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 /*-------------------------------------------------------------------------*/ 38 39 /* 40 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max. 41 * Several dozen bytes of IPv4 data can fit in two such transactions. 42 * One maximum size Ethernet packet takes twenty four of them. 43 * For high speed, each frame comfortably fits almost 36 max size 44 * Ethernet packets (so queues should be bigger). 45 * 46 * The goal is to let the USB host controller be busy for 5msec or 47 * more before an irq is required, under load. Jumbograms change 48 * the equation. 49 */ 50 #define MAX_QUEUE_MEMORY (60 * 1518) 51 #define RX_QLEN(dev) ((dev)->rx_qlen) 52 #define TX_QLEN(dev) ((dev)->tx_qlen) 53 54 // reawaken network queue this soon after stopping; else watchdog barks 55 #define TX_TIMEOUT_JIFFIES (5*HZ) 56 57 /* throttle rx/tx briefly after some faults, so hub_wq might disconnect() 58 * us (it polls at HZ/4 usually) before we report too many false errors. 59 */ 60 #define THROTTLE_JIFFIES (HZ/8) 61 62 // between wakeups 63 #define UNLINK_TIMEOUT_MS 3 64 65 /*-------------------------------------------------------------------------*/ 66 67 // randomly generated ethernet address 68 static u8 node_id [ETH_ALEN]; 69 70 /* use ethtool to change the level for any given device */ 71 static int msg_level = -1; 72 module_param (msg_level, int, 0); 73 MODULE_PARM_DESC (msg_level, "Override default message level"); 74 75 /*-------------------------------------------------------------------------*/ 76 77 static const char * const usbnet_event_names[] = { 78 [EVENT_TX_HALT] = "EVENT_TX_HALT", 79 [EVENT_RX_HALT] = "EVENT_RX_HALT", 80 [EVENT_RX_MEMORY] = "EVENT_RX_MEMORY", 81 [EVENT_STS_SPLIT] = "EVENT_STS_SPLIT", 82 [EVENT_LINK_RESET] = "EVENT_LINK_RESET", 83 [EVENT_RX_PAUSED] = "EVENT_RX_PAUSED", 84 [EVENT_DEV_ASLEEP] = "EVENT_DEV_ASLEEP", 85 [EVENT_DEV_OPEN] = "EVENT_DEV_OPEN", 86 [EVENT_DEVICE_REPORT_IDLE] = "EVENT_DEVICE_REPORT_IDLE", 87 [EVENT_NO_RUNTIME_PM] = "EVENT_NO_RUNTIME_PM", 88 [EVENT_RX_KILL] = "EVENT_RX_KILL", 89 [EVENT_LINK_CHANGE] = "EVENT_LINK_CHANGE", 90 [EVENT_SET_RX_MODE] = "EVENT_SET_RX_MODE", 91 [EVENT_NO_IP_ALIGN] = "EVENT_NO_IP_ALIGN", 92 }; 93 94 /* handles CDC Ethernet and many other network "bulk data" interfaces */ 95 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf) 96 { 97 int tmp; 98 struct usb_host_interface *alt = NULL; 99 struct usb_host_endpoint *in = NULL, *out = NULL; 100 struct usb_host_endpoint *status = NULL; 101 102 for (tmp = 0; tmp < intf->num_altsetting; tmp++) { 103 unsigned ep; 104 105 in = out = status = NULL; 106 alt = intf->altsetting + tmp; 107 108 /* take the first altsetting with in-bulk + out-bulk; 109 * remember any status endpoint, just in case; 110 * ignore other endpoints and altsettings. 111 */ 112 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) { 113 struct usb_host_endpoint *e; 114 int intr = 0; 115 116 e = alt->endpoint + ep; 117 118 /* ignore endpoints which cannot transfer data */ 119 if (!usb_endpoint_maxp(&e->desc)) 120 continue; 121 122 switch (e->desc.bmAttributes) { 123 case USB_ENDPOINT_XFER_INT: 124 if (!usb_endpoint_dir_in(&e->desc)) 125 continue; 126 intr = 1; 127 fallthrough; 128 case USB_ENDPOINT_XFER_BULK: 129 break; 130 default: 131 continue; 132 } 133 if (usb_endpoint_dir_in(&e->desc)) { 134 if (!intr && !in) 135 in = e; 136 else if (intr && !status) 137 status = e; 138 } else { 139 if (!out) 140 out = e; 141 } 142 } 143 if (in && out) 144 break; 145 } 146 if (!alt || !in || !out) 147 return -EINVAL; 148 149 if (alt->desc.bAlternateSetting != 0 || 150 !(dev->driver_info->flags & FLAG_NO_SETINT)) { 151 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber, 152 alt->desc.bAlternateSetting); 153 if (tmp < 0) 154 return tmp; 155 } 156 157 dev->in = usb_rcvbulkpipe (dev->udev, 158 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 159 dev->out = usb_sndbulkpipe (dev->udev, 160 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 161 dev->status = status; 162 return 0; 163 } 164 EXPORT_SYMBOL_GPL(usbnet_get_endpoints); 165 166 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress) 167 { 168 int tmp = -1, ret; 169 unsigned char buf [13]; 170 171 ret = usb_string(dev->udev, iMACAddress, buf, sizeof buf); 172 if (ret == 12) 173 tmp = hex2bin(dev->net->dev_addr, buf, 6); 174 if (tmp < 0) { 175 dev_dbg(&dev->udev->dev, 176 "bad MAC string %d fetch, %d\n", iMACAddress, tmp); 177 if (ret >= 0) 178 ret = -EINVAL; 179 return ret; 180 } 181 return 0; 182 } 183 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr); 184 185 static void intr_complete (struct urb *urb) 186 { 187 struct usbnet *dev = urb->context; 188 int status = urb->status; 189 190 switch (status) { 191 /* success */ 192 case 0: 193 dev->driver_info->status(dev, urb); 194 break; 195 196 /* software-driven interface shutdown */ 197 case -ENOENT: /* urb killed */ 198 case -ESHUTDOWN: /* hardware gone */ 199 netif_dbg(dev, ifdown, dev->net, 200 "intr shutdown, code %d\n", status); 201 return; 202 203 /* NOTE: not throttling like RX/TX, since this endpoint 204 * already polls infrequently 205 */ 206 default: 207 netdev_dbg(dev->net, "intr status %d\n", status); 208 break; 209 } 210 211 status = usb_submit_urb (urb, GFP_ATOMIC); 212 if (status != 0) 213 netif_err(dev, timer, dev->net, 214 "intr resubmit --> %d\n", status); 215 } 216 217 static int init_status (struct usbnet *dev, struct usb_interface *intf) 218 { 219 char *buf = NULL; 220 unsigned pipe = 0; 221 unsigned maxp; 222 unsigned period; 223 224 if (!dev->driver_info->status) 225 return 0; 226 227 pipe = usb_rcvintpipe (dev->udev, 228 dev->status->desc.bEndpointAddress 229 & USB_ENDPOINT_NUMBER_MASK); 230 maxp = usb_maxpacket (dev->udev, pipe, 0); 231 232 /* avoid 1 msec chatter: min 8 msec poll rate */ 233 period = max ((int) dev->status->desc.bInterval, 234 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3); 235 236 buf = kmalloc (maxp, GFP_KERNEL); 237 if (buf) { 238 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL); 239 if (!dev->interrupt) { 240 kfree (buf); 241 return -ENOMEM; 242 } else { 243 usb_fill_int_urb(dev->interrupt, dev->udev, pipe, 244 buf, maxp, intr_complete, dev, period); 245 dev->interrupt->transfer_flags |= URB_FREE_BUFFER; 246 dev_dbg(&intf->dev, 247 "status ep%din, %d bytes period %d\n", 248 usb_pipeendpoint(pipe), maxp, period); 249 } 250 } 251 return 0; 252 } 253 254 /* Submit the interrupt URB if not previously submitted, increasing refcount */ 255 int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags) 256 { 257 int ret = 0; 258 259 WARN_ON_ONCE(dev->interrupt == NULL); 260 if (dev->interrupt) { 261 mutex_lock(&dev->interrupt_mutex); 262 263 if (++dev->interrupt_count == 1) 264 ret = usb_submit_urb(dev->interrupt, mem_flags); 265 266 dev_dbg(&dev->udev->dev, "incremented interrupt URB count to %d\n", 267 dev->interrupt_count); 268 mutex_unlock(&dev->interrupt_mutex); 269 } 270 return ret; 271 } 272 EXPORT_SYMBOL_GPL(usbnet_status_start); 273 274 /* For resume; submit interrupt URB if previously submitted */ 275 static int __usbnet_status_start_force(struct usbnet *dev, gfp_t mem_flags) 276 { 277 int ret = 0; 278 279 mutex_lock(&dev->interrupt_mutex); 280 if (dev->interrupt_count) { 281 ret = usb_submit_urb(dev->interrupt, mem_flags); 282 dev_dbg(&dev->udev->dev, 283 "submitted interrupt URB for resume\n"); 284 } 285 mutex_unlock(&dev->interrupt_mutex); 286 return ret; 287 } 288 289 /* Kill the interrupt URB if all submitters want it killed */ 290 void usbnet_status_stop(struct usbnet *dev) 291 { 292 if (dev->interrupt) { 293 mutex_lock(&dev->interrupt_mutex); 294 WARN_ON(dev->interrupt_count == 0); 295 296 if (dev->interrupt_count && --dev->interrupt_count == 0) 297 usb_kill_urb(dev->interrupt); 298 299 dev_dbg(&dev->udev->dev, 300 "decremented interrupt URB count to %d\n", 301 dev->interrupt_count); 302 mutex_unlock(&dev->interrupt_mutex); 303 } 304 } 305 EXPORT_SYMBOL_GPL(usbnet_status_stop); 306 307 /* For suspend; always kill interrupt URB */ 308 static void __usbnet_status_stop_force(struct usbnet *dev) 309 { 310 if (dev->interrupt) { 311 mutex_lock(&dev->interrupt_mutex); 312 usb_kill_urb(dev->interrupt); 313 dev_dbg(&dev->udev->dev, "killed interrupt URB for suspend\n"); 314 mutex_unlock(&dev->interrupt_mutex); 315 } 316 } 317 318 /* Passes this packet up the stack, updating its accounting. 