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 u8 addr[ETH_ALEN]; 169 int tmp = -1, ret; 170 unsigned char buf [13]; 171 172 ret = usb_string(dev->udev, iMACAddress, buf, sizeof buf); 173 if (ret == 12) 174 tmp = hex2bin(addr, buf, 6); 175 if (tmp < 0) { 176 dev_dbg(&dev->udev->dev, 177 "bad MAC string %d fetch, %d\n", iMACAddress, tmp); 178 if (ret >= 0) 179 ret = -EINVAL; 180 return ret; 181 } 182 eth_hw_addr_set(dev->net, addr); 183 return 0; 184 } 185 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr); 186 187 static void intr_complete (struct urb *urb) 188 { 189 struct usbnet *dev = urb->context; 190 int status = urb->status; 191 192 switch (status) { 193 /* success */ 194 case 0: 195 dev->driver_info->status(dev, urb); 196 break; 197 198 /* software-driven interface shutdown */ 199 case -ENOENT: /* urb killed */ 200 case -ESHUTDOWN: /* hardware gone */ 201 netif_dbg(dev, ifdown, dev->net, 202 "intr shutdown, code %d\n", status); 203 return; 204 205 /* NOTE: not throttling like RX/TX, since this endpoint 206 * already polls infrequently 207 */ 208 default: 209 netdev_dbg(dev->net, "intr status %d\n", status); 210 break; 211 } 212 213 status = usb_submit_urb (urb, GFP_ATOMIC); 214 if (status != 0) 215 netif_err(dev, timer, dev->net, 216 "intr resubmit --> %d\n", status); 217 } 218 219 static int init_status (struct usbnet *dev, struct usb_interface *intf) 220 { 221 char *buf = NULL; 222 unsigned pipe = 0; 223 unsigned maxp; 224 unsigned period; 225 226 if (!dev->driver_info->status) 227 return 0; 228 229 pipe = usb_rcvintpipe (dev->udev, 230 dev->status->desc.bEndpointAddress 231 & USB_ENDPOINT_NUMBER_MASK); 232 maxp = usb_maxpacket (dev->udev, pipe, 0); 233 234 /* avoid 1 msec chatter: min 8 msec poll rate */ 235 period = max ((int) dev->status->desc.bInterval, 236 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3); 237 238 buf = kmalloc (maxp, GFP_KERNEL); 239 if (buf) { 240 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL); 241 if (!dev->interrupt) { 242 kfree (buf); 243 return -ENOMEM; 244 } else { 245 usb_fill_int_urb(dev->interrupt, dev->udev, pipe, 246 buf, maxp, intr_complete, dev, period); 247 dev->interrupt->transfer_flags |= URB_FREE_BUFFER; 248 dev_dbg(&intf->dev, 249 "status ep%din, %d bytes period %d\n", 250 usb_pipeendpoint(pipe), maxp, period); 251 } 252 } 253 return 0; 254 } 255 256 /* Submit the interrupt URB if not previously submitted, increasing refcount */ 257 int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags) 258 { 259 int ret = 0; 260 261 WARN_ON_ONCE(dev->interrupt == NULL); 262 if (dev->interrupt) { 263 mutex_lock(&dev->interrupt_mutex); 264 265 if (++dev->interrupt_count == 1) 266 ret = usb_submit_urb(dev->interrupt, mem_flags); 267 268 dev_dbg(&dev->udev->dev, "incremented interrupt URB count to %d\n", 269 dev->interrupt_count); 270 mutex_unlock(&dev->interrupt_mutex); 271 } 272 return ret; 273 } 274 EXPORT_SYMBOL_GPL(usbnet_status_start); 275 276 /* For resume; submit interrupt URB if previously submitted */ 277 static int __usbnet_status_start_force(struct usbnet *dev, gfp_t mem_flags) 278 { 279 int ret = 0; 280 281 mutex_lock(&dev->interrupt_mutex); 282 if (dev->interrupt_count) { 283 ret = usb_submit_urb(dev->interrupt, mem_flags); 284 dev_dbg(&dev->udev->dev, 285 "submitted interrupt URB for resume\n"); 286 } 287 mutex_unlock(&dev->interrupt_mutex); 288 return ret; 289 } 290 291 /* Kill the interrupt URB if all submitters want it killed */ 292 void usbnet_status_stop(struct usbnet *dev) 293 { 294 if (dev->interrupt) { 295 mutex_lock(&dev->interrupt_mutex); 296 WARN_ON(dev->interrupt_count == 0); 297 298 if (dev->interrupt_count && --dev->interrupt_count == 0) 299 usb_kill_urb(dev->interrupt); 300 301 dev_dbg(&dev->udev->dev, 302 "decremented interrupt URB count to %d\n", 303 dev->interrupt_count); 304 mutex_unlock(&dev->interrupt_mutex); 305 } 306 } 307 EXPORT_SYMBOL_GPL(usbnet_status_stop); 308 309 /* For suspend; always kill interrupt URB */ 310 static void __usbnet_status_stop_force(struct usbnet *dev) 311 { 312 if (dev->interrupt) { 313 mutex_lock(&dev->interrupt_mutex); 314 usb_kill_urb(dev->interrupt); 315 dev_dbg(&dev->udev->dev, "killed interrupt URB for suspend\n"); 316 mutex_unlock(&dev->interrupt_mutex); 317 } 318 } 319 320 /* Passes this packet up the stack, updating its accounting. 321 * Some link protocols batch packets, so their rx_fixup paths 322 * can return clones as well as just modify the original skb. 323 */ 324 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb) 325 { 326 struct pcpu_sw_netstats *stats64 = this_cpu_ptr(dev->net->tstats); 327 unsigned long flags; 328 int status; 329 330 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) { 331 skb_queue_tail(&dev->rxq_pause, skb); 332 return; 333 } 334 335 /* only update if unset to allow minidriver rx_fixup override */ 336 if (skb->protocol == 0) 337 skb->protocol = eth_type_trans (skb, dev->net); 338 339 flags = u64_stats_update_begin_irqsave(&stats64->syncp); 340 stats64->rx_packets++; 341 stats64->rx_bytes += skb->len; 342 u64_stats_update_end_irqrestore(&stats64->syncp, flags); 343 344 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n", 345 skb->len + sizeof (struct ethhdr), skb->protocol); 346 memset (skb->cb, 0, sizeof (struct skb_data)); 347 348 if (skb_defer_rx_timestamp(skb)) 349 return; 350 351 status = netif_rx (skb); 352 if (status != NET_RX_SUCCESS) 353 netif_dbg(dev, rx_err, dev->net, 354 "netif_rx status %d\n", status); 355 } 356 EXPORT_SYMBOL_GPL(usbnet_skb_return); 357 358 /* must be called if hard_mtu or rx_urb_size changed */ 359 void usbnet_update_max_qlen(struct usbnet *dev) 360 { 361 enum usb_device_speed speed = dev->udev->speed; 362 363 if (!dev->rx_urb_size || !dev->hard_mtu) 364 goto insanity; 365 switch (speed) { 366 case USB_SPEED_HIGH: 367 dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size; 368 dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu; 369 break; 370 case USB_SPEED_SUPER: 371 case USB_SPEED_SUPER_PLUS: 372 /* 373 * Not take default 5ms qlen for super speed HC to 374 * save memory, and iperf tests show 2.5ms qlen can 375 * work well 376 */ 377 dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size; 378 dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu; 379 break; 380 default: 381 insanity: 382 dev->rx_qlen = dev->tx_qlen = 4; 383 } 384 } 385 EXPORT_SYMBOL_GPL(usbnet_update_max_qlen); 386 387 388 /*------------------------------------------------------------------------- 389 * 390 * Network Device Driver (peer link to "Host Device", from USB host) 391 * 392 *-------------------------------------------------------------------------*/ 393 394 int usbnet_change_mtu (struct net_device *net, int new_mtu) 395 { 396 struct usbnet *dev = netdev_priv(net); 397 int ll_mtu = new_mtu + net->hard_header_len; 398 int old_hard_mtu = dev->hard_mtu; 399 int old_rx_urb_size = dev->rx_urb_size; 400 401 // no second zero-length packet read wanted after mtu-sized packets 402 if ((ll_mtu % dev->maxpacket) == 0) 403 return -EDOM; 404 net->mtu = new_mtu; 405 406 dev->hard_mtu = net->mtu + net->hard_header_len; 407 if (dev->rx_urb_size == old_hard_mtu) { 408 dev->rx_urb_size = dev->hard_mtu; 409 if (dev->rx_urb_size > old_rx_urb_size) { 410 usbnet_pause_rx(dev); 411 usbnet_unlink_rx_urbs(dev); 412 usbnet_resume_rx(dev); 413 } 414 } 415 416 /* max qlen depend on hard_mtu and rx_urb_size */ 417 usbnet_update_max_qlen(dev); 418 419 return 0; 420 } 421 EXPORT_SYMBOL_GPL(usbnet_change_mtu); 422 423 /* The caller must hold list->lock */ 424 static void __usbnet_queue_skb(struct sk_buff_head *list, 425 struct sk_buff *newsk, enum skb_state state) 426 { 427 struct skb_data *entry = (struct skb_data *) newsk->cb; 428 429 __skb_queue_tail(list, newsk); 430 entry->state = state; 431 } 432 433 /*-------------------------------------------------------------------------*/ 434 435 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from 436 * completion callbacks. 