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 static 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 1118 static void __handle_set_rx_mode(struct usbnet *dev) 1119 { 1120 if (dev->driver_info->set_rx_mode) 1121 (dev->driver_info->set_rx_mode)(dev); 1122 1123 clear_bit(EVENT_SET_RX_MODE, &dev->flags); 1124 } 1125 1126 /* work that cannot be done in interrupt context uses keventd. 1127 * 1128 * NOTE: with 2.5 we could do more of this using completion callbacks, 1129 * especially now that control transfers can be queued. 1130 */ 1131 static void 1132 usbnet_deferred_kevent (struct work_struct *work) 1133 { 1134 struct usbnet *dev = 1135 container_of(work, struct usbnet, kevent); 1136 int status; 1137 1138 /* usb_clear_halt() needs a thread context */ 1139 if (test_bit (EVENT_TX_HALT, &dev->flags)) { 1140 unlink_urbs (dev, &dev->txq); 1141 status = usb_autopm_get_interface(dev->intf); 1142 if (status < 0) 1143 goto fail_pipe; 1144 status = usb_clear_halt (dev->udev, dev->out); 1145 usb_autopm_put_interface(dev->intf); 1146 if (status < 0 && 1147 status != -EPIPE && 1148 status != -ESHUTDOWN) { 1149 if (netif_msg_tx_err (dev)) 1150 fail_pipe: 1151 netdev_err(dev->net, "can't clear tx halt, status %d\n", 1152 status); 1153 } else { 1154 clear_bit (EVENT_TX_HALT, &dev->flags); 1155 if (status != -ESHUTDOWN) 1156 netif_wake_queue (dev->net); 1157 } 1158 } 1159 if (test_bit (EVENT_RX_HALT, &dev->flags)) { 1160 unlink_urbs (dev, &dev->rxq); 1161 status = usb_autopm_get_interface(dev->intf); 1162 if (status < 0) 1163 goto fail_halt; 1164 status = usb_clear_halt (dev->udev, dev->in); 1165 usb_autopm_put_interface(dev->intf); 1166 if (status < 0 && 1167 status != -EPIPE && 1168 status != -ESHUTDOWN) { 1169 if (netif_msg_rx_err (dev)) 1170 fail_halt: 1171 netdev_err(dev->net, "can't clear rx halt, status %d\n", 1172 status); 1173 } else { 1174 clear_bit (EVENT_RX_HALT, &dev->flags); 1175 tasklet_schedule (&dev->bh); 1176 } 1177 } 1178 1179 /* tasklet could resubmit itself forever if memory is tight */ 1180 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { 1181 struct urb *urb = NULL; 1182 int resched = 1; 1183 1184 if (netif_running (dev->net)) 1185 urb = usb_alloc_urb (0, GFP_KERNEL); 1186 else 1187 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1188 if (urb != NULL) { 1189 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1190 status = usb_autopm_get_interface(dev->intf); 1191 if (status < 0) { 1192 usb_free_urb(urb); 1193 goto fail_lowmem; 1194 } 1195 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) 1196 resched = 0; 1197 usb_autopm_put_interface(dev->intf); 1198 fail_lowmem: 1199 if (resched) 1200 tasklet_schedule (&dev->bh); 1201 } 1202 } 1203 1204 if (test_bit (EVENT_LINK_RESET, &dev->flags)) { 1205 const struct driver_info *info = dev->driver_info; 1206 int retval = 0; 1207 1208 clear_bit (EVENT_LINK_RESET, &dev->flags); 1209 status = usb_autopm_get_interface(dev->intf); 1210 if (status < 0) 1211 goto skip_reset; 1212 if(info->link_reset && (retval = info->link_reset(dev)) < 0) { 1213 usb_autopm_put_interface(dev->intf); 1214 skip_reset: 1215 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", 1216 retval, 1217 dev->udev->bus->bus_name, 1218 dev->udev->devpath, 1219 info->description); 1220 } else { 1221 usb_autopm_put_interface(dev->intf); 1222 } 1223 1224 /* handle link change from link resetting */ 1225 __handle_link_change(dev); 1226 } 1227 1228 if (test_bit (EVENT_LINK_CHANGE, &dev->flags)) 1229 __handle_link_change(dev); 1230 1231 if (test_bit (EVENT_SET_RX_MODE, &dev->flags)) 1232 __handle_set_rx_mode(dev); 1233 1234 1235 if (dev->flags) 1236 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); 1237 } 1238 1239 /*-------------------------------------------------------------------------*/ 1240 1241 static void tx_complete (struct urb *urb) 1242 { 1243 struct sk_buff *skb = (struct sk_buff *) urb->context; 1244 struct skb_data *entry = (struct skb_data *) skb->cb; 1245 struct usbnet *dev = entry->dev; 1246 1247 if (urb->status == 0) { 1248 struct pcpu_sw_netstats *stats64 = this_cpu_ptr(dev->stats64); 1249 unsigned long flags; 1250 1251 flags = u64_stats_update_begin_irqsave(&stats64->syncp); 1252 stats64->tx_packets += entry->packets; 1253 stats64->tx_bytes += entry->length; 1254 u64_stats_update_end_irqrestore(&stats64->syncp, flags); 1255 } else { 1256 dev->net->stats.tx_errors++; 1257 1258 switch (urb->status) { 1259 case -EPIPE: 1260 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1261 break; 1262 1263 /* software-driven interface shutdown */ 1264 case -ECONNRESET: // async unlink 1265 case -ESHUTDOWN: // hardware gone 1266 break; 1267 1268 /* like rx, tx gets controller i/o faults during hub_wq 1269 * delays and so it uses the same throttling mechanism. 1270 */ 1271 case -EPROTO: 1272 case -ETIME: 1273 case -EILSEQ: 1274 usb_mark_last_busy(dev->udev); 1275 if (!timer_pending (&dev->delay)) { 1276 mod_timer (&dev->delay, 1277 jiffies + THROTTLE_JIFFIES); 1278 netif_dbg(dev, link, dev->net, 1279 "tx throttle %d\n", urb->status); 1280 } 1281 netif_stop_queue (dev->net); 1282 break; 1283 default: 1284 netif_dbg(dev, tx_err, dev->net, 1285 "tx err %d\n", entry->urb->status); 1286 break; 1287 } 1288 } 1289 1290 usb_autopm_put_interface_async(dev->intf); 1291 (void) defer_bh(dev, skb, &dev->txq, tx_done); 1292 } 1293 1294 /*-------------------------------------------------------------------------*/ 1295 1296 void usbnet_tx_timeout (struct net_device *net) 1297 { 1298 struct usbnet *dev = netdev_priv(net); 1299 1300 unlink_urbs (dev, &dev->txq); 1301 tasklet_schedule (&dev->bh); 1302 /* this needs to be handled individually because the generic layer 1303 * doesn't know what is sufficient and could not restore private 1304 * information if a remedy of an unconditional reset were used. 1305 */ 1306 if (dev->driver_info->recover) 1307 (dev->driver_info->recover)(dev); 1308 } 1309 EXPORT_SYMBOL_GPL(usbnet_tx_timeout); 1310 1311 /*-------------------------------------------------------------------------*/ 1312 1313 static int build_dma_sg(const struct sk_buff *skb, struct urb *urb) 1314 { 1315 unsigned num_sgs, total_len = 0; 1316 int i, s = 0; 1317 1318 num_sgs = skb_shinfo(skb)->nr_frags + 1; 1319 if (num_sgs == 1) 1320 return 0; 1321 1322 /* reserve one for zero packet */ 1323 urb->sg = kmalloc_array(num_sgs + 1, sizeof(struct scatterlist), 1324 GFP_ATOMIC); 1325 if (!urb->sg) 1326 return -ENOMEM; 1327 1328 urb->num_sgs = num_sgs; 1329 sg_init_table(urb->sg, urb->num_sgs + 1); 1330 1331 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb)); 1332 total_len += skb_headlen(skb); 1333 1334 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1335 skb_frag_t *f = &skb_shinfo(skb)->frags[i]; 1336 1337 total_len += skb_frag_size(f); 1338 sg_set_page(&urb->sg[i + s], skb_frag_page(f), skb_frag_size(f), 1339 skb_frag_off(f)); 1340 } 1341 urb->transfer_buffer_length = total_len; 1342 1343 return 1; 1344 } 1345 1346 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, 1347 struct net_device *net) 1348 { 1349 struct usbnet *dev = netdev_priv(net); 1350 unsigned int length; 1351 struct urb *urb = NULL; 1352 struct skb_data *entry; 1353 const struct driver_info *info = dev->driver_info; 1354 unsigned long flags; 1355 int retval; 1356 1357 if (skb) 1358 skb_tx_timestamp(skb); 1359 1360 // some devices want funky USB-level framing, for 1361 // win32 driver (usually) and/or hardware quirks 1362 if (info->tx_fixup) { 1363 skb = info->tx_fixup (dev, skb, GFP_ATOMIC); 1364 if (!skb) { 1365 /* packet collected; minidriver waiting for more */ 1366 if (info->flags & FLAG_MULTI_PACKET) 1367 goto not_drop; 1368 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); 1369 goto drop; 1370 } 1371 } 1372 1373 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { 1374 netif_dbg(dev, tx_err, dev->net, "no urb\n"); 1375 goto drop; 1376 } 1377 1378 entry = (struct skb_data *) skb->cb; 1379 entry->urb = urb; 1380 entry->dev = dev; 1381 1382 usb_fill_bulk_urb (urb, dev->udev, dev->out, 1383 skb->data, skb->len, tx_complete, skb); 1384 if (dev->can_dma_sg) { 1385 if (build_dma_sg(skb, urb) < 0) 1386 goto drop; 1387 } 1388 length = urb->transfer_buffer_length; 1389 1390 /* don't assume the hardware handles USB_ZERO_PACKET 1391 * NOTE: strictly conforming cdc-ether devices should expect 1392 * the ZLP here, but ignore the one-byte packet. 