } 169 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr); 170 171 static void intr_complete (struct urb *urb) 172 { 173 struct usbnet *dev = urb->context; 174 int status = urb->status; 175 176 switch (status) { 177 /* success */ 178 case 0: 179 dev->driver_info->status(dev, urb); 180 break; 181 182 /* software-driven interface shutdown */ 183 case -ENOENT: /* urb killed */ 184 case -ESHUTDOWN: /* hardware gone */ 185 netif_dbg(dev, ifdown, dev->net, 186 "intr shutdown, code %d\n", status); 187 return; 188 189 /* NOTE: not throttling like RX/TX, since this endpoint 190 * already polls infrequently 191 */ 192 default: 193 netdev_dbg(dev->net, "intr status %d\n", status); 194 break; 195 } 196 197 status = usb_submit_urb (urb, GFP_ATOMIC); 198 if (status != 0) 199 netif_err(dev, timer, dev->net, 200 "intr resubmit --> %d\n", status); 201 } 202 203 static int init_status (struct usbnet *dev, struct usb_interface *intf) 204 { 205 char *buf = NULL; 206 unsigned pipe = 0; 207 unsigned maxp; 208 unsigned period; 209 210 if (!dev->driver_info->status) 211 return 0; 212 213 pipe = usb_rcvintpipe (dev->udev, 214 dev->status->desc.bEndpointAddress 215 & USB_ENDPOINT_NUMBER_MASK); 216 maxp = usb_maxpacket (dev->udev, pipe, 0); 217 218 /* avoid 1 msec chatter: min 8 msec poll rate */ 219 period = max ((int) dev->status->desc.bInterval, 220 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3); 221 222 buf = kmalloc (maxp, GFP_KERNEL); 223 if (buf) { 224 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL); 225 if (!dev->interrupt) { 226 kfree (buf); 227 return -ENOMEM; 228 } else { 229 usb_fill_int_urb(dev->interrupt, dev->udev, pipe, 230 buf, maxp, intr_complete, dev, period); 231 dev->interrupt->transfer_flags |= URB_FREE_BUFFER; 232 dev_dbg(&intf->dev, 233 "status ep%din, %d bytes period %d\n", 234 usb_pipeendpoint(pipe), maxp, period); 235 } 236 } 237 return 0; 238 } 239 240 /* Submit the interrupt URB if not previously submitted, increasing refcount */ 241 int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags) 242 { 243 int ret = 0; 244 245 WARN_ON_ONCE(dev->interrupt == NULL); 246 if (dev->interrupt) { 247 mutex_lock(&dev->interrupt_mutex); 248 249 if (++dev->interrupt_count == 1) 250 ret = usb_submit_urb(dev->interrupt, mem_flags); 251 252 dev_dbg(&dev->udev->dev, "incremented interrupt URB count to %d\n", 253 dev->interrupt_count); 254 mutex_unlock(&dev->interrupt_mutex); 255 } 256 return ret; 257 } 258 EXPORT_SYMBOL_GPL(usbnet_status_start); 259 260 /* For resume; submit interrupt URB if previously submitted */ 261 static int __usbnet_status_start_force(struct usbnet *dev, gfp_t mem_flags) 262 { 263 int ret = 0; 264 265 mutex_lock(&dev->interrupt_mutex); 266 if (dev->interrupt_count) { 267 ret = usb_submit_urb(dev->interrupt, mem_flags); 268 dev_dbg(&dev->udev->dev, 269 "submitted interrupt URB for resume\n"); 270 } 271 mutex_unlock(&dev->interrupt_mutex); 272 return ret; 273 } 274 275 /* Kill the interrupt URB if all submitters want it killed */ 276 void usbnet_status_stop(struct usbnet *dev) 277 { 278 if (dev->interrupt) { 279 mutex_lock(&dev->interrupt_mutex); 280 WARN_ON(dev->interrupt_count == 0); 281 282 if (dev->interrupt_count && --dev->interrupt_count == 0) 283 usb_kill_urb(dev->interrupt); 284 285 dev_dbg(&dev->udev->dev, 286 "decremented interrupt URB count to %d\n", 287 dev->interrupt_count); 288 mutex_unlock(&dev->interrupt_mutex); 289 } 290 } 291 EXPORT_SYMBOL_GPL(usbnet_status_stop); 292 293 /* For suspend; always kill interrupt URB */ 294 static void __usbnet_status_stop_force(struct usbnet *dev) 295 { 296 if (dev->interrupt) { 297 mutex_lock(&dev->interrupt_mutex); 298 usb_kill_urb(dev->interrupt); 299 dev_dbg(&dev->udev->dev, "killed interrupt URB for suspend\n"); 300 mutex_unlock(&dev->interrupt_mutex); 301 } 302 } 303 304 /* Passes this packet up the stack, updating its accounting. 305 * Some link protocols batch packets, so their rx_fixup paths 306 * can return clones as well as just modify the original skb. 307 */ 308 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb) 309 { 310 struct pcpu_sw_netstats *stats64 = this_cpu_ptr(dev->stats64); 311 unsigned long flags; 312 int status; 313 314 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) { 315 skb_queue_tail(&dev->rxq_pause, skb); 316 return; 317 } 318 319 /* only update if unset to allow minidriver rx_fixup override */ 320 if (skb->protocol == 0) 321 skb->protocol = eth_type_trans (skb, dev->net); 322 323 flags = u64_stats_update_begin_irqsave(&stats64->syncp); 324 stats64->rx_packets++; 325 stats64->rx_bytes += skb->len; 326 u64_stats_update_end_irqrestore(&stats64->syncp, flags); 327 328 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n", 329 skb->len + sizeof (struct ethhdr), skb->protocol); 330 memset (skb->cb, 0, sizeof (struct skb_data)); 331 332 if (skb_defer_rx_timestamp(skb)) 333 return; 334 335 status = netif_rx (skb); 336 if (status != NET_RX_SUCCESS) 337 netif_dbg(dev, rx_err, dev->net, 338 "netif_rx status %d\n", status); 339 } 340 EXPORT_SYMBOL_GPL(usbnet_skb_return); 341 342 /* must be called if hard_mtu or rx_urb_size changed */ 343 void usbnet_update_max_qlen(struct usbnet *dev) 344 { 345 enum usb_device_speed speed = dev->udev->speed; 346 347 if (!dev->rx_urb_size || !dev->hard_mtu) 348 goto insanity; 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 case USB_SPEED_SUPER_PLUS: 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 insanity: 366 dev->rx_qlen = dev->tx_qlen = 4; 367 } 368 } 369 EXPORT_SYMBOL_GPL(usbnet_update_max_qlen); 370 371 372 /*------------------------------------------------------------------------- 373 * 374 * Network Device Driver (peer link to "Host Device", from USB host) 375 * 376 *-------------------------------------------------------------------------*/ 377 378 int usbnet_change_mtu (struct net_device *net, int new_mtu) 379 { 380 struct usbnet *dev = netdev_priv(net); 381 int ll_mtu = new_mtu + net->hard_header_len; 382 int old_hard_mtu = dev->hard_mtu; 383 int old_rx_urb_size = dev->rx_urb_size; 384 385 // 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_pause_rx(dev); 395 usbnet_unlink_rx_urbs(dev); 396 usbnet_resume_rx(dev); 397 } 398 } 399 400 /* max qlen depend on hard_mtu and rx_urb_size */ 401 usbnet_update_max_qlen(dev); 402 403 return 0; 404 } 405 EXPORT_SYMBOL_GPL(usbnet_change_mtu); 406 407 /* The caller must hold list->lock */ 408 static void __usbnet_queue_skb(struct sk_buff_head *list, 409 struct sk_buff *newsk, enum skb_state state) 410 { 411 struct skb_data *entry = (struct skb_data *) newsk->cb; 412 413 __skb_queue_tail(list, newsk); 414 entry->state = state; 415 } 416 417 /*-------------------------------------------------------------------------*/ 418 419 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from 420 * completion callbacks. 