2.5 should have fixed those bugs... 437 */ 438 439 static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb, 440 struct sk_buff_head *list, enum skb_state state) 441 { 442 unsigned long flags; 443 enum skb_state old_state; 444 struct skb_data *entry = (struct skb_data *) skb->cb; 445 446 spin_lock_irqsave(&list->lock, flags); 447 old_state = entry->state; 448 entry->state = state; 449 __skb_unlink(skb, list); 450 451 /* defer_bh() is never called with list == &dev->done. 452 * spin_lock_nested() tells lockdep that it is OK to take 453 * dev->done.lock here with list->lock held. 454 */ 455 spin_lock_nested(&dev->done.lock, SINGLE_DEPTH_NESTING); 456 457 __skb_queue_tail(&dev->done, skb); 458 if (dev->done.qlen == 1) 459 tasklet_schedule(&dev->bh); 460 spin_unlock(&dev->done.lock); 461 spin_unlock_irqrestore(&list->lock, flags); 462 return old_state; 463 } 464 465 /* some work can't be done in tasklets, so we use keventd 466 * 467 * NOTE: annoying asymmetry: if it's active, schedule_work() fails, 468 * but tasklet_schedule() doesn't. hope the failure is rare. 469 */ 470 void usbnet_defer_kevent (struct usbnet *dev, int work) 471 { 472 set_bit (work, &dev->flags); 473 if (!schedule_work (&dev->kevent)) 474 netdev_dbg(dev->net, "kevent %s may have been dropped\n", usbnet_event_names[work]); 475 else 476 netdev_dbg(dev->net, "kevent %s scheduled\n", usbnet_event_names[work]); 477 } 478 EXPORT_SYMBOL_GPL(usbnet_defer_kevent); 479 480 /*-------------------------------------------------------------------------*/ 481 482 static void rx_complete (struct urb *urb); 483 484 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) 485 { 486 struct sk_buff *skb; 487 struct skb_data *entry; 488 int retval = 0; 489 unsigned long lockflags; 490 size_t size = dev->rx_urb_size; 491 492 /* prevent rx skb allocation when error ratio is high */ 493 if (test_bit(EVENT_RX_KILL, &dev->flags)) { 494 usb_free_urb(urb); 495 return -ENOLINK; 496 } 497 498 if (test_bit(EVENT_NO_IP_ALIGN, &dev->flags)) 499 skb = __netdev_alloc_skb(dev->net, size, flags); 500 else 501 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags); 502 if (!skb) { 503 netif_dbg(dev, rx_err, dev->net, "no rx skb\n"); 504 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 505 usb_free_urb (urb); 506 return -ENOMEM; 507 } 508 509 entry = (struct skb_data *) skb->cb; 510 entry->urb = urb; 511 entry->dev = dev; 512 entry->length = 0; 513 514 usb_fill_bulk_urb (urb, dev->udev, dev->in, 515 skb->data, size, rx_complete, skb); 516 517 spin_lock_irqsave (&dev->rxq.lock, lockflags); 518 519 if (netif_running (dev->net) && 520 netif_device_present (dev->net) && 521 test_bit(EVENT_DEV_OPEN, &dev->flags) && 522 !test_bit (EVENT_RX_HALT, &dev->flags) && 523 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) { 524 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) { 525 case -EPIPE: 526 usbnet_defer_kevent (dev, EVENT_RX_HALT); 527 break; 528 case -ENOMEM: 529 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 530 break; 531 case -ENODEV: 532 netif_dbg(dev, ifdown, dev->net, "device gone\n"); 533 netif_device_detach (dev->net); 534 break; 535 case -EHOSTUNREACH: 536 retval = -ENOLINK; 537 break; 538 default: 539 netif_dbg(dev, rx_err, dev->net, 540 "rx submit, %d\n", retval); 541 tasklet_schedule (&dev->bh); 542 break; 543 case 0: 544 __usbnet_queue_skb(&dev->rxq, skb, rx_start); 545 } 546 } else { 547 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n"); 548 retval = -ENOLINK; 549 } 550 spin_unlock_irqrestore (&dev->rxq.lock, lockflags); 551 if (retval) { 552 dev_kfree_skb_any (skb); 553 usb_free_urb (urb); 554 } 555 return retval; 556 } 557 558 559 /*-------------------------------------------------------------------------*/ 560 561 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb) 562 { 563 if (dev->driver_info->rx_fixup && 564 !dev->driver_info->rx_fixup (dev, skb)) { 565 /* With RX_ASSEMBLE, rx_fixup() must update counters */ 566 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE)) 567 dev->net->stats.rx_errors++; 568 goto done; 569 } 570 // else network stack removes extra byte if we forced a short packet 571 572 /* all data was already cloned from skb inside the driver */ 573 if (dev->driver_info->flags & FLAG_MULTI_PACKET) 574 goto done; 575 576 if (skb->len < ETH_HLEN) { 577 dev->net->stats.rx_errors++; 578 dev->net->stats.rx_length_errors++; 579 netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len); 580 } else { 581 usbnet_skb_return(dev, skb); 582 return; 583 } 584 585 done: 586 skb_queue_tail(&dev->done, skb); 587 } 588 589 /*-------------------------------------------------------------------------*/ 590 591 static void rx_complete (struct urb *urb) 592 { 593 struct sk_buff *skb = (struct sk_buff *) urb->context; 594 struct skb_data *entry = (struct skb_data *) skb->cb; 595 struct usbnet *dev = entry->dev; 596 int urb_status = urb->status; 597 enum skb_state state; 598 599 skb_put (skb, urb->actual_length); 600 state = rx_done; 601 entry->urb = NULL; 602 603 switch (urb_status) { 604 /* success */ 605 case 0: 606 break; 607 608 /* stalls need manual reset. this is rare ... except that 609 * when going through USB 2.0 TTs, unplug appears this way. 610 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ 611 * storm, recovering as needed. 612 */ 613 case -EPIPE: 614 dev->net->stats.rx_errors++; 615 usbnet_defer_kevent (dev, EVENT_RX_HALT); 616 fallthrough; 617 618 /* software-driven interface shutdown */ 619 case -ECONNRESET: /* async unlink */ 620 case -ESHUTDOWN: /* hardware gone */ 621 netif_dbg(dev, ifdown, dev->net, 622 "rx shutdown, code %d\n", urb_status); 623 goto block; 624 625 /* we get controller i/o faults during hub_wq disconnect() delays. 626 * throttle down resubmits, to avoid log floods; just temporarily, 627 * so we still recover when the fault isn't a hub_wq delay. 628 */ 629 case -EPROTO: 630 case -ETIME: 631 case -EILSEQ: 632 dev->net->stats.rx_errors++; 633 if (!timer_pending (&dev->delay)) { 634 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); 635 netif_dbg(dev, link, dev->net, 636 "rx throttle %d\n", urb_status); 637 } 638 block: 639 state = rx_cleanup; 640 entry->urb = urb; 641 urb = NULL; 642 break; 643 644 /* data overrun ... flush fifo? */ 645 case -EOVERFLOW: 646 dev->net->stats.rx_over_errors++; 647 fallthrough; 648 649 default: 650 state = rx_cleanup; 651 dev->net->stats.rx_errors++; 652 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status); 653 break; 654 } 655 656 /* stop rx if packet error rate is high */ 657 if (++dev->pkt_cnt > 30) { 658 dev->pkt_cnt = 0; 659 dev->pkt_err = 0; 660 } else { 661 if (state == rx_cleanup) 662 dev->pkt_err++; 663 if (dev->pkt_err > 20) 664 set_bit(EVENT_RX_KILL, &dev->flags); 665 } 666 667 state = defer_bh(dev, skb, &dev->rxq, state); 668 669 if (urb) { 670 if (netif_running (dev->net) && 671 !test_bit (EVENT_RX_HALT, &dev->flags) && 672 state != unlink_start) { 673 rx_submit (dev, urb, GFP_ATOMIC); 674 usb_mark_last_busy(dev->udev); 675 return; 676 } 677 usb_free_urb (urb); 678 } 679 