319 * Some link protocols batch packets, so their rx_fixup paths 320 * can return clones as well as just modify the original skb. 321 */ 322 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb) 323 { 324 struct pcpu_sw_netstats *stats64 = this_cpu_ptr(dev->net->tstats); 325 unsigned long flags; 326 int status; 327 328 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) { 329 skb_queue_tail(&dev->rxq_pause, skb); 330 return; 331 } 332 333 /* only update if unset to allow minidriver rx_fixup override */ 334 if (skb->protocol == 0) 335 skb->protocol = eth_type_trans (skb, dev->net); 336 337 flags = u64_stats_update_begin_irqsave(&stats64->syncp); 338 stats64->rx_packets++; 339 stats64->rx_bytes += skb->len; 340 u64_stats_update_end_irqrestore(&stats64->syncp, flags); 341 342 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n", 343 skb->len + sizeof (struct ethhdr), skb->protocol); 344 memset (skb->cb, 0, sizeof (struct skb_data)); 345 346 if (skb_defer_rx_timestamp(skb)) 347 return; 348 349 status = netif_rx (skb); 350 if (status != NET_RX_SUCCESS) 351 netif_dbg(dev, rx_err, dev->net, 352 "netif_rx status %d\n", status); 353 } 354 EXPORT_SYMBOL_GPL(usbnet_skb_return); 355 356 /* must be called if hard_mtu or rx_urb_size changed */ 357 void usbnet_update_max_qlen(struct usbnet *dev) 358 { 359 enum usb_device_speed speed = dev->udev->speed; 360 361 if (!dev->rx_urb_size || !dev->hard_mtu) 362 goto insanity; 363 switch (speed) { 364 case USB_SPEED_HIGH: 365 dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size; 366 dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu; 367 break; 368 case USB_SPEED_SUPER: 369 case USB_SPEED_SUPER_PLUS: 370 /* 371 * Not take default 5ms qlen for super speed HC to 372 * save memory, and iperf tests show 2.5ms qlen can 373 * work well 374 */ 375 dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size; 376 dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu; 377 break; 378 default: 379 insanity: 380 dev->rx_qlen = dev->tx_qlen = 4; 381 } 382 } 383 EXPORT_SYMBOL_GPL(usbnet_update_max_qlen); 384 385 386 /*------------------------------------------------------------------------- 387 * 388 * Network Device Driver (peer link to "Host Device", from USB host) 389 * 390 *-------------------------------------------------------------------------*/ 391 392 int usbnet_change_mtu (struct net_device *net, int new_mtu) 393 { 394 struct usbnet *dev = netdev_priv(net); 395 int ll_mtu = new_mtu + net->hard_header_len; 396 int old_hard_mtu = dev->hard_mtu; 397 int old_rx_urb_size = dev->rx_urb_size; 398 399 // no second zero-length packet read wanted after mtu-sized packets 400 if ((ll_mtu % dev->maxpacket) == 0) 401 return -EDOM; 402 net->mtu = new_mtu; 403 404 dev->hard_mtu = net->mtu + net->hard_header_len; 405 if (dev->rx_urb_size == old_hard_mtu) { 406 dev->rx_urb_size = dev->hard_mtu; 407 if (dev->rx_urb_size > old_rx_urb_size) { 408 usbnet_pause_rx(dev); 409 usbnet_unlink_rx_urbs(dev); 410 usbnet_resume_rx(dev); 411 } 412 } 413 414 /* max qlen depend on hard_mtu and rx_urb_size */ 415 usbnet_update_max_qlen(dev); 416 417 return 0; 418 } 419 EXPORT_SYMBOL_GPL(usbnet_change_mtu); 420 421 /* The caller must hold list->lock */ 422 static void __usbnet_queue_skb(struct sk_buff_head *list, 423 struct sk_buff *newsk, enum skb_state state) 424 { 425 struct skb_data *entry = (struct skb_data *) newsk->cb; 426 427 __skb_queue_tail(list, newsk); 428 entry->state = state; 429 } 430 431 /*-------------------------------------------------------------------------*/ 432 433 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from 434 * completion callbacks. 2.5 should have fixed those bugs... 435 */ 436 437 static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb, 438 struct sk_buff_head *list, enum skb_state state) 439 { 440 unsigned long flags; 441 enum skb_state old_state; 442 struct skb_data *entry = (struct skb_data *) skb->cb; 443 444 spin_lock_irqsave(&list->lock, flags); 445 old_state = entry->state; 446 entry->state = state; 447 __skb_unlink(skb, list); 448 449 /* defer_bh() is never called with list == &dev->done. 450 * spin_lock_nested() tells lockdep that it is OK to take 451 * dev->done.lock here with list->lock held. 452 */ 453 spin_lock_nested(&dev->done.lock, SINGLE_DEPTH_NESTING); 454 455 __skb_queue_tail(&dev->done, skb); 456 if (dev->done.qlen == 1) 457 tasklet_schedule(&dev->bh); 458 spin_unlock(&dev->done.lock); 459 spin_unlock_irqrestore(&list->lock, flags); 460 return old_state; 461 } 462 463 /* some work can't be done in tasklets, so we use keventd 464 * 465 * NOTE: annoying asymmetry: if it's active, schedule_work() fails, 466 * but tasklet_schedule() doesn't. hope the failure is rare. 467 */ 468 void usbnet_defer_kevent (struct usbnet *dev, int work) 469 { 470 set_bit (work, &dev->flags); 471 if (!schedule_work (&dev->kevent)) 472 netdev_dbg(dev->net, "kevent %s may have been dropped\n", usbnet_event_names[work]); 473 else 474 netdev_dbg(dev->net, "kevent %s scheduled\n", usbnet_event_names[work]); 475 } 476 EXPORT_SYMBOL_GPL(usbnet_defer_kevent); 477 478 /*-------------------------------------------------------------------------*/ 479 480 static void rx_complete (struct urb *urb); 481 482 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) 483 { 484 struct sk_buff *skb; 485 struct skb_data *entry; 486 int retval = 0; 487 unsigned long lockflags; 488 size_t size = dev->rx_urb_size; 489 490 /* prevent rx skb allocation when error ratio is high */ 491 if (test_bit(EVENT_RX_KILL, &dev->flags)) { 492 usb_free_urb(urb); 493 return -ENOLINK; 494 } 495 496 if (test_bit(EVENT_NO_IP_ALIGN, &dev->flags)) 497 skb = __netdev_alloc_skb(dev->net, size, flags); 498 else 499 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags); 500 if (!skb) { 501 netif_dbg(dev, rx_err, dev->net, "no rx skb\n"); 502 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 503 usb_free_urb (urb); 504 return -ENOMEM; 505 } 506 507 entry = (struct skb_data *) skb->cb; 508 entry->urb = urb; 509 entry->dev = dev; 510 entry->length = 0; 511 512 usb_fill_bulk_urb (urb, dev->udev, dev->in, 513 skb->data, size, rx_complete, skb); 514 515 spin_lock_irqsave (&dev->rxq.lock, lockflags); 516 517 if (netif_running (dev->net) && 518 netif_device_present (dev->net) && 519 test_bit(EVENT_DEV_OPEN, &dev->flags) && 520 !test_bit (EVENT_RX_HALT, &dev->flags) && 521 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) { 522 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) { 523 case -EPIPE: 524 usbnet_defer_kevent (dev, EVENT_RX_HALT); 525 break; 526 case -ENOMEM: 527 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 528 break; 529 case -ENODEV: 530 netif_dbg(dev, ifdown, dev->net, "device gone\n"); 531 netif_device_detach (dev->net); 532 break; 533 case -EHOSTUNREACH: 534 retval = -ENOLINK; 535 break; 536 default: 537 netif_dbg(dev, rx_err, dev->net, 538 "rx submit, %d\n", retval); 539 tasklet_schedule (&dev->bh); 540 break; 541 case 0: 542 __usbnet_queue_skb(&dev->rxq, skb, rx_start); 543 } 544 } else { 545 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n"); 546 retval = -ENOLINK; 547 } 548 spin_unlock_irqrestore (&dev->rxq.lock, lockflags); 549 if (retval) { 550 dev_kfree_skb_any (skb); 551 usb_free_urb (urb); 552 } 553 return retval; 554 } 555 556 557 /*-------------------------------------------------------------------------*/ 558 559 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb) 560 { 561 if (dev->driver_info->rx_fixup && 562 !dev->driver_info->rx_fixup (dev, skb)) { 563 /* With RX_ASSEMBLE, rx_fixup() must update counters */ 564 