1393 * NOTE2: CDC NCM specification is different from CDC ECM when 1394 * handling ZLP/short packets, so cdc_ncm driver will make short 1395 * packet itself if needed. 1396 */ 1397 if (length % dev->maxpacket == 0) { 1398 if (!(info->flags & FLAG_SEND_ZLP)) { 1399 if (!(info->flags & FLAG_MULTI_PACKET)) { 1400 length++; 1401 if (skb_tailroom(skb) && !urb->num_sgs) { 1402 skb->data[skb->len] = 0; 1403 __skb_put(skb, 1); 1404 } else if (urb->num_sgs) 1405 sg_set_buf(&urb->sg[urb->num_sgs++], 1406 dev->padding_pkt, 1); 1407 } 1408 } else 1409 urb->transfer_flags |= URB_ZERO_PACKET; 1410 } 1411 urb->transfer_buffer_length = length; 1412 1413 if (info->flags & FLAG_MULTI_PACKET) { 1414 /* Driver has set number of packets and a length delta. 1415 * Calculate the complete length and ensure that it's 1416 * positive. 1417 */ 1418 entry->length += length; 1419 if (WARN_ON_ONCE(entry->length <= 0)) 1420 entry->length = length; 1421 } else { 1422 usbnet_set_skb_tx_stats(skb, 1, length); 1423 } 1424 1425 spin_lock_irqsave(&dev->txq.lock, flags); 1426 retval = usb_autopm_get_interface_async(dev->intf); 1427 if (retval < 0) { 1428 spin_unlock_irqrestore(&dev->txq.lock, flags); 1429 goto drop; 1430 } 1431 if (netif_queue_stopped(net)) { 1432 usb_autopm_put_interface_async(dev->intf); 1433 spin_unlock_irqrestore(&dev->txq.lock, flags); 1434 goto drop; 1435 } 1436 1437 #ifdef CONFIG_PM 1438 /* if this triggers the device is still a sleep */ 1439 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { 1440 /* transmission will be done in resume */ 1441 usb_anchor_urb(urb, &dev->deferred); 1442 /* no use to process more packets */ 1443 netif_stop_queue(net); 1444 usb_put_urb(urb); 1445 spin_unlock_irqrestore(&dev->txq.lock, flags); 1446 netdev_dbg(dev->net, "Delaying transmission for resumption\n"); 1447 goto deferred; 1448 } 1449 #endif 1450 1451 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { 1452 case -EPIPE: 1453 netif_stop_queue (net); 1454 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1455 usb_autopm_put_interface_async(dev->intf); 1456 break; 1457 default: 1458 usb_autopm_put_interface_async(dev->intf); 1459 netif_dbg(dev, tx_err, dev->net, 1460 "tx: submit urb err %d\n", retval); 1461 break; 1462 case 0: 1463 netif_trans_update(net); 1464 __usbnet_queue_skb(&dev->txq, skb, tx_start); 1465 if (dev->txq.qlen >= TX_QLEN (dev)) 1466 netif_stop_queue (net); 1467 } 1468 spin_unlock_irqrestore (&dev->txq.lock, flags); 1469 1470 if (retval) { 1471 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); 1472 drop: 1473 dev->net->stats.tx_dropped++; 1474 not_drop: 1475 if (skb) 1476 dev_kfree_skb_any (skb); 1477 if (urb) { 1478 kfree(urb->sg); 1479 usb_free_urb(urb); 1480 } 1481 } else 1482 netif_dbg(dev, tx_queued, dev->net, 1483 "> tx, len %u, type 0x%x\n", length, skb->protocol); 1484 #ifdef CONFIG_PM 1485 deferred: 1486 #endif 1487 return NETDEV_TX_OK; 1488 } 1489 EXPORT_SYMBOL_GPL(usbnet_start_xmit); 1490 1491 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags) 1492 { 1493 struct urb *urb; 1494 int i; 1495 int ret = 0; 1496 1497 /* don't refill the queue all at once */ 1498 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) { 1499 urb = usb_alloc_urb(0, flags); 1500 if (urb != NULL) { 1501 ret = rx_submit(dev, urb, flags); 1502 if (ret) 1503 goto err; 1504 } else { 1505 ret = -ENOMEM; 1506 goto err; 1507 } 1508 } 1509 err: 1510 return ret; 1511 } 1512 1513 /*-------------------------------------------------------------------------*/ 