1 /* 2 * USB Network driver infrastructure 3 * Copyright (C) 2000-2005 by David Brownell 4 * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 /* 21 * This is a generic "USB networking" framework that works with several 22 * kinds of full and high speed networking devices: host-to-host cables, 23 * smart usb peripherals, and actual Ethernet adapters. 24 * 25 * These devices usually differ in terms of control protocols (if they 26 * even have one!) and sometimes they define new framing to wrap or batch 27 * Ethernet packets. Otherwise, they talk to USB pretty much the same, 28 * so interface (un)binding, endpoint I/O queues, fault handling, and other 29 * issues can usefully be addressed by this framework. 30 */ 31 32 // #define DEBUG // error path messages, extra info 33 // #define VERBOSE // more; success messages 34 35 #include <linux/module.h> 36 #include <linux/init.h> 37 #include <linux/netdevice.h> 38 #include <linux/etherdevice.h> 39 #include <linux/ctype.h> 40 #include <linux/ethtool.h> 41 #include <linux/workqueue.h> 42 #include <linux/mii.h> 43 #include <linux/usb.h> 44 #include <linux/usb/usbnet.h> 45 #include <linux/slab.h> 46 #include <linux/kernel.h> 47 #include <linux/pm_runtime.h> 48 49 #define DRIVER_VERSION "22-Aug-2005" 50 51 52 /*-------------------------------------------------------------------------*/ 53 54 /* 55 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max. 56 * Several dozen bytes of IPv4 data can fit in two such transactions. 57 * One maximum size Ethernet packet takes twenty four of them. 58 * For high speed, each frame comfortably fits almost 36 max size 59 * Ethernet packets (so queues should be bigger). 60 * 61 * The goal is to let the USB host controller be busy for 5msec or 62 * more before an irq is required, under load. Jumbograms change 63 * the equation. 64 */ 65 #define MAX_QUEUE_MEMORY (60 * 1518) 66 #define RX_QLEN(dev) ((dev)->rx_qlen) 67 #define TX_QLEN(dev) ((dev)->tx_qlen) 68 69 // reawaken network queue this soon after stopping; else watchdog barks 70 #define TX_TIMEOUT_JIFFIES (5*HZ) 71 72 /* throttle rx/tx briefly after some faults, so hub_wq might disconnect() 73 * us (it polls at HZ/4 usually) before we report too many false errors. 74 */ 75 #define THROTTLE_JIFFIES (HZ/8) 76 77 // between wakeups 78 #define UNLINK_TIMEOUT_MS 3 79 80 /*-------------------------------------------------------------------------*/ 81 82 // randomly generated ethernet address 83 static u8 node_id [ETH_ALEN]; 84 85 /* use ethtool to change the level for any given device */ 86 static int msg_level = -1; 87 module_param (msg_level, int, 0); 88 MODULE_PARM_DESC (msg_level, "Override default message level"); 89 90 /*-------------------------------------------------------------------------*/ 91 92 /* handles CDC Ethernet and many other network "bulk data" interfaces */ 93 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf) 94 { 95 int tmp; 96 struct usb_host_interface *alt = NULL; 97 struct usb_host_endpoint *in = NULL, *out = NULL; 98 struct usb_host_endpoint *status = NULL; 99 100 for (tmp = 0; tmp < intf->num_altsetting; tmp++) { 101 unsigned ep; 102 103 in = out = status = NULL; 104 alt = intf->altsetting + tmp; 105 106 /* take the first altsetting with in-bulk + out-bulk; 107 * remember any status endpoint, just in case; 108 * ignore other endpoints and altsettings. 109 */ 110 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) { 111 struct usb_host_endpoint *e; 112 int intr = 0; 113 114 e = alt->endpoint + ep; 115 switch (e->desc.bmAttributes) { 116 case USB_ENDPOINT_XFER_INT: 117 if (!usb_endpoint_dir_in(&e->desc)) 118 continue; 119 intr = 1; 120 /* FALLTHROUGH */ 121 case USB_ENDPOINT_XFER_BULK: 122 break; 123 default: 124 continue; 125 } 126 if (usb_endpoint_dir_in(&e->desc)) { 127 if (!intr && !in) 128 in = e; 129 else if (intr && !status) 130 status = e; 131 } else { 132 if (!out) 133 out = e; 134 } 135 } 136 if (in && out) 137 break; 138 } 139 if (!alt || !in || !out) 140 return -EINVAL; 141 142 if (alt->desc.bAlternateSetting != 0 || 143 !(dev->driver_info->flags & FLAG_NO_SETINT)) { 144 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber, 145 alt->desc.bAlternateSetting); 146 if (tmp < 0) 147 return tmp; 148 } 149 150 dev->in = usb_rcvbulkpipe (dev->udev, 151 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 152 dev->out = usb_sndbulkpipe (dev->udev, 153 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); 154 dev->status = status; 155 return 0; 156 } 157 EXPORT_SYMBOL_GPL(usbnet_get_endpoints); 158 159 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress) 160 { 161 int tmp = -1, ret; 162 unsigned char buf [13]; 163 164 ret = usb_string(dev->udev, iMACAddress, buf, sizeof buf); 165 if (ret == 12) 166 tmp = hex2bin(dev->net->dev_addr, buf, 6); 167 if (tmp < 0) { 168 dev_dbg(&dev->udev->dev, 169 "bad MAC string %d fetch, %d\n", iMACAddress, tmp); 170 if (ret >= 0) 171 ret = -EINVAL; 172 return ret; 173 } 174 return 0; 175 } 176 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr); 177 178 static void intr_complete (struct urb *urb) 179 { 180 struct usbnet *dev = urb->context; 181 int status = urb->status; 182 183 switch (status) { 184 /* success */ 185 case 0: 186 dev->driver_info->status(dev, urb); 187 break; 188 189 /* software-driven interface shutdown */ 190 case -ENOENT: /* urb killed */ 191 case -ESHUTDOWN: /* hardware gone */ 192 netif_dbg(dev, ifdown, dev->net, 193 "intr shutdown, code %d\n", status); 194 return; 195 196 /* NOTE: not throttling like RX/TX, since this endpoint 197 * already polls infrequently 198 */ 199 default: 200 netdev_dbg(dev->net, "intr status %d\n", status); 201 break; 202 } 203 204 status = usb_submit_urb (urb, GFP_ATOMIC); 205 if (status != 0) 206 netif_err(dev, timer, dev->net, 207 "intr resubmit --> %d\n", status); 208 } 209 210 static int init_status (struct usbnet *dev, struct usb_interface *intf) 211 { 212 char *buf = NULL; 213 unsigned pipe = 0; 214 unsigned maxp; 215 unsigned period; 216 217 if (!dev->driver_info->status) 218 return 0; 219 220 pipe = usb_rcvintpipe (dev->udev, 221 dev->status->desc.bEndpointAddress 222 & USB_ENDPOINT_NUMBER_MASK); 223 maxp = usb_maxpacket (dev->udev, pipe, 0); 224 225 /* avoid 1 msec chatter: min 8 msec poll rate */ 226 period = max ((int) dev->status->desc.bInterval, 227 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3); 228 229 buf = kmalloc (maxp, GFP_KERNEL); 230 if (buf) { 231 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL); 232 if (!dev->interrupt) { 233 kfree (buf); 234 return -ENOMEM; 235 } else { 236 usb_fill_int_urb(dev->interrupt, dev->udev, pipe, 237 buf, maxp, intr_complete, dev, period); 238 dev->interrupt->transfer_flags |= URB_FREE_BUFFER; 239 dev_dbg(&intf->dev, 240 "status ep%din, %d bytes period %d\n", 241 usb_pipeendpoint(pipe), maxp, period); 242 } 243 } 244 return 0; 245 } 246 247 /* Submit the interrupt URB if not previously submitted, increasing refcount */ 248 int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags) 249 { 250 int ret = 0; 251 252 WARN_ON_ONCE(dev->interrupt == NULL); 253 if (dev->interrupt) { 254 mutex_lock(&dev->interrupt_mutex); 255 256 if (++dev->interrupt_count == 1) 257 ret = usb_submit_urb(dev->interrupt, mem_flags); 258 259 dev_dbg(&dev->udev->dev, "incremented interrupt URB count to %d\n", 260 dev->interrupt_count); 261 mutex_unlock(&dev->interrupt_mutex); 262 } 263 return ret; 264 } 265 EXPORT_SYMBOL_GPL(usbnet_status_start); 266 267 /* For resume; submit interrupt URB if previously submitted */ 268 static int __usbnet_status_start_force(struct usbnet *dev, gfp_t mem_flags) 269 { 270 