2.5 should have fixed those bugs... 421 */ 422 423 static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb, 424 struct sk_buff_head *list, enum skb_state state) 425 { 426 unsigned long flags; 427 enum skb_state old_state; 428 struct skb_data *entry = (struct skb_data *) skb->cb; 429 430 spin_lock_irqsave(&list->lock, flags); 431 old_state = entry->state; 432 entry->state = state; 433 __skb_unlink(skb, list); 434 435 /* defer_bh() is never called with list == &dev->done. 436 * spin_lock_nested() tells lockdep that it is OK to take 437 * dev->done.lock here with list->lock held. 438 */ 439 spin_lock_nested(&dev->done.lock, SINGLE_DEPTH_NESTING); 440 441 __skb_queue_tail(&dev->done, skb); 442 if (dev->done.qlen == 1) 443 tasklet_schedule(&dev->bh); 444 spin_unlock(&dev->done.lock); 445 spin_unlock_irqrestore(&list->lock, flags); 446 return old_state; 447 } 448 449 /* some work can't be done in tasklets, so we use keventd 450 * 451 * NOTE: annoying asymmetry: if it's active, schedule_work() fails, 452 * but tasklet_schedule() doesn't. hope the failure is rare. 453 */ 454 void usbnet_defer_kevent (struct usbnet *dev, int work) 455 { 456 set_bit (work, &dev->flags); 457 if (!schedule_work (&dev->kevent)) 458 netdev_dbg(dev->net, "kevent %d may have been dropped\n", work); 459 else 460 netdev_dbg(dev->net, "kevent %d scheduled\n", work); 461 } 462 EXPORT_SYMBOL_GPL(usbnet_defer_kevent); 463 464 /*-------------------------------------------------------------------------*/ 465 466 static void rx_complete (struct urb *urb); 467 468 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) 469 { 470 struct sk_buff *skb; 471 struct skb_data *entry; 472 int retval = 0; 473 unsigned long lockflags; 474 size_t size = dev->rx_urb_size; 475 476 /* prevent rx skb allocation when error ratio is high */ 477 if (test_bit(EVENT_RX_KILL, &dev->flags)) { 478 usb_free_urb(urb); 479 return -ENOLINK; 480 } 481 482 if (test_bit(EVENT_NO_IP_ALIGN, &dev->flags)) 483 skb = __netdev_alloc_skb(dev->net, size, flags); 484 else 485 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags); 486 if (!skb) { 487 netif_dbg(dev, rx_err, dev->net, "no rx skb\n"); 488 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 489 usb_free_urb (urb); 490 return -ENOMEM; 491 } 492 493 entry = (struct skb_data *) skb->cb; 494 entry->urb = urb; 495 entry->dev = dev; 496 entry->length = 0; 497 498 usb_fill_bulk_urb (urb, dev->udev, dev->in, 499 skb->data, size, rx_complete, skb); 500 501 spin_lock_irqsave (&dev->rxq.lock, lockflags); 502 503 if (netif_running (dev->net) && 504 netif_device_present (dev->net) && 505 test_bit(EVENT_DEV_OPEN, &dev->flags) && 506 !test_bit (EVENT_RX_HALT, &dev->flags) && 507 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) { 508 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) { 509 case -EPIPE: 510 usbnet_defer_kevent (dev, EVENT_RX_HALT); 511 break; 512 case -ENOMEM: 513 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 514 break; 515 case -ENODEV: 516 netif_dbg(dev, ifdown, dev->net, "device gone\n"); 517 netif_device_detach (dev->net); 518 break; 519 case -EHOSTUNREACH: 520 retval = -ENOLINK; 521 break; 522 default: 523 netif_dbg(dev, rx_err, dev->net, 524 "rx submit, %d\n", retval); 525 tasklet_schedule (&dev->bh); 526 break; 527 case 0: 528 __usbnet_queue_skb(&dev->rxq, skb, rx_start); 529 } 530 } else { 531 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n"); 532 retval = -ENOLINK; 533 } 534 spin_unlock_irqrestore (&dev->rxq.lock, lockflags); 535 if (retval) { 536 dev_kfree_skb_any (skb); 537 usb_free_urb (urb); 538 } 539 return retval; 540 } 541 542 543 /*-------------------------------------------------------------------------*/ 544 545 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb) 546 { 547 if (dev->driver_info->rx_fixup && 548 !dev->driver_info->rx_fixup (dev, skb)) { 549 /* With RX_ASSEMBLE, rx_fixup() must update counters */ 550 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE)) 551 dev->net->stats.rx_errors++; 552 goto done; 553 } 554 // else network stack removes extra byte if we forced a short packet 555 556 /* all data was already cloned from skb inside the driver */ 557 if (dev->driver_info->flags & FLAG_MULTI_PACKET) 558 goto done; 559 560 if (skb->len < ETH_HLEN) { 561 dev->net->stats.rx_errors++; 562 dev->net->stats.rx_length_errors++; 563 netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len); 564 } else { 565 usbnet_skb_return(dev, skb); 566 return; 567 } 568 569 done: 570 skb_queue_tail(&dev->done, skb); 571 } 572 573 /*-------------------------------------------------------------------------*/ 574 575 static void rx_complete (struct urb *urb) 576 { 577 struct sk_buff *skb = (struct sk_buff *) urb->context; 578 struct skb_data *entry = (struct skb_data *) skb->cb; 579 struct usbnet *dev = entry->dev; 580 int urb_status = urb->status; 581 enum skb_state state; 582 583 skb_put (skb, urb->actual_length); 584 state = rx_done; 585 entry->urb = NULL; 586 587 switch (urb_status) { 588 /* success */ 589 case 0: 590 break; 591 592 /* stalls need manual reset. this is rare ... except that 593 * when going through USB 2.0 TTs, unplug appears this way. 594 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ 595 * storm, recovering as needed. 596 */ 597 case -EPIPE: 598 dev->net->stats.rx_errors++; 599 usbnet_defer_kevent (dev, EVENT_RX_HALT); 600 // FALLTHROUGH 601 602 /* software-driven interface shutdown */ 603 case -ECONNRESET: /* async unlink */ 604 case -ESHUTDOWN: /* hardware gone */ 605 netif_dbg(dev, ifdown, dev->net, 606 "rx shutdown, code %d\n", urb_status); 607 goto block; 608 609 /* we get controller i/o faults during hub_wq disconnect() delays. 610 * throttle down resubmits, to avoid log floods; just temporarily, 611 * so we still recover when the fault isn't a hub_wq delay. 612 */ 613 case -EPROTO: 614 case -ETIME: 615 case -EILSEQ: 616 dev->net->stats.rx_errors++; 617 if (!timer_pending (&dev->delay)) { 618 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); 619 netif_dbg(dev, link, dev->net, 620 "rx throttle %d\n", urb_status); 621 } 622 block: 623 state = rx_cleanup; 624 entry->urb = urb; 625 urb = NULL; 626 break; 627 628 /* data overrun ... flush fifo? */ 629 case -EOVERFLOW: 630 dev->net->stats.rx_over_errors++; 631 // FALLTHROUGH 632 633 default: 634 state = rx_cleanup; 635 dev->net->stats.rx_errors++; 636 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status); 637 break; 638 } 639 640 /* stop rx if packet error rate is high */ 641 if (++dev->pkt_cnt > 30) { 642 dev->pkt_cnt = 0; 643 dev->pkt_err = 0; 644 } else { 645 if (state == rx_cleanup) 646 dev->pkt_err++; 647 if (dev->pkt_err > 20) 648 set_bit(EVENT_RX_KILL, &dev->flags); 649 } 650 651 state = defer_bh(dev, skb, &dev->rxq, state); 652 653 if (urb) { 654 if (netif_running (dev->net) && 655 !test_bit (EVENT_RX_HALT, &dev->flags) && 656 state != unlink_start) { 657 rx_submit (dev, urb, GFP_ATOMIC); 658 usb_mark_last_busy(dev->udev); 659 return; 660 } 661 usb_free_urb (urb); 662 } 663 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n"); 664 } 665 666 /*-------------------------------------------------------------------------*/ 667 void usbnet_pause_rx(struct usbnet *dev) 668 { 669 set_bit(EVENT_RX_PAUSED, &dev->flags); 670 671 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n"); 672 } 673 EXPORT_SYMBOL_GPL(usbnet_pause_rx); 674 675 void usbnet_resume_rx(struct usbnet *dev) 676 { 677 struct sk_buff *skb; 678 int num = 0; 679 680 clear_bit(EVENT_RX_PAUSED, &dev->flags); 681 682 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) { 683 usbnet_skb_return(dev, skb); 684 num++; 685 } 686 687 tasklet_schedule(&dev->bh); 688 689 netif_dbg(dev, rx_status, dev->net, 690 "paused rx queue disabled, %d skbs requeued\n", num); 691 } 692 EXPORT_SYMBOL_GPL(usbnet_resume_rx); 693 694 void usbnet_purge_paused_rxq(struct usbnet *dev) 695 { 696 skb_queue_purge(&dev->rxq_pause); 697 } 698 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq); 699 700 /*-------------------------------------------------------------------------*/ 701 702 // unlink pending rx/tx; completion handlers do all other cleanup 703 704 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) 705 { 706 unsigned long flags; 707 struct sk_buff *skb; 708 int count = 0; 709 710 spin_lock_irqsave (&q->lock, flags); 711 while (!skb_queue_empty(q)) { 712 struct skb_data *entry; 713 struct urb *urb; 714 int retval; 715 716 skb_queue_walk(q, skb) { 717 entry = (struct skb_data *) skb->cb; 718 if (entry->state != unlink_start) 719 goto found; 720 } 721 break; 722 found: 723 entry->state = unlink_start; 724 urb = entry->urb; 725 726 /* 727 * Get reference count of the URB to avoid it to be 728 * freed during usb_unlink_urb, which may trigger 729 * use-after-free problem inside usb_unlink_urb since 730 * usb_unlink_urb is always racing with .complete 731 * handler(include defer_bh). 