1514 1515 // tasklet (work deferred from completions, in_irq) or timer 1516 1517 static void usbnet_bh (struct timer_list *t) 1518 { 1519 struct usbnet *dev = from_timer(dev, t, delay); 1520 struct sk_buff *skb; 1521 struct skb_data *entry; 1522 1523 while ((skb = skb_dequeue (&dev->done))) { 1524 entry = (struct skb_data *) skb->cb; 1525 switch (entry->state) { 1526 case rx_done: 1527 entry->state = rx_cleanup; 1528 rx_process (dev, skb); 1529 continue; 1530 case tx_done: 1531 kfree(entry->urb->sg); 1532 /* fall through */ 1533 case rx_cleanup: 1534 usb_free_urb (entry->urb); 1535 dev_kfree_skb (skb); 1536 continue; 1537 default: 1538 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); 1539 } 1540 } 1541 1542 /* restart RX again after disabling due to high error rate */ 1543 clear_bit(EVENT_RX_KILL, &dev->flags); 1544 1545 /* waiting for all pending urbs to complete? 1546 * only then can we forgo submitting anew 1547 */ 1548 if (waitqueue_active(&dev->wait)) { 1549 if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0) 1550 wake_up_all(&dev->wait); 1551 1552 // or are we maybe short a few urbs? 1553 } else if (netif_running (dev->net) && 1554 netif_device_present (dev->net) && 1555 netif_carrier_ok(dev->net) && 1556 !timer_pending(&dev->delay) && 1557 !test_bit(EVENT_RX_PAUSED, &dev->flags) && 1558 !test_bit(EVENT_RX_HALT, &dev->flags)) { 1559 int temp = dev->rxq.qlen; 1560 1561 if (temp < RX_QLEN(dev)) { 1562 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK) 1563 return; 1564 if (temp != dev->rxq.qlen) 1565 netif_dbg(dev, link, dev->net, 1566 "rxqlen %d --> %d\n", 1567 temp, dev->rxq.qlen); 1568 if (dev->rxq.qlen < RX_QLEN(dev)) 1569 tasklet_schedule (&dev->bh); 1570 } 1571 if (dev->txq.qlen < TX_QLEN (dev)) 1572 netif_wake_queue (dev->net); 1573 } 1574 } 1575 1576 1577 /*------------------------------------------------------------------------- 1578 * 1579 * USB Device Driver support 1580 * 1581 *-------------------------------------------------------------------------*/ 1582 1583 // precondition: never called in_interrupt 1584 1585 void usbnet_disconnect (struct usb_interface *intf) 1586 { 1587 struct usbnet *dev; 1588 struct usb_device *xdev; 1589 struct net_device *net; 1590 1591 dev = usb_get_intfdata(intf); 1592 usb_set_intfdata(intf, NULL); 1593 if (!dev) 1594 return; 1595 1596 xdev = interface_to_usbdev (intf); 1597 1598 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", 1599 intf->dev.driver->name, 1600 xdev->bus->bus_name, xdev->devpath, 1601 dev->driver_info->description); 1602 1603 net = dev->net; 1604 unregister_netdev (net); 1605 1606 cancel_work_sync(&dev->kevent); 1607 1608 usb_scuttle_anchored_urbs(&dev->deferred); 1609 1610 if (dev->driver_info->unbind) 1611 dev->driver_info->unbind (dev, intf); 1612 1613 usb_kill_urb(dev->interrupt); 1614 usb_free_urb(dev->interrupt); 1615 kfree(dev->padding_pkt); 1616 1617 free_percpu(dev->stats64); 1618 free_netdev(net); 1619 } 1620 EXPORT_SYMBOL_GPL(usbnet_disconnect); 1621 1622 static const struct net_device_ops usbnet_netdev_ops = { 1623 .ndo_open = usbnet_open, 1624 .ndo_stop = usbnet_stop, 1625 .ndo_start_xmit = usbnet_start_xmit, 1626 .ndo_tx_timeout = usbnet_tx_timeout, 1627 .ndo_set_rx_mode = usbnet_set_rx_mode, 1628 .ndo_change_mtu = usbnet_change_mtu, 1629 .ndo_get_stats64 = usbnet_get_stats64, 1630 .ndo_set_mac_address = eth_mac_addr, 1631 .ndo_validate_addr = eth_validate_addr, 1632 }; 1633 1634 /*-------------------------------------------------------------------------*/ 1635 1636 // precondition: never called in_interrupt 1637 1638 static struct device_type wlan_type = { 1639 .name = "wlan", 1640 }; 1641 1642 static struct device_type wwan_type = { 1643 .name = "wwan", 1644 }; 1645 1646 int 1647 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) 1648 { 1649 struct usbnet *dev; 1650 struct net_device *net; 1651 struct usb_host_interface *interface; 1652 const struct driver_info *info; 1653 struct usb_device *xdev; 1654 int status; 1655 const char *name; 1656 struct usb_driver *driver = to_usb_driver(udev->dev.driver); 1657 1658 /* usbnet already took usb runtime pm, so have to enable the feature 1659 * for usb interface, otherwise usb_autopm_get_interface may return 1660 * failure if RUNTIME_PM is enabled. 