int ret = 0; 271 272 mutex_lock(&dev->interrupt_mutex); 273 if (dev->interrupt_count) { 274 ret = usb_submit_urb(dev->interrupt, mem_flags); 275 dev_dbg(&dev->udev->dev, 276 "submitted interrupt URB for resume\n"); 277 } 278 mutex_unlock(&dev->interrupt_mutex); 279 return ret; 280 } 281 282 /* Kill the interrupt URB if all submitters want it killed */ 283 void usbnet_status_stop(struct usbnet *dev) 284 { 285 if (dev->interrupt) { 286 mutex_lock(&dev->interrupt_mutex); 287 WARN_ON(dev->interrupt_count == 0); 288 289 if (dev->interrupt_count && --dev->interrupt_count == 0) 290 usb_kill_urb(dev->interrupt); 291 292 dev_dbg(&dev->udev->dev, 293 "decremented interrupt URB count to %d\n", 294 dev->interrupt_count); 295 mutex_unlock(&dev->interrupt_mutex); 296 } 297 } 298 EXPORT_SYMBOL_GPL(usbnet_status_stop); 299 300 /* For suspend; always kill interrupt URB */ 301 static void __usbnet_status_stop_force(struct usbnet *dev) 302 { 303 if (dev->interrupt) { 304 mutex_lock(&dev->interrupt_mutex); 305 usb_kill_urb(dev->interrupt); 306 dev_dbg(&dev->udev->dev, "killed interrupt URB for suspend\n"); 307 mutex_unlock(&dev->interrupt_mutex); 308 } 309 } 310 311 /* Passes this packet up the stack, updating its accounting. 312 * Some link protocols batch packets, so their rx_fixup paths 313 * can return clones as well as just modify the original skb. 314 */ 315 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb) 316 { 317 struct pcpu_sw_netstats *stats64 = this_cpu_ptr(dev->stats64); 318 int status; 319 320 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) { 321 skb_queue_tail(&dev->rxq_pause, skb); 322 return; 323 } 324 325 /* only update if unset to allow minidriver rx_fixup override */ 326 if (skb->protocol == 0) 327 skb->protocol = eth_type_trans (skb, dev->net); 328 329 u64_stats_update_begin(&stats64->syncp); 330 stats64->rx_packets++; 331 stats64->rx_bytes += skb->len; 332 u64_stats_update_end(&stats64->syncp); 333 334 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n", 335 skb->len + sizeof (struct ethhdr), skb->protocol); 336 memset (skb->cb, 0, sizeof (struct skb_data)); 337 338 if (skb_defer_rx_timestamp(skb)) 339 return; 340 341 status = netif_rx (skb); 342 if (status != NET_RX_SUCCESS) 343 netif_dbg(dev, rx_err, dev->net, 344 "netif_rx status %d\n", status); 345 } 346 EXPORT_SYMBOL_GPL(usbnet_skb_return); 347 348 /* must be called if hard_mtu or rx_urb_size changed */ 349 void usbnet_update_max_qlen(struct usbnet *dev) 350 { 351 enum usb_device_speed speed = dev->udev->speed; 352 353 switch (speed) { 354 case USB_SPEED_HIGH: 355 dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size; 356 dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu; 357 break; 358 case USB_SPEED_SUPER: 359 case USB_SPEED_SUPER_PLUS: 360 /* 361 * Not take default 5ms qlen for super speed HC to 362 * save memory, and iperf tests show 2.5ms qlen can 363 * work well 364 */ 365 dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size; 366 dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu; 367 break; 368 default: 369 dev->rx_qlen = dev->tx_qlen = 4; 370 } 371 } 372 EXPORT_SYMBOL_GPL(usbnet_update_max_qlen); 373 374 375 /*------------------------------------------------------------------------- 376 * 377 * Network Device Driver (peer link to "Host Device", from USB host) 378 * 379 *-------------------------------------------------------------------------*/ 380 381 int usbnet_change_mtu (struct net_device *net, int new_mtu) 382 { 383 struct usbnet *dev = netdev_priv(net); 384 int ll_mtu = new_mtu + net->hard_header_len; 385 int old_hard_mtu = dev->hard_mtu; 386 int old_rx_urb_size = dev->rx_urb_size; 387 388 // no second zero-length packet read wanted after mtu-sized packets 389 if ((ll_mtu % dev->maxpacket) == 0) 390 return -EDOM; 391 net->mtu = new_mtu; 392 393 dev->hard_mtu = net->mtu + net->hard_header_len; 394 if (dev->rx_urb_size == old_hard_mtu) { 395 dev->rx_urb_size = dev->hard_mtu; 396 if (dev->rx_urb_size > old_rx_urb_size) { 397 usbnet_pause_rx(dev); 398 usbnet_unlink_rx_urbs(dev); 399 usbnet_resume_rx(dev); 400 } 401 } 402 403 /* max qlen depend on hard_mtu and rx_urb_size */ 404 usbnet_update_max_qlen(dev); 405 406 return 0; 407 } 408 EXPORT_SYMBOL_GPL(usbnet_change_mtu); 409 410 /* The caller must hold list->lock */ 411 static void __usbnet_queue_skb(struct sk_buff_head *list, 412 struct sk_buff *newsk, enum skb_state state) 413 { 414 struct skb_data *entry = (struct skb_data *) newsk->cb; 415 416 __skb_queue_tail(list, newsk); 417 entry->state = state; 418 } 419 420 /*-------------------------------------------------------------------------*/ 421 422 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from 423 * completion callbacks. 2.5 should have fixed those bugs... 424 */ 425 426 static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb, 427 struct sk_buff_head *list, enum skb_state state) 428 { 429 unsigned long flags; 430 enum skb_state old_state; 431 struct skb_data *entry = (struct skb_data *) skb->cb; 432 433 spin_lock_irqsave(&list->lock, flags); 434 old_state = entry->state; 435 entry->state = state; 436 __skb_unlink(skb, list); 437 438 /* defer_bh() is never called with list == &dev->done. 439 * spin_lock_nested() tells lockdep that it is OK to take 440 * dev->done.lock here with list->lock held. 441 */ 442 spin_lock_nested(&dev->done.lock, SINGLE_DEPTH_NESTING); 443 444 __skb_queue_tail(&dev->done, skb); 445 if (dev->done.qlen == 1) 446 tasklet_schedule(&dev->bh); 447 spin_unlock(&dev->done.lock); 448 spin_unlock_irqrestore(&list->lock, flags); 449 return old_state; 450 } 451 452 /* some work can't be done in tasklets, so we use keventd 453 * 454 * NOTE: annoying asymmetry: if it's active, schedule_work() fails, 455 * but tasklet_schedule() doesn't. hope the failure is rare. 456 */ 457 void usbnet_defer_kevent (struct usbnet *dev, int work) 458 { 459 set_bit (work, &dev->flags); 460 if (!schedule_work (&dev->kevent)) { 461 if (net_ratelimit()) 462 netdev_err(dev->net, "kevent %d may have been dropped\n", work); 463 } else { 464 netdev_dbg(dev->net, "kevent %d scheduled\n", work); 465 } 466 } 467 EXPORT_SYMBOL_GPL(usbnet_defer_kevent); 468 469 /*-------------------------------------------------------------------------*/ 470 471 static void rx_complete (struct urb *urb); 472 473 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) 474 { 475 struct sk_buff *skb; 476 struct skb_data *entry; 477 int retval = 0; 478 unsigned long lockflags; 479 size_t size = dev->rx_urb_size; 480 481 /* prevent rx skb allocation when error ratio is high */ 482 if (test_bit(EVENT_RX_KILL, &dev->flags)) { 483 usb_free_urb(urb); 484 return -ENOLINK; 485 } 486 487 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags); 488 if (!skb) { 489 netif_dbg(dev, rx_err, dev->net, "no rx skb\n"); 490 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 491 usb_free_urb (urb); 492 return -ENOMEM; 493 } 494 495 entry = (struct skb_data *) skb->cb; 496 entry->urb = urb; 497 entry->dev = dev; 498 entry->length = 0; 499 500 usb_fill_bulk_urb (urb, dev->udev, dev->in, 501 skb->data, size, rx_complete, skb); 502 503 spin_lock_irqsave (&dev->rxq.lock, lockflags); 504 505 if (netif_running (dev->net) && 506 netif_device_present (dev->net) && 507 !test_bit (EVENT_RX_HALT, &dev->flags) && 508 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) { 509 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) { 510 case -EPIPE: 511 usbnet_defer_kevent (dev, EVENT_RX_HALT); 512 break; 513 case -ENOMEM: 514 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 515 break; 516 case -ENODEV: 517 netif_dbg(dev, ifdown, dev->net, "device