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE)) 565 dev->net->stats.rx_errors++; 566 goto done; 567 } 568 // else network stack removes extra byte if we forced a short packet 569 570 /* all data was already cloned from skb inside the driver */ 571 if (dev->driver_info->flags & FLAG_MULTI_PACKET) 572 goto done; 573 574 if (skb->len < ETH_HLEN) { 575 dev->net->stats.rx_errors++; 576 dev->net->stats.rx_length_errors++; 577 netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len); 578 } else { 579 usbnet_skb_return(dev, skb); 580 return; 581 } 582 583 done: 584 skb_queue_tail(&dev->done, skb); 585 } 586 587 /*-------------------------------------------------------------------------*/ 588 589 static void rx_complete (struct urb *urb) 590 { 591 struct sk_buff *skb = (struct sk_buff *) urb->context; 592 struct skb_data *entry = (struct skb_data *) skb->cb; 593 struct usbnet *dev = entry->dev; 594 int urb_status = urb->status; 595 enum skb_state state; 596 597 skb_put (skb, urb->actual_length); 598 state = rx_done; 599 entry->urb = NULL; 600 601 switch (urb_status) { 602 /* success */ 603 case 0: 604 break; 605 606 /* stalls need manual reset. this is rare ... except that 607 * when going through USB 2.0 TTs, unplug appears this way. 608 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ 609 * storm, recovering as needed. 610 */ 611 case -EPIPE: 612 dev->net->stats.rx_errors++; 613 usbnet_defer_kevent (dev, EVENT_RX_HALT); 614 fallthrough; 615 616 /* software-driven interface shutdown */ 617 case -ECONNRESET: /* async unlink */ 618 case -ESHUTDOWN: /* hardware gone */ 619 netif_dbg(dev, ifdown, dev->net, 620 "rx shutdown, code %d\n", urb_status); 621 goto block; 622 623 /* we get controller i/o faults during hub_wq disconnect() delays. 624 * throttle down resubmits, to avoid log floods; just temporarily, 625 * so we still recover when the fault isn't a hub_wq delay. 626 */ 627 case -EPROTO: 628 case -ETIME: 629 case -EILSEQ: 630 dev->net->stats.rx_errors++; 631 if (!timer_pending (&dev->delay)) { 632 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); 633 netif_dbg(dev, link, dev->net, 634 "rx throttle %d\n", urb_status); 635 } 636 block: 637 state = rx_cleanup; 638 entry->urb = urb; 639 urb = NULL; 640 break; 641 642 /* data overrun ... flush fifo? */ 643 case -EOVERFLOW: 644 dev->net->stats.rx_over_errors++; 645 fallthrough; 646 647 default: 648 state = rx_cleanup; 649 dev->net->stats.rx_errors++; 650 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status); 651 break; 652 } 653 654 /* stop rx if packet error rate is high */ 655 if (++dev->pkt_cnt > 30) { 656 dev->pkt_cnt = 0; 657 dev->pkt_err = 0; 658 } else { 659 if (state == rx_cleanup) 660 dev->pkt_err++; 661 if (dev->pkt_err > 20) 662 set_bit(EVENT_RX_KILL, &dev->flags); 663 } 664 665 state = defer_bh(dev, skb, &dev->rxq, state); 666 667 if (urb) { 668 if (netif_running (dev->net) && 669 !test_bit (EVENT_RX_HALT, &dev->flags) && 670 state != unlink_start) { 671 rx_submit (dev, urb, GFP_ATOMIC); 672 usb_mark_last_busy(dev->udev); 673 return; 674 } 675 usb_free_urb (urb); 676 } 677 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n"); 678 } 679 680 /*-------------------------------------------------------------------------*/ 681 void usbnet_pause_rx(struct usbnet *dev) 682 { 683 set_bit(EVENT_RX_PAUSED, &dev->flags); 684 685 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n"); 686 } 687 EXPORT_SYMBOL_GPL(usbnet_pause_rx); 688 689 void usbnet_resume_rx(struct usbnet *dev) 690 { 691 struct sk_buff *skb; 692 int num = 0; 693 694 clear_bit(EVENT_RX_PAUSED, &dev->flags); 695 696 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) { 697 usbnet_skb_return(dev, skb); 698 num++; 699 } 700 701 tasklet_schedule(&dev->bh); 702 703 netif_dbg(dev, rx_status, dev->net, 704 "paused rx queue disabled, %d skbs requeued\n", num); 705 } 706 EXPORT_SYMBOL_GPL(usbnet_resume_rx); 707 708 void usbnet_purge_paused_rxq(struct usbnet *dev) 709 { 710 skb_queue_purge(&dev->rxq_pause); 711 } 712 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq); 713 714 /*-------------------------------------------------------------------------*/ 715 716 // unlink pending rx/tx; completion handlers do all other cleanup 717 718 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) 719 { 720 unsigned long flags; 721 struct sk_buff *skb; 722 int count = 0; 723 724 spin_lock_irqsave (&q->lock, flags); 725 while (!skb_queue_empty(q)) { 726 struct skb_data *entry; 727 struct urb *urb; 728 int retval; 729 730 skb_queue_walk(q, skb) { 731 entry = (struct skb_data *) skb->cb; 732 if (entry->state != unlink_start) 733 goto found; 734 } 735 break; 736 found: 737 entry->state = unlink_start; 738 urb = entry->urb; 739 740 /* 741 * Get reference count of the URB to avoid it to be 742 * freed during usb_unlink_urb, which may trigger 743 * use-after-free problem inside usb_unlink_urb since 744 * usb_unlink_urb is always racing with .complete 745 * handler(include defer_bh). 746 */ 747 usb_get_urb(urb); 748 spin_unlock_irqrestore(&q->lock, flags); 749 // during some PM-driven resume scenarios, 750 // these (async) unlinks complete immediately 751 retval = usb_unlink_urb (urb); 752 if (retval != -EINPROGRESS && retval != 0) 753 netdev_dbg(dev->net, "unlink urb err, %d\n", retval); 754 else 755 count++; 756 usb_put_urb(urb); 757 spin_lock_irqsave(&q->lock, flags); 758 } 759 spin_unlock_irqrestore (&q->lock, flags); 760 return count; 761 } 762 763 // Flush all pending rx urbs 764 // minidrivers may need to do this when the MTU changes 765 766 void usbnet_unlink_rx_urbs(struct usbnet *dev) 767 { 768 if (netif_running(dev->net)) { 769 (void) unlink_urbs (dev, &dev->rxq); 770 tasklet_schedule(&dev->bh); 771 } 772 } 773 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); 774 775 /*-------------------------------------------------------------------------*/ 776 777 static void wait_skb_queue_empty(struct sk_buff_head *q) 778 { 779 unsigned long flags; 780 781 spin_lock_irqsave(&q->lock, flags); 782 while (!skb_queue_empty(q)) { 783 spin_unlock_irqrestore(&q->lock, flags); 784 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS)); 785 set_current_state(TASK_UNINTERRUPTIBLE); 786 spin_lock_irqsave(&q->lock, flags); 787 } 788 spin_unlock_irqrestore(&q->lock, flags); 789 } 790 791 // precondition: never called in_interrupt 792 static void usbnet_terminate_urbs(struct usbnet *dev) 793 { 794 DECLARE_WAITQUEUE(wait, current); 795 int temp; 796 797 /* ensure there are no more active urbs */ 798 add_wait_queue(&dev->wait, &wait); 799 set_current_state(TASK_UNINTERRUPTIBLE); 800 temp = unlink_urbs(dev, &dev->txq) + 801 unlink_urbs(dev, &dev->rxq); 802 803 /* maybe wait for deletions to finish. */ 804 wait_skb_queue_empty(&dev->rxq); 805 wait_skb_queue_empty(&dev->txq); 806 wait_skb_queue_empty(&dev->done); 807 netif_dbg(dev, ifdown, dev->net, 808 "waited for %d urb completions\n", temp); 809 set_current_state(TASK_RUNNING); 810 remove_wait_queue(&dev->wait, &wait); 811 } 812 813 int usbnet_stop (struct net_device *net) 814 { 815 struct usbnet *dev = netdev_priv(net); 816 const struct driver_info *info = dev->driver_info; 817 int retval, pm, mpn; 818 819 clear_bit(EVENT_DEV_OPEN, &dev->flags); 820 netif_stop_queue (net); 821 822 netif_info(dev, ifdown, dev->net, 823 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n", 824 net->stats.rx_packets, net->stats.tx_packets, 825 net->stats.rx_errors, net->stats.tx_errors); 826 827 /* to not race resume */ 828 pm = usb_autopm_get_interface(dev->intf); 829 /* allow minidriver to stop correctly (wireless devices to turn off 830 * radio etc) */ 831 if (info->stop) { 832 retval = info->stop(dev); 833 if (retval < 0) 834 netif_info(dev, ifdown, dev->net, 835 "stop fail (%d) usbnet usb-%s-%s, %s\n", 836 retval, 837 dev->udev->bus->bus_name, dev->udev->devpath, 838 info->description); 839 } 840 841 if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) 842 usbnet_terminate_urbs(dev); 843 844 usbnet_status_stop(dev); 845 846 usbnet_purge_paused_rxq(dev); 847 848 mpn = !