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n"); 680 } 681 682 /*-------------------------------------------------------------------------*/ 683 void usbnet_pause_rx(struct usbnet *dev) 684 { 685 set_bit(EVENT_RX_PAUSED, &dev->flags); 686 687 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n"); 688 } 689 EXPORT_SYMBOL_GPL(usbnet_pause_rx); 690 691 void usbnet_resume_rx(struct usbnet *dev) 692 { 693 struct sk_buff *skb; 694 int num = 0; 695 696 clear_bit(EVENT_RX_PAUSED, &dev->flags); 697 698 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) { 699 usbnet_skb_return(dev, skb); 700 num++; 701 } 702 703 tasklet_schedule(&dev->bh); 704 705 netif_dbg(dev, rx_status, dev->net, 706 "paused rx queue disabled, %d skbs requeued\n", num); 707 } 708 EXPORT_SYMBOL_GPL(usbnet_resume_rx); 709 710 void usbnet_purge_paused_rxq(struct usbnet *dev) 711 { 712 skb_queue_purge(&dev->rxq_pause); 713 } 714 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq); 715 716 /*-------------------------------------------------------------------------*/ 717 718 // unlink pending rx/tx; completion handlers do all other cleanup 719 720 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) 721 { 722 unsigned long flags; 723 struct sk_buff *skb; 724 int count = 0; 725 726 spin_lock_irqsave (&q->lock, flags); 727 while (!skb_queue_empty(q)) { 728 struct skb_data *entry; 729 struct urb *urb; 730 int retval; 731 732 skb_queue_walk(q, skb) { 733 entry = (struct skb_data *) skb->cb; 734 if (entry->state != unlink_start) 735 goto found; 736 } 737 break; 738 found: 739 entry->state = unlink_start; 740 urb = entry->urb; 741 742 /* 743 * Get reference count of the URB to avoid it to be 744 * freed during usb_unlink_urb, which may trigger 745 * use-after-free problem inside usb_unlink_urb since 746 * usb_unlink_urb is always racing with .complete 747 * handler(include defer_bh). 748 */ 749 usb_get_urb(urb); 750 spin_unlock_irqrestore(&q->lock, flags); 751 // during some PM-driven resume scenarios, 752 // these (async) unlinks complete immediately 753 retval = usb_unlink_urb (urb); 754 if (retval != -EINPROGRESS && retval != 0) 755 netdev_dbg(dev->net, "unlink urb err, %d\n", retval); 756 else 757 count++; 758 usb_put_urb(urb); 759 spin_lock_irqsave(&q->lock, flags); 760 } 761 spin_unlock_irqrestore (&q->lock, flags); 762 return count; 763 } 764 765 // Flush all pending rx urbs 766 // minidrivers may need to do this when the MTU changes 767 768 void usbnet_unlink_rx_urbs(struct usbnet *dev) 769 { 770 if (netif_running(dev->net)) { 771 (void) unlink_urbs (dev, &dev->rxq); 772 tasklet_schedule(&dev->bh); 773 } 774 } 775 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); 776 777 /*-------------------------------------------------------------------------*/ 778 779 static void wait_skb_queue_empty(struct sk_buff_head *q) 780 { 781 unsigned long flags; 782 783 spin_lock_irqsave(&q->lock, flags); 784 while (!skb_queue_empty(q)) { 785 spin_unlock_irqrestore(&q->lock, flags); 786 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS)); 787 set_current_state(TASK_UNINTERRUPTIBLE); 788 spin_lock_irqsave(&q->lock, flags); 789 } 790 spin_unlock_irqrestore(&q->lock, flags); 791 } 792 793 // precondition: never called in_interrupt 794 static void usbnet_terminate_urbs(struct usbnet *dev) 795 { 796 DECLARE_WAITQUEUE(wait, current); 797 int temp; 798 799 /* ensure there are no more active urbs */ 800 add_wait_queue(&dev->wait, &wait); 801 set_current_state(TASK_UNINTERRUPTIBLE); 802 temp = unlink_urbs(dev, &dev->txq) + 803 unlink_urbs(dev, &dev->rxq); 804 805 /* maybe wait for deletions to finish. */ 806 wait_skb_queue_empty(&dev->rxq); 807 wait_skb_queue_empty(&dev->txq); 808 wait_skb_queue_empty(&dev->done); 809 netif_dbg(dev, ifdown, dev->net, 810 "waited for %d urb completions\n", temp); 811 set_current_state(TASK_RUNNING); 812 remove_wait_queue(&dev->wait, &wait); 813 } 814 815 int usbnet_stop (struct net_device *net) 816 { 817 struct usbnet *dev = netdev_priv(net); 818 const struct driver_info *info = dev->driver_info; 819 int retval, pm, mpn; 820 821 clear_bit(EVENT_DEV_OPEN, &dev->flags); 822 netif_stop_queue (net); 823 824 netif_info(dev, ifdown, dev->net, 825 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n", 826 net->stats.rx_packets, net->stats.tx_packets, 827 net->stats.rx_errors, net->stats.tx_errors); 828 829 /* to not race resume */ 830 pm = usb_autopm_get_interface(dev->intf); 831 /* allow minidriver to stop correctly (wireless devices to turn off 832 * radio etc) */ 833 if (info->stop) { 834 retval = info->stop(dev); 835 if (retval < 0) 836 netif_info(dev, ifdown, dev->net, 837 "stop fail (%d) usbnet usb-%s-%s, %s\n", 838 retval, 839 dev->udev->bus->bus_name, dev->udev->devpath, 840 info->description); 841 } 842 843 if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) 844 usbnet_terminate_urbs(dev); 845 846 usbnet_status_stop(dev); 847 848 usbnet_purge_paused_rxq(dev); 849 850 mpn = !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags); 851 852 /* deferred work (task, timer, softirq) must also stop. 853 * can't flush_scheduled_work() until we drop rtnl (later), 854 * else workers could deadlock; so make workers a NOP. 855 */ 856 dev->flags = 0; 857 del_timer_sync (&dev->delay); 858 tasklet_kill (&dev->bh); 859 if (!pm) 860 usb_autopm_put_interface(dev->intf); 861 862 if (info->manage_power && mpn) 863 info->manage_power(dev, 0); 864 else 865 usb_autopm_put_interface(dev->intf); 866 867 return 0; 868 } 869 EXPORT_SYMBOL_GPL(usbnet_stop); 870 871 /*-------------------------------------------------------------------------*/ 872 873 // posts reads, and enables write queuing 874 875 // precondition: never called in_interrupt 876 877 int usbnet_open (struct net_device *net) 878 { 879 struct usbnet *dev = netdev_priv(net); 880 int retval; 881 const struct driver_info *info = dev->driver_info; 882 883 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { 884 netif_info(dev, ifup, dev->net, 885 "resumption fail (%d) usbnet usb-%s-%s, %s\n", 886 retval, 887 dev->udev->bus->bus_name, 888 dev->udev->devpath, 889 info->description); 890 goto done_nopm; 891 } 892 893 // put into "known safe" state 894 if (info->reset && (retval = info->reset (dev)) < 0) { 895 netif_info(dev, ifup, dev->net, 896 "open reset fail (%d) usbnet usb-%s-%s, %s\n", 897 retval, 898 dev->udev->bus->bus_name, 899 dev->udev->devpath, 900 info->description); 901 goto done; 902 } 903 904 /* hard_mtu or rx_urb_size may change in reset() */ 905 usbnet_update_max_qlen(dev); 906 907 // insist peer be connected 908 if (info->check_connect && (retval = info->check_connect (dev)) < 0) { 909 netif_err(dev, ifup, dev->net, "can't open; %d\n", retval); 910 goto done; 911 } 912 913 /* start any status interrupt transfer */ 914 if (dev->interrupt) { 915 retval = usbnet_status_start(dev, GFP_KERNEL); 916 if (retval < 0) { 917 netif_err(dev, ifup, dev->net, 918 "intr submit %d\n", retval); 919 goto done; 920 } 921 } 922 923 set_bit(EVENT_DEV_OPEN, &dev->flags); 924 netif_start_queue (net); 925 netif_info(dev, ifup, dev->net, 926 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n", 927 (int)RX_QLEN(dev), (int)TX_QLEN(dev), 928 dev->net->mtu, 929 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" : 930 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" : 931 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" : 932 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" : 933 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" : 934 "simple"); 