732 */ 733 usb_get_urb(urb); 734 spin_unlock_irqrestore(&q->lock, flags); 735 // during some PM-driven resume scenarios, 736 // these (async) unlinks complete immediately 737 retval = usb_unlink_urb (urb); 738 if (retval != -EINPROGRESS && retval != 0) 739 netdev_dbg(dev->net, "unlink urb err, %d\n", retval); 740 else 741 count++; 742 usb_put_urb(urb); 743 spin_lock_irqsave(&q->lock, flags); 744 } 745 spin_unlock_irqrestore (&q->lock, flags); 746 return count; 747 } 748 749 // Flush all pending rx urbs 750 // minidrivers may need to do this when the MTU changes 751 752 void usbnet_unlink_rx_urbs(struct usbnet *dev) 753 { 754 if (netif_running(dev->net)) { 755 (void) unlink_urbs (dev, &dev->rxq); 756 tasklet_schedule(&dev->bh); 757 } 758 } 759 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); 760 761 /*-------------------------------------------------------------------------*/ 762 763 static void wait_skb_queue_empty(struct sk_buff_head *q) 764 { 765 unsigned long flags; 766 767 spin_lock_irqsave(&q->lock, flags); 768 while (!skb_queue_empty(q)) { 769 spin_unlock_irqrestore(&q->lock, flags); 770 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS)); 771 set_current_state(TASK_UNINTERRUPTIBLE); 772 spin_lock_irqsave(&q->lock, flags); 773 } 774 spin_unlock_irqrestore(&q->lock, flags); 775 } 776 777 // precondition: never called in_interrupt 778 static void usbnet_terminate_urbs(struct usbnet *dev) 779 { 780 DECLARE_WAITQUEUE(wait, current); 781 int temp; 782 783 /* ensure there are no more active urbs */ 784 add_wait_queue(&dev->wait, &wait); 785 set_current_state(TASK_UNINTERRUPTIBLE); 786 temp = unlink_urbs(dev, &dev->txq) + 787 unlink_urbs(dev, &dev->rxq); 788 789 /* maybe wait for deletions to finish. */ 790 wait_skb_queue_empty(&dev->rxq); 791 wait_skb_queue_empty(&dev->txq); 792 wait_skb_queue_empty(&dev->done); 793 netif_dbg(dev, ifdown, dev->net, 794 "waited for %d urb completions\n", temp); 795 set_current_state(TASK_RUNNING); 796 remove_wait_queue(&dev->wait, &wait); 797 } 798 799 int usbnet_stop (struct net_device *net) 800 { 801 struct usbnet *dev = netdev_priv(net); 802 const struct driver_info *info = dev->driver_info; 803 int retval, pm, mpn; 804 805 clear_bit(EVENT_DEV_OPEN, &dev->flags); 806 netif_stop_queue (net); 807 808 netif_info(dev, ifdown, dev->net, 809 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n", 810 net->stats.rx_packets, net->stats.tx_packets, 811 net->stats.rx_errors, net->stats.tx_errors); 812 813 /* to not race resume */ 814 pm = usb_autopm_get_interface(dev->intf); 815 /* allow minidriver to stop correctly (wireless devices to turn off 816 * radio etc) */ 817 if (info->stop) { 818 retval = info->stop(dev); 819 if (retval < 0) 820 netif_info(dev, ifdown, dev->net, 821 "stop fail (%d) usbnet usb-%s-%s, %s\n", 822 retval, 823 dev->udev->bus->bus_name, dev->udev->devpath, 824 info->description); 825 } 826 827 if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) 828 usbnet_terminate_urbs(dev); 829 830 usbnet_status_stop(dev); 831 832 usbnet_purge_paused_rxq(dev); 833 834 mpn = !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags); 835 836 /* deferred work (task, timer, softirq) must also stop. 837 * can't flush_scheduled_work() until we drop rtnl (later), 838 * else workers could deadlock; so make workers a NOP. 839 */ 840 dev->flags = 0; 841 del_timer_sync (&dev->delay); 842 tasklet_kill (&dev->bh); 843 if (!pm) 844 usb_autopm_put_interface(dev->intf); 845 846 if (info->manage_power && mpn) 847 info->manage_power(dev, 0); 848 else 849 usb_autopm_put_interface(dev->intf); 850 851 return 0; 852 } 853 EXPORT_SYMBOL_GPL(usbnet_stop); 854 855 /*-------------------------------------------------------------------------*/ 856 857 // posts reads, and enables write queuing 858 859 // precondition: never called in_interrupt 860 861 int usbnet_open (struct net_device *net) 862 { 863 struct usbnet *dev = netdev_priv(net); 864 int retval; 865 const struct driver_info *info = dev->driver_info; 866 867 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { 868 netif_info(dev, ifup, dev->net, 869 "resumption fail (%d) usbnet usb-%s-%s, %s\n", 870 retval, 871 dev->udev->bus->bus_name, 872 dev->udev->devpath, 873 info->description); 874 goto done_nopm; 875 } 876 877 // put into "known safe" state 878 if (info->reset && (retval = info->reset (dev)) < 0) { 879 netif_info(dev, ifup, dev->net, 880 "open reset fail (%d) usbnet usb-%s-%s, %s\n", 881 retval, 882 dev->udev->bus->bus_name, 883 dev->udev->devpath, 884 info->description); 885 goto done; 886 } 887 888 /* hard_mtu or rx_urb_size may change in reset() */ 889 usbnet_update_max_qlen(dev); 890 891 // insist peer be connected 892 if (info->check_connect && (retval = info->check_connect (dev)) < 0) { 893 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval); 894 goto done; 895 } 896 897 /* start any status interrupt transfer */ 898 if (dev->interrupt) { 899 retval = usbnet_status_start(dev, GFP_KERNEL); 900 if (retval < 0) { 901 netif_err(dev, ifup, dev->net, 902 "intr submit %d\n", retval); 903 goto done; 904 } 905 } 906 907 set_bit(EVENT_DEV_OPEN, &dev->flags); 908 netif_start_queue (net); 909 netif_info(dev, ifup, dev->net, 910 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n", 911 (int)RX_QLEN(dev), (int)TX_QLEN(dev), 912 dev->net->mtu, 913 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" : 914 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" : 915 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" : 916 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" : 917 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" : 918 "simple"); 919 920 /* reset rx error state */ 921 dev->pkt_cnt = 0; 922 dev->pkt_err = 0; 923 clear_bit(EVENT_RX_KILL, &dev->flags); 924 925 // delay posting reads until we're fully open 926 tasklet_schedule (&dev->bh); 927 if (info->manage_power) { 928 retval = info->manage_power(dev, 1); 929 if (retval < 0) { 930 retval = 0; 931 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags); 932 } else { 933 usb_autopm_put_interface(dev->intf); 934 } 935 } 936 return retval; 937 done: 938 usb_autopm_put_interface(dev->intf); 939 done_nopm: 940 return retval; 941 } 942 EXPORT_SYMBOL_GPL(usbnet_open); 943 944 /*-------------------------------------------------------------------------*/ 945 946 /* ethtool methods; minidrivers may need