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags); 849 850 /* deferred work (task, timer, softirq) must also stop. 851 * can't flush_scheduled_work() until we drop rtnl (later), 852 * else workers could deadlock; so make workers a NOP. 853 */ 854 dev->flags = 0; 855 del_timer_sync (&dev->delay); 856 tasklet_kill (&dev->bh); 857 if (!pm) 858 usb_autopm_put_interface(dev->intf); 859 860 if (info->manage_power && mpn) 861 info->manage_power(dev, 0); 862 else 863 usb_autopm_put_interface(dev->intf); 864 865 return 0; 866 } 867 EXPORT_SYMBOL_GPL(usbnet_stop); 868 869 /*-------------------------------------------------------------------------*/ 870 871 // posts reads, and enables write queuing 872 873 // precondition: never called in_interrupt 874 875 int usbnet_open (struct net_device *net) 876 { 877 struct usbnet *dev = netdev_priv(net); 878 int retval; 879 const struct driver_info *info = dev->driver_info; 880 881 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { 882 netif_info(dev, ifup, dev->net, 883 "resumption fail (%d) usbnet usb-%s-%s, %s\n", 884 retval, 885 dev->udev->bus->bus_name, 886 dev->udev->devpath, 887 info->description); 888 goto done_nopm; 889 } 890 891 // put into "known safe" state 892 if (info->reset && (retval = info->reset (dev)) < 0) { 893 netif_info(dev, ifup, dev->net, 894 "open reset fail (%d) usbnet usb-%s-%s, %s\n", 895 retval, 896 dev->udev->bus->bus_name, 897 dev->udev->devpath, 898 info->description); 899 goto done; 900 } 901 902 /* hard_mtu or rx_urb_size may change in reset() */ 903 usbnet_update_max_qlen(dev); 904 905 // insist peer be connected 906 if (info->check_connect && (retval = info->check_connect (dev)) < 0) { 907 netif_err(dev, ifup, dev->net, "can't open; %d\n", retval); 908 goto done; 909 } 910 911 /* start any status interrupt transfer */ 912 if (dev->interrupt) { 913 retval = usbnet_status_start(dev, GFP_KERNEL); 914 if (retval < 0) { 915 netif_err(dev, ifup, dev->net, 916 "intr submit %d\n", retval); 917 goto done; 918 } 919 } 920 921 set_bit(EVENT_DEV_OPEN, &dev->flags); 922 netif_start_queue (net); 923 netif_info(dev, ifup, dev->net, 924 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n", 925 (int)RX_QLEN(dev), (int)TX_QLEN(dev), 926 dev->net->mtu, 927 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" : 928 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" : 929 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" : 930 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" : 931 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" : 932 "simple"); 933 934 /* reset rx error state */ 935 dev->pkt_cnt = 0; 936 dev->pkt_err = 0; 937 clear_bit(EVENT_RX_KILL, &dev->flags); 938 939 // delay posting reads until we're fully open 940 tasklet_schedule (&dev->bh); 941 if (info->manage_power) { 942 retval = info->manage_power(dev, 1); 943 if (retval < 0) { 944 retval = 0; 945 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags); 946 } else { 947 usb_autopm_put_interface(dev->intf); 948 } 949 } 950 return retval; 951 done: 952 usb_autopm_put_interface(dev->intf); 953 done_nopm: 954 return retval; 955 } 956 EXPORT_SYMBOL_GPL(usbnet_open); 957 958 /*-------------------------------------------------------------------------*/ 959 960 /* ethtool methods; minidrivers may need to add some more, but 961 * they'll probably want to use this base set. 962 */ 963 964 /* These methods are written on the assumption that the device 965 * uses MII 966 */ 967 int usbnet_get_link_ksettings_mii(struct net_device *net, 968 struct ethtool_link_ksettings *cmd) 969 { 970 struct usbnet *dev = netdev_priv(net); 971 972 if (!dev->mii.mdio_read) 973 return -EOPNOTSUPP; 974 975 mii_ethtool_get_link_ksettings(&dev->mii, cmd); 976 977 return 0; 978 } 979 EXPORT_SYMBOL_GPL(usbnet_get_link_ksettings_mii); 980 981 int usbnet_get_link_ksettings_internal(struct net_device *net, 982 struct ethtool_link_ksettings *cmd) 983 { 984 struct usbnet *dev = netdev_priv(net); 985 986 /* the assumption that speed is equal on tx and rx 987 * is deeply engrained into the networking layer. 988 * For wireless stuff it is not true. 989 * We assume that rx_speed matters more. 990 */ 991 if (dev->rx_speed != SPEED_UNSET) 992 cmd->base.speed = dev->rx_speed / 1000000; 993 else if (dev->tx_speed != SPEED_UNSET) 994 cmd->base.speed = dev->tx_speed / 1000000; 995 else 996 cmd->base.speed = SPEED_UNKNOWN; 997 998 return 0; 999 } 1000 EXPORT_SYMBOL_GPL(usbnet_get_link_ksettings_internal); 1001 1002 int usbnet_set_link_ksettings_mii(struct net_device *net, 1003 const struct ethtool_link_ksettings *cmd) 1004 { 1005 struct usbnet *dev = netdev_priv(net); 1006 int retval; 1007 1008 if (!dev->mii.mdio_write) 1009 return -EOPNOTSUPP; 1010 1011 retval = mii_ethtool_set_link_ksettings(&dev->mii, cmd); 1012 1013 /* link speed/duplex might have changed */ 1014 if (dev->driver_info->link_reset) 1015 dev->driver_info->link_reset(dev); 1016 1017 /* hard_mtu or rx_urb_size may change in link_reset() */ 1018 usbnet_update_max_qlen(dev); 1019 1020 return retval; 1021 } 1022 EXPORT_SYMBOL_GPL(usbnet_set_link_ksettings_mii); 1023 1024 u32 usbnet_get_link (struct net_device *net) 1025 { 1026 struct usbnet *dev = netdev_priv(net); 1027 1028 /* If a check_connect is defined, return its result */ 1029 if (dev->driver_info->check_connect) 1030 return dev->driver_info->check_connect (dev) == 0; 1031 1032 /* if the device has mii operations, use those */ 1033 if (dev->mii.mdio_read) 1034 return mii_link_ok(&dev->mii); 1035 1036 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ 1037 return ethtool_op_get_link(net); 1038 } 1039 EXPORT_SYMBOL_GPL(usbnet_get_link); 1040 1041 int usbnet_nway_reset(struct net_device *net) 1042 { 1043 struct usbnet *dev = netdev_priv(net); 1044 1045 if (!dev->mii.mdio_write) 1046 return -EOPNOTSUPP; 1047 1048 return mii_nway_restart(&dev->mii); 1049 } 1050 EXPORT_SYMBOL_GPL(usbnet_nway_reset); 1051 1052 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) 1053 { 1054 struct usbnet *dev = netdev_priv(net); 1055 1056 strlcpy (info->driver, dev->driver_name, sizeof info->driver); 1057 strlcpy (info->fw_version, dev->driver_info->description, 1058 sizeof info->fw_version); 1059 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); 1060 } 1061 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); 1062 1063 u32 usbnet_get_msglevel (struct net_device *net) 1064 { 1065 struct usbnet *dev = netdev_priv(net); 1066 1067 return dev->msg_enable; 1068 } 1069 EXPORT_SYMBOL_GPL(usbnet_get_msglevel); 1070 1071 void usbnet_set_msglevel (struct net_device *net, u32 level) 1072 { 1073 struct usbnet *dev = netdev_priv(net); 1074 1075 dev->msg_enable = level; 1076 } 1077 EXPORT_SYMBOL_GPL(usbnet_set_msglevel); 1078 1079 /* drivers may override default ethtool_ops in their bind() routine */ 1080 static const struct ethtool_ops usbnet_ethtool_ops = { 1081 .get_link = usbnet_get_link, 1082 .nway_reset = usbnet_nway_reset, 1083 .get_drvinfo = usbnet_get_drvinfo, 1084 .get_msglevel = usbnet_get_msglevel, 1085 .set_msglevel = usbnet_set_msglevel, 1086 .get_ts_info = ethtool_op_get_ts_info, 1087 .get_link_ksettings = usbnet_get_link_ksettings_mii, 1088 .set_link_ksettings = usbnet_set_link_ksettings_mii, 1089 }; 1090 1091 /*-------------------------------------------------------------------------*/ 1092 1093 static void __handle_link_change(struct usbnet *dev) 1094 { 1095 if (!test_bit(EVENT_DEV_OPEN, &dev->flags)) 1096 return; 1097 1098 if (!netif_carrier_ok(dev->net)) { 1099 /* kill URBs for reading packets to save bus bandwidth */ 1100 unlink_urbs(dev, &dev->rxq); 1101 1102 /* 1103 * tx_timeout will unlink URBs for sending packets and 1104 * tx queue is stopped by netcore after link becomes off 1105 */ 1106 } else { 1107 /* submitting URBs for reading packets */ 1108 tasklet_schedule(&dev->bh); 1109 } 1110 1111 /* hard_mtu or rx_urb_size may change during link change */ 1112 usbnet_update_max_qlen(dev); 1113 1114 clear_bit(EVENT_LINK_CHANGE, &dev->flags); 1115 } 1116 1117 void usbnet_set_rx_mode(struct net_device *net) 1118 { 1119 struct usbnet *dev = netdev_priv(net); 1120 1121 usbnet_defer_kevent(dev, EVENT_SET_RX_MODE); 1122 } 1123 EXPORT_SYMBOL_GPL(usbnet_set_rx_mode); 1124 1125 static void __handle_set_rx_mode(struct usbnet *dev) 1126 { 1127 if (dev->driver_info->set_rx_mode) 1128 (dev->driver_info->set_rx_mode)(dev); 1129 1130 clear_bit(EVENT_SET_RX_MODE, &dev->flags); 1131 } 1132 1133 /* work that cannot be done in interrupt context uses keventd. 