935 936 /* reset rx error state */ 937 dev->pkt_cnt = 0; 938 dev->pkt_err = 0; 939 clear_bit(EVENT_RX_KILL, &dev->flags); 940 941 // delay posting reads until we're fully open 942 tasklet_schedule (&dev->bh); 943 if (info->manage_power) { 944 retval = info->manage_power(dev, 1); 945 if (retval < 0) { 946 retval = 0; 947 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags); 948 } else { 949 usb_autopm_put_interface(dev->intf); 950 } 951 } 952 return retval; 953 done: 954 usb_autopm_put_interface(dev->intf); 955 done_nopm: 956 return retval; 957 } 958 EXPORT_SYMBOL_GPL(usbnet_open); 959 960 /*-------------------------------------------------------------------------*/ 961 962 /* ethtool methods; minidrivers may need to add some more, but 963 * they'll probably want to use this base set. 964 */ 965 966 /* These methods are written on the assumption that the device 967 * uses MII 968 */ 969 int usbnet_get_link_ksettings_mii(struct net_device *net, 970 struct ethtool_link_ksettings *cmd) 971 { 972 struct usbnet *dev = netdev_priv(net); 973 974 if (!dev->mii.mdio_read) 975 return -EOPNOTSUPP; 976 977 mii_ethtool_get_link_ksettings(&dev->mii, cmd); 978 979 return 0; 980 } 981 EXPORT_SYMBOL_GPL(usbnet_get_link_ksettings_mii); 982 983 int usbnet_get_link_ksettings_internal(struct net_device *net, 984 struct ethtool_link_ksettings *cmd) 985 { 986 struct usbnet *dev = netdev_priv(net); 987 988 /* the assumption that speed is equal on tx and rx 989 * is deeply engrained into the networking layer. 990 * For wireless stuff it is not true. 991 * We assume that rx_speed matters more. 992 */ 993 if (dev->rx_speed != SPEED_UNSET) 994 cmd->base.speed = dev->rx_speed / 1000000; 995 else if (dev->tx_speed != SPEED_UNSET) 996 cmd->base.speed = dev->tx_speed / 1000000; 997 else 998 cmd->base.speed = SPEED_UNKNOWN; 999 1000 return 0; 1001 } 1002 EXPORT_SYMBOL_GPL(usbnet_get_link_ksettings_internal); 1003 1004 int usbnet_set_link_ksettings_mii(struct net_device *net, 1005 const struct ethtool_link_ksettings *cmd) 1006 { 1007 struct usbnet *dev = netdev_priv(net); 1008 int retval; 1009 1010 if (!dev->mii.mdio_write) 1011 return -EOPNOTSUPP; 1012 1013 retval = mii_ethtool_set_link_ksettings(&dev->mii, cmd); 1014 1015 /* link speed/duplex might have changed */ 1016 if (dev->driver_info->link_reset) 1017 dev->driver_info->link_reset(dev); 1018 1019 /* hard_mtu or rx_urb_size may change in link_reset() */ 1020 usbnet_update_max_qlen(dev); 1021 1022 return retval; 1023 } 1024 EXPORT_SYMBOL_GPL(usbnet_set_link_ksettings_mii); 1025 1026 u32 usbnet_get_link (struct net_device *net) 1027 { 1028 struct usbnet *dev = netdev_priv(net); 1029 1030 /* If a check_connect is defined, return its result */ 1031 if (dev->driver_info->check_connect) 1032 return dev->driver_info->check_connect (dev) == 0; 1033 1034 /* if the device has mii operations, use those */ 1035 if (dev->mii.mdio_read) 1036 return mii_link_ok(&dev->mii); 1037 1038 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ 1039 return ethtool_op_get_link(net); 1040 } 1041 EXPORT_SYMBOL_GPL(usbnet_get_link); 1042 1043 int usbnet_nway_reset(struct net_device *net) 1044 { 1045 struct usbnet *dev = netdev_priv(net); 1046 1047 if (!dev->mii.mdio_write) 1048 return -EOPNOTSUPP; 1049 1050 return mii_nway_restart(&dev->mii); 1051 } 1052 EXPORT_SYMBOL_GPL(usbnet_nway_reset); 1053 1054 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) 1055 { 1056 struct usbnet *dev = netdev_priv(net); 1057 1058 strlcpy (info->driver, dev->driver_name, sizeof info->driver); 1059 strlcpy (info->fw_version, dev->driver_info->description, 1060 sizeof info->fw_version); 1061 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); 1062 } 1063 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); 1064 1065 u32 usbnet_get_msglevel (struct net_device *net) 1066 { 1067 struct usbnet *dev = netdev_priv(net); 1068 1069 return dev->msg_enable; 1070 } 1071 EXPORT_SYMBOL_GPL(usbnet_get_msglevel); 1072 1073 void usbnet_set_msglevel (struct net_device *net, u32 level) 1074 { 1075 struct usbnet *dev = netdev_priv(net); 1076 1077 dev->msg_enable = level; 1078 } 1079 EXPORT_SYMBOL_GPL(usbnet_set_msglevel); 1080 1081 /* drivers may override default ethtool_ops in their bind() routine */ 1082 static const struct ethtool_ops usbnet_ethtool_ops = { 1083 .get_link = usbnet_get_link, 1084 .nway_reset = usbnet_nway_reset, 1085 .get_drvinfo = usbnet_get_drvinfo, 1086 .get_msglevel = usbnet_get_msglevel, 1087 .set_msglevel = usbnet_set_msglevel, 1088 .get_ts_info = ethtool_op_get_ts_info, 1089 .get_link_ksettings = usbnet_get_link_ksettings_mii, 1090 .set_link_ksettings = usbnet_set_link_ksettings_mii, 1091 }; 1092 1093 /*-------------------------------------------------------------------------*/ 1094 1095 static void __handle_link_change(struct usbnet *dev) 1096 { 1097 if (!test_bit(EVENT_DEV_OPEN, &dev->flags)) 1098 return; 1099 1100 if (!netif_carrier_ok(dev->net)) { 1101 /* kill URBs for reading packets to save bus bandwidth */ 1102 unlink_urbs(dev, &dev->rxq); 1103 1104 /* 1105 * tx_timeout will unlink URBs for sending packets and 1106 * tx queue is stopped by netcore after link becomes off 1107 */ 1108 } else { 1109 /* submitting URBs for reading packets */ 1110 tasklet_schedule(&dev->bh); 1111 } 1112 1113 /* hard_mtu or rx_urb_size may change during link change */ 1114 usbnet_update_max_qlen(dev); 1115 1116 clear_bit(EVENT_LINK_CHANGE, &dev->flags); 1117 } 1118 1119 void usbnet_set_rx_mode(struct net_device *net) 1120 { 1121 struct usbnet *dev = netdev_priv(net); 1122 1123 usbnet_defer_kevent(dev, EVENT_SET_RX_MODE); 1124 } 1125 EXPORT_SYMBOL_GPL(usbnet_set_rx_mode); 1126 1127 static void __handle_set_rx_mode(struct usbnet *dev) 1128 { 1129 if (dev->driver_info->set_rx_mode) 1130 (dev->driver_info->set_rx_mode)(dev); 1131 1132 clear_bit(EVENT_SET_RX_MODE, &dev->flags); 1133 } 1134 1135 /* work that cannot be done in interrupt context uses keventd. 1136 * 1137 * NOTE: with 2.5 we could do more of this using completion callbacks, 1138 * especially now that control transfers can be queued. 1139 */ 1140 static void 1141 usbnet_deferred_kevent (struct work_struct *work) 1142 { 1143 struct usbnet *dev = 1144 container_of(work, struct usbnet, kevent); 1145 int status; 1146 1147 /* usb_clear_halt() needs a thread context */ 1148 if (test_bit (EVENT_TX_HALT, &dev->flags)) { 1149 unlink_urbs (dev, &dev->txq); 1150 status = usb_autopm_get_interface(dev->intf); 1151 if (status < 0) 1152 goto fail_pipe; 1153 status = usb_clear_halt (dev->udev, dev->out); 1154 usb_autopm_put_interface(dev->intf); 1155 if (status < 0 && 1156 status != -EPIPE && 1157 status != -ESHUTDOWN) { 1158 if (netif_msg_tx_err (dev)) 1159 fail_pipe: 1160 netdev_err(dev->net, "can't clear tx halt, status %d\n", 1161 status); 1162 } else { 1163 clear_bit (EVENT_TX_HALT, &dev->flags); 1164 if (status != -ESHUTDOWN) 1165 netif_wake_queue (dev->net); 1166 } 1167 } 1168 if (test_bit (EVENT_RX_HALT, &dev->flags)) { 1169 unlink_urbs (dev, &dev->rxq); 1170 status = usb_autopm_get_interface(dev->intf); 1171 if (status < 0) 1172 goto fail_halt; 1173 status = usb_clear_halt (dev->udev, dev->in); 1174 usb_autopm_put_interface(dev->intf); 1175 if (status < 0 && 1176 status != -EPIPE && 1177 status != -ESHUTDOWN) { 1178 if (netif_msg_rx_err (dev)) 1179 fail_halt: 1180 netdev_err(dev->net, "can't clear rx halt, status %d\n", 1181 status); 1182 } else { 1183 clear_bit (EVENT_RX_HALT, &dev->flags); 1184 tasklet_schedule (&dev->bh); 1185 } 1186 } 1187 1188 /* tasklet