gone\n"); 518 netif_device_detach (dev->net); 519 break; 520 case -EHOSTUNREACH: 521 retval = -ENOLINK; 522 break; 523 default: 524 netif_dbg(dev, rx_err, dev->net, 525 "rx submit, %d\n", retval); 526 tasklet_schedule (&dev->bh); 527 break; 528 case 0: 529 __usbnet_queue_skb(&dev->rxq, skb, rx_start); 530 } 531 } else { 532 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n"); 533 retval = -ENOLINK; 534 } 535 spin_unlock_irqrestore (&dev->rxq.lock, lockflags); 536 if (retval) { 537 dev_kfree_skb_any (skb); 538 usb_free_urb (urb); 539 } 540 return retval; 541 } 542 543 544 /*-------------------------------------------------------------------------*/ 545 546 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb) 547 { 548 if (dev->driver_info->rx_fixup && 549 !dev->driver_info->rx_fixup (dev, skb)) { 550 /* With RX_ASSEMBLE, rx_fixup() must update counters */ 551 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE)) 552 dev->net->stats.rx_errors++; 553 goto done; 554 } 555 // else network stack removes extra byte if we forced a short packet 556 557 /* all data was already cloned from skb inside the driver */ 558 if (dev->driver_info->flags & FLAG_MULTI_PACKET) 559 goto done; 560 561 if (skb->len < ETH_HLEN) { 562 dev->net->stats.rx_errors++; 563 dev->net->stats.rx_length_errors++; 564 netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len); 565 } else { 566 usbnet_skb_return(dev, skb); 567 return; 568 } 569 570 done: 571 skb_queue_tail(&dev->done, skb); 572 } 573 574 /*-------------------------------------------------------------------------*/ 575 576 static void rx_complete (struct urb *urb) 577 { 578 struct sk_buff *skb = (struct sk_buff *) urb->context; 579 struct skb_data *entry = (struct skb_data *) skb->cb; 580 struct usbnet *dev = entry->dev; 581 int urb_status = urb->status; 582 enum skb_state state; 583 584 skb_put (skb, urb->actual_length); 585 state = rx_done; 586 entry->urb = NULL; 587 588 switch (urb_status) { 589 /* success */ 590 case 0: 591 break; 592 593 /* stalls need manual reset. this is rare ... except that 594 * when going through USB 2.0 TTs, unplug appears this way. 595 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ 596 * storm, recovering as needed. 597 */ 598 case -EPIPE: 599 dev->net->stats.rx_errors++; 600 usbnet_defer_kevent (dev, EVENT_RX_HALT); 601 // FALLTHROUGH 602 603 /* software-driven interface shutdown */ 604 case -ECONNRESET: /* async unlink */ 605 case -ESHUTDOWN: /* hardware gone */ 606 netif_dbg(dev, ifdown, dev->net, 607 "rx shutdown, code %d\n", urb_status); 608 goto block; 609 610 /* we get controller i/o faults during hub_wq disconnect() delays. 611 * throttle down resubmits, to avoid log floods; just temporarily, 612 * so we still recover when the fault isn't a hub_wq delay. 613 */ 614 case -EPROTO: 615 case -ETIME: 616 case -EILSEQ: 617 dev->net->stats.rx_errors++; 618 if (!timer_pending (&dev->delay)) { 619 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); 620 netif_dbg(dev, link, dev->net, 621 "rx throttle %d\n", urb_status); 622 } 623 block: 624 state = rx_cleanup; 625 entry->urb = urb; 626 urb = NULL; 627 break; 628 629 /* data overrun ... flush fifo? */ 630 case -EOVERFLOW: 631 dev->net->stats.rx_over_errors++; 632 // FALLTHROUGH 633 634 default: 635 state = rx_cleanup; 636 dev->net->stats.rx_errors++; 637 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status); 638 break; 639 } 640 641 /* stop rx if packet error rate is high */ 642 if (++dev->pkt_cnt > 30) { 643 dev->pkt_cnt = 0; 644 dev->pkt_err = 0; 645 } else { 646 if (state == rx_cleanup) 647 dev->pkt_err++; 648 if (dev->pkt_err > 20) 649 set_bit(EVENT_RX_KILL, &dev->flags); 650 } 651 652 state = defer_bh(dev, skb, &dev->rxq, state); 653 654 if (urb) { 655 if (netif_running (dev->net) && 656 !test_bit (EVENT_RX_HALT, &dev->flags) && 657 state != unlink_start) { 658 rx_submit (dev, urb, GFP_ATOMIC); 659 usb_mark_last_busy(dev->udev); 660 return; 661 } 662 usb_free_urb (urb); 663 } 664 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n"); 665 } 666 667 /*-------------------------------------------------------------------------*/ 668 void usbnet_pause_rx(struct usbnet *dev) 669 { 670 set_bit(EVENT_RX_PAUSED, &dev->flags); 671 672 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n"); 673 } 674 EXPORT_SYMBOL_GPL(usbnet_pause_rx); 675 676 void usbnet_resume_rx(struct usbnet *dev) 677 { 678 struct sk_buff *skb; 679 int num = 0; 680 681 clear_bit(EVENT_RX_PAUSED, &dev->flags); 682 683 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) { 684 usbnet_skb_return(dev, skb); 685 num++; 686 } 687 688 tasklet_schedule(&dev->bh); 689 690 netif_dbg(dev, rx_status, dev->net, 691 "paused rx queue disabled, %d skbs requeued\n", num); 692 } 693 EXPORT_SYMBOL_GPL(usbnet_resume_rx); 694 695 void usbnet_purge_paused_rxq(struct usbnet *dev) 696 { 697 skb_queue_purge(&dev->rxq_pause); 698 } 699 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq); 700 701 /*-------------------------------------------------------------------------*/ 702 703 // unlink pending rx/tx; completion handlers do all other cleanup 704 705 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) 706 { 707 unsigned long flags; 708 struct sk_buff *skb; 709 int count = 0; 710 711 spin_lock_irqsave (&q->lock, flags); 712 while (!skb_queue_empty(q)) { 713 struct skb_data *entry; 714 struct urb *urb; 715 int retval; 716 717 skb_queue_walk(q, skb) { 718 entry = (struct skb_data *) skb->cb; 719 if (entry->state != unlink_start) 720 goto found; 721 } 722 break; 723 found: 724 entry->state = unlink_start; 725 urb = entry->urb; 726 727 /* 728 * Get reference count of the URB to avoid it to be 729 * freed during usb_unlink_urb, which may trigger 730 * use-after-free problem inside usb_unlink_urb since 731 * usb_unlink_urb is always racing with .complete 732 * handler(include defer_bh). 733 */ 734 usb_get_urb(urb); 735 spin_unlock_irqrestore(&q->lock, flags); 736 // during some PM-driven resume scenarios, 737 // these (async) unlinks complete immediately 738 retval = usb_unlink_urb (urb); 739 if (retval != -EINPROGRESS && retval != 0) 740 netdev_dbg(dev->net, "unlink urb err, %d\n", retval); 741 else 742 count++; 743 usb_put_urb(urb); 744 spin_lock_irqsave(&q->lock, flags); 745 } 746 spin_unlock_irqrestore (&q->lock, flags); 747 return count; 748 } 749 750 // Flush all pending rx urbs 751 // minidrivers may need to do this when the MTU changes 752 753 void usbnet_unlink_rx_urbs(struct usbnet *dev) 754 { 755 if (netif_running(dev->net)) { 756 (void) unlink_urbs (dev, &dev->rxq); 757 tasklet_schedule(&dev->bh); 758 } 759 } 760 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); 761 762 /*-------------------------------------------------------------------------*/ 763 764 static void wait_skb_queue_empty(struct sk_buff_head *q) 765 { 766 unsigned long flags; 767 768 spin_lock_irqsave(&q->lock, flags); 769 while (!skb_queue_empty(q)) { 770 spin_unlock_irqrestore(&q->lock, flags); 771 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS)); 772 set_current_state(TASK_UNINTERRUPTIBLE); 773 spin_lock_irqsave(&q->lock, flags); 774 } 775 spin_unlock_irqrestore(&q->lock, flags); 776 } 777 778 // precondition: never called in_interrupt 779 static void usbnet_terminate_urbs(struct usbnet *dev) 780 { 781 DECLARE_WAITQUEUE(wait, current); 782 int temp; 783 784 /* ensure there are no more active urbs */ 785 add_wait_queue(&dev->wait, &wait); 786 set_current_state(TASK_UNINTERRUPTIBLE); 787 temp = unlink_urbs(dev, &dev->txq) + 788 unlink_urbs(dev, &dev->rxq); 789 790 /* maybe wait for deletions to finish. */ 791 