1134 * 1135 * NOTE: with 2.5 we could do more of this using completion callbacks, 1136 * especially now that control transfers can be queued. 1137 */ 1138 static void 1139 usbnet_deferred_kevent (struct work_struct *work) 1140 { 1141 struct usbnet *dev = 1142 container_of(work, struct usbnet, kevent); 1143 int status; 1144 1145 /* usb_clear_halt() needs a thread context */ 1146 if (test_bit (EVENT_TX_HALT, &dev->flags)) { 1147 unlink_urbs (dev, &dev->txq); 1148 status = usb_autopm_get_interface(dev->intf); 1149 if (status < 0) 1150 goto fail_pipe; 1151 status = usb_clear_halt (dev->udev, dev->out); 1152 usb_autopm_put_interface(dev->intf); 1153 if (status < 0 && 1154 status != -EPIPE && 1155 status != -ESHUTDOWN) { 1156 if (netif_msg_tx_err (dev)) 1157 fail_pipe: 1158 netdev_err(dev->net, "can't clear tx halt, status %d\n", 1159 status); 1160 } else { 1161 clear_bit (EVENT_TX_HALT, &dev->flags); 1162 if (status != -ESHUTDOWN) 1163 netif_wake_queue (dev->net); 1164 } 1165 } 1166 if (test_bit (EVENT_RX_HALT, &dev->flags)) { 1167 unlink_urbs (dev, &dev->rxq); 1168 status = usb_autopm_get_interface(dev->intf); 1169 if (status < 0) 1170 goto fail_halt; 1171 status = usb_clear_halt (dev->udev, dev->in); 1172 usb_autopm_put_interface(dev->intf); 1173 if (status < 0 && 1174 status != -EPIPE && 1175 status != -ESHUTDOWN) { 1176 if (netif_msg_rx_err (dev)) 1177 fail_halt: 1178 netdev_err(dev->net, "can't clear rx halt, status %d\n", 1179 status); 1180 } else { 1181 clear_bit (EVENT_RX_HALT, &dev->flags); 1182 tasklet_schedule (&dev->bh); 1183 } 1184 } 1185 1186 /* tasklet could resubmit itself forever if memory is tight */ 1187 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { 1188 struct urb *urb = NULL; 1189 int resched = 1; 1190 1191 if (netif_running (dev->net)) 1192 urb = usb_alloc_urb (0, GFP_KERNEL); 1193 else 1194 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1195 if (urb != NULL) { 1196 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1197 status = usb_autopm_get_interface(dev->intf); 1198 if (status < 0) { 1199 usb_free_urb(urb); 1200 goto fail_lowmem; 1201 } 1202 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) 1203 resched = 0; 1204 usb_autopm_put_interface(dev->intf); 1205 fail_lowmem: 1206 if (resched) 1207 tasklet_schedule (&dev->bh); 1208 } 1209 } 1210 1211 if (test_bit (EVENT_LINK_RESET, &dev->flags)) { 1212 const struct driver_info *info = dev->driver_info; 1213 int retval = 0; 1214 1215 clear_bit (EVENT_LINK_RESET, &dev->flags); 1216 status = usb_autopm_get_interface(dev->intf); 1217 if (status < 0) 1218 goto skip_reset; 1219 if(info->link_reset && (retval = info->link_reset(dev)) < 0) { 1220 usb_autopm_put_interface(dev->intf); 1221 skip_reset: 1222 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", 1223 retval, 1224 dev->udev->bus->bus_name, 1225 dev->udev->devpath, 1226 info->description); 1227 } else { 1228 usb_autopm_put_interface(dev->intf); 1229 } 1230 1231 /* handle link change from link resetting */ 1232 __handle_link_change(dev); 1233 } 1234 1235 if (test_bit (EVENT_LINK_CHANGE, &dev->flags)) 1236 __handle_link_change(dev); 1237 1238 if (test_bit (EVENT_SET_RX_MODE, &dev->flags)) 1239 __handle_set_rx_mode(dev); 1240 1241 1242 if (dev->flags) 1243 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); 1244 } 1245 1246 /*-------------------------------------------------------------------------*/ 1247 1248 static void tx_complete (struct urb *urb) 1249 { 1250 struct sk_buff *skb = (struct sk_buff *) urb->context; 1251 struct skb_data *entry = (struct skb_data *) skb->cb; 1252 struct usbnet *dev = entry->dev; 1253 1254 if (urb->status == 0) { 1255 struct pcpu_sw_netstats *stats64 = this_cpu_ptr(dev->net->tstats); 1256 unsigned long flags; 1257 1258 flags = u64_stats_update_begin_irqsave(&stats64->syncp); 1259 stats64->tx_packets += entry->packets; 1260 stats64->tx_bytes += entry->length; 1261 u64_stats_update_end_irqrestore(&stats64->syncp, flags); 1262 } else { 1263 dev->net->stats.tx_errors++; 1264 1265 switch (urb->status) { 1266 case -EPIPE: 1267 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1268 break; 1269 1270 /* software-driven interface shutdown */ 1271 case -ECONNRESET: // async unlink 1272 case -ESHUTDOWN: // hardware gone 1273 break; 1274 1275 /* like rx, tx gets controller i/o faults during hub_wq 1276 * delays and so it uses the same throttling mechanism. 1277 */ 1278 case -EPROTO: 1279 case -ETIME: 1280 case -EILSEQ: 1281 usb_mark_last_busy(dev->udev); 1282 if (!timer_pending (&dev->delay)) { 1283 mod_timer (&dev->delay, 1284 jiffies + THROTTLE_JIFFIES); 1285 netif_dbg(dev, link, dev->net, 1286 "tx throttle %d\n", urb->status); 1287 } 1288 netif_stop_queue (dev->net); 1289 break; 1290 default: 1291 netif_dbg(dev, tx_err, dev->net, 1292 "tx err %d\n", entry->urb->status); 1293 break; 1294 } 1295 } 1296 1297 usb_autopm_put_interface_async(dev->intf); 1298 (void) defer_bh(dev, skb, &dev->txq, tx_done); 1299 } 1300 1301 /*-------------------------------------------------------------------------*/ 1302 1303 void usbnet_tx_timeout (struct net_device *net, unsigned int txqueue) 1304 { 1305 struct usbnet *dev = netdev_priv(net); 1306 1307 unlink_urbs (dev, &dev->txq); 1308 tasklet_schedule (&dev->bh); 1309 /* this needs to be handled individually because the generic layer 1310 * doesn't know what is sufficient and could not restore private 1311 * information if a remedy of an unconditional reset were used. 1312 */ 1313 if (dev->driver_info->recover) 1314 (dev->driver_info->recover)(dev); 1315 } 1316 EXPORT_SYMBOL_GPL(usbnet_tx_timeout); 1317 1318 /*-------------------------------------------------------------------------*/ 1319 1320 static int build_dma_sg(const struct sk_buff *skb, struct urb *urb) 1321 { 1322 unsigned num_sgs, total_len = 0; 1323 int i, s = 0; 1324 1325 num_sgs = skb_shinfo(skb)->nr_frags + 1; 1326 if (num_sgs == 1) 1327 return 0; 1328 1329 /* reserve one for zero packet */ 1330 urb->sg = kmalloc_array(num_sgs + 1, sizeof(struct scatterlist), 1331 GFP_ATOMIC); 1332 if (!urb->sg) 1333 return -ENOMEM; 1334 1335 urb->num_sgs = num_sgs; 1336 sg_init_table(urb->sg, urb->num_sgs + 1); 1337 1338 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb)); 1339 total_len += skb_headlen(skb); 1340 1341 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1342 skb_frag_t *f = &skb_shinfo(skb)->frags[i]; 1343 1344 total_len += skb_frag_size(f); 1345 sg_set_page(&urb->sg[i + s], skb_frag_page(f), skb_frag_size(f), 1346 skb_frag_off(f)); 1347 } 1348 urb->transfer_buffer_length = total_len; 1349 1350 return 1; 1351 } 1352 1353 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, 1354 struct net_device *net) 1355 { 1356 struct usbnet *dev = netdev_priv(net); 1357 unsigned int length; 1358 struct urb *urb = NULL; 1359 struct skb_data *entry; 1360 const struct driver_info *info = dev->driver_info; 1361 unsigned long flags; 1362 int retval; 1363 1364 if (skb) 1365 skb_tx_timestamp(skb); 1366 1367 // some devices want funky USB-level framing, for 1368 // win32 driver (usually) and/or hardware quirks 1369 if (info->tx_fixup) { 1370 skb = info->tx_fixup (dev, skb, GFP_ATOMIC); 1371 if (!skb) { 1372 /* packet collected; minidriver waiting for more */ 1373 if (info->flags & FLAG_MULTI_PACKET) 1374 goto not_drop; 1375 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); 1376 goto drop; 1377 } 1378 } 1379 1380 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { 1381 netif_dbg(dev, tx_err, dev->net, "no urb\n"); 1382 goto drop; 1383 } 1384 1385 entry = (struct skb_data *) skb->cb; 1386 entry->urb = urb; 1387 entry->dev = dev; 1388 1389 usb_fill_bulk_urb (urb, dev->udev, dev->out, 1390 skb->data, skb->len, tx_complete, skb); 1391 if (dev->can_dma_sg) { 1392 if (build_dma_sg(skb, urb) < 0) 1393 goto drop; 1394 } 1395 length = urb->transfer_buffer_length; 1396 1397 /* don't assume the hardware handles USB_ZERO_PACKET 1398 * NOTE: strictly conforming cdc-ether devices should expect 1399 * the ZLP here, but ignore the one-byte packet. 