1661 */ 1662 if (!driver->supports_autosuspend) { 1663 driver->supports_autosuspend = 1; 1664 pm_runtime_enable(&udev->dev); 1665 } 1666 1667 name = udev->dev.driver->name; 1668 info = (const struct driver_info *) prod->driver_info; 1669 if (!info) { 1670 dev_dbg (&udev->dev, "blacklisted by %s\n", name); 1671 return -ENODEV; 1672 } 1673 xdev = interface_to_usbdev (udev); 1674 interface = udev->cur_altsetting; 1675 1676 status = -ENOMEM; 1677 1678 // set up our own records 1679 net = alloc_etherdev(sizeof(*dev)); 1680 if (!net) 1681 goto out; 1682 1683 /* netdev_printk() needs this so do it as early as possible */ 1684 SET_NETDEV_DEV(net, &udev->dev); 1685 1686 dev = netdev_priv(net); 1687 dev->udev = xdev; 1688 dev->intf = udev; 1689 dev->driver_info = info; 1690 dev->driver_name = name; 1691 1692 dev->stats64 = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1693 if (!dev->stats64) 1694 goto out0; 1695 1696 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV 1697 | NETIF_MSG_PROBE | NETIF_MSG_LINK); 1698 init_waitqueue_head(&dev->wait); 1699 skb_queue_head_init (&dev->rxq); 1700 skb_queue_head_init (&dev->txq); 1701 skb_queue_head_init (&dev->done); 1702 skb_queue_head_init(&dev->rxq_pause); 1703 dev->bh.func = (void (*)(unsigned long))usbnet_bh; 1704 dev->bh.data = (unsigned long)&dev->delay; 1705 INIT_WORK (&dev->kevent, usbnet_deferred_kevent); 1706 init_usb_anchor(&dev->deferred); 1707 timer_setup(&dev->delay, usbnet_bh, 0); 1708 mutex_init (&dev->phy_mutex); 1709 mutex_init(&dev->interrupt_mutex); 1710 dev->interrupt_count = 0; 1711 1712 dev->net = net; 1713 strcpy (net->name, "usb%d"); 1714 memcpy (net->dev_addr, node_id, sizeof node_id); 1715 1716 /* rx and tx sides can use different message sizes; 1717 * bind() should set rx_urb_size in that case. 1718 */ 1719 dev->hard_mtu = net->mtu + net->hard_header_len; 1720 net->min_mtu = 0; 1721 net->max_mtu = ETH_MAX_MTU; 1722 1723 net->netdev_ops = &usbnet_netdev_ops; 1724 net->watchdog_timeo = TX_TIMEOUT_JIFFIES; 1725 net->ethtool_ops = &usbnet_ethtool_ops; 1726 1727 // allow device-specific bind/init procedures 1728 // NOTE net->name still not usable ... 1729 if (info->bind) { 1730 status = info->bind (dev, udev); 1731 if (status < 0) 1732 goto out1; 1733 1734 // heuristic: "usb%d" for links we know are two-host, 1735 // else "eth%d" when there's reasonable doubt. userspace 1736 // can rename the link if it knows better. 1737 if ((dev->driver_info->flags & FLAG_ETHER) != 0 && 1738 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 || 1739 (net->dev_addr [0] & 0x02) == 0)) 1740 strcpy (net->name, "eth%d"); 1741 /* WLAN devices should always be named "wlan%d" */ 1742 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1743 strcpy(net->name, "wlan%d"); 1744 /* WWAN devices should always be named "wwan%d" */ 1745 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1746 strcpy(net->name, "wwan%d"); 1747 1748 /* devices that cannot do ARP */ 1749 if ((dev->driver_info->flags & FLAG_NOARP) != 0) 1750 net->flags |= IFF_NOARP; 1751 1752 /* maybe the remote can't receive an Ethernet MTU */ 1753 if (net->mtu > (dev->hard_mtu - net->hard_header_len)) 1754 net->mtu = dev->hard_mtu - net->hard_header_len; 1755 } else if (!info->in || !info->out) 1756 status = usbnet_get_endpoints (dev, udev); 1757 else { 1758 dev->in = usb_rcvbulkpipe (xdev, info->in); 1759 dev->out = usb_sndbulkpipe (xdev, info->out); 1760 if (!