wait_skb_queue_empty(&dev->rxq); 792 wait_skb_queue_empty(&dev->txq); 793 wait_skb_queue_empty(&dev->done); 794 netif_dbg(dev, ifdown, dev->net, 795 "waited for %d urb completions\n", temp); 796 set_current_state(TASK_RUNNING); 797 remove_wait_queue(&dev->wait, &wait); 798 } 799 800 int usbnet_stop (struct net_device *net) 801 { 802 struct usbnet *dev = netdev_priv(net); 803 struct driver_info *info = dev->driver_info; 804 int retval, pm, mpn; 805 806 clear_bit(EVENT_DEV_OPEN, &dev->flags); 807 netif_stop_queue (net); 808 809 netif_info(dev, ifdown, dev->net, 810 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n", 811 net->stats.rx_packets, net->stats.tx_packets, 812 net->stats.rx_errors, net->stats.tx_errors); 813 814 /* to not race resume */ 815 pm = usb_autopm_get_interface(dev->intf); 816 /* allow minidriver to stop correctly (wireless devices to turn off 817 * radio etc) */ 818 if (info->stop) { 819 retval = info->stop(dev); 820 if (retval < 0) 821 netif_info(dev, ifdown, dev->net, 822 "stop fail (%d) usbnet usb-%s-%s, %s\n", 823 retval, 824 dev->udev->bus->bus_name, dev->udev->devpath, 825 info->description); 826 } 827 828 if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) 829 usbnet_terminate_urbs(dev); 830 831 usbnet_status_stop(dev); 832 833 usbnet_purge_paused_rxq(dev); 834 835 mpn = !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags); 836 837 /* deferred work (task, timer, softirq) must also stop. 838 * can't flush_scheduled_work() until we drop rtnl (later), 839 * else workers could deadlock; so make workers a NOP. 840 */ 841 dev->flags = 0; 842 del_timer_sync (&dev->delay); 843 tasklet_kill (&dev->bh); 844 if (!pm) 845 usb_autopm_put_interface(dev->intf); 846 847 if (info->manage_power && mpn) 848 info->manage_power(dev, 0); 849 else 850 usb_autopm_put_interface(dev->intf); 851 852 return 0; 853 } 854 EXPORT_SYMBOL_GPL(usbnet_stop); 855 856 /*-------------------------------------------------------------------------*/ 857 858 // posts reads, and enables write queuing 859 860 // precondition: never called in_interrupt 861 862 int usbnet_open (struct net_device *net) 863 { 864 struct usbnet *dev = netdev_priv(net); 865 int retval; 866 struct driver_info *info = dev->driver_info; 867 868 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { 869 netif_info(dev, ifup, dev->net, 870 "resumption fail (%d) usbnet usb-%s-%s, %s\n", 871 retval, 872 dev->udev->bus->bus_name, 873 dev->udev->devpath, 874 info->description); 875 goto done_nopm; 876 } 877 878 // put into "known safe" state 879 if (info->reset && (retval = info->reset (dev)) < 0) { 880 netif_info(dev, ifup, dev->net, 881 "open reset fail (%d) usbnet usb-%s-%s, %s\n", 882 retval, 883 dev->udev->bus->bus_name, 884 dev->udev->devpath, 885 info->description); 886 goto done; 887 } 888 889 /* hard_mtu or rx_urb_size may change in reset() */ 890 usbnet_update_max_qlen(dev); 891 892 // insist peer be connected 893 if (info->check_connect && (retval = info->check_connect (dev)) < 0) { 894 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval); 895 goto done; 896 } 897 898 /* start any status interrupt transfer */ 899 if (dev->interrupt) { 900 retval = usbnet_status_start(dev, GFP_KERNEL); 901 if (retval < 0) { 902 netif_err(dev, ifup, dev->net, 903 "intr submit %d\n", retval); 904 goto done; 905 } 906 } 907 908 set_bit(EVENT_DEV_OPEN, &dev->flags); 909 netif_start_queue (net); 910 netif_info(dev, ifup, dev->net, 911 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n", 912 (int)RX_QLEN(dev), (int)TX_QLEN(dev), 913 dev->net->mtu, 914 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" : 915 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" : 916 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" : 917 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" : 918 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" : 919 "simple"); 920 921 /* reset rx error state */ 922 dev->pkt_cnt = 0; 923 dev->pkt_err = 0; 924 clear_bit(EVENT_RX_KILL, &dev->flags); 925 926 // delay posting reads until we're fully open 927 tasklet_schedule (&dev->bh); 928 if (info->manage_power) { 929 retval = info->manage_power(dev, 1); 930 if (retval < 0) { 931 retval = 0; 932 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags); 933 } else { 934 usb_autopm_put_interface(dev->intf); 935 } 936 } 937 return retval; 938 done: 939 usb_autopm_put_interface(dev->intf); 940 done_nopm: 941 return retval; 942 } 943 EXPORT_SYMBOL_GPL(usbnet_open); 944 945 /*-------------------------------------------------------------------------*/ 946 947 /* ethtool methods; minidrivers may need to add some more, but 948 * they'll probably want to use this base set. 949 */ 950 951 int usbnet_get_link_ksettings(struct net_device *net, 952 struct ethtool_link_ksettings *cmd) 953 { 954 struct usbnet *dev = netdev_priv(net); 955 956 if (!dev->mii.mdio_read) 957 return -EOPNOTSUPP; 958 959 mii_ethtool_get_link_ksettings(&dev->mii, cmd); 960 961 return 0; 962 } 963 EXPORT_SYMBOL_GPL(usbnet_get_link_ksettings); 964 965 int usbnet_set_link_ksettings(struct net_device *net, 966 const struct ethtool_link_ksettings *cmd) 967 { 968 struct usbnet *dev = netdev_priv(net); 969 int retval; 970 971 if (!dev->mii.mdio_write) 972 return -EOPNOTSUPP; 973 974 retval = mii_ethtool_set_link_ksettings(&dev->mii, cmd); 975 976 /* link speed/duplex might have changed */ 977 if (dev->driver_info->link_reset) 978 dev->driver_info->link_reset(dev); 979 980 /* hard_mtu or rx_urb_size may change in link_reset() */ 981 usbnet_update_max_qlen(dev); 982 983 return retval; 984 } 985 EXPORT_SYMBOL_GPL(usbnet_set_link_ksettings); 986 987 void usbnet_get_stats64(struct net_device *net, struct rtnl_link_stats64 *stats) 988 { 989 struct usbnet *dev = netdev_priv(net); 990 unsigned int start; 991 int cpu; 992 993 netdev_stats_to_stats64(stats, &net->stats); 994 995 for_each_possible_cpu(cpu) { 996 struct pcpu_sw_netstats *stats64; 997 u64 rx_packets, rx_bytes; 998 u64 tx_packets, tx_bytes; 999 1000 stats64 = per_cpu_ptr(dev->stats64, cpu); 1001 1002 do { 1003 start = u64_stats_fetch_begin_irq(&stats64->syncp); 1004 rx_packets = stats64->rx_packets; 1005 rx_bytes = stats64->rx_bytes; 1006 tx_packets = stats64->tx_packets; 1007 tx_bytes = stats64->tx_bytes; 1008 } while (u64_stats_fetch_retry_irq(&stats64->syncp, start)); 1009 1010 stats->rx_packets += rx_packets; 1011 stats->rx_bytes += rx_bytes; 1012 stats->tx_packets += tx_packets; 1013 stats->tx_bytes += tx_bytes; 1014 } 1015 } 1016 EXPORT_SYMBOL_GPL(usbnet_get_stats64); 1017 1018 u32 usbnet_get_link (struct net_device *net) 1019 { 1020 struct usbnet *dev = netdev_priv(net); 1021 1022 /* If a check_connect is defined, return its result */ 1023 if (dev->driver_info->check_connect) 1024 return dev->driver_info->check_connect (dev) == 0; 1025 1026 /* if the device has mii operations, use those */ 1027 if (dev->mii.mdio_read) 1028 return mii_link_ok(&dev->mii); 1029 1030 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ 1031 return ethtool_op_get_link(net); 1032 } 1033 EXPORT_SYMBOL_GPL(usbnet_get_link); 1034 1035 int usbnet_nway_reset(struct net_device *net) 1036 { 1037 struct usbnet *dev = netdev_priv(net); 1038 1039 if (!dev->mii.mdio_write) 1040 return -EOPNOTSUPP; 1041 1042 return mii_nway_restart(&dev->mii); 1043 } 1044 EXPORT_SYMBOL_GPL(usbnet_nway_reset); 1045 1046 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) 1047 { 1048 struct usbnet *dev = netdev_priv(net); 1049 1050 strlcpy (info->driver, dev->driver_name, sizeof info->driver); 1051 strlcpy (info->version, DRIVER_VERSION, sizeof info->version); 1052 strlcpy (info->fw_version, dev->driver_info->description, 1053 sizeof info->fw_version); 1054 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); 1055 } 1056 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); 1057 1058 u32 usbnet_get_msglevel (struct net_device *net) 1059 { 1060 struct usbnet *dev = netdev_priv(net); 1061 1062 return dev->msg_enable; 1063 } 1064 EXPORT_SYMBOL_GPL(usbnet_get_msglevel); 1065 1066 void usbnet_set_msglevel (struct net_device *net, u32 level) 1067 { 1068 struct usbnet *dev = netdev_priv(net); 1069 1070 dev->msg_enable = level; 1071 } 1072 EXPORT_SYMBOL_GPL(usbnet_set_msglevel); 1073 1074 /* drivers may override default ethtool_ops in their bind() routine */ 1075 static const struct ethtool_ops usbnet_ethtool_ops = { 1076 .get_link = usbnet_get_link, 1077 .nway_reset = usbnet_nway_reset, 1078 .get_drvinfo = usbnet_get_drvinfo, 1079 .get_msglevel = usbnet_get_msglevel, 1080 .set_msglevel = usbnet_set_msglevel, 1081 .get_ts_info = ethtool_op_get_ts_info, 1082 .get_link_ksettings = usbnet_get_link_ksettings, 1083 .set_link_ksettings = usbnet_set_link_ksettings, 1084 }; 1085 1086 /*-------------------------------------------------------------------------*/ 1087 1088 static void __handle_link_change(struct usbnet *dev) 1089 { 1090 if (!test_bit(EVENT_DEV_OPEN, &dev->flags)) 1091 return; 1092 1093 if (!netif_carrier_ok(dev->net)) { 1094 /* kill URBs for reading packets to save bus bandwidth */ 1095 unlink_urbs(dev, &dev->rxq); 1096 1097 /* 1098 * tx_timeout will unlink URBs for sending packets and 1099 * tx queue is stopped by netcore after link becomes off 1100 */ 1101 } else { 1102 /* submitting URBs for reading packets */ 1103 tasklet_schedule(&dev->bh); 1104 } 1105 1106 /* hard_mtu or rx_urb_size may change during link change */ 1107 usbnet_update_max_qlen(dev); 1108 1109 clear_bit(EVENT_LINK_CHANGE, &dev->flags); 1110 } 1111 1112 static void usbnet_set_rx_mode(struct net_device *net) 1113 { 1114 struct usbnet *dev = netdev_priv(net); 1115 1116 usbnet_defer_kevent(dev, EVENT_SET_RX_MODE); 1117 } 1118 1119 static void __handle_set_rx_mode(struct usbnet *dev) 1120 { 1121 if (dev->driver_info->set_rx_mode) 1122 (dev->driver_info->set_rx_mode)(dev); 1123 1124 clear_bit(EVENT_SET_RX_MODE, &dev->flags); 1125 } 1126 1127 /* work that cannot be done in interrupt context uses keventd. 1128 * 1129 * NOTE: with 2.5 we could do more of this using completion callbacks, 1130 * especially now that control transfers can be queued. 1131 */ 1132 static void 1133 usbnet_deferred_kevent (struct work_struct *work) 1134 { 1135 struct usbnet *dev = 1136 container_of(work, struct usbnet, kevent); 1137 int status; 1138 1139 /* usb_clear_halt() needs a thread context */ 1140 if (test_bit (EVENT_TX_HALT, &dev->flags)) { 1141 unlink_urbs (dev, &dev->txq); 1142 status = usb_autopm_get_interface(dev->intf); 1143 if (status < 0) 1144 goto fail_pipe; 1145 status = usb_clear_halt (dev->udev, dev->out); 1146 usb_autopm_put_interface(dev->intf); 1147 if (status < 0 && 1148 status != -EPIPE && 1149 status != -ESHUTDOWN) { 1150 if (netif_msg_tx_err (dev)) 1151 fail_pipe: 1152 netdev_err(dev->net, "can't clear tx halt, status %d\n", 1153 status); 1154 } else { 1155 clear_bit (EVENT_TX_HALT, &dev->flags); 1156 if (status != -ESHUTDOWN) 1157 netif_wake_queue (dev->net); 1158 } 1159 } 1160 if (test_bit (EVENT_RX_HALT, &dev->flags)) { 1161 unlink_urbs (dev, &dev->rxq); 1162 status = usb_autopm_get_interface(dev->intf); 1163 if (status < 0) 1164 goto fail_halt; 1165 status = usb_clear_halt (dev->udev, dev->in); 1166 usb_autopm_put_interface(dev->intf); 1167 if (status < 0 && 1168 status != -EPIPE && 1169 status != -ESHUTDOWN) { 1170 if (netif_msg_rx_err (dev)) 1171 fail_halt: 1172 netdev_err(dev->net, "can't clear rx halt, status %d\n", 1173 status); 1174 } else { 1175 clear_bit (EVENT_RX_HALT, &dev->flags); 1176 tasklet_schedule (&dev->bh); 1177 } 1178 } 1179 1180 /* tasklet could resubmit itself forever if memory is tight */ 1181 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { 1182 struct urb *urb = NULL; 1183 int resched = 1; 1184 1185 if (netif_running (dev->net)) 1186 urb = usb_alloc_urb (0, GFP_KERNEL); 1187 else 1188 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1189 if (urb != NULL) { 1190 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1191 status = usb_autopm_get_interface(dev->intf); 1192 if (status < 0) { 1193 usb_free_urb(urb); 1194 goto fail_lowmem; 1195 } 1196 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) 1197 resched = 0; 1198 usb_autopm_put_interface(dev->intf); 1199 fail_lowmem: 1200 if (resched) 1201 tasklet_schedule (&dev->bh); 1202 } 1203 } 1204 1205 if (test_bit (EVENT_LINK_RESET, &dev->flags)) { 1206 struct driver_info *info = dev->driver_info; 1207 int retval = 0; 1208 1209 clear_bit (EVENT_LINK_RESET, &dev->flags); 1210 status = usb_autopm_get_interface(dev->intf); 1211 if (status < 0) 1212 goto skip_reset; 1213 if(info->link_reset && (retval = info->link_reset(dev)) < 0) { 1214 usb_autopm_put_interface(dev->intf); 1215 skip_reset: 1216 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", 1217 retval, 1218 dev->udev->bus->bus_name, 1219 dev->udev->devpath, 1220 info->description); 1221 } else { 1222 usb_autopm_put_interface(dev->intf); 1223 } 1224 1225 /* handle link change from link resetting */ 1226 __handle_link_change(dev); 1227 } 1228 1229 if (test_bit (EVENT_LINK_CHANGE, &dev->flags)) 1230 __handle_link_change(dev); 1231 1232 if (test_bit (EVENT_SET_RX_MODE, &dev->flags)) 1233 __handle_set_rx_mode(dev); 1234 1235 1236 if (dev->flags) 1237 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); 1238 } 1239 1240 /*-------------------------------------------------------------------------*/ 1241 1242 static void tx_complete (struct urb *urb) 1243 { 1244 struct sk_buff *skb = (struct sk_buff *) urb->context; 1245 struct skb_data *entry = (struct skb_data *) skb->cb; 1246 struct usbnet *dev = entry->dev; 1247 1248 if (urb->status == 0) { 1249 struct pcpu_sw_netstats *stats64 = this_cpu_ptr(dev->stats64); 1250 1251 u64_stats_update_begin(&stats64->syncp); 1252 stats64->tx_packets += entry->packets; 1253 stats64->tx_bytes += entry->length; 1254 u64_stats_update_end(&stats64->syncp); 1255 } else { 1256 dev->net->stats.tx_errors++; 1257 1258 switch (urb->status) { 1259 case -EPIPE: 1260 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1261 break; 1262 1263 /* software-driven interface shutdown */ 1264 case -ECONNRESET: // async unlink 1265 case -ESHUTDOWN: // hardware gone 1266 break; 1267 1268 /* like rx, tx gets controller i/o faults during hub_wq 1269 * delays and so it uses the same throttling mechanism. 