could resubmit itself forever if memory is tight */ 1189 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { 1190 struct urb *urb = NULL; 1191 int resched = 1; 1192 1193 if (netif_running (dev->net)) 1194 urb = usb_alloc_urb (0, GFP_KERNEL); 1195 else 1196 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1197 if (urb != NULL) { 1198 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1199 status = usb_autopm_get_interface(dev->intf); 1200 if (status < 0) { 1201 usb_free_urb(urb); 1202 goto fail_lowmem; 1203 } 1204 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) 1205 resched = 0; 1206 usb_autopm_put_interface(dev->intf); 1207 fail_lowmem: 1208 if (resched) 1209 tasklet_schedule (&dev->bh); 1210 } 1211 } 1212 1213 if (test_bit (EVENT_LINK_RESET, &dev->flags)) { 1214 const struct driver_info *info = dev->driver_info; 1215 int retval = 0; 1216 1217 clear_bit (EVENT_LINK_RESET, &dev->flags); 1218 status = usb_autopm_get_interface(dev->intf); 1219 if (status < 0) 1220 goto skip_reset; 1221 if(info->link_reset && (retval = info->link_reset(dev)) < 0) { 1222 usb_autopm_put_interface(dev->intf); 1223 skip_reset: 1224 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", 1225 retval, 1226 dev->udev->bus->bus_name, 1227 dev->udev->devpath, 1228 info->description); 1229 } else { 1230 usb_autopm_put_interface(dev->intf); 1231 } 1232 1233 /* handle link change from link resetting */ 1234 __handle_link_change(dev); 1235 } 1236 1237 if (test_bit (EVENT_LINK_CHANGE, &dev->flags)) 1238 __handle_link_change(dev); 1239 1240 if (test_bit (EVENT_SET_RX_MODE, &dev->flags)) 1241 __handle_set_rx_mode(dev); 1242 1243 1244 if (dev->flags) 1245 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); 1246 } 1247 1248 /*-------------------------------------------------------------------------*/ 1249 1250 static void tx_complete (struct urb *urb) 1251 { 1252 struct sk_buff *skb = (struct sk_buff *) urb->context; 1253 struct skb_data *entry = (struct skb_data *) skb->cb; 1254 struct usbnet *dev = entry->dev; 1255 1256 if (urb->status == 0) { 1257 struct pcpu_sw_netstats *stats64 = this_cpu_ptr(dev->net->tstats); 1258 unsigned long flags; 1259 1260 flags = u64_stats_update_begin_irqsave(&stats64->syncp); 1261 stats64->tx_packets += entry->packets; 1262 stats64->tx_bytes += entry->length; 1263 u64_stats_update_end_irqrestore(&stats64->syncp, flags); 1264 } else { 1265 dev->net->stats.tx_errors++; 1266 1267 switch (urb->status) { 1268 case -EPIPE: 1269 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1270 break; 1271 1272 /* software-driven interface shutdown */ 1273 case -ECONNRESET: // async unlink 1274 case -ESHUTDOWN: // hardware gone 1275 break; 1276 1277 /* like rx, tx gets controller i/o faults during hub_wq 1278 * delays and so it uses the same throttling mechanism. 1279 */ 1280 case -EPROTO: 1281 case -ETIME: 1282 case -EILSEQ: 1283 usb_mark_last_busy(dev->udev); 1284 if (!timer_pending (&dev->delay)) { 1285 mod_timer (&dev->delay, 1286 jiffies + THROTTLE_JIFFIES); 1287 netif_dbg(dev, link, dev->net, 1288 "tx throttle %d\n", urb->status); 1289 } 1290 netif_stop_queue (dev->net); 1291 break; 1292 default: 1293 netif_dbg(dev, tx_err, dev->net, 1294 "tx err %d\n", entry->urb->status); 1295 break; 1296 } 1297 } 1298 1299 usb_autopm_put_interface_async(dev->intf); 1300 (void) defer_bh(dev, skb, &dev->txq, tx_done); 1301 } 1302 1303 /*-------------------------------------------------------------------------*/ 1304 1305 void usbnet_tx_timeout (struct net_device *net, unsigned int txqueue) 1306 { 1307 struct usbnet *dev = netdev_priv(net); 1308 1309 unlink_urbs (dev, &dev->txq); 1310 tasklet_schedule (&dev->bh); 1311 /* this needs to be handled individually because the generic layer 1312 * doesn't know what is sufficient and could not restore private 1313 * information if a remedy of an unconditional reset were used. 1314 */ 1315 if (dev->driver_info->recover) 1316 (dev->driver_info->recover)(dev); 1317 } 1318 EXPORT_SYMBOL_GPL(usbnet_tx_timeout); 1319 1320 /*-------------------------------------------------------------------------*/ 1321 1322 static int build_dma_sg(const struct sk_buff *skb, struct urb *urb) 1323 { 1324 unsigned num_sgs, total_len = 0; 1325 int i, s = 0; 1326 1327 num_sgs = skb_shinfo(skb)->nr_frags + 1; 1328 if (num_sgs == 1) 1329 return 0; 1330 1331 /* reserve one for zero packet */ 1332 urb->sg = kmalloc_array(num_sgs + 1, sizeof(struct scatterlist), 1333 GFP_ATOMIC); 1334 if (!urb->sg) 1335 return -ENOMEM; 1336 1337 urb->num_sgs = num_sgs; 1338 sg_init_table(urb->sg, urb->num_sgs + 1); 1339 1340 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb)); 1341 total_len += skb_headlen(skb); 1342 1343 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1344 skb_frag_t *f = &skb_shinfo(skb)->frags[i]; 1345 1346 total_len += skb_frag_size(f); 1347 sg_set_page(&urb->sg[i + s], skb_frag_page(f), skb_frag_size(f), 1348 skb_frag_off(f)); 1349 } 1350 urb->transfer_buffer_length = total_len; 1351 1352 return 1; 1353 } 1354 1355 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, 1356 struct net_device *net) 1357 { 1358 struct usbnet *dev = netdev_priv(net); 1359 unsigned int length; 1360 struct urb *urb = NULL; 1361 struct skb_data *entry; 1362 const struct driver_info *info = dev->driver_info; 1363 unsigned long flags; 1364 int retval; 1365 1366 if (skb) 1367 skb_tx_timestamp(skb); 1368 1369 // some devices want funky USB-level framing, for 1370 // win32 driver (usually) and/or hardware quirks 1371 if (info->tx_fixup) { 1372 skb = info->tx_fixup (dev, skb, GFP_ATOMIC); 1373 if (!skb) { 1374 /* packet collected; minidriver waiting for more */ 1375 if (info->flags & FLAG_MULTI_PACKET) 1376 goto not_drop; 1377 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); 1378 goto drop; 1379 } 1380 } 1381 1382 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { 1383 netif_dbg(dev, tx_err, dev->net, "no urb\n"); 1384 goto drop; 1385 } 1386 1387 entry = (struct skb_data *) skb->cb; 1388 entry->urb = urb; 1389 entry->dev = dev; 1390 1391 usb_fill_bulk_urb (urb, dev->udev, dev->out, 1392 skb->data, skb->len, tx_complete, skb); 1393 if (dev->can_dma_sg) { 1394 if (build_dma_sg(skb, urb) < 0) 1395 goto drop; 1396 } 1397 length = urb->transfer_buffer_length; 1398 1399 /* don't assume the hardware handles USB_ZERO_PACKET 1400 * NOTE: strictly conforming cdc-ether devices should expect 1401 * the ZLP here, but ignore the one-byte packet. 1402 * NOTE2: CDC NCM specification is different from CDC ECM when 1403 * handling ZLP/short packets, so cdc_ncm driver will make short 1404 * packet itself if needed. 1405 */ 1406 if (length % dev->maxpacket == 0) { 1407 if (!(info->flags & FLAG_SEND_ZLP)) { 1408 if (!(info->flags & FLAG_MULTI_PACKET)) { 1409 length++; 1410 if (skb_tailroom(skb) && !urb->num_sgs) { 1411 skb->data[skb->len] = 0; 1412 __skb_put(skb, 1); 1413 } else if (urb->num_sgs) 1414 sg_set_buf(&urb->sg[urb->num_sgs++], 1415 dev->padding_pkt, 1); 1416 } 1417 } else 1418 urb->transfer_flags |= URB_ZERO_PACKET; 1419 } 1420 urb->transfer_buffer_length = length; 1421 1422 if (info->flags & FLAG_MULTI_PACKET) { 1423 /* Driver has set number of packets and a length delta. 1424 * Calculate the complete length and ensure that it's 1425 * positive. 