to add some more, but 947 * they'll probably want to use this base set. 948 */ 949 950 int usbnet_get_link_ksettings(struct net_device *net, 951 struct ethtool_link_ksettings *cmd) 952 { 953 struct usbnet *dev = netdev_priv(net); 954 955 if (!dev->mii.mdio_read) 956 return -EOPNOTSUPP; 957 958 mii_ethtool_get_link_ksettings(&dev->mii, cmd); 959 960 return 0; 961 } 962 EXPORT_SYMBOL_GPL(usbnet_get_link_ksettings); 963 964 int usbnet_set_link_ksettings(struct net_device *net, 965 const struct ethtool_link_ksettings *cmd) 966 { 967 struct usbnet *dev = netdev_priv(net); 968 int retval; 969 970 if (!dev->mii.mdio_write) 971 return -EOPNOTSUPP; 972 973 retval = mii_ethtool_set_link_ksettings(&dev->mii, cmd); 974 975 /* link speed/duplex might have changed */ 976 if (dev->driver_info->link_reset) 977 dev->driver_info->link_reset(dev); 978 979 /* hard_mtu or rx_urb_size may change in link_reset() */ 980 usbnet_update_max_qlen(dev); 981 982 return retval; 983 } 984 EXPORT_SYMBOL_GPL(usbnet_set_link_ksettings); 985 986 void usbnet_get_stats64(struct net_device *net, struct rtnl_link_stats64 *stats) 987 { 988 struct usbnet *dev = netdev_priv(net); 989 unsigned int start; 990 int cpu; 991 992 netdev_stats_to_stats64(stats, &net->stats); 993 994 for_each_possible_cpu(cpu) { 995 struct pcpu_sw_netstats *stats64; 996 u64 rx_packets, rx_bytes; 997 u64 tx_packets, tx_bytes; 998 999 stats64 = per_cpu_ptr(dev->stats64, cpu); 1000 1001 do { 1002 start = u64_stats_fetch_begin_irq(&stats64->syncp); 1003 rx_packets = stats64->rx_packets; 1004 rx_bytes = stats64->rx_bytes; 1005 tx_packets = stats64->tx_packets; 1006 tx_bytes = stats64->tx_bytes; 1007 } while (u64_stats_fetch_retry_irq(&stats64->syncp, start)); 1008 1009 stats->rx_packets += rx_packets; 1010 stats->rx_bytes += rx_bytes; 1011 stats->tx_packets += tx_packets; 1012 stats->tx_bytes += tx_bytes; 1013 } 1014 } 1015 EXPORT_SYMBOL_GPL(usbnet_get_stats64); 1016 1017 u32 usbnet_get_link (struct net_device *net) 1018 { 1019 struct usbnet *dev = netdev_priv(net); 1020 1021 /* If a check_connect is defined, return its result */ 1022 if (dev->driver_info->check_connect) 1023 return dev->driver_info->check_connect (dev) == 0; 1024 1025 /* if the device has mii operations, use those */ 1026 if (dev->mii.mdio_read) 1027 return mii_link_ok(&dev->mii); 1028 1029 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ 1030 return ethtool_op_get_link(net); 1031 } 1032 EXPORT_SYMBOL_GPL(usbnet_get_link); 1033 1034 int usbnet_nway_reset(struct net_device *net) 1035 { 1036 struct usbnet *dev = netdev_priv(net); 1037 1038 if (!dev->mii.mdio_write) 1039 return -EOPNOTSUPP; 1040 1041 return mii_nway_restart(&dev->mii); 1042 } 1043 EXPORT_SYMBOL_GPL(usbnet_nway_reset); 1044 1045 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) 1046 { 1047 struct usbnet *dev = netdev_priv(net); 1048 1049 strlcpy (info->driver, dev->driver_name, sizeof info->driver); 1050 strlcpy (info->version, DRIVER_VERSION, sizeof info->version); 1051 strlcpy (info->fw_version, dev->driver_info->description, 1052 sizeof info->fw_version); 1053 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); 1054 } 1055 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); 1056 1057 u32 usbnet_get_msglevel (struct net_device *net) 1058 { 1059 struct usbnet *dev = netdev_priv(net); 1060 1061 return dev->msg_enable; 1062 } 1063 EXPORT_SYMBOL_GPL(usbnet_get_msglevel); 1064 1065 void usbnet_set_msglevel (struct net_device *net, u32 level) 1066 { 1067 struct usbnet *dev = netdev_priv(net); 1068 1069 dev->msg_enable = level; 1070 } 1071 EXPORT_SYMBOL_GPL(usbnet_set_msglevel); 1072 1073 /* drivers may override default ethtool_ops in their bind() routine */ 1074 static const struct ethtool_ops usbnet_ethtool_ops = { 1075 .get_link = usbnet_get_link, 1076 .nway_reset = usbnet_nway_reset, 1077 .get_drvinfo = usbnet_get_drvinfo, 1078 .get_msglevel = usbnet_get_msglevel, 1079 .set_msglevel = usbnet_set_msglevel, 1080 .get_ts_info = ethtool_op_get_ts_info, 1081 .get_link_ksettings = usbnet_get_link_ksettings, 1082 .set_link_ksettings = usbnet_set_link_ksettings, 1083 }; 1084 1085 /*-------------------------------------------------------------------------*/ 1086 1087 static void __handle_link_change(struct usbnet *dev) 1088 { 1089 if (!test_bit(EVENT_DEV_OPEN, &dev->flags)) 1090 return; 1091 1092 if (!netif_carrier_ok(dev->net)) { 1093 /* kill URBs for reading packets to save bus bandwidth */ 1094 unlink_urbs(dev, &dev->rxq); 1095 1096 /* 1097 * tx_timeout will unlink URBs for sending packets and 1098 * tx queue is stopped by netcore after link becomes off 1099 */ 1100 } else { 1101 /* submitting URBs for reading packets */ 1102 tasklet_schedule(&dev->bh); 1103 } 1104 1105 /* hard_mtu or rx_urb_size may change during link change */ 1106 usbnet_update_max_qlen(dev); 1107 1108 clear_bit(EVENT_LINK_CHANGE, &dev->flags); 1109 } 1110 1111 void usbnet_set_rx_mode(struct net_device *net) 1112 { 1113 struct usbnet *dev = netdev_priv(net); 1114 1115 usbnet_defer_kevent(dev, EVENT_SET_RX_MODE); 1116 } 1117 EXPORT_SYMBOL_GPL(usbnet_set_rx_mode); 1118 1119 static void __handle_set_rx_mode(struct usbnet *dev) 1120 { 1121 if (dev->driver_info->set_rx_mode) 1122 (dev->driver_info->set_rx_mode)(dev); 1123 1124 clear_bit(EVENT_SET_RX_MODE, &dev->flags); 1125 } 1126 1127 /* work that cannot be done in interrupt context uses keventd. 1128 * 1129 * NOTE: with 2.5 we could do more of this using completion callbacks, 1130 * especially now that control transfers can be queued. 1131 */ 1132 static void 1133 usbnet_deferred_kevent (struct work_struct *work) 1134 { 1135 struct usbnet *dev = 1136 container_of(work, struct usbnet, kevent); 1137 int status; 1138 1139 /* usb_clear_halt() needs a thread context */ 1140 if (test_bit (EVENT_TX_HALT, &dev->flags)) { 1141 unlink_urbs (dev, &dev->txq); 1142 status = usb_autopm_get_interface(dev->intf); 1143 if (status < 0) 1144 goto fail_pipe; 1145 status = usb_clear_halt (dev->udev, dev->out); 1146 usb_autopm_put_interface(dev->intf); 1147 if (status < 0 && 1148 status != -EPIPE && 1149 status != -ESHUTDOWN) { 1150 if (netif_msg_tx_err (dev)) 1151 fail_pipe: 1152 netdev_err(dev->net, "can't clear tx halt, status %d\n", 1153 status); 1154 } else { 1155 clear_bit (EVENT_TX_HALT, &dev->flags); 1156 if (status != -ESHUTDOWN) 1157 netif_wake_queue (dev->net); 1158 } 1159 } 1160 if (test_bit (EVENT_RX_HALT, &dev->flags)) { 1161 unlink_urbs (dev, &dev->rxq); 1162 status = usb_autopm_get_interface(dev->intf); 1163 if (status < 0) 1164 goto fail_halt; 1165 status = usb_clear_halt (dev->udev, dev->in); 1166 usb_autopm_put_interface(dev->intf); 1167 if (status < 0 && 1168 status != -EPIPE && 1169 status != -ESHUTDOWN) { 1170 if (netif_msg_rx_err (dev)) 1171 fail_halt: 1172 netdev_err(dev->net, "can't clear rx halt, status %d\n", 1173 status); 1174 } else { 1175 clear_bit (EVENT_RX_HALT, &dev->flags); 1176 tasklet_schedule (&dev->bh); 1177 } 1178 } 1179 1180 /* tasklet could resubmit itself forever if memory is tight */ 1181 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { 1182 struct urb *urb = NULL; 1183 int resched = 1; 1184 1185 if (netif_running (dev->net)) 1186 urb = usb_alloc_urb (0, GFP_KERNEL); 1187 else 1188 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1189 if (urb != NULL) { 1190 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1191 status = usb_autopm_get_interface(dev->intf); 1192 if (status < 0) { 1193 usb_free_urb(urb); 1194 goto fail_lowmem; 1195 } 1196 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) 1197 resched = 0; 1198 usb_autopm_put_interface(dev->intf); 1199 fail_lowmem: 1200 if (resched) 1201 tasklet_schedule (&dev->bh); 1202 } 1203 } 1204 1205 if (test_bit (EVENT_LINK_RESET, &dev->flags)) { 1206 const struct driver_info *info = dev->driver_info; 1207 int retval = 0; 1208 1209 clear_bit (EVENT_LINK_RESET, &dev->flags); 1210 status = usb_autopm_get_interface(dev->intf); 1211 if (status < 0) 1212 goto skip_reset; 1213 if(info->link_reset && (retval = info->link_reset(dev)) < 0) { 1214 usb_autopm_put_interface(dev->intf); 1215 skip_reset: 1216 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", 1217 retval, 1218 dev->udev->bus->bus_name, 1219 dev->udev->devpath, 1220 info->description); 1221 } else { 1222 usb_autopm_put_interface(dev->intf); 1223 } 1224 1225 /* handle link change from link resetting */ 1226 __handle_link_change(dev); 1227 } 1228 1229 if (test_bit (EVENT_LINK_CHANGE, &dev->flags)) 1230 __handle_link_change(dev); 1231 1232 if (test_bit (EVENT_SET_RX_MODE, &dev->flags)) 1233 __handle_set_rx_mode(dev); 1234 1235 1236 if (dev->flags) 1237 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); 1238 } 1239 1240 /*-------------------------------------------------------------------------*/ 1241 1242 static void tx_complete (struct urb *urb) 1243 { 1244 struct sk_buff *skb = (struct sk_buff *) urb->context; 1245 struct skb_data *entry = (struct skb_data *) skb->cb; 1246 struct usbnet *dev = entry->dev; 1247 1248 if (urb->status == 0) { 1249 struct pcpu_sw_netstats *stats64 = this_cpu_ptr(dev->stats64); 1250 unsigned long flags; 1251 1252 flags = u64_stats_update_begin_irqsave(&stats64->syncp); 1253 stats64->tx_packets += entry->packets; 1254 stats64->tx_bytes += entry->length; 1255 u64_stats_update_end_irqrestore(&stats64->syncp, flags); 1256 } else { 1257 dev->net->stats.tx_errors++; 1258 1259 switch (urb->status) { 1260 case -EPIPE: 1261 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1262 break; 1263 1264 /* software-driven interface shutdown */ 1265 case -ECONNRESET: // async unlink 1266 case -ESHUTDOWN: // hardware gone 1267 break; 1268 1269 /* like rx, tx gets controller i/o faults during hub_wq 1270 * delays and so it uses the same throttling mechanism. 1271 */ 1272 case -EPROTO: 1273 case -ETIME: 1274 case -EILSEQ: 1275 usb_mark_last_busy(dev->udev); 1276 if (!timer_pending (&dev->delay)) { 1277 mod_timer (&dev->delay, 1278 jiffies + THROTTLE_JIFFIES); 1279 netif_dbg(dev, link, dev->net, 1280 "tx throttle %d\n", urb->status); 1281 } 1282 netif_stop_queue (dev->net); 1283 break; 1284 default: 1285 netif_dbg(dev, tx_err, dev->net, 1286 "tx err %d\n", entry->urb->status); 1287 break; 1288 } 1289 } 1290 1291 usb_autopm_put_interface_async(dev->intf); 1292 (void) defer_bh(dev, skb, &dev->txq, tx_done); 1293 } 1294 1295 /*-------------------------------------------------------------------------*/ 1296 1297 void usbnet_tx_timeout (struct net_device *net, unsigned int txqueue) 1298 { 1299 struct usbnet *dev = netdev_priv(net); 1300 1301 unlink_urbs (dev, &dev->txq); 1302 tasklet_schedule (&dev->bh); 1303 /* this needs to be handled individually because the generic layer 1304 * doesn't know what is sufficient and could not restore private 1305 * information if a remedy of an unconditional reset were used. 1306 */ 1307 if (dev->driver_info->recover) 1308 (dev->driver_info->recover)(dev); 1309 } 1310 EXPORT_SYMBOL_GPL(usbnet_tx_timeout); 1311 1312 /*-------------------------------------------------------------------------*/ 1313 1314 static int build_dma_sg(const struct sk_buff *skb, struct urb *urb) 1315 { 1316 unsigned num_sgs, total_len = 0; 1317 int i, s = 0; 1318 1319 num_sgs = skb_shinfo(skb)->nr_frags + 1; 1320 if (num_sgs == 1) 1321 return 0; 1322 1323 /* reserve one for zero packet */ 1324 urb->sg = kmalloc_array(num_sgs + 1, sizeof(struct scatterlist), 1325 GFP_ATOMIC); 1326 if (!urb->sg) 1327 return -ENOMEM; 1328 1329 urb->num_sgs = num_sgs; 1330 sg_init_table(urb->sg, urb->num_sgs + 1); 1331 1332 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb)); 1333 total_len += skb_headlen(skb); 1334 1335 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1336 skb_frag_t *f = &skb_shinfo(skb)->frags[i]; 1337 1338 total_len += skb_frag_size(f); 1339 sg_set_page(&urb->sg[i + s], skb_frag_page(f), skb_frag_size(f), 1340 skb_frag_off(f)); 1341 } 1342 urb->transfer_buffer_length = total_len; 1343 1344 return 1; 1345 } 1346 1347 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, 1348 struct net_device *net) 1349 { 1350 struct usbnet *dev = netdev_priv(net); 1351 unsigned int length; 1352 struct urb *urb = NULL; 1353 struct skb_data *entry; 1354 const struct driver_info *info = dev->driver_info; 1355 unsigned long flags; 1356 int retval; 1357 1358 if (skb) 1359 skb_tx_timestamp(skb); 1360 1361 // some devices want funky USB-level framing, for 1362 // win32 driver (usually) and/or hardware quirks 1363 if (info->tx_fixup) { 1364 skb = info->tx_fixup (dev, skb, GFP_ATOMIC); 1365 if (!skb) { 1366 /* packet collected; minidriver waiting for more */ 1367 if (info->flags & FLAG_MULTI_PACKET) 1368 goto not_drop; 1369 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); 1370 goto drop; 1371 } 1372 } 1373 1374 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { 1375 netif_dbg(dev, tx_err, dev->net, "no urb\n"); 1376 goto drop; 1377 } 1378 1379 entry = (struct skb_data *) skb->cb; 1380 entry->urb = urb; 1381 entry->dev = dev; 1382 1383 usb_fill_bulk_urb (urb, dev->udev, dev->out, 1384 skb->data, skb->len, tx_complete, skb); 1385 if (dev->can_dma_sg) { 1386 if (build_dma_sg(skb, urb) < 0) 1387 goto drop; 1388 } 1389 length = urb->transfer_buffer_length; 1390 1391 /* don't assume the hardware handles USB_ZERO_PACKET 1392 * NOTE: strictly conforming cdc-ether devices should expect 1393 * the ZLP here, but ignore the one-byte packet. 1394 * NOTE2: CDC NCM specification is different from CDC ECM when 1395 * handling ZLP/short packets, so cdc_ncm driver will make short 1396 * packet itself if needed. 1397 */ 1398 if (length % dev->maxpacket == 0) { 1399 if (!(info->flags & FLAG_SEND_ZLP)) { 1400 if (!(info->flags & FLAG_MULTI_PACKET)) { 1401 length++; 1402 if (skb_tailroom(skb) && !urb->num_sgs) { 1403 skb->data[skb->len] = 0; 1404 __skb_put(skb, 1); 1405 } else if (urb->num_sgs) 1406 sg_set_buf(&urb->sg[urb->num_sgs++], 1407 dev->padding_pkt, 1); 1408 } 1409 } else 1410 urb->transfer_flags |= URB_ZERO_PACKET; 1411 } 1412 urb->transfer_buffer_length = length; 1413 1414 if (info->flags & FLAG_MULTI_PACKET) { 1415 /* Driver has set number of packets and a length delta. 1416 * Calculate the complete length and ensure that it's 1417 * positive. 