1270 */ 1271 case -EPROTO: 1272 case -ETIME: 1273 case -EILSEQ: 1274 usb_mark_last_busy(dev->udev); 1275 if (!timer_pending (&dev->delay)) { 1276 mod_timer (&dev->delay, 1277 jiffies + THROTTLE_JIFFIES); 1278 netif_dbg(dev, link, dev->net, 1279 "tx throttle %d\n", urb->status); 1280 } 1281 netif_stop_queue (dev->net); 1282 break; 1283 default: 1284 netif_dbg(dev, tx_err, dev->net, 1285 "tx err %d\n", entry->urb->status); 1286 break; 1287 } 1288 } 1289 1290 usb_autopm_put_interface_async(dev->intf); 1291 (void) defer_bh(dev, skb, &dev->txq, tx_done); 1292 } 1293 1294 /*-------------------------------------------------------------------------*/ 1295 1296 void usbnet_tx_timeout (struct net_device *net) 1297 { 1298 struct usbnet *dev = netdev_priv(net); 1299 1300 unlink_urbs (dev, &dev->txq); 1301 tasklet_schedule (&dev->bh); 1302 /* this needs to be handled individually because the generic layer 1303 * doesn't know what is sufficient and could not restore private 1304 * information if a remedy of an unconditional reset were used. 1305 */ 1306 if (dev->driver_info->recover) 1307 (dev->driver_info->recover)(dev); 1308 } 1309 EXPORT_SYMBOL_GPL(usbnet_tx_timeout); 1310 1311 /*-------------------------------------------------------------------------*/ 1312 1313 static int build_dma_sg(const struct sk_buff *skb, struct urb *urb) 1314 { 1315 unsigned num_sgs, total_len = 0; 1316 int i, s = 0; 1317 1318 num_sgs = skb_shinfo(skb)->nr_frags + 1; 1319 if (num_sgs == 1) 1320 return 0; 1321 1322 /* reserve one for zero packet */ 1323 urb->sg = kmalloc((num_sgs + 1) * sizeof(struct scatterlist), 1324 GFP_ATOMIC); 1325 if (!urb->sg) 1326 return -ENOMEM; 1327 1328 urb->num_sgs = num_sgs; 1329 sg_init_table(urb->sg, urb->num_sgs + 1); 1330 1331 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb)); 1332 total_len += skb_headlen(skb); 1333 1334 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1335 struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i]; 1336 1337 total_len += skb_frag_size(f); 1338 sg_set_page(&urb->sg[i + s], f->page.p, f->size, 1339 f->page_offset); 1340 } 1341 urb->transfer_buffer_length = total_len; 1342 1343 return 1; 1344 } 1345 1346 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, 1347 struct net_device *net) 1348 { 1349 struct usbnet *dev = netdev_priv(net); 1350 unsigned int length; 1351 struct urb *urb = NULL; 1352 struct skb_data *entry; 1353 struct driver_info *info = dev->driver_info; 1354 unsigned long flags; 1355 int retval; 1356 1357 if (skb) 1358 skb_tx_timestamp(skb); 1359 1360 // some devices want funky USB-level framing, for 1361 // win32 driver (usually) and/or hardware quirks 1362 if (info->tx_fixup) { 1363 skb = info->tx_fixup (dev, skb, GFP_ATOMIC); 1364 if (!skb) { 1365 /* packet collected; minidriver waiting for more */ 1366 if (info->flags & FLAG_MULTI_PACKET) 1367 goto not_drop; 1368 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); 1369 goto drop; 1370 } 1371 } 1372 1373 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { 1374 netif_dbg(dev, tx_err, dev->net, "no urb\n"); 1375 goto drop; 1376 } 1377 1378 entry = (struct skb_data *) skb->cb; 1379 entry->urb = urb; 1380 entry->dev = dev; 1381 1382 usb_fill_bulk_urb (urb, dev->udev, dev->out, 1383 skb->data, skb->len, tx_complete, skb); 1384 if (dev->can_dma_sg) { 1385 if (build_dma_sg(skb, urb) < 0) 1386 goto drop; 1387 } 1388 length = urb->transfer_buffer_length; 1389 1390 /* don't assume the hardware handles USB_ZERO_PACKET 1391 * NOTE: strictly conforming cdc-ether devices should expect 1392 * the ZLP here, but ignore the one-byte packet. 1393 * NOTE2: CDC NCM specification is different from CDC ECM when 1394 * handling ZLP/short packets, so cdc_ncm driver will make short 1395 * packet itself if needed. 1396 */ 1397 if (length % dev->maxpacket == 0) { 1398 if (!(info->flags & FLAG_SEND_ZLP)) { 1399 if (!(info->flags & FLAG_MULTI_PACKET)) { 1400 length++; 1401 if (skb_tailroom(skb) && !urb->num_sgs) { 1402 skb->data[skb->len] = 0; 1403 __skb_put(skb, 1); 1404 } else if (urb->num_sgs) 1405 sg_set_buf(&urb->sg[urb->num_sgs++], 1406 dev->padding_pkt, 1); 1407 } 1408 } else 1409 urb->transfer_flags |= URB_ZERO_PACKET; 1410 } 1411 urb->transfer_buffer_length = length; 1412 1413 if (info->flags & FLAG_MULTI_PACKET) { 1414 /* Driver has set number of packets and a length delta. 1415 * Calculate the complete length and ensure that it's 1416 * positive. 1417 */ 1418 entry->length += length; 1419 if (WARN_ON_ONCE(entry->length <= 0)) 1420 entry->length = length; 1421 } else { 1422 usbnet_set_skb_tx_stats(skb, 1, length); 1423 } 1424 1425 spin_lock_irqsave(&dev->txq.lock, flags); 1426 retval = usb_autopm_get_interface_async(dev->intf); 1427 if (retval < 0) { 1428 spin_unlock_irqrestore(&dev->txq.lock, flags); 1429 goto drop; 1430 } 1431 1432 #ifdef CONFIG_PM 1433 /* if this triggers the device is still a sleep */ 1434 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { 1435 /* transmission will be done in resume */ 1436 usb_anchor_urb(urb, &dev->deferred); 1437 /* no use to process more packets */ 1438 netif_stop_queue(net); 1439 usb_put_urb(urb); 1440 spin_unlock_irqrestore(&dev->txq.lock, flags); 1441 netdev_dbg(dev->net, "Delaying transmission for resumption\n"); 1442 goto deferred; 1443 } 1444 #endif 1445 1446 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { 1447 case -EPIPE: 1448 netif_stop_queue (net); 1449 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1450 usb_autopm_put_interface_async(dev->intf); 1451 break; 1452 default: 1453 usb_autopm_put_interface_async(dev->intf); 1454 netif_dbg(dev, tx_err, dev->net, 1455 "tx: submit urb err %d\n", retval); 1456 break; 1457 case 0: 1458 netif_trans_update(net); 1459 __usbnet_queue_skb(&dev->txq, skb, tx_start); 1460 if (dev->txq.qlen >= TX_QLEN (dev)) 1461 netif_stop_queue (net); 1462 } 1463 spin_unlock_irqrestore (&dev->txq.lock, flags); 1464 1465 if (retval) { 1466 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); 1467 drop: 1468 dev->net->stats.tx_dropped++; 1469 not_drop: 1470 if (skb) 1471 dev_kfree_skb_any (skb); 1472 if (urb) { 1473 kfree(urb->sg); 1474 usb_free_urb(urb); 1475 } 1476 } else 1477 netif_dbg(dev, tx_queued, dev->net, 1478 "> tx, len %u, type 0x%x\n", length, skb->protocol); 1479 #ifdef CONFIG_PM 1480 deferred: 1481 #endif 1482 return NETDEV_TX_OK; 1483 } 1484 EXPORT_SYMBOL_GPL(usbnet_start_xmit); 1485 1486 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags) 1487 { 1488 struct urb *urb; 1489 int i; 1490 int ret = 0; 1491 1492 /* don't refill the queue all at once */ 1493 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) { 1494 urb = usb_alloc_urb(0, flags); 1495 if (urb != NULL) { 1496 ret = rx_submit(dev, urb, flags); 1497 if (ret) 1498 goto err; 1499 } else { 1500 ret = -ENOMEM; 1501 goto err; 1502 } 1503 } 1504 err: 1505 return ret; 1506 } 1507 1508 /*-------------------------------------------------------------------------*/ 1509 1510 // tasklet (work deferred from completions, in_irq) or timer 1511 1512 static void usbnet_bh (unsigned long param) 1513 { 1514 struct usbnet *dev = (struct usbnet *) param; 1515 struct sk_buff *skb; 1516 struct skb_data *entry; 1517 1518 while ((skb = skb_dequeue (&dev->done))) { 1519 entry = (struct skb_data *) skb->cb; 1520 switch (entry->state) { 1521 case rx_done: 1522 entry->state = rx_cleanup; 1523 rx_process (dev, skb); 1524 continue; 1525 case tx_done: 1526 kfree(entry->urb->sg); 1527 case rx_cleanup: 1528 usb_free_urb (entry->urb); 1529 dev_kfree_skb (skb); 1530 continue; 1531 default: 1532 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); 1533 } 1534 } 1535 1536 /* restart RX again after disabling due to high error rate */ 1537 clear_bit(EVENT_RX_KILL, &dev->flags); 1538 1539 /* waiting for all pending urbs to complete? 