(info->flags & FLAG_NO_SETINT)) 1761 status = usb_set_interface (xdev, 1762 interface->desc.bInterfaceNumber, 1763 interface->desc.bAlternateSetting); 1764 else 1765 status = 0; 1766 1767 } 1768 if (status >= 0 && dev->status) 1769 status = init_status (dev, udev); 1770 if (status < 0) 1771 goto out3; 1772 1773 if (!dev->rx_urb_size) 1774 dev->rx_urb_size = dev->hard_mtu; 1775 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); 1776 1777 /* let userspace know we have a random address */ 1778 if (ether_addr_equal(net->dev_addr, node_id)) 1779 net->addr_assign_type = NET_ADDR_RANDOM; 1780 1781 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1782 SET_NETDEV_DEVTYPE(net, &wlan_type); 1783 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1784 SET_NETDEV_DEVTYPE(net, &wwan_type); 1785 1786 /* initialize max rx_qlen and tx_qlen */ 1787 usbnet_update_max_qlen(dev); 1788 1789 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) && 1790 !(info->flags & FLAG_MULTI_PACKET)) { 1791 dev->padding_pkt = kzalloc(1, GFP_KERNEL); 1792 if (!dev->padding_pkt) { 1793 status = -ENOMEM; 1794 goto out4; 1795 } 1796 } 1797 1798 status = register_netdev (net); 1799 if (status) 1800 goto out5; 1801 netif_info(dev, probe, dev->net, 1802 "register '%s' at usb-%s-%s, %s, %pM\n", 1803 udev->dev.driver->name, 1804 xdev->bus->bus_name, xdev->devpath, 1805 dev->driver_info->description, 1806 net->dev_addr); 1807 1808 // ok, it's ready to go. 1809 usb_set_intfdata (udev, dev); 1810 1811 netif_device_attach (net); 1812 1813 if (dev->driver_info->flags & FLAG_LINK_INTR) 1814 usbnet_link_change(dev, 0, 0); 1815 1816 return 0; 1817 1818 out5: 1819 kfree(dev->padding_pkt); 1820 out4: 1821 usb_free_urb(dev->interrupt); 1822 out3: 1823 if (info->unbind) 1824 info->unbind (dev, udev); 1825 out1: 1826 /* subdrivers must undo all they did in bind() if they 1827 * fail it, but we may fail later and a deferred kevent 1828 * may trigger an error resubmitting itself and, worse, 1829 * schedule a timer. So we kill it all just in case. 1830 */ 1831 cancel_work_sync(&dev->kevent); 1832 del_timer_sync(&dev->delay); 1833 free_percpu(dev->stats64); 1834 out0: 1835 free_netdev(net); 1836 out: 1837 return status; 1838 } 1839 EXPORT_SYMBOL_GPL(usbnet_probe); 1840 1841 /*-------------------------------------------------------------------------*/ 1842 1843 /* 1844 * suspend the whole driver as soon as the first interface is suspended 1845 * resume only when the last interface is resumed 1846 */ 1847 1848 int usbnet_suspend (struct usb_interface *intf, pm_message_t message) 1849 { 1850 struct usbnet *dev = usb_get_intfdata(intf); 1851 1852 if (!dev->suspend_count++) { 1853 spin_lock_irq(&dev->txq.lock); 1854 /* don't autosuspend while transmitting */ 1855 if (dev->txq.qlen && PMSG_IS_AUTO(message)) { 1856 dev->suspend_count--; 1857 spin_unlock_irq(&dev->txq.lock); 1858 return -EBUSY; 1859 } else { 1860 set_bit(EVENT_DEV_ASLEEP, &dev->flags); 1861 spin_unlock_irq(&dev->txq.lock); 1862 } 1863 /* 1864 * accelerate emptying of the rx and queues, to avoid 1865 * having everything error out. 1866 */ 1867 netif_device_detach (dev->net); 1868 usbnet_terminate_urbs(dev); 1869 __usbnet_status_stop_force(dev); 1870 1871 /* 1872 * reattach so runtime management can use and 1873 * wake the device 1874 */ 1875 netif_device_attach (dev->net); 1876 } 1877 return 0; 1878 } 1879 EXPORT_SYMBOL_GPL(usbnet_suspend); 1880 1881 int usbnet_resume (struct usb_interface *intf) 1882 { 1883 struct usbnet *dev = usb_get_intfdata(intf); 1884 struct sk_buff *skb; 1885 struct urb *res; 1886 int retval; 1887 1888 if (!--dev->suspend_count) { 1889 /* resume interrupt URB if it was previously submitted */ 1890 __usbnet_status_start_force(dev, GFP_NOIO); 1891 1892 spin_lock_irq(&dev->txq.lock); 1893 while ((res = usb_get_from_anchor(&dev->deferred))) { 1894 1895 skb = (struct sk_buff *)res->context; 1896 retval = usb_submit_urb(res, GFP_ATOMIC); 1897 if (retval < 0) { 1898 dev_kfree_skb_any(skb); 1899 kfree(res->sg); 1900 usb_free_urb(res); 1901 usb_autopm_put_interface_async(dev->intf); 1902 } else { 1903 netif_trans_update(dev->net); 1904 __skb_queue_tail(&dev->txq, skb); 1905 } 1906 } 1907 1908 smp_mb(); 1909 clear_bit(EVENT_DEV_ASLEEP, &dev->flags); 1910 spin_unlock_irq(&dev->txq.lock); 1911 1912 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) { 1913 /* handle remote wakeup ASAP 1914 * we cannot race against stop 1915 */ 1916 if (netif_device_present(dev->net) && 1917 !timer_pending(&dev->delay) && 1918 !test_bit(EVENT_RX_HALT, &dev->flags)) 1919 rx_alloc_submit(dev, GFP_NOIO); 1920 1921 if (!