1426 */ 1427 entry->length += length; 1428 if (WARN_ON_ONCE(entry->length <= 0)) 1429 entry->length = length; 1430 } else { 1431 usbnet_set_skb_tx_stats(skb, 1, length); 1432 } 1433 1434 spin_lock_irqsave(&dev->txq.lock, flags); 1435 retval = usb_autopm_get_interface_async(dev->intf); 1436 if (retval < 0) { 1437 spin_unlock_irqrestore(&dev->txq.lock, flags); 1438 goto drop; 1439 } 1440 if (netif_queue_stopped(net)) { 1441 usb_autopm_put_interface_async(dev->intf); 1442 spin_unlock_irqrestore(&dev->txq.lock, flags); 1443 goto drop; 1444 } 1445 1446 #ifdef CONFIG_PM 1447 /* if this triggers the device is still a sleep */ 1448 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { 1449 /* transmission will be done in resume */ 1450 usb_anchor_urb(urb, &dev->deferred); 1451 /* no use to process more packets */ 1452 netif_stop_queue(net); 1453 usb_put_urb(urb); 1454 spin_unlock_irqrestore(&dev->txq.lock, flags); 1455 netdev_dbg(dev->net, "Delaying transmission for resumption\n"); 1456 goto deferred; 1457 } 1458 #endif 1459 1460 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { 1461 case -EPIPE: 1462 netif_stop_queue (net); 1463 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1464 usb_autopm_put_interface_async(dev->intf); 1465 break; 1466 default: 1467 usb_autopm_put_interface_async(dev->intf); 1468 netif_dbg(dev, tx_err, dev->net, 1469 "tx: submit urb err %d\n", retval); 1470 break; 1471 case 0: 1472 netif_trans_update(net); 1473 __usbnet_queue_skb(&dev->txq, skb, tx_start); 1474 if (dev->txq.qlen >= TX_QLEN (dev)) 1475 netif_stop_queue (net); 1476 } 1477 spin_unlock_irqrestore (&dev->txq.lock, flags); 1478 1479 if (retval) { 1480 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); 1481 drop: 1482 dev->net->stats.tx_dropped++; 1483 not_drop: 1484 if (skb) 1485 dev_kfree_skb_any (skb); 1486 if (urb) { 1487 kfree(urb->sg); 1488 usb_free_urb(urb); 1489 } 1490 } else 1491 netif_dbg(dev, tx_queued, dev->net, 1492 "> tx, len %u, type 0x%x\n", length, skb->protocol); 1493 #ifdef CONFIG_PM 1494 deferred: 1495 #endif 1496 return NETDEV_TX_OK; 1497 } 1498 EXPORT_SYMBOL_GPL(usbnet_start_xmit); 1499 1500 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags) 1501 { 1502 struct urb *urb; 1503 int i; 1504 int ret = 0; 1505 1506 /* don't refill the queue all at once */ 1507 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) { 1508 urb = usb_alloc_urb(0, flags); 1509 if (urb != NULL) { 1510 ret = rx_submit(dev, urb, flags); 1511 if (ret) 1512 goto err; 1513 } else { 1514 ret = -ENOMEM; 1515 goto err; 1516 } 1517 } 1518 err: 1519 return ret; 1520 } 1521 1522 /*-------------------------------------------------------------------------*/ 1523 1524 // tasklet (work deferred from completions, in_irq) or timer 1525 1526 static void usbnet_bh (struct timer_list *t) 1527 { 1528 struct usbnet *dev = from_timer(dev, t, delay); 1529 struct sk_buff *skb; 1530 struct skb_data *entry; 1531 1532 while ((skb = skb_dequeue (&dev->done))) { 1533 entry = (struct skb_data *) skb->cb; 1534 switch (entry->state) { 1535 case rx_done: 1536 entry->state = rx_cleanup; 1537 rx_process (dev, skb); 1538 continue; 1539 case tx_done: 1540 kfree(entry->urb->sg); 1541 fallthrough; 1542 case rx_cleanup: 1543 usb_free_urb (entry->urb); 1544 dev_kfree_skb (skb); 1545 continue; 1546 default: 1547 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); 1548 } 1549 } 1550 1551 /* restart RX again after disabling due to high error rate */ 1552 clear_bit(EVENT_RX_KILL, &dev->flags); 1553 1554 /* waiting for all pending urbs to complete? 1555 * only then can we forgo submitting anew 1556 */ 1557 if (waitqueue_active(&dev->wait)) { 1558 if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0) 1559 wake_up_all(&dev->wait); 1560 1561 // or are we maybe short a few urbs? 1562 } else if (netif_running (dev->net) && 1563 netif_device_present (dev->net) && 1564 netif_carrier_ok(dev->net) && 1565 !timer_pending(&dev->delay) && 1566 !test_bit(EVENT_RX_PAUSED, &dev->flags) && 1567 !test_bit(EVENT_RX_HALT, &dev->flags)) { 1568 int temp = dev->rxq.qlen; 1569 1570 if (temp < RX_QLEN(dev)) { 1571 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK) 1572 return; 1573 if (temp != dev->rxq.qlen) 1574 netif_dbg(dev, link, dev->net, 1575 "rxqlen %d --> %d\n", 1576 temp, dev->rxq.qlen); 1577 if (dev->rxq.qlen < RX_QLEN(dev)) 1578 tasklet_schedule (&dev->bh); 1579 } 1580 if (dev->txq.qlen < TX_QLEN (dev)) 1581 netif_wake_queue (dev->net); 1582 } 1583 } 1584 1585 static void usbnet_bh_tasklet(struct tasklet_struct *t) 1586 { 1587 struct usbnet *dev = from_tasklet(dev, t, bh); 1588 1589 usbnet_bh(&dev->delay); 1590 } 1591 1592 1593 /*------------------------------------------------------------------------- 1594 * 1595 * USB Device Driver support 1596 * 1597 *-------------------------------------------------------------------------*/ 1598 1599 // precondition: never called in_interrupt 1600 1601 void usbnet_disconnect (struct usb_interface *intf) 1602 { 1603 struct usbnet *dev; 1604 struct usb_device *xdev; 1605 struct net_device *net; 1606 1607 dev = usb_get_intfdata(intf); 1608 usb_set_intfdata(intf, NULL); 1609 if (!dev) 1610 return; 1611 1612 xdev = interface_to_usbdev (intf); 1613 1614 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", 1615 intf->dev.driver->name, 1616 xdev->bus->bus_name, xdev->devpath, 1617 dev->driver_info->description); 1618 1619 if (dev->driver_info->unbind) 1620 dev->driver_info->unbind(dev, intf); 1621 1622 net = dev->net; 1623 unregister_netdev (net); 1624 1625 cancel_work_sync(&dev->kevent); 1626 1627 usb_scuttle_anchored_urbs(&dev->deferred); 1628 1629 usb_kill_urb(dev->interrupt); 1630 usb_free_urb(dev->interrupt); 1631 kfree(dev->padding_pkt); 1632 1633 free_percpu(net->tstats); 1634 free_netdev(net); 1635 } 1636 EXPORT_SYMBOL_GPL(usbnet_disconnect); 1637 1638 static const struct net_device_ops usbnet_netdev_ops = { 1639 .ndo_open = usbnet_open, 1640 .ndo_stop = usbnet_stop, 1641 .ndo_start_xmit = usbnet_start_xmit, 1642 .ndo_tx_timeout = usbnet_tx_timeout, 1643 .ndo_set_rx_mode = usbnet_set_rx_mode, 1644 .ndo_change_mtu = usbnet_change_mtu, 1645 .ndo_get_stats64 = dev_get_tstats64, 1646 .ndo_set_mac_address = eth_mac_addr, 1647 .ndo_validate_addr = eth_validate_addr, 1648 }; 1649 1650 /*-------------------------------------------------------------------------*/ 1651 1652 // precondition: never called in_interrupt 1653 1654 static struct device_type wlan_type = { 1655 .name = "wlan", 1656 }; 1657 1658 static struct device_type wwan_type = { 1659 .name = "wwan", 1660 }; 1661 1662 int 1663 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) 1664 { 1665 struct usbnet *dev; 1666 struct net_device *net; 1667 struct usb_host_interface *interface; 1668 const struct driver_info *info; 1669 struct usb_device *xdev; 1670 int status; 1671 const char *name; 1672 struct usb_driver *driver = to_usb_driver(udev->dev.driver); 1673 1674 /* usbnet already took usb runtime pm, so have to enable the feature 1675 * for usb interface, otherwise usb_autopm_get_interface may return 1676 * failure if RUNTIME_PM is enabled. 