1540 * only then can we forgo submitting anew 1541 */ 1542 if (waitqueue_active(&dev->wait)) { 1543 if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0) 1544 wake_up_all(&dev->wait); 1545 1546 // or are we maybe short a few urbs? 1547 } else if (netif_running (dev->net) && 1548 netif_device_present (dev->net) && 1549 netif_carrier_ok(dev->net) && 1550 !timer_pending(&dev->delay) && 1551 !test_bit(EVENT_RX_PAUSED, &dev->flags) && 1552 !test_bit(EVENT_RX_HALT, &dev->flags)) { 1553 int temp = dev->rxq.qlen; 1554 1555 if (temp < RX_QLEN(dev)) { 1556 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK) 1557 return; 1558 if (temp != dev->rxq.qlen) 1559 netif_dbg(dev, link, dev->net, 1560 "rxqlen %d --> %d\n", 1561 temp, dev->rxq.qlen); 1562 if (dev->rxq.qlen < RX_QLEN(dev)) 1563 tasklet_schedule (&dev->bh); 1564 } 1565 if (dev->txq.qlen < TX_QLEN (dev)) 1566 netif_wake_queue (dev->net); 1567 } 1568 } 1569 1570 1571 /*------------------------------------------------------------------------- 1572 * 1573 * USB Device Driver support 1574 * 1575 *-------------------------------------------------------------------------*/ 1576 1577 // precondition: never called in_interrupt 1578 1579 void usbnet_disconnect (struct usb_interface *intf) 1580 { 1581 struct usbnet *dev; 1582 struct usb_device *xdev; 1583 struct net_device *net; 1584 1585 dev = usb_get_intfdata(intf); 1586 usb_set_intfdata(intf, NULL); 1587 if (!dev) 1588 return; 1589 1590 xdev = interface_to_usbdev (intf); 1591 1592 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", 1593 intf->dev.driver->name, 1594 xdev->bus->bus_name, xdev->devpath, 1595 dev->driver_info->description); 1596 1597 net = dev->net; 1598 unregister_netdev (net); 1599 1600 cancel_work_sync(&dev->kevent); 1601 1602 usb_scuttle_anchored_urbs(&dev->deferred); 1603 1604 if (dev->driver_info->unbind) 1605 dev->driver_info->unbind (dev, intf); 1606 1607 usb_kill_urb(dev->interrupt); 1608 usb_free_urb(dev->interrupt); 1609 kfree(dev->padding_pkt); 1610 1611 free_percpu(dev->stats64); 1612 free_netdev(net); 1613 } 1614 EXPORT_SYMBOL_GPL(usbnet_disconnect); 1615 1616 static const struct net_device_ops usbnet_netdev_ops = { 1617 .ndo_open = usbnet_open, 1618 .ndo_stop = usbnet_stop, 1619 .ndo_start_xmit = usbnet_start_xmit, 1620 .ndo_tx_timeout = usbnet_tx_timeout, 1621 .ndo_set_rx_mode = usbnet_set_rx_mode, 1622 .ndo_change_mtu = usbnet_change_mtu, 1623 .ndo_get_stats64 = usbnet_get_stats64, 1624 .ndo_set_mac_address = eth_mac_addr, 1625 .ndo_validate_addr = eth_validate_addr, 1626 }; 1627 1628 /*-------------------------------------------------------------------------*/ 1629 1630 // precondition: never called in_interrupt 1631 1632 static struct device_type wlan_type = { 1633 .name = "wlan", 1634 }; 1635 1636 static struct device_type wwan_type = { 1637 .name = "wwan", 1638 }; 1639 1640 int 1641 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) 1642 { 1643 struct usbnet *dev; 1644 struct net_device *net; 1645 struct usb_host_interface *interface; 1646 struct driver_info *info; 1647 struct usb_device *xdev; 1648 int status; 1649 const char *name; 1650 struct usb_driver *driver = to_usb_driver(udev->dev.driver); 1651 1652 /* usbnet already took usb runtime pm, so have to enable the feature 1653 * for usb interface, otherwise usb_autopm_get_interface may return 1654 * failure if RUNTIME_PM is enabled. 1655 */ 1656 if (!driver->supports_autosuspend) { 1657 driver->supports_autosuspend = 1; 1658 pm_runtime_enable(&udev->dev); 1659 } 1660 1661 name = udev->dev.driver->name; 1662 info = (struct driver_info *) prod->driver_info; 1663 if (!info) { 1664 dev_dbg (&udev->dev, "blacklisted by %s\n", name); 1665 return -ENODEV; 1666 } 1667 xdev = interface_to_usbdev (udev); 1668 interface = udev->cur_altsetting; 1669 1670 status = -ENOMEM; 1671 1672 // set up our own records 1673 net = alloc_etherdev(sizeof(*dev)); 1674 if (!net) 1675 goto out; 1676 1677 /* netdev_printk() needs this so do it as early as possible */ 1678 SET_NETDEV_DEV(net, &udev->dev); 1679 1680 dev = netdev_priv(net); 1681 dev->udev = xdev; 1682 dev->intf = udev; 1683 dev->driver_info = info; 1684 dev->driver_name = name; 1685 1686 dev->stats64 = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1687 if (!dev->stats64) 1688 goto out0; 1689 1690 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV 1691 | NETIF_MSG_PROBE | NETIF_MSG_LINK); 1692 init_waitqueue_head(&dev->wait); 1693 skb_queue_head_init (&dev->rxq); 1694 skb_queue_head_init (&dev->txq); 1695 skb_queue_head_init (&dev->done); 1696 skb_queue_head_init(&dev->rxq_pause); 1697 dev->bh.func = usbnet_bh; 1698 dev->bh.data = (unsigned long) dev; 1699 INIT_WORK (&dev->kevent, usbnet_deferred_kevent); 1700 init_usb_anchor(&dev->deferred); 1701 dev->delay.function = usbnet_bh; 1702 dev->delay.data = (unsigned long) dev; 1703 init_timer (&dev->delay); 1704 mutex_init (&dev->phy_mutex); 1705 mutex_init(&dev->interrupt_mutex); 1706 dev->interrupt_count = 0; 1707 1708 dev->net = net; 1709 strcpy (net->name, "usb%d"); 1710 memcpy (net->dev_addr, node_id, sizeof node_id); 1711 1712 /* rx and tx sides can use different message sizes; 1713 * bind() should set rx_urb_size in that case. 1714 */ 1715 dev->hard_mtu = net->mtu + net->hard_header_len; 1716 net->min_mtu = 0; 1717 net->max_mtu = ETH_MAX_MTU; 1718 1719 net->netdev_ops = &usbnet_netdev_ops; 1720 net->watchdog_timeo = TX_TIMEOUT_JIFFIES; 1721 net->ethtool_ops = &usbnet_ethtool_ops; 1722 1723 // allow device-specific bind/init procedures 1724 // NOTE net->name still not usable ... 1725 if (info->bind) { 1726 status = info->bind (dev, udev); 1727 if (status < 0) 1728 goto out1; 1729 1730 // heuristic: "usb%d" for links we know are two-host, 1731 // else "eth%d" when there's reasonable doubt. userspace 1732 // can rename the link if it knows better. 1733 if ((dev->driver_info->flags & FLAG_ETHER) != 0 && 1734 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 || 1735 (net->dev_addr [0] & 0x02) == 0)) 1736 strcpy (net->name, "eth%d"); 1737 /* WLAN devices should always be named "wlan%d" */ 1738 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1739 strcpy(net->name, "wlan%d"); 1740 /* WWAN devices should always be named "wwan%d" */ 1741 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1742 strcpy(net->name, "wwan%d"); 1743 1744 /* devices that cannot do ARP */ 1745 if ((dev->driver_info->flags & FLAG_NOARP) != 0) 1746 net->flags |= IFF_NOARP; 1747 1748 /* maybe the remote can't receive an Ethernet MTU */ 1749 if (net->mtu > (dev->hard_mtu - net->hard_header_len)) 1750 net->mtu = dev->hard_mtu - net->hard_header_len; 1751 } else if (!info->in || !info->out) 1752 status = usbnet_get_endpoints (dev, udev); 1753 else { 1754 dev->in = usb_rcvbulkpipe (xdev, info->in); 1755 dev->out = usb_sndbulkpipe (xdev, info->out); 1756 if (!(info->flags & FLAG_NO_SETINT)) 1757 status = usb_set_interface (xdev, 1758 interface->desc.bInterfaceNumber, 1759 interface->desc.bAlternateSetting); 1760 else 1761 status = 0; 1762 1763 } 1764 if (status >= 0 && dev->status) 1765 status = init_status (dev, udev); 1766 if (status < 0) 1767 goto out3; 1768 1769 if (!dev->rx_urb_size) 1770 dev->rx_urb_size = dev->hard_mtu; 1771 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); 1772 1773 /* let userspace know we have a random address */ 1774 if (ether_addr_equal(net->dev_addr, node_id)) 1775 net->addr_assign_type = NET_ADDR_RANDOM; 1776 1777 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1778 SET_NETDEV_DEVTYPE(net, &wlan_type); 1779 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1780 SET_NETDEV_DEVTYPE(net, &wwan_type); 1781 1782 /* initialize max rx_qlen and tx_qlen */ 1783 usbnet_update_max_qlen(dev); 1784 1785 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) && 1786 !