1418 */ 1419 entry->length += length; 1420 if (WARN_ON_ONCE(entry->length <= 0)) 1421 entry->length = length; 1422 } else { 1423 usbnet_set_skb_tx_stats(skb, 1, length); 1424 } 1425 1426 spin_lock_irqsave(&dev->txq.lock, flags); 1427 retval = usb_autopm_get_interface_async(dev->intf); 1428 if (retval < 0) { 1429 spin_unlock_irqrestore(&dev->txq.lock, flags); 1430 goto drop; 1431 } 1432 if (netif_queue_stopped(net)) { 1433 usb_autopm_put_interface_async(dev->intf); 1434 spin_unlock_irqrestore(&dev->txq.lock, flags); 1435 goto drop; 1436 } 1437 1438 #ifdef CONFIG_PM 1439 /* if this triggers the device is still a sleep */ 1440 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { 1441 /* transmission will be done in resume */ 1442 usb_anchor_urb(urb, &dev->deferred); 1443 /* no use to process more packets */ 1444 netif_stop_queue(net); 1445 usb_put_urb(urb); 1446 spin_unlock_irqrestore(&dev->txq.lock, flags); 1447 netdev_dbg(dev->net, "Delaying transmission for resumption\n"); 1448 goto deferred; 1449 } 1450 #endif 1451 1452 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { 1453 case -EPIPE: 1454 netif_stop_queue (net); 1455 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1456 usb_autopm_put_interface_async(dev->intf); 1457 break; 1458 default: 1459 usb_autopm_put_interface_async(dev->intf); 1460 netif_dbg(dev, tx_err, dev->net, 1461 "tx: submit urb err %d\n", retval); 1462 break; 1463 case 0: 1464 netif_trans_update(net); 1465 __usbnet_queue_skb(&dev->txq, skb, tx_start); 1466 if (dev->txq.qlen >= TX_QLEN (dev)) 1467 netif_stop_queue (net); 1468 } 1469 spin_unlock_irqrestore (&dev->txq.lock, flags); 1470 1471 if (retval) { 1472 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); 1473 drop: 1474 dev->net->stats.tx_dropped++; 1475 not_drop: 1476 if (skb) 1477 dev_kfree_skb_any (skb); 1478 if (urb) { 1479 kfree(urb->sg); 1480 usb_free_urb(urb); 1481 } 1482 } else 1483 netif_dbg(dev, tx_queued, dev->net, 1484 "> tx, len %u, type 0x%x\n", length, skb->protocol); 1485 #ifdef CONFIG_PM 1486 deferred: 1487 #endif 1488 return NETDEV_TX_OK; 1489 } 1490 EXPORT_SYMBOL_GPL(usbnet_start_xmit); 1491 1492 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags) 1493 { 1494 struct urb *urb; 1495 int i; 1496 int ret = 0; 1497 1498 /* don't refill the queue all at once */ 1499 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) { 1500 urb = usb_alloc_urb(0, flags); 1501 if (urb != NULL) { 1502 ret = rx_submit(dev, urb, flags); 1503 if (ret) 1504 goto err; 1505 } else { 1506 ret = -ENOMEM; 1507 goto err; 1508 } 1509 } 1510 err: 1511 return ret; 1512 } 1513 1514 /*-------------------------------------------------------------------------*/ 1515 1516 // tasklet (work deferred from completions, in_irq) or timer 1517 1518 static void usbnet_bh (struct timer_list *t) 1519 { 1520 struct usbnet *dev = from_timer(dev, t, delay); 1521 struct sk_buff *skb; 1522 struct skb_data *entry; 1523 1524 while ((skb = skb_dequeue (&dev->done))) { 1525 entry = (struct skb_data *) skb->cb; 1526 switch (entry->state) { 1527 case rx_done: 1528 entry->state = rx_cleanup; 1529 rx_process (dev, skb); 1530 continue; 1531 case tx_done: 1532 kfree(entry->urb->sg); 1533 /* fall through */ 1534 case rx_cleanup: 1535 usb_free_urb (entry->urb); 1536 dev_kfree_skb (skb); 1537 continue; 1538 default: 1539 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); 1540 } 1541 } 1542 1543 /* restart RX again after disabling due to high error rate */ 1544 clear_bit(EVENT_RX_KILL, &dev->flags); 1545 1546 /* waiting for all pending urbs to complete? 1547 * only then can we forgo submitting anew 1548 */ 1549 if (waitqueue_active(&dev->wait)) { 1550 if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0) 1551 wake_up_all(&dev->wait); 1552 1553 // or are we maybe short a few urbs? 1554 } else if (netif_running (dev->net) && 1555 netif_device_present (dev->net) && 1556 netif_carrier_ok(dev->net) && 1557 !timer_pending(&dev->delay) && 1558 !test_bit(EVENT_RX_PAUSED, &dev->flags) && 1559 !test_bit(EVENT_RX_HALT, &dev->flags)) { 1560 int temp = dev->rxq.qlen; 1561 1562 if (temp < RX_QLEN(dev)) { 1563 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK) 1564 return; 1565 if (temp != dev->rxq.qlen) 1566 netif_dbg(dev, link, dev->net, 1567 "rxqlen %d --> %d\n", 1568 temp, dev->rxq.qlen); 1569 if (dev->rxq.qlen < RX_QLEN(dev)) 1570 tasklet_schedule (&dev->bh); 1571 } 1572 if (dev->txq.qlen < TX_QLEN (dev)) 1573 netif_wake_queue (dev->net); 1574 } 1575 } 1576 1577 static void usbnet_bh_tasklet(unsigned long data) 1578 { 1579 struct timer_list *t = (struct timer_list *)data; 1580 1581 usbnet_bh(t); 1582 } 1583 1584 1585 /*------------------------------------------------------------------------- 1586 * 1587 * USB Device Driver support 1588 * 1589 *-------------------------------------------------------------------------*/ 1590 1591 // precondition: never called in_interrupt 1592 1593 void usbnet_disconnect (struct usb_interface *intf) 1594 { 1595 struct usbnet *dev; 1596 struct usb_device *xdev; 1597 struct net_device *net; 1598 1599 dev = usb_get_intfdata(intf); 1600 usb_set_intfdata(intf, NULL); 1601 if (!dev) 1602 return; 1603 1604 xdev = interface_to_usbdev (intf); 1605 1606 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", 1607 intf->dev.driver->name, 1608 xdev->bus->bus_name, xdev->devpath, 1609 dev->driver_info->description); 1610 1611 net = dev->net; 1612 unregister_netdev (net); 1613 1614 cancel_work_sync(&dev->kevent); 1615 1616 usb_scuttle_anchored_urbs(&dev->deferred); 1617 1618 if (dev->driver_info->unbind) 1619 dev->driver_info->unbind (dev, intf); 1620 1621 usb_kill_urb(dev->interrupt); 1622 usb_free_urb(dev->interrupt); 1623 kfree(dev->padding_pkt); 1624 1625 free_percpu(dev->stats64); 1626 free_netdev(net); 1627 } 1628 EXPORT_SYMBOL_GPL(usbnet_disconnect); 1629 1630 static const struct net_device_ops usbnet_netdev_ops = { 1631 .ndo_open = usbnet_open, 1632 .ndo_stop = usbnet_stop, 1633 .ndo_start_xmit = usbnet_start_xmit, 1634 .ndo_tx_timeout = usbnet_tx_timeout, 1635 .ndo_set_rx_mode = usbnet_set_rx_mode, 1636 .ndo_change_mtu = usbnet_change_mtu, 1637 .ndo_get_stats64 = usbnet_get_stats64, 1638 .ndo_set_mac_address = eth_mac_addr, 1639 .ndo_validate_addr = eth_validate_addr, 1640 }; 1641 1642 /*-------------------------------------------------------------------------*/ 1643 1644 // precondition: never called in_interrupt 1645 1646 static struct device_type wlan_type = { 1647 .name = "wlan", 1648 }; 1649 1650 static struct device_type wwan_type = { 1651 .name = "wwan", 1652 }; 1653 1654 int 1655 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) 1656 { 1657 struct usbnet *dev; 1658 struct net_device *net; 1659 struct usb_host_interface *interface; 1660 const struct driver_info *info; 1661 struct usb_device *xdev; 1662 int status; 1663 const char *name; 1664 struct usb_driver *driver = to_usb_driver(udev->dev.driver); 1665 1666 /* usbnet already took usb runtime pm, so have to enable the feature 1667 * for usb interface, otherwise usb_autopm_get_interface may return 1668 * failure if RUNTIME_PM is enabled. 