1400 * NOTE2: CDC NCM specification is different from CDC ECM when 1401 * handling ZLP/short packets, so cdc_ncm driver will make short 1402 * packet itself if needed. 1403 */ 1404 if (length % dev->maxpacket == 0) { 1405 if (!(info->flags & FLAG_SEND_ZLP)) { 1406 if (!(info->flags & FLAG_MULTI_PACKET)) { 1407 length++; 1408 if (skb_tailroom(skb) && !urb->num_sgs) { 1409 skb->data[skb->len] = 0; 1410 __skb_put(skb, 1); 1411 } else if (urb->num_sgs) 1412 sg_set_buf(&urb->sg[urb->num_sgs++], 1413 dev->padding_pkt, 1); 1414 } 1415 } else 1416 urb->transfer_flags |= URB_ZERO_PACKET; 1417 } 1418 urb->transfer_buffer_length = length; 1419 1420 if (info->flags & FLAG_MULTI_PACKET) { 1421 /* Driver has set number of packets and a length delta. 1422 * Calculate the complete length and ensure that it's 1423 * positive. 1424 */ 1425 entry->length += length; 1426 if (WARN_ON_ONCE(entry->length <= 0)) 1427 entry->length = length; 1428 } else { 1429 usbnet_set_skb_tx_stats(skb, 1, length); 1430 } 1431 1432 spin_lock_irqsave(&dev->txq.lock, flags); 1433 retval = usb_autopm_get_interface_async(dev->intf); 1434 if (retval < 0) { 1435 spin_unlock_irqrestore(&dev->txq.lock, flags); 1436 goto drop; 1437 } 1438 if (netif_queue_stopped(net)) { 1439 usb_autopm_put_interface_async(dev->intf); 1440 spin_unlock_irqrestore(&dev->txq.lock, flags); 1441 goto drop; 1442 } 1443 1444 #ifdef CONFIG_PM 1445 /* if this triggers the device is still a sleep */ 1446 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { 1447 /* transmission will be done in resume */ 1448 usb_anchor_urb(urb, &dev->deferred); 1449 /* no use to process more packets */ 1450 netif_stop_queue(net); 1451 usb_put_urb(urb); 1452 spin_unlock_irqrestore(&dev->txq.lock, flags); 1453 netdev_dbg(dev->net, "Delaying transmission for resumption\n"); 1454 goto deferred; 1455 } 1456 #endif 1457 1458 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { 1459 case -EPIPE: 1460 netif_stop_queue (net); 1461 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1462 usb_autopm_put_interface_async(dev->intf); 1463 break; 1464 default: 1465 usb_autopm_put_interface_async(dev->intf); 1466 netif_dbg(dev, tx_err, dev->net, 1467 "tx: submit urb err %d\n", retval); 1468 break; 1469 case 0: 1470 netif_trans_update(net); 1471 __usbnet_queue_skb(&dev->txq, skb, tx_start); 1472 if (dev->txq.qlen >= TX_QLEN (dev)) 1473 netif_stop_queue (net); 1474 } 1475 spin_unlock_irqrestore (&dev->txq.lock, flags); 1476 1477 if (retval) { 1478 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); 1479 drop: 1480 dev->net->stats.tx_dropped++; 1481 not_drop: 1482 if (skb) 1483 dev_kfree_skb_any (skb); 1484 if (urb) { 1485 kfree(urb->sg); 1486 usb_free_urb(urb); 1487 } 1488 } else 1489 netif_dbg(dev, tx_queued, dev->net, 1490 "> tx, len %u, type 0x%x\n", length, skb->protocol); 1491 #ifdef CONFIG_PM 1492 deferred: 1493 #endif 1494 return NETDEV_TX_OK; 1495 } 1496 EXPORT_SYMBOL_GPL(usbnet_start_xmit); 1497 1498 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags) 1499 { 1500 struct urb *urb; 1501 int i; 1502 int ret = 0; 1503 1504 /* don't refill the queue all at once */ 1505 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) { 1506 urb = usb_alloc_urb(0, flags); 1507 if (urb != NULL) { 1508 ret = rx_submit(dev, urb, flags); 1509 if (ret) 1510 goto err; 1511 } else { 1512 ret = -ENOMEM; 1513 goto err; 1514 } 1515 } 1516 err: 1517 return ret; 1518 } 1519 1520 /*-------------------------------------------------------------------------*/ 1521 1522 // tasklet (work deferred from completions, in_irq) or timer 1523 1524 static void usbnet_bh (struct timer_list *t) 1525 { 1526 struct usbnet *dev = from_timer(dev, t, delay); 1527 struct sk_buff *skb; 1528 struct skb_data *entry; 1529 1530 while ((skb = skb_dequeue (&dev->done))) { 1531 entry = (struct skb_data *) skb->cb; 1532 switch (entry->state) { 1533 case rx_done: 1534 entry->state = rx_cleanup; 1535 rx_process (dev, skb); 1536 continue; 1537 case tx_done: 1538 kfree(entry->urb->sg); 1539 fallthrough; 1540 case rx_cleanup: 1541 usb_free_urb (entry->urb); 1542 dev_kfree_skb (skb); 1543 continue; 1544 default: 1545 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); 1546 } 1547 } 1548 1549 /* restart RX again after disabling due to high error rate */ 1550 clear_bit(EVENT_RX_KILL, &dev->flags); 1551 1552 /* waiting for all pending urbs to complete? 1553 * only then can we forgo submitting anew 1554 */ 1555 if (waitqueue_active(&dev->wait)) { 1556 if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0) 1557 wake_up_all(&dev->wait); 1558 1559 // or are we maybe short a few urbs? 1560 } else if (netif_running (dev->net) && 1561 netif_device_present (dev->net) && 1562 netif_carrier_ok(dev->net) && 1563 !timer_pending(&dev->delay) && 1564 !test_bit(EVENT_RX_PAUSED, &dev->flags) && 1565 !test_bit(EVENT_RX_HALT, &dev->flags)) { 1566 int temp = dev->rxq.qlen; 1567 1568 if (temp < RX_QLEN(dev)) { 1569 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK) 1570 return; 1571 if (temp != dev->rxq.qlen) 1572 netif_dbg(dev, link, dev->net, 1573 "rxqlen %d --> %d\n", 1574 temp, dev->rxq.qlen); 1575 if (dev->rxq.qlen < RX_QLEN(dev)) 1576 tasklet_schedule (&dev->bh); 1577 } 1578 if (dev->txq.qlen < TX_QLEN (dev)) 1579 netif_wake_queue (dev->net); 1580 } 1581 } 1582 1583 static void usbnet_bh_tasklet(struct tasklet_struct *t) 1584 { 1585 struct usbnet *dev = from_tasklet(dev, t, bh); 1586 1587 usbnet_bh(&dev->delay); 1588 } 1589 1590 1591 /*------------------------------------------------------------------------- 1592 * 1593 * USB Device Driver support 1594 * 1595 *-------------------------------------------------------------------------*/ 1596 1597 // precondition: never called in_interrupt 1598 1599 void usbnet_disconnect (struct usb_interface *intf) 1600 { 1601 struct usbnet *dev; 1602 struct usb_device *xdev; 1603 struct net_device *net; 1604 1605 dev = usb_get_intfdata(intf); 1606 usb_set_intfdata(intf, NULL); 1607 if (!dev) 1608 return; 1609 1610 xdev = interface_to_usbdev (intf); 1611 1612 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", 1613 intf->dev.driver->name, 1614 xdev->bus->bus_name, xdev->devpath, 1615 dev->driver_info->description); 1616 1617 if (dev->driver_info->unbind) 1618 dev->driver_info->unbind(dev, intf); 1619 1620 net = dev->net; 1621 unregister_netdev (net); 1622 1623 cancel_work_sync(&dev->kevent); 1624 1625 usb_scuttle_anchored_urbs(&dev->deferred); 1626 1627 usb_kill_urb(dev->interrupt); 1628 usb_free_urb(dev->interrupt); 1629 kfree(dev->padding_pkt); 1630 1631 free_percpu(net->tstats); 1632 free_netdev(net); 1633 } 1634 EXPORT_SYMBOL_GPL(usbnet_disconnect); 1635 1636 static const struct net_device_ops usbnet_netdev_ops = { 1637 .ndo_open = usbnet_open, 1638 .ndo_stop = usbnet_stop, 1639 .ndo_start_xmit = usbnet_start_xmit, 1640 .ndo_tx_timeout = usbnet_tx_timeout, 1641 .ndo_set_rx_mode = usbnet_set_rx_mode, 1642 .ndo_change_mtu = usbnet_change_mtu, 1643 .ndo_get_stats64 = dev_get_tstats64, 1644 .ndo_set_mac_address = eth_mac_addr, 1645 .ndo_validate_addr = eth_validate_addr, 1646 }; 1647 1648 /*-------------------------------------------------------------------------*/ 1649 1650 // precondition: never called in_interrupt 1651 1652 static struct device_type wlan_type = { 1653 .name = "wlan", 1654 }; 1655 1656 static struct device_type wwan_type = { 1657 .name = "wwan", 1658 }; 1659 1660 int 1661 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) 1662 { 1663 struct usbnet *dev; 1664 struct net_device *net; 1665 struct usb_host_interface *interface; 1666 const struct driver_info *info; 1667 struct usb_device *xdev; 1668 int status; 1669 const char *name; 1670 struct usb_driver *driver = to_usb_driver(udev->dev.driver); 1671 1672 /* usbnet already took usb runtime pm, so have to enable the feature 1673 * for usb interface, otherwise usb_autopm_get_interface may return 1674 * failure if RUNTIME_PM is enabled. 