(dev->txq.qlen >= TX_QLEN(dev))) 1922 netif_tx_wake_all_queues(dev->net); 1923 tasklet_schedule (&dev->bh); 1924 } 1925 } 1926 1927 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) 1928 usb_autopm_get_interface_no_resume(intf); 1929 1930 return 0; 1931 } 1932 EXPORT_SYMBOL_GPL(usbnet_resume); 1933 1934 /* 1935 * Either a subdriver implements manage_power, then it is assumed to always 1936 * be ready to be suspended or it reports the readiness to be suspended 1937 * explicitly 1938 */ 1939 void usbnet_device_suggests_idle(struct usbnet *dev) 1940 { 1941 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) { 1942 dev->intf->needs_remote_wakeup = 1; 1943 usb_autopm_put_interface_async(dev->intf); 1944 } 1945 } 1946 EXPORT_SYMBOL(usbnet_device_suggests_idle); 1947 1948 /* 1949 * For devices that can do without special commands 1950 */ 1951 int usbnet_manage_power(struct usbnet *dev, int on) 1952 { 1953 dev->intf->needs_remote_wakeup = on; 1954 return 0; 1955 } 1956 EXPORT_SYMBOL(usbnet_manage_power); 1957 1958 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset) 1959 { 1960 /* update link after link is reseted */ 1961 if (link && !need_reset) 1962 netif_carrier_on(dev->net); 1963 else 1964 netif_carrier_off(dev->net); 1965 1966 if (need_reset && link) 1967 usbnet_defer_kevent(dev, EVENT_LINK_RESET); 1968 else 1969 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE); 1970 } 1971 EXPORT_SYMBOL(usbnet_link_change); 1972 1973 /*-------------------------------------------------------------------------*/ 1974 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1975 u16 value, u16 index, void *data, u16 size) 1976 { 1977 void *buf = NULL; 1978 int err = -ENOMEM; 1979 1980 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x" 1981 " value=0x%04x index=0x%04x size=%d\n", 1982 cmd, reqtype, value, index, size); 1983 1984 if (size) { 1985 buf = kmalloc(size, GFP_KERNEL); 1986 if (!buf) 1987 goto out; 1988 } 1989 1990 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), 1991 cmd, reqtype, value, index, buf, size, 1992 USB_CTRL_GET_TIMEOUT); 1993 if (err > 0 && err <= size) { 1994 if (data) 1995 memcpy(data, buf, err); 1996 else 1997 netdev_dbg(dev->net, 1998 "Huh? Data requested but thrown away.\n"); 1999 } 2000 kfree(buf); 2001 out: 2002 return err; 2003 } 2004 2005 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 2006 u16 value, u16 index, const void *data, 2007 u16 size) 2008 { 2009 void *buf = NULL; 2010 int err = -ENOMEM; 2011 2012 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 2013 " value=0x%04x index=0x%04x size=%d\n", 2014 cmd, reqtype, value, index, size); 2015 2016 if (data) { 2017 buf = kmemdup(data, size, GFP_KERNEL); 2018 if (!buf) 2019 goto out; 2020 } else { 2021 if (size) { 2022 WARN_ON_ONCE(1); 2023 err = -EINVAL; 2024 goto out; 2025 } 2026 } 2027 2028 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), 2029 cmd, reqtype, value, index, buf, size, 2030 USB_CTRL_SET_TIMEOUT); 2031 kfree(buf); 2032 2033 out: 2034 return err; 2035 } 2036 2037 /* 2038 * The function can't be called inside suspend/resume callback, 2039 * otherwise deadlock will be caused. 2040 */ 2041 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 2042 u16 value, u16 index, void *data, u16 size) 2043 { 2044 int ret; 2045 2046 if (usb_autopm_get_interface(dev->intf) < 0) 2047 return -ENODEV; 2048 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index, 2049 data, size); 2050 usb_autopm_put_interface(dev->intf); 2051 return ret; 2052 } 2053 EXPORT_SYMBOL_GPL(usbnet_read_cmd); 2054 2055 /* 2056 * The function can't be called inside suspend/resume callback, 2057 * otherwise deadlock will be caused. 