1669 */ 1670 if (!driver->supports_autosuspend) { 1671 driver->supports_autosuspend = 1; 1672 pm_runtime_enable(&udev->dev); 1673 } 1674 1675 name = udev->dev.driver->name; 1676 info = (const struct driver_info *) prod->driver_info; 1677 if (!info) { 1678 dev_dbg (&udev->dev, "blacklisted by %s\n", name); 1679 return -ENODEV; 1680 } 1681 xdev = interface_to_usbdev (udev); 1682 interface = udev->cur_altsetting; 1683 1684 status = -ENOMEM; 1685 1686 // set up our own records 1687 net = alloc_etherdev(sizeof(*dev)); 1688 if (!net) 1689 goto out; 1690 1691 /* netdev_printk() needs this so do it as early as possible */ 1692 SET_NETDEV_DEV(net, &udev->dev); 1693 1694 dev = netdev_priv(net); 1695 dev->udev = xdev; 1696 dev->intf = udev; 1697 dev->driver_info = info; 1698 dev->driver_name = name; 1699 1700 dev->stats64 = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1701 if (!dev->stats64) 1702 goto out0; 1703 1704 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV 1705 | NETIF_MSG_PROBE | NETIF_MSG_LINK); 1706 init_waitqueue_head(&dev->wait); 1707 skb_queue_head_init (&dev->rxq); 1708 skb_queue_head_init (&dev->txq); 1709 skb_queue_head_init (&dev->done); 1710 skb_queue_head_init(&dev->rxq_pause); 1711 dev->bh.func = usbnet_bh_tasklet; 1712 dev->bh.data = (unsigned long)&dev->delay; 1713 INIT_WORK (&dev->kevent, usbnet_deferred_kevent); 1714 init_usb_anchor(&dev->deferred); 1715 timer_setup(&dev->delay, usbnet_bh, 0); 1716 mutex_init (&dev->phy_mutex); 1717 mutex_init(&dev->interrupt_mutex); 1718 dev->interrupt_count = 0; 1719 1720 dev->net = net; 1721 strcpy (net->name, "usb%d"); 1722 memcpy (net->dev_addr, node_id, sizeof node_id); 1723 1724 /* rx and tx sides can use different message sizes; 1725 * bind() should set rx_urb_size in that case. 1726 */ 1727 dev->hard_mtu = net->mtu + net->hard_header_len; 1728 net->min_mtu = 0; 1729 net->max_mtu = ETH_MAX_MTU; 1730 1731 net->netdev_ops = &usbnet_netdev_ops; 1732 net->watchdog_timeo = TX_TIMEOUT_JIFFIES; 1733 net->ethtool_ops = &usbnet_ethtool_ops; 1734 1735 // allow device-specific bind/init procedures 1736 // NOTE net->name still not usable ... 1737 if (info->bind) { 1738 status = info->bind (dev, udev); 1739 if (status < 0) 1740 goto out1; 1741 1742 // heuristic: "usb%d" for links we know are two-host, 1743 // else "eth%d" when there's reasonable doubt. userspace 1744 // can rename the link if it knows better. 1745 if ((dev->driver_info->flags & FLAG_ETHER) != 0 && 1746 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 || 1747 (net->dev_addr [0] & 0x02) == 0)) 1748 strcpy (net->name, "eth%d"); 1749 /* WLAN devices should always be named "wlan%d" */ 1750 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1751 strcpy(net->name, "wlan%d"); 1752 /* WWAN devices should always be named "wwan%d" */ 1753 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1754 strcpy(net->name, "wwan%d"); 1755 1756 /* devices that cannot do ARP */ 1757 if ((dev->driver_info->flags & FLAG_NOARP) != 0) 1758 net->flags |= IFF_NOARP; 1759 1760 /* maybe the remote can't receive an Ethernet MTU */ 1761 if (net->mtu > (dev->hard_mtu - net->hard_header_len)) 1762 net->mtu = dev->hard_mtu - net->hard_header_len; 1763 } else if (!info->in || !info->out) 1764 status = usbnet_get_endpoints (dev, udev); 1765 else { 1766 dev->in = usb_rcvbulkpipe (xdev, info->in); 1767 dev->out = usb_sndbulkpipe (xdev, info->out); 1768 if (!(info->flags & FLAG_NO_SETINT)) 1769 status = usb_set_interface (xdev, 1770 interface->desc.bInterfaceNumber, 1771 interface->desc.bAlternateSetting); 1772 else 1773 status = 0; 1774 1775 } 1776 if (status >= 0 && dev->status) 1777 status = init_status (dev, udev); 1778 if (status < 0) 1779 goto out3; 1780 1781 if (!dev->rx_urb_size) 1782 dev->rx_urb_size = dev->hard_mtu; 1783 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); 1784 1785 /* let userspace know we have a random address */ 1786 if (ether_addr_equal(net->dev_addr, node_id)) 1787 net->addr_assign_type = NET_ADDR_RANDOM; 1788 1789 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1790 SET_NETDEV_DEVTYPE(net, &wlan_type); 1791 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1792 SET_NETDEV_DEVTYPE(net, &wwan_type); 1793 1794 /* initialize max rx_qlen and tx_qlen */ 1795 usbnet_update_max_qlen(dev); 1796 1797 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) && 1798 !(info->flags & FLAG_MULTI_PACKET)) { 1799 dev->padding_pkt = kzalloc(1, GFP_KERNEL); 1800 if (!dev->padding_pkt) { 1801 status = -ENOMEM; 1802 goto out4; 1803 } 1804 } 1805 1806 status = register_netdev (net); 1807 if (status) 1808 goto out5; 1809 netif_info(dev, probe, dev->net, 1810 "register '%s' at usb-%s-%s, %s, %pM\n", 1811 udev->dev.driver->name, 1812 xdev->bus->bus_name, xdev->devpath, 1813 dev->driver_info->description, 1814 net->dev_addr); 1815 1816 // ok, it's ready to go. 1817 usb_set_intfdata (udev, dev); 1818 1819 netif_device_attach (net); 1820 1821 if (dev->driver_info->flags & FLAG_LINK_INTR) 1822 usbnet_link_change(dev, 0, 0); 1823 1824 return 0; 1825 1826 out5: 1827 kfree(dev->padding_pkt); 1828 out4: 1829 usb_free_urb(dev->interrupt); 1830 out3: 1831 if (info->unbind) 1832 info->unbind (dev, udev); 1833 out1: 1834 /* subdrivers must undo all they did in bind() if they 1835 * fail it, but we may fail later and a deferred kevent 1836 * may trigger an error resubmitting itself and, worse, 1837 * schedule a timer. So we kill it all just in case. 1838 */ 1839 cancel_work_sync(&dev->kevent); 1840 del_timer_sync(&dev->delay); 1841 free_percpu(dev->stats64); 1842 out0: 1843 free_netdev(net); 1844 out: 1845 return status; 1846 } 1847 EXPORT_SYMBOL_GPL(usbnet_probe); 1848 1849 /*-------------------------------------------------------------------------*/ 1850 1851 /* 1852 * suspend the whole driver as soon as the first interface is suspended 1853 * resume only when the last interface is resumed 1854 */ 1855 1856 int usbnet_suspend (struct usb_interface *intf, pm_message_t message) 1857 { 1858 struct usbnet *dev = usb_get_intfdata(intf); 1859 1860 if (!dev->suspend_count++) { 1861 spin_lock_irq(&dev->txq.lock); 1862 /* don't autosuspend while transmitting */ 1863 if (dev->txq.qlen && PMSG_IS_AUTO(message)) { 1864 dev->suspend_count--; 1865 spin_unlock_irq(&dev->txq.lock); 1866 return -EBUSY; 1867 } else { 1868 set_bit(EVENT_DEV_ASLEEP, &dev->flags); 1869 spin_unlock_irq(&dev->txq.lock); 1870 } 1871 /* 1872 * accelerate emptying of the rx and queues, to avoid 1873 * having everything error out. 1874 */ 1875 netif_device_detach (dev->net); 1876 usbnet_terminate_urbs(dev); 1877 __usbnet_status_stop_force(dev); 1878 1879 /* 1880 * reattach so runtime management can use and 1881 * wake the device 1882 */ 1883 netif_device_attach (dev->net); 1884 } 1885 return 0; 1886 } 1887 EXPORT_SYMBOL_GPL(usbnet_suspend); 1888 1889 int usbnet_resume (struct usb_interface *intf) 1890 { 1891 struct usbnet *dev = usb_get_intfdata(intf); 1892 struct sk_buff *skb; 1893 struct urb *res; 1894 int retval; 1895 1896 if (!--dev->suspend_count) { 1897 /* resume interrupt URB if it was previously submitted */ 1898 __usbnet_status_start_force(dev, GFP_NOIO); 1899 1900 spin_lock_irq(&dev->txq.lock); 1901 while ((res = usb_get_from_anchor(&dev->deferred))) { 1902 1903 skb = (struct sk_buff *)res->context; 1904 retval = usb_submit_urb(res, GFP_ATOMIC); 1905 if (retval < 0) { 1906 dev_kfree_skb_any(skb); 1907 kfree(res->sg); 1908 usb_free_urb(res); 1909 usb_autopm_put_interface_async(dev->intf); 1910 } else { 1911 netif_trans_update(dev->net); 1912 __skb_queue_tail(&dev->txq, skb); 1913 } 1914 } 1915 1916 smp_mb(); 1917 clear_bit(EVENT_DEV_ASLEEP, &dev->flags); 1918 spin_unlock_irq(&dev->txq.lock); 1919 1920 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) { 1921 /* handle remote wakeup ASAP 1922 * we cannot race against stop 1923 */ 1924 if (netif_device_present(dev->net) && 1925 !timer_pending(&dev->delay) && 1926 !test_bit(EVENT_RX_HALT, &dev->flags)) 1927 rx_alloc_submit(dev, GFP_NOIO); 1928 1929 if (!