1677 */ 1678 if (!driver->supports_autosuspend) { 1679 driver->supports_autosuspend = 1; 1680 pm_runtime_enable(&udev->dev); 1681 } 1682 1683 name = udev->dev.driver->name; 1684 info = (const struct driver_info *) prod->driver_info; 1685 if (!info) { 1686 dev_dbg (&udev->dev, "blacklisted by %s\n", name); 1687 return -ENODEV; 1688 } 1689 xdev = interface_to_usbdev (udev); 1690 interface = udev->cur_altsetting; 1691 1692 status = -ENOMEM; 1693 1694 // set up our own records 1695 net = alloc_etherdev(sizeof(*dev)); 1696 if (!net) 1697 goto out; 1698 1699 /* netdev_printk() needs this so do it as early as possible */ 1700 SET_NETDEV_DEV(net, &udev->dev); 1701 1702 dev = netdev_priv(net); 1703 dev->udev = xdev; 1704 dev->intf = udev; 1705 dev->driver_info = info; 1706 dev->driver_name = name; 1707 dev->rx_speed = SPEED_UNSET; 1708 dev->tx_speed = SPEED_UNSET; 1709 1710 net->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1711 if (!net->tstats) 1712 goto out0; 1713 1714 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV 1715 | NETIF_MSG_PROBE | NETIF_MSG_LINK); 1716 init_waitqueue_head(&dev->wait); 1717 skb_queue_head_init (&dev->rxq); 1718 skb_queue_head_init (&dev->txq); 1719 skb_queue_head_init (&dev->done); 1720 skb_queue_head_init(&dev->rxq_pause); 1721 tasklet_setup(&dev->bh, usbnet_bh_tasklet); 1722 INIT_WORK (&dev->kevent, usbnet_deferred_kevent); 1723 init_usb_anchor(&dev->deferred); 1724 timer_setup(&dev->delay, usbnet_bh, 0); 1725 mutex_init (&dev->phy_mutex); 1726 mutex_init(&dev->interrupt_mutex); 1727 dev->interrupt_count = 0; 1728 1729 dev->net = net; 1730 strscpy(net->name, "usb%d", sizeof(net->name)); 1731 eth_hw_addr_set(net, node_id); 1732 1733 /* rx and tx sides can use different message sizes; 1734 * bind() should set rx_urb_size in that case. 1735 */ 1736 dev->hard_mtu = net->mtu + net->hard_header_len; 1737 net->min_mtu = 0; 1738 net->max_mtu = ETH_MAX_MTU; 1739 1740 net->netdev_ops = &usbnet_netdev_ops; 1741 net->watchdog_timeo = TX_TIMEOUT_JIFFIES; 1742 net->ethtool_ops = &usbnet_ethtool_ops; 1743 1744 // allow device-specific bind/init procedures 1745 // NOTE net->name still not usable ... 1746 if (info->bind) { 1747 status = info->bind (dev, udev); 1748 if (status < 0) 1749 goto out1; 1750 1751 // heuristic: "usb%d" for links we know are two-host, 1752 // else "eth%d" when there's reasonable doubt. userspace 1753 // can rename the link if it knows better. 1754 if ((dev->driver_info->flags & FLAG_ETHER) != 0 && 1755 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 || 1756 (net->dev_addr [0] & 0x02) == 0)) 1757 strscpy(net->name, "eth%d", sizeof(net->name)); 1758 /* WLAN devices should always be named "wlan%d" */ 1759 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1760 strscpy(net->name, "wlan%d", sizeof(net->name)); 1761 /* WWAN devices should always be named "wwan%d" */ 1762 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1763 strscpy(net->name, "wwan%d", sizeof(net->name)); 1764 1765 /* devices that cannot do ARP */ 1766 if ((dev->driver_info->flags & FLAG_NOARP) != 0) 1767 net->flags |= IFF_NOARP; 1768 1769 /* maybe the remote can't receive an Ethernet MTU */ 1770 if (net->mtu > (dev->hard_mtu - net->hard_header_len)) 1771 net->mtu = dev->hard_mtu - net->hard_header_len; 1772 } else if (!info->in || !info->out) 1773 status = usbnet_get_endpoints (dev, udev); 1774 else { 1775 dev->in = usb_rcvbulkpipe (xdev, info->in); 1776 dev->out = usb_sndbulkpipe (xdev, info->out); 1777 if (!(info->flags & FLAG_NO_SETINT)) 1778 status = usb_set_interface (xdev, 1779 interface->desc.bInterfaceNumber, 1780 interface->desc.bAlternateSetting); 1781 else 1782 status = 0; 1783 1784 } 1785 if (status >= 0 && dev->status) 1786 status = init_status (dev, udev); 1787 if (status < 0) 1788 goto out3; 1789 1790 if (!dev->rx_urb_size) 1791 dev->rx_urb_size = dev->hard_mtu; 1792 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); 1793 if (dev->maxpacket == 0) { 1794 /* that is a broken device */ 1795 status = -ENODEV; 1796 goto out4; 1797 } 1798 1799 /* let userspace know we have a random address */ 1800 if (ether_addr_equal(net->dev_addr, node_id)) 1801 net->addr_assign_type = NET_ADDR_RANDOM; 1802 1803 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1804 SET_NETDEV_DEVTYPE(net, &wlan_type); 1805 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1806 SET_NETDEV_DEVTYPE(net, &wwan_type); 1807 1808 /* initialize max rx_qlen and tx_qlen */ 1809 usbnet_update_max_qlen(dev); 1810 1811 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) && 1812 !(info->flags & FLAG_MULTI_PACKET)) { 1813 dev->padding_pkt = kzalloc(1, GFP_KERNEL); 1814 if (!dev->padding_pkt) { 1815 status = -ENOMEM; 1816 goto out4; 1817 } 1818 } 1819 1820 status = register_netdev (net); 1821 if (status) 1822 goto out5; 1823 netif_info(dev, probe, dev->net, 1824 "register '%s' at usb-%s-%s, %s, %pM\n", 1825 udev->dev.driver->name, 1826 xdev->bus->bus_name, xdev->devpath, 1827 dev->driver_info->description, 1828 net->dev_addr); 1829 1830 // ok, it's ready to go. 1831 usb_set_intfdata (udev, dev); 1832 1833 netif_device_attach (net); 1834 1835 if (dev->driver_info->flags & FLAG_LINK_INTR) 1836 usbnet_link_change(dev, 0, 0); 1837 1838 return 0; 1839 1840 out5: 1841 kfree(dev->padding_pkt); 1842 out4: 1843 usb_free_urb(dev->interrupt); 1844 out3: 1845 if (info->unbind) 1846 info->unbind (dev, udev); 1847 out1: 1848 /* subdrivers must undo all they did in bind() if they 1849 * fail it, but we may fail later and a deferred kevent 1850 * may trigger an error resubmitting itself and, worse, 1851 * schedule a timer. So we kill it all just in case. 1852 */ 1853 cancel_work_sync(&dev->kevent); 1854 del_timer_sync(&dev->delay); 1855 free_percpu(net->tstats); 1856 out0: 1857 free_netdev(net); 1858 out: 1859 return status; 1860 } 1861 EXPORT_SYMBOL_GPL(usbnet_probe); 1862 1863 /*-------------------------------------------------------------------------*/ 1864 1865 /* 1866 * suspend the whole driver as soon as the first interface is suspended 1867 * resume only when the last interface is resumed 1868 */ 1869 1870 int usbnet_suspend (struct usb_interface *intf, pm_message_t message) 1871 { 1872 struct usbnet *dev = usb_get_intfdata(intf); 1873 1874 if (!dev->suspend_count++) { 1875 spin_lock_irq(&dev->txq.lock); 1876 /* don't autosuspend while transmitting */ 1877 if (dev->txq.qlen && PMSG_IS_AUTO(message)) { 1878 dev->suspend_count--; 1879 spin_unlock_irq(&dev->txq.lock); 1880 return -EBUSY; 1881 } else { 1882 set_bit(EVENT_DEV_ASLEEP, &dev->flags); 1883 spin_unlock_irq(&dev->txq.lock); 1884 } 1885 /* 1886 * accelerate emptying of the rx and queues, to avoid 1887 * having everything error out. 1888 */ 1889 netif_device_detach (dev->net); 1890 usbnet_terminate_urbs(dev); 1891 __usbnet_status_stop_force(dev); 1892 1893 /* 1894 * reattach so runtime management can use and 1895 * wake the device 1896 */ 1897 netif_device_attach (dev->net); 1898 } 1899 return 0; 1900 } 1901 EXPORT_SYMBOL_GPL(usbnet_suspend); 1902 1903 int usbnet_resume (struct usb_interface *intf) 1904 { 1905 struct usbnet *dev = usb_get_intfdata(intf); 1906 struct sk_buff *skb; 1907 struct urb *res; 1908 int retval; 1909 1910 if (!--dev->suspend_count) { 1911 /* resume interrupt URB if it was previously submitted */ 1912 __usbnet_status_start_force(dev, GFP_NOIO); 1913 1914 spin_lock_irq(&dev->txq.lock); 1915 while ((res = usb_get_from_anchor(&dev->deferred))) { 1916 1917 skb = (struct sk_buff *)res->context; 1918 retval = usb_submit_urb(res, GFP_ATOMIC); 1919 if (retval < 0) { 1920 dev_kfree_skb_any(skb); 1921 kfree(res->sg); 1922 usb_free_urb(res); 1923 usb_autopm_put_interface_async(dev->intf); 1924 } else { 1925 netif_trans_update(dev->net); 1926 __skb_queue_tail(&dev->txq, skb); 1927 } 1928 } 1929 1930 smp_mb(); 1931 clear_bit(EVENT_DEV_ASLEEP, &dev->flags); 1932 spin_unlock_irq(&dev->txq.lock); 1933 1934 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) { 1935 /* handle remote wakeup ASAP 1936 * we cannot race against stop 1937 */ 1938 if (netif_device_present(dev->net) && 1939 !timer_pending(&dev->delay) && 1940 !test_bit(EVENT_RX_HALT, &dev->flags)) 1941 rx_alloc_submit(dev, GFP_NOIO); 1942 1943 if (!