1675 */ 1676 if (!driver->supports_autosuspend) { 1677 driver->supports_autosuspend = 1; 1678 pm_runtime_enable(&udev->dev); 1679 } 1680 1681 name = udev->dev.driver->name; 1682 info = (const struct driver_info *) prod->driver_info; 1683 if (!info) { 1684 dev_dbg (&udev->dev, "blacklisted by %s\n", name); 1685 return -ENODEV; 1686 } 1687 xdev = interface_to_usbdev (udev); 1688 interface = udev->cur_altsetting; 1689 1690 status = -ENOMEM; 1691 1692 // set up our own records 1693 net = alloc_etherdev(sizeof(*dev)); 1694 if (!net) 1695 goto out; 1696 1697 /* netdev_printk() needs this so do it as early as possible */ 1698 SET_NETDEV_DEV(net, &udev->dev); 1699 1700 dev = netdev_priv(net); 1701 dev->udev = xdev; 1702 dev->intf = udev; 1703 dev->driver_info = info; 1704 dev->driver_name = name; 1705 dev->rx_speed = SPEED_UNSET; 1706 dev->tx_speed = SPEED_UNSET; 1707 1708 net->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1709 if (!net->tstats) 1710 goto out0; 1711 1712 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV 1713 | NETIF_MSG_PROBE | NETIF_MSG_LINK); 1714 init_waitqueue_head(&dev->wait); 1715 skb_queue_head_init (&dev->rxq); 1716 skb_queue_head_init (&dev->txq); 1717 skb_queue_head_init (&dev->done); 1718 skb_queue_head_init(&dev->rxq_pause); 1719 tasklet_setup(&dev->bh, usbnet_bh_tasklet); 1720 INIT_WORK (&dev->kevent, usbnet_deferred_kevent); 1721 init_usb_anchor(&dev->deferred); 1722 timer_setup(&dev->delay, usbnet_bh, 0); 1723 mutex_init (&dev->phy_mutex); 1724 mutex_init(&dev->interrupt_mutex); 1725 dev->interrupt_count = 0; 1726 1727 dev->net = net; 1728 strscpy(net->name, "usb%d", sizeof(net->name)); 1729 memcpy (net->dev_addr, node_id, sizeof node_id); 1730 1731 /* rx and tx sides can use different message sizes; 1732 * bind() should set rx_urb_size in that case. 1733 */ 1734 dev->hard_mtu = net->mtu + net->hard_header_len; 1735 net->min_mtu = 0; 1736 net->max_mtu = ETH_MAX_MTU; 1737 1738 net->netdev_ops = &usbnet_netdev_ops; 1739 net->watchdog_timeo = TX_TIMEOUT_JIFFIES; 1740 net->ethtool_ops = &usbnet_ethtool_ops; 1741 1742 // allow device-specific bind/init procedures 1743 // NOTE net->name still not usable ... 1744 if (info->bind) { 1745 status = info->bind (dev, udev); 1746 if (status < 0) 1747 goto out1; 1748 1749 // heuristic: "usb%d" for links we know are two-host, 1750 // else "eth%d" when there's reasonable doubt. userspace 1751 // can rename the link if it knows better. 1752 if ((dev->driver_info->flags & FLAG_ETHER) != 0 && 1753 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 || 1754 (net->dev_addr [0] & 0x02) == 0)) 1755 strscpy(net->name, "eth%d", sizeof(net->name)); 1756 /* WLAN devices should always be named "wlan%d" */ 1757 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1758 strscpy(net->name, "wlan%d", sizeof(net->name)); 1759 /* WWAN devices should always be named "wwan%d" */ 1760 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1761 strscpy(net->name, "wwan%d", sizeof(net->name)); 1762 1763 /* devices that cannot do ARP */ 1764 if ((dev->driver_info->flags & FLAG_NOARP) != 0) 1765 net->flags |= IFF_NOARP; 1766 1767 /* maybe the remote can't receive an Ethernet MTU */ 1768 if (net->mtu > (dev->hard_mtu - net->hard_header_len)) 1769 net->mtu = dev->hard_mtu - net->hard_header_len; 1770 } else if (!info->in || !info->out) 1771 status = usbnet_get_endpoints (dev, udev); 1772 else { 1773 dev->in = usb_rcvbulkpipe (xdev, info->in); 1774 dev->out = usb_sndbulkpipe (xdev, info->out); 1775 if (!(info->flags & FLAG_NO_SETINT)) 1776 status = usb_set_interface (xdev, 1777 interface->desc.bInterfaceNumber, 1778 interface->desc.bAlternateSetting); 1779 else 1780 status = 0; 1781 1782 } 1783 if (status >= 0 && dev->status) 1784 status = init_status (dev, udev); 1785 if (status < 0) 1786 goto out3; 1787 1788 if (!dev->rx_urb_size) 1789 dev->rx_urb_size = dev->hard_mtu; 1790 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); 1791 1792 /* let userspace know we have a random address */ 1793 if (ether_addr_equal(net->dev_addr, node_id)) 1794 net->addr_assign_type = NET_ADDR_RANDOM; 1795 1796 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1797 SET_NETDEV_DEVTYPE(net, &wlan_type); 1798 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1799 SET_NETDEV_DEVTYPE(net, &wwan_type); 1800 1801 /* initialize max rx_qlen and tx_qlen */ 1802 usbnet_update_max_qlen(dev); 1803 1804 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) && 1805 !(info->flags & FLAG_MULTI_PACKET)) { 1806 dev->padding_pkt = kzalloc(1, GFP_KERNEL); 1807 if (!dev->padding_pkt) { 1808 status = -ENOMEM; 1809 goto out4; 1810 } 1811 } 1812 1813 status = register_netdev (net); 1814 if (status) 1815 goto out5; 1816 netif_info(dev, probe, dev->net, 1817 "register '%s' at usb-%s-%s, %s, %pM\n", 1818 udev->dev.driver->name, 1819 xdev->bus->bus_name, xdev->devpath, 1820 dev->driver_info->description, 1821 net->dev_addr); 1822 1823 // ok, it's ready to go. 1824 usb_set_intfdata (udev, dev); 1825 1826 netif_device_attach (net); 1827 1828 if (dev->driver_info->flags & FLAG_LINK_INTR) 1829 usbnet_link_change(dev, 0, 0); 1830 1831 return 0; 1832 1833 out5: 1834 kfree(dev->padding_pkt); 1835 out4: 1836 usb_free_urb(dev->interrupt); 1837 out3: 1838 if (info->unbind) 1839 info->unbind (dev, udev); 1840 out1: 1841 /* subdrivers must undo all they did in bind() if they 1842 * fail it, but we may fail later and a deferred kevent 1843 * may trigger an error resubmitting itself and, worse, 1844 * schedule a timer. So we kill it all just in case. 1845 */ 1846 cancel_work_sync(&dev->kevent); 1847 del_timer_sync(&dev->delay); 1848 free_percpu(net->tstats); 1849 out0: 1850 free_netdev(net); 1851 out: 1852 return status; 1853 } 1854 EXPORT_SYMBOL_GPL(usbnet_probe); 1855 1856 /*-------------------------------------------------------------------------*/ 1857 1858 /* 1859 * suspend the whole driver as soon as the first interface is suspended 1860 * resume only when the last interface is resumed 1861 */ 1862 1863 int usbnet_suspend (struct usb_interface *intf, pm_message_t message) 1864 { 1865 struct usbnet *dev = usb_get_intfdata(intf); 1866 1867 if (!dev->suspend_count++) { 1868 spin_lock_irq(&dev->txq.lock); 1869 /* don't autosuspend while transmitting */ 1870 if (dev->txq.qlen && PMSG_IS_AUTO(message)) { 1871 dev->suspend_count--; 1872 spin_unlock_irq(&dev->txq.lock); 1873 return -EBUSY; 1874 } else { 1875 set_bit(EVENT_DEV_ASLEEP, &dev->flags); 1876 spin_unlock_irq(&dev->txq.lock); 1877 } 1878 /* 1879 * accelerate emptying of the rx and queues, to avoid 1880 * having everything error out. 1881 */ 1882 netif_device_detach (dev->net); 1883 usbnet_terminate_urbs(dev); 1884 __usbnet_status_stop_force(dev); 1885 1886 /* 1887 * reattach so runtime management can use and 1888 * wake the device 1889 */ 1890 netif_device_attach (dev->net); 1891 } 1892 return 0; 1893 } 1894 EXPORT_SYMBOL_GPL(usbnet_suspend); 1895 1896 int usbnet_resume (struct usb_interface *intf) 1897 { 1898 struct usbnet *dev = usb_get_intfdata(intf); 1899 struct sk_buff *skb; 1900 struct urb *res; 1901 int retval; 1902 1903 if (!--dev->suspend_count) { 1904 /* resume interrupt URB if it was previously submitted */ 1905 __usbnet_status_start_force(dev, GFP_NOIO); 1906 1907 spin_lock_irq(&dev->txq.lock); 1908 while ((res = usb_get_from_anchor(&dev->deferred))) { 1909 1910 skb = (struct sk_buff *)res->context; 1911 retval = usb_submit_urb(res, GFP_ATOMIC); 1912 if (retval < 0) { 1913 dev_kfree_skb_any(skb); 1914 kfree(res->sg); 1915 usb_free_urb(res); 1916 usb_autopm_put_interface_async(dev->intf); 1917 } else { 1918 netif_trans_update(dev->net); 1919 __skb_queue_tail(&dev->txq, skb); 1920 } 1921 } 1922 1923 smp_mb(); 1924 clear_bit(EVENT_DEV_ASLEEP, &dev->flags); 1925 spin_unlock_irq(&dev->txq.lock); 1926 1927 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) { 1928 /* handle remote wakeup ASAP 1929 * we cannot race against stop 1930 */ 1931 if (netif_device_present(dev->net) && 1932 !timer_pending(&dev->delay) && 1933 !test_bit(EVENT_RX_HALT, &dev->flags)) 1934 rx_alloc_submit(dev, GFP_NOIO); 1935 1936 if (!