(dev->txq.qlen >= TX_QLEN(dev))) 1930 netif_tx_wake_all_queues(dev->net); 1931 tasklet_schedule (&dev->bh); 1932 } 1933 } 1934 1935 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) 1936 usb_autopm_get_interface_no_resume(intf); 1937 1938 return 0; 1939 } 1940 EXPORT_SYMBOL_GPL(usbnet_resume); 1941 1942 /* 1943 * Either a subdriver implements manage_power, then it is assumed to always 1944 * be ready to be suspended or it reports the readiness to be suspended 1945 * explicitly 1946 */ 1947 void usbnet_device_suggests_idle(struct usbnet *dev) 1948 { 1949 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) { 1950 dev->intf->needs_remote_wakeup = 1; 1951 usb_autopm_put_interface_async(dev->intf); 1952 } 1953 } 1954 EXPORT_SYMBOL(usbnet_device_suggests_idle); 1955 1956 /* 1957 * For devices that can do without special commands 1958 */ 1959 int usbnet_manage_power(struct usbnet *dev, int on) 1960 { 1961 dev->intf->needs_remote_wakeup = on; 1962 return 0; 1963 } 1964 EXPORT_SYMBOL(usbnet_manage_power); 1965 1966 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset) 1967 { 1968 /* update link after link is reseted */ 1969 if (link && !need_reset) 1970 netif_carrier_on(dev->net); 1971 else 1972 netif_carrier_off(dev->net); 1973 1974 if (need_reset && link) 1975 usbnet_defer_kevent(dev, EVENT_LINK_RESET); 1976 else 1977 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE); 1978 } 1979 EXPORT_SYMBOL(usbnet_link_change); 1980 1981 /*-------------------------------------------------------------------------*/ 1982 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1983 u16 value, u16 index, void *data, u16 size) 1984 { 1985 void *buf = NULL; 1986 int err = -ENOMEM; 1987 1988 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x" 1989 " value=0x%04x index=0x%04x size=%d\n", 1990 cmd, reqtype, value, index, size); 1991 1992 if (size) { 1993 buf = kmalloc(size, GFP_KERNEL); 1994 if (!buf) 1995 goto out; 1996 } 1997 1998 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), 1999 cmd, reqtype, value, index, buf, size, 2000 USB_CTRL_GET_TIMEOUT); 2001 if (err > 0 && err <= size) { 2002 if (data) 2003 memcpy(data, buf, err); 2004 else 2005 netdev_dbg(dev->net, 2006 "Huh? Data requested but thrown away.\n"); 2007 } 2008 kfree(buf); 2009 out: 2010 return err; 2011 } 2012 2013 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 2014 u16 value, u16 index, const void *data, 2015 u16 size) 2016 { 2017 void *buf = NULL; 2018 int err = -ENOMEM; 2019 2020 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 2021 " value=0x%04x index=0x%04x size=%d\n", 2022 cmd, reqtype, value, index, size); 2023 2024 if (data) { 2025 buf = kmemdup(data, size, GFP_KERNEL); 2026 if (!buf) 2027 goto out; 2028 } else { 2029 if (size) { 2030 WARN_ON_ONCE(1); 2031 err = -EINVAL; 2032 goto out; 2033 } 2034 } 2035 2036 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), 2037 cmd, reqtype, value, index, buf, size, 2038 USB_CTRL_SET_TIMEOUT); 2039 kfree(buf); 2040 2041 out: 2042 return err; 2043 } 2044 2045 /* 2046 * The function can't be called inside suspend/resume callback, 2047 * otherwise deadlock will be caused. 2048 */ 2049 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 2050 u16 value, u16 index, void *data, u16 size) 2051 { 2052 int ret; 2053 2054 if (usb_autopm_get_interface(dev->intf) < 0) 2055 return -ENODEV; 2056 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index, 2057 data, size); 2058 usb_autopm_put_interface(dev->intf); 2059 return ret; 2060 } 2061 EXPORT_SYMBOL_GPL(usbnet_read_cmd); 2062 2063 /* 2064 * The function can't be called inside suspend/resume callback, 2065 * otherwise deadlock will be caused. 2066 */ 2067 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 2068 u16 value, u16 index, const void *data, u16 size) 2069 { 2070 int ret; 2071 2072 if (usb_autopm_get_interface(dev->intf) < 0) 2073 return -ENODEV; 2074 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index, 2075 data, size); 2076 usb_autopm_put_interface(dev->intf); 2077 return ret; 2078 } 2079 EXPORT_SYMBOL_GPL(usbnet_write_cmd); 2080 2081 /* 2082 * The function can be called inside suspend/resume callback safely 2083 * and should only be called by suspend/resume callback generally. 2084 */ 2085 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 2086 u16 value, u16 index, void *data, u16 size) 2087 { 2088 return __usbnet_read_cmd(dev, cmd, reqtype, value, index, 2089 data, size); 2090 } 2091 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm); 2092 2093 /* 2094 * The function can be called inside suspend/resume callback safely 2095 * and should only be called by suspend/resume callback generally. 2096 */ 2097 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 2098 u16 value, u16 index, const void *data, 2099 u16 size) 2100 { 2101 return __usbnet_write_cmd(dev, cmd, reqtype, value, index, 2102 data, size); 2103 } 2104 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm); 2105 2106 static void usbnet_async_cmd_cb(struct urb *urb) 2107 { 2108 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context; 2109 int status = urb->status; 2110 2111 if (status < 0) 2112 dev_dbg(&urb->dev->dev, "%s failed with %d", 2113 __func__, status); 2114 2115 kfree(req); 2116 usb_free_urb(urb); 2117 } 2118 2119 /* 2120 * The caller must make sure that device can't be put into suspend 2121 * state until the control URB completes. 2122 */ 2123 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype, 2124 u16 value, u16 index, const void *data, u16 size) 2125 { 2126 struct usb_ctrlrequest *req = NULL; 2127 struct urb *urb; 2128 int err = -ENOMEM; 2129 void *buf = NULL; 2130 2131 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 2132 " value=0x%04x index=0x%04x size=%d\n", 2133 cmd, reqtype, value, index, size); 2134 2135 urb = usb_alloc_urb(0, GFP_ATOMIC); 2136 if (!urb) 2137 goto fail; 2138 2139 if (data) { 2140 buf = kmemdup(data, size, GFP_ATOMIC); 2141 if (!buf) { 2142 netdev_err(dev->net, "Error allocating buffer" 2143 " in %s!\n", __func__); 2144 goto fail_free; 2145 } 2146 } 2147 2148 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC); 2149 if (!req) 2150 goto fail_free_buf; 2151 2152 req->bRequestType = reqtype; 2153 req->bRequest = cmd; 2154 req->wValue = cpu_to_le16(value); 2155 req->wIndex = cpu_to_le16(index); 2156 req->wLength = cpu_to_le16(size); 2157 2158 usb_fill_control_urb(urb, dev->udev, 2159 usb_sndctrlpipe(dev->udev, 0), 2160 (void *)req, buf, size, 2161 usbnet_async_cmd_cb, req); 2162 urb->transfer_flags |= URB_FREE_BUFFER; 2163 2164 err = usb_submit_urb(urb, GFP_ATOMIC); 2165 if (err < 0) { 2166 netdev_err(dev->net, "Error submitting the control" 2167 " message: status=%d\n", err); 2168 goto fail_free; 2169 } 2170 return 0; 2171 2172 fail_free_buf: 2173 kfree(buf); 2174 fail_free: 2175 kfree(req); 2176 usb_free_urb(urb); 2177 fail: 2178 return err; 2179 2180 } 2181 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async); 2182 /*-------------------------------------------------------------------------*/ 2183 2184 static int __init usbnet_init(void) 2185 { 2186 /* Compiler should optimize this out. */ 2187 BUILD_BUG_ON( 2188 sizeof_field(struct sk_buff, cb) < sizeof(struct skb_data)); 2189 2190 eth_random_addr(node_id); 2191 return 0; 2192 } 2193 module_init(usbnet_init); 2194 2195 static void __exit usbnet_exit(void) 2196 { 2197 } 2198 module_exit(usbnet_exit); 2199 2200 MODULE_AUTHOR("David Brownell"); 2201 MODULE_DESCRIPTION("USB network driver framework"); 2202 MODULE_LICENSE("GPL"); 2203