(dev->txq.qlen >= TX_QLEN(dev))) 1944 netif_tx_wake_all_queues(dev->net); 1945 tasklet_schedule (&dev->bh); 1946 } 1947 } 1948 1949 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) 1950 usb_autopm_get_interface_no_resume(intf); 1951 1952 return 0; 1953 } 1954 EXPORT_SYMBOL_GPL(usbnet_resume); 1955 1956 /* 1957 * Either a subdriver implements manage_power, then it is assumed to always 1958 * be ready to be suspended or it reports the readiness to be suspended 1959 * explicitly 1960 */ 1961 void usbnet_device_suggests_idle(struct usbnet *dev) 1962 { 1963 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) { 1964 dev->intf->needs_remote_wakeup = 1; 1965 usb_autopm_put_interface_async(dev->intf); 1966 } 1967 } 1968 EXPORT_SYMBOL(usbnet_device_suggests_idle); 1969 1970 /* 1971 * For devices that can do without special commands 1972 */ 1973 int usbnet_manage_power(struct usbnet *dev, int on) 1974 { 1975 dev->intf->needs_remote_wakeup = on; 1976 return 0; 1977 } 1978 EXPORT_SYMBOL(usbnet_manage_power); 1979 1980 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset) 1981 { 1982 /* update link after link is reseted */ 1983 if (link && !need_reset) 1984 netif_carrier_on(dev->net); 1985 else 1986 netif_carrier_off(dev->net); 1987 1988 if (need_reset && link) 1989 usbnet_defer_kevent(dev, EVENT_LINK_RESET); 1990 else 1991 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE); 1992 } 1993 EXPORT_SYMBOL(usbnet_link_change); 1994 1995 /*-------------------------------------------------------------------------*/ 1996 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1997 u16 value, u16 index, void *data, u16 size) 1998 { 1999 void *buf = NULL; 2000 int err = -ENOMEM; 2001 2002 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x" 2003 " value=0x%04x index=0x%04x size=%d\n", 2004 cmd, reqtype, value, index, size); 2005 2006 if (size) { 2007 buf = kmalloc(size, GFP_KERNEL); 2008 if (!buf) 2009 goto out; 2010 } 2011 2012 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), 2013 cmd, reqtype, value, index, buf, size, 2014 USB_CTRL_GET_TIMEOUT); 2015 if (err > 0 && err <= size) { 2016 if (data) 2017 memcpy(data, buf, err); 2018 else 2019 netdev_dbg(dev->net, 2020 "Huh? Data requested but thrown away.\n"); 2021 } 2022 kfree(buf); 2023 out: 2024 return err; 2025 } 2026 2027 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 2028 u16 value, u16 index, const void *data, 2029 u16 size) 2030 { 2031 void *buf = NULL; 2032 int err = -ENOMEM; 2033 2034 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 2035 " value=0x%04x index=0x%04x size=%d\n", 2036 cmd, reqtype, value, index, size); 2037 2038 if (data) { 2039 buf = kmemdup(data, size, GFP_KERNEL); 2040 if (!buf) 2041 goto out; 2042 } else { 2043 if (size) { 2044 WARN_ON_ONCE(1); 2045 err = -EINVAL; 2046 goto out; 2047 } 2048 } 2049 2050 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), 2051 cmd, reqtype, value, index, buf, size, 2052 USB_CTRL_SET_TIMEOUT); 2053 kfree(buf); 2054 2055 out: 2056 return err; 2057 } 2058 2059 /* 2060 * The function can't be called inside suspend/resume callback, 2061 * otherwise deadlock will be caused. 2062 */ 2063 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 2064 u16 value, u16 index, void *data, u16 size) 2065 { 2066 int ret; 2067 2068 if (usb_autopm_get_interface(dev->intf) < 0) 2069 return -ENODEV; 2070 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index, 2071 data, size); 2072 usb_autopm_put_interface(dev->intf); 2073 return ret; 2074 } 2075 EXPORT_SYMBOL_GPL(usbnet_read_cmd); 2076 2077 /* 2078 * The function can't be called inside suspend/resume callback, 2079 * otherwise deadlock will be caused. 2080 */ 2081 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 2082 u16 value, u16 index, const void *data, u16 size) 2083 { 2084 int ret; 2085 2086 if (usb_autopm_get_interface(dev->intf) < 0) 2087 return -ENODEV; 2088 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index, 2089 data, size); 2090 usb_autopm_put_interface(dev->intf); 2091 return ret; 2092 } 2093 EXPORT_SYMBOL_GPL(usbnet_write_cmd); 2094 2095 /* 2096 * The function can be called inside suspend/resume callback safely 2097 * and should only be called by suspend/resume callback generally. 2098 */ 2099 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 2100 u16 value, u16 index, void *data, u16 size) 2101 { 2102 return __usbnet_read_cmd(dev, cmd, reqtype, value, index, 2103 data, size); 2104 } 2105 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm); 2106 2107 /* 2108 * The function can be called inside suspend/resume callback safely 2109 * and should only be called by suspend/resume callback generally. 2110 */ 2111 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 2112 u16 value, u16 index, const void *data, 2113 u16 size) 2114 { 2115 return __usbnet_write_cmd(dev, cmd, reqtype, value, index, 2116 data, size); 2117 } 2118 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm); 2119 2120 static void usbnet_async_cmd_cb(struct urb *urb) 2121 { 2122 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context; 2123 int status = urb->status; 2124 2125 if (status < 0) 2126 dev_dbg(&urb->dev->dev, "%s failed with %d", 2127 __func__, status); 2128 2129 kfree(req); 2130 usb_free_urb(urb); 2131 } 2132 2133 /* 2134 * The caller must make sure that device can't be put into suspend 2135 * state until the control URB completes. 2136 */ 2137 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype, 2138 u16 value, u16 index, const void *data, u16 size) 2139 { 2140 struct usb_ctrlrequest *req = NULL; 2141 struct urb *urb; 2142 int err = -ENOMEM; 2143 void *buf = NULL; 2144 2145 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 2146 " value=0x%04x index=0x%04x size=%d\n", 2147 cmd, reqtype, value, index, size); 2148 2149 urb = usb_alloc_urb(0, GFP_ATOMIC); 2150 if (!urb) 2151 goto fail; 2152 2153 if (data) { 2154 buf = kmemdup(data, size, GFP_ATOMIC); 2155 if (!buf) { 2156 netdev_err(dev->net, "Error allocating buffer" 2157 " in %s!\n", __func__); 2158 goto fail_free; 2159 } 2160 } 2161 2162 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC); 2163 if (!req) 2164 goto fail_free_buf; 2165 2166 req->bRequestType = reqtype; 2167 req->bRequest = cmd; 2168 req->wValue = cpu_to_le16(value); 2169 req->wIndex = cpu_to_le16(index); 2170 req->wLength = cpu_to_le16(size); 2171 2172 usb_fill_control_urb(urb, dev->udev, 2173 usb_sndctrlpipe(dev->udev, 0), 2174 (void *)req, buf, size, 2175 usbnet_async_cmd_cb, req); 2176 urb->transfer_flags |= URB_FREE_BUFFER; 2177 2178 err = usb_submit_urb(urb, GFP_ATOMIC); 2179 if (err < 0) { 2180 netdev_err(dev->net, "Error submitting the control" 2181 " message: status=%d\n", err); 2182 goto fail_free; 2183 } 2184 return 0; 2185 2186 fail_free_buf: 2187 kfree(buf); 2188 fail_free: 2189 kfree(req); 2190 usb_free_urb(urb); 2191 fail: 2192 return err; 2193 2194 } 2195 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async); 2196 /*-------------------------------------------------------------------------*/ 2197 2198 static int __init usbnet_init(void) 2199 { 2200 /* Compiler should optimize this out. */ 2201 BUILD_BUG_ON( 2202 sizeof_field(struct sk_buff, cb) < sizeof(struct skb_data)); 2203 2204 eth_random_addr(node_id); 2205 return 0; 2206 } 2207 module_init(usbnet_init); 2208 2209 static void __exit usbnet_exit(void) 2210 { 2211 } 2212 module_exit(usbnet_exit); 2213 2214 MODULE_AUTHOR("David Brownell"); 2215 MODULE_DESCRIPTION("USB network driver framework"); 2216 MODULE_LICENSE("GPL"); 2217