(dev->txq.qlen >= TX_QLEN(dev))) 1937 netif_tx_wake_all_queues(dev->net); 1938 tasklet_schedule (&dev->bh); 1939 } 1940 } 1941 1942 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) 1943 usb_autopm_get_interface_no_resume(intf); 1944 1945 return 0; 1946 } 1947 EXPORT_SYMBOL_GPL(usbnet_resume); 1948 1949 /* 1950 * Either a subdriver implements manage_power, then it is assumed to always 1951 * be ready to be suspended or it reports the readiness to be suspended 1952 * explicitly 1953 */ 1954 void usbnet_device_suggests_idle(struct usbnet *dev) 1955 { 1956 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) { 1957 dev->intf->needs_remote_wakeup = 1; 1958 usb_autopm_put_interface_async(dev->intf); 1959 } 1960 } 1961 EXPORT_SYMBOL(usbnet_device_suggests_idle); 1962 1963 /* 1964 * For devices that can do without special commands 1965 */ 1966 int usbnet_manage_power(struct usbnet *dev, int on) 1967 { 1968 dev->intf->needs_remote_wakeup = on; 1969 return 0; 1970 } 1971 EXPORT_SYMBOL(usbnet_manage_power); 1972 1973 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset) 1974 { 1975 /* update link after link is reseted */ 1976 if (link && !need_reset) 1977 netif_carrier_on(dev->net); 1978 else 1979 netif_carrier_off(dev->net); 1980 1981 if (need_reset && link) 1982 usbnet_defer_kevent(dev, EVENT_LINK_RESET); 1983 else 1984 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE); 1985 } 1986 EXPORT_SYMBOL(usbnet_link_change); 1987 1988 /*-------------------------------------------------------------------------*/ 1989 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1990 u16 value, u16 index, void *data, u16 size) 1991 { 1992 void *buf = NULL; 1993 int err = -ENOMEM; 1994 1995 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x" 1996 " value=0x%04x index=0x%04x size=%d\n", 1997 cmd, reqtype, value, index, size); 1998 1999 if (size) { 2000 buf = kmalloc(size, GFP_KERNEL); 2001 if (!buf) 2002 goto out; 2003 } 2004 2005 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), 2006 cmd, reqtype, value, index, buf, size, 2007 USB_CTRL_GET_TIMEOUT); 2008 if (err > 0 && err <= size) { 2009 if (data) 2010 memcpy(data, buf, err); 2011 else 2012 netdev_dbg(dev->net, 2013 "Huh? Data requested but thrown away.\n"); 2014 } 2015 kfree(buf); 2016 out: 2017 return err; 2018 } 2019 2020 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 2021 u16 value, u16 index, const void *data, 2022 u16 size) 2023 { 2024 void *buf = NULL; 2025 int err = -ENOMEM; 2026 2027 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 2028 " value=0x%04x index=0x%04x size=%d\n", 2029 cmd, reqtype, value, index, size); 2030 2031 if (data) { 2032 buf = kmemdup(data, size, GFP_KERNEL); 2033 if (!buf) 2034 goto out; 2035 } else { 2036 if (size) { 2037 WARN_ON_ONCE(1); 2038 err = -EINVAL; 2039 goto out; 2040 } 2041 } 2042 2043 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), 2044 cmd, reqtype, value, index, buf, size, 2045 USB_CTRL_SET_TIMEOUT); 2046 kfree(buf); 2047 2048 out: 2049 return err; 2050 } 2051 2052 /* 2053 * The function can't be called inside suspend/resume callback, 2054 * otherwise deadlock will be caused. 2055 */ 2056 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 2057 u16 value, u16 index, void *data, u16 size) 2058 { 2059 int ret; 2060 2061 if (usb_autopm_get_interface(dev->intf) < 0) 2062 return -ENODEV; 2063 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index, 2064 data, size); 2065 usb_autopm_put_interface(dev->intf); 2066 return ret; 2067 } 2068 EXPORT_SYMBOL_GPL(usbnet_read_cmd); 2069 2070 /* 2071 * The function can't be called inside suspend/resume callback, 2072 * otherwise deadlock will be caused. 2073 */ 2074 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 2075 u16 value, u16 index, const void *data, u16 size) 2076 { 2077 int ret; 2078 2079 if (usb_autopm_get_interface(dev->intf) < 0) 2080 return -ENODEV; 2081 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index, 2082 data, size); 2083 usb_autopm_put_interface(dev->intf); 2084 return ret; 2085 } 2086 EXPORT_SYMBOL_GPL(usbnet_write_cmd); 2087 2088 /* 2089 * The function can be called inside suspend/resume callback safely 2090 * and should only be called by suspend/resume callback generally. 2091 */ 2092 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 2093 u16 value, u16 index, void *data, u16 size) 2094 { 2095 return __usbnet_read_cmd(dev, cmd, reqtype, value, index, 2096 data, size); 2097 } 2098 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm); 2099 2100 /* 2101 * The function can be called inside suspend/resume callback safely 2102 * and should only be called by suspend/resume callback generally. 2103 */ 2104 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 2105 u16 value, u16 index, const void *data, 2106 u16 size) 2107 { 2108 return __usbnet_write_cmd(dev, cmd, reqtype, value, index, 2109 data, size); 2110 } 2111 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm); 2112 2113 static void usbnet_async_cmd_cb(struct urb *urb) 2114 { 2115 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context; 2116 int status = urb->status; 2117 2118 if (status < 0) 2119 dev_dbg(&urb->dev->dev, "%s failed with %d", 2120 __func__, status); 2121 2122 kfree(req); 2123 usb_free_urb(urb); 2124 } 2125 2126 /* 2127 * The caller must make sure that device can't be put into suspend 2128 * state until the control URB completes. 2129 */ 2130 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype, 2131 u16 value, u16 index, const void *data, u16 size) 2132 { 2133 struct usb_ctrlrequest *req = NULL; 2134 struct urb *urb; 2135 int err = -ENOMEM; 2136 void *buf = NULL; 2137 2138 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 2139 " value=0x%04x index=0x%04x size=%d\n", 2140 cmd, reqtype, value, index, size); 2141 2142 urb = usb_alloc_urb(0, GFP_ATOMIC); 2143 if (!urb) 2144 goto fail; 2145 2146 if (data) { 2147 buf = kmemdup(data, size, GFP_ATOMIC); 2148 if (!buf) { 2149 netdev_err(dev->net, "Error allocating buffer" 2150 " in %s!\n", __func__); 2151 goto fail_free; 2152 } 2153 } 2154 2155 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC); 2156 if (!req) 2157 goto fail_free_buf; 2158 2159 req->bRequestType = reqtype; 2160 req->bRequest = cmd; 2161 req->wValue = cpu_to_le16(value); 2162 req->wIndex = cpu_to_le16(index); 2163 req->wLength = cpu_to_le16(size); 2164 2165 usb_fill_control_urb(urb, dev->udev, 2166 usb_sndctrlpipe(dev->udev, 0), 2167 (void *)req, buf, size, 2168 usbnet_async_cmd_cb, req); 2169 urb->transfer_flags |= URB_FREE_BUFFER; 2170 2171 err = usb_submit_urb(urb, GFP_ATOMIC); 2172 if (err < 0) { 2173 netdev_err(dev->net, "Error submitting the control" 2174 " message: status=%d\n", err); 2175 goto fail_free; 2176 } 2177 return 0; 2178 2179 fail_free_buf: 2180 kfree(buf); 2181 fail_free: 2182 kfree(req); 2183 usb_free_urb(urb); 2184 fail: 2185 return err; 2186 2187 } 2188 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async); 2189 /*-------------------------------------------------------------------------*/ 2190 2191 static int __init usbnet_init(void) 2192 { 2193 /* Compiler should optimize this out. */ 2194 BUILD_BUG_ON( 2195 sizeof_field(struct sk_buff, cb) < sizeof(struct skb_data)); 2196 2197 eth_random_addr(node_id); 2198 return 0; 2199 } 2200 module_init(usbnet_init); 2201 2202 static void __exit usbnet_exit(void) 2203 { 2204 } 2205 module_exit(usbnet_exit); 2206 2207 MODULE_AUTHOR("David Brownell"); 2208 MODULE_DESCRIPTION("USB network driver framework"); 2209 MODULE_LICENSE("GPL"); 2210