2058 */ 2059 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 2060 u16 value, u16 index, const void *data, u16 size) 2061 { 2062 int ret; 2063 2064 if (usb_autopm_get_interface(dev->intf) < 0) 2065 return -ENODEV; 2066 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index, 2067 data, size); 2068 usb_autopm_put_interface(dev->intf); 2069 return ret; 2070 } 2071 EXPORT_SYMBOL_GPL(usbnet_write_cmd); 2072 2073 /* 2074 * The function can be called inside suspend/resume callback safely 2075 * and should only be called by suspend/resume callback generally. 2076 */ 2077 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 2078 u16 value, u16 index, void *data, u16 size) 2079 { 2080 return __usbnet_read_cmd(dev, cmd, reqtype, value, index, 2081 data, size); 2082 } 2083 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm); 2084 2085 /* 2086 * The function can be called inside suspend/resume callback safely 2087 * and should only be called by suspend/resume callback generally. 2088 */ 2089 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 2090 u16 value, u16 index, const void *data, 2091 u16 size) 2092 { 2093 return __usbnet_write_cmd(dev, cmd, reqtype, value, index, 2094 data, size); 2095 } 2096 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm); 2097 2098 static void usbnet_async_cmd_cb(struct urb *urb) 2099 { 2100 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context; 2101 int status = urb->status; 2102 2103 if (status < 0) 2104 dev_dbg(&urb->dev->dev, "%s failed with %d", 2105 __func__, status); 2106 2107 kfree(req); 2108 usb_free_urb(urb); 2109 } 2110 2111 /* 2112 * The caller must make sure that device can't be put into suspend 2113 * state until the control URB completes. 2114 */ 2115 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype, 2116 u16 value, u16 index, const void *data, u16 size) 2117 { 2118 struct usb_ctrlrequest *req = NULL; 2119 struct urb *urb; 2120 int err = -ENOMEM; 2121 void *buf = NULL; 2122 2123 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 2124 " value=0x%04x index=0x%04x size=%d\n", 2125 cmd, reqtype, value, index, size); 2126 2127 urb = usb_alloc_urb(0, GFP_ATOMIC); 2128 if (!urb) 2129 goto fail; 2130 2131 if (data) { 2132 buf = kmemdup(data, size, GFP_ATOMIC); 2133 if (!buf) { 2134 netdev_err(dev->net, "Error allocating buffer" 2135 " in %s!\n", __func__); 2136 goto fail_free; 2137 } 2138 } 2139 2140 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC); 2141 if (!req) 2142 goto fail_free_buf; 2143 2144 req->bRequestType = reqtype; 2145 req->bRequest = cmd; 2146 req->wValue = cpu_to_le16(value); 2147 req->wIndex = cpu_to_le16(index); 2148 req->wLength = cpu_to_le16(size); 2149 2150 usb_fill_control_urb(urb, dev->udev, 2151 usb_sndctrlpipe(dev->udev, 0), 2152 (void *)req, buf, size, 2153 usbnet_async_cmd_cb, req); 2154 urb->transfer_flags |= URB_FREE_BUFFER; 2155 2156 err = usb_submit_urb(urb, GFP_ATOMIC); 2157 if (err < 0) { 2158 netdev_err(dev->net, "Error submitting the control" 2159 " message: status=%d\n", err); 2160 goto fail_free; 2161 } 2162 return 0; 2163 2164 fail_free_buf: 2165 kfree(buf); 2166 fail_free: 2167 kfree(req); 2168 usb_free_urb(urb); 2169 fail: 2170 return err; 2171 2172 } 2173 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async); 2174 /*-------------------------------------------------------------------------*/ 2175 2176 static int __init usbnet_init(void) 2177 { 2178 /* Compiler should optimize this out. */ 2179 BUILD_BUG_ON( 2180 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data)); 2181 2182 eth_random_addr(node_id); 2183 return 0; 2184 } 2185 module_init(usbnet_init); 2186 2187 static void __exit usbnet_exit(void) 2188 { 2189 } 2190 module_exit(usbnet_exit); 2191 2192 MODULE_AUTHOR("David Brownell"); 2193 MODULE_DESCRIPTION("USB network driver framework"); 2194 MODULE_LICENSE("GPL"); 2195