(info->flags & FLAG_MULTI_PACKET)) { 1787 dev->padding_pkt = kzalloc(1, GFP_KERNEL); 1788 if (!dev->padding_pkt) { 1789 status = -ENOMEM; 1790 goto out4; 1791 } 1792 } 1793 1794 status = register_netdev (net); 1795 if (status) 1796 goto out5; 1797 netif_info(dev, probe, dev->net, 1798 "register '%s' at usb-%s-%s, %s, %pM\n", 1799 udev->dev.driver->name, 1800 xdev->bus->bus_name, xdev->devpath, 1801 dev->driver_info->description, 1802 net->dev_addr); 1803 1804 // ok, it's ready to go. 1805 usb_set_intfdata (udev, dev); 1806 1807 netif_device_attach (net); 1808 1809 if (dev->driver_info->flags & FLAG_LINK_INTR) 1810 usbnet_link_change(dev, 0, 0); 1811 1812 return 0; 1813 1814 out5: 1815 kfree(dev->padding_pkt); 1816 out4: 1817 usb_free_urb(dev->interrupt); 1818 out3: 1819 if (info->unbind) 1820 info->unbind (dev, udev); 1821 out1: 1822 /* subdrivers must undo all they did in bind() if they 1823 * fail it, but we may fail later and a deferred kevent 1824 * may trigger an error resubmitting itself and, worse, 1825 * schedule a timer. So we kill it all just in case. 1826 */ 1827 cancel_work_sync(&dev->kevent); 1828 del_timer_sync(&dev->delay); 1829 free_percpu(dev->stats64); 1830 out0: 1831 free_netdev(net); 1832 out: 1833 return status; 1834 } 1835 EXPORT_SYMBOL_GPL(usbnet_probe); 1836 1837 /*-------------------------------------------------------------------------*/ 1838 1839 /* 1840 * suspend the whole driver as soon as the first interface is suspended 1841 * resume only when the last interface is resumed 1842 */ 1843 1844 int usbnet_suspend (struct usb_interface *intf, pm_message_t message) 1845 { 1846 struct usbnet *dev = usb_get_intfdata(intf); 1847 1848 if (!dev->suspend_count++) { 1849 spin_lock_irq(&dev->txq.lock); 1850 /* don't autosuspend while transmitting */ 1851 if (dev->txq.qlen && PMSG_IS_AUTO(message)) { 1852 dev->suspend_count--; 1853 spin_unlock_irq(&dev->txq.lock); 1854 return -EBUSY; 1855 } else { 1856 set_bit(EVENT_DEV_ASLEEP, &dev->flags); 1857 spin_unlock_irq(&dev->txq.lock); 1858 } 1859 /* 1860 * accelerate emptying of the rx and queues, to avoid 1861 * having everything error out. 1862 */ 1863 netif_device_detach (dev->net); 1864 usbnet_terminate_urbs(dev); 1865 __usbnet_status_stop_force(dev); 1866 1867 /* 1868 * reattach so runtime management can use and 1869 * wake the device 1870 */ 1871 netif_device_attach (dev->net); 1872 } 1873 return 0; 1874 } 1875 EXPORT_SYMBOL_GPL(usbnet_suspend); 1876 1877 int usbnet_resume (struct usb_interface *intf) 1878 { 1879 struct usbnet *dev = usb_get_intfdata(intf); 1880 struct sk_buff *skb; 1881 struct urb *res; 1882 int retval; 1883 1884 if (!--dev->suspend_count) { 1885 /* resume interrupt URB if it was previously submitted */ 1886 __usbnet_status_start_force(dev, GFP_NOIO); 1887 1888 spin_lock_irq(&dev->txq.lock); 1889 while ((res = usb_get_from_anchor(&dev->deferred))) { 1890 1891 skb = (struct sk_buff *)res->context; 1892 retval = usb_submit_urb(res, GFP_ATOMIC); 1893 if (retval < 0) { 1894 dev_kfree_skb_any(skb); 1895 kfree(res->sg); 1896 usb_free_urb(res); 1897 usb_autopm_put_interface_async(dev->intf); 1898 } else { 1899 netif_trans_update(dev->net); 1900 __skb_queue_tail(&dev->txq, skb); 1901 } 1902 } 1903 1904 smp_mb(); 1905 clear_bit(EVENT_DEV_ASLEEP, &dev->flags); 1906 spin_unlock_irq(&dev->txq.lock); 1907 1908 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) { 1909 /* handle remote wakeup ASAP 1910 * we cannot race against stop 1911 */ 1912 if (netif_device_present(dev->net) && 1913 !timer_pending(&dev->delay) && 1914 !test_bit(EVENT_RX_HALT, &dev->flags)) 1915 rx_alloc_submit(dev, GFP_NOIO); 1916 1917 if (!(dev->txq.qlen >= TX_QLEN(dev))) 1918 netif_tx_wake_all_queues(dev->net); 1919 tasklet_schedule (&dev->bh); 1920 } 1921 } 1922 1923 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) 1924 usb_autopm_get_interface_no_resume(intf); 1925 1926 return 0; 1927 } 1928 EXPORT_SYMBOL_GPL(usbnet_resume); 1929 1930 /* 1931 * Either a subdriver implements manage_power, then it is assumed to always 1932 * be ready to be suspended or it reports the readiness to be suspended 1933 * explicitly 1934 */ 1935 void usbnet_device_suggests_idle(struct usbnet *dev) 1936 { 1937 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) { 1938 dev->intf->needs_remote_wakeup = 1; 1939 usb_autopm_put_interface_async(dev->intf); 1940 } 1941 } 1942 EXPORT_SYMBOL(usbnet_device_suggests_idle); 1943 1944 /* 1945 * For devices that can do without special commands 1946 */ 1947 int usbnet_manage_power(struct usbnet *dev, int on) 1948 { 1949 dev->intf->needs_remote_wakeup = on; 1950 return 0; 1951 } 1952 EXPORT_SYMBOL(usbnet_manage_power); 1953 1954 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset) 1955 { 1956 /* update link after link is reseted */ 1957 if (link && !need_reset) 1958 netif_carrier_on(dev->net); 1959 else 1960 netif_carrier_off(dev->net); 1961 1962 if (need_reset && link) 1963 usbnet_defer_kevent(dev, EVENT_LINK_RESET); 1964 else 1965 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE); 1966 } 1967 EXPORT_SYMBOL(usbnet_link_change); 1968 1969 /*-------------------------------------------------------------------------*/ 1970 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1971 u16 value, u16 index, void *data, u16 size) 1972 { 1973 void *buf = NULL; 1974 int err = -ENOMEM; 1975 1976 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x" 1977 " value=0x%04x index=0x%04x size=%d\n", 1978 cmd, reqtype, value, index, size); 1979 1980 if (size) { 1981 buf = kmalloc(size, GFP_KERNEL); 1982 if (!buf) 1983 goto out; 1984 } 1985 1986 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), 1987 cmd, reqtype, value, index, buf, size, 1988 USB_CTRL_GET_TIMEOUT); 1989 if (err > 0 && err <= size) { 1990 if (data) 1991 memcpy(data, buf, err); 1992 else 1993 netdev_dbg(dev->net, 1994 "Huh? Data requested but thrown away.\n"); 1995 } 1996 kfree(buf); 1997 out: 1998 return err; 1999 } 2000 2001 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 2002 u16 value, u16 index, const void *data, 2003 u16 size) 2004 { 2005 void *buf = NULL; 2006 int err = -ENOMEM; 2007 2008 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 2009 " value=0x%04x index=0x%04x size=%d\n", 2010 cmd, reqtype, value, index, size); 2011 2012 if (data) { 2013 buf = kmemdup(data, size, GFP_KERNEL); 2014 if (!buf) 2015 goto out; 2016 } else { 2017 if (size) { 2018 WARN_ON_ONCE(1); 2019 err = -EINVAL; 2020 goto out; 2021 } 2022 } 2023 2024 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), 2025 cmd, reqtype, value, index, buf, size, 2026 USB_CTRL_SET_TIMEOUT); 2027 kfree(buf); 2028 2029 out: 2030 return err; 2031 } 2032 2033 /* 2034 * The function can't be called inside suspend/resume callback, 2035 * otherwise deadlock will be caused. 2036 */ 2037 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 2038 u16 value, u16 index, void *data, u16 size) 2039 { 2040 int ret; 2041 2042 if (usb_autopm_get_interface(dev->intf) < 0) 2043 return -ENODEV; 2044 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index, 2045 data, size); 2046 usb_autopm_put_interface(dev->intf); 2047 return ret; 2048 } 2049 EXPORT_SYMBOL_GPL(usbnet_read_cmd); 2050 2051 /* 2052 * The function can't be called inside suspend/resume callback, 2053 * otherwise deadlock will be caused. 2054 */ 2055 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 2056 u16 value, u16 index, const void *data, u16 size) 2057 { 2058 int ret; 2059 2060 if (usb_autopm_get_interface(dev->intf) < 0) 2061 return -ENODEV; 2062 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index, 2063 data, size); 2064 usb_autopm_put_interface(dev->intf); 2065 return ret; 2066 } 2067 EXPORT_SYMBOL_GPL(usbnet_write_cmd); 2068 2069 /* 2070 * The function can be called inside suspend/resume callback safely 2071 * and should only be called by suspend/resume callback generally. 2072 */ 2073 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 2074 u16 value, u16 index, void *data, u16 size) 2075 { 2076 return __usbnet_read_cmd(dev, cmd, reqtype, value, index, 2077 data, size); 2078 } 2079 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm); 2080 2081 /* 2082 * The function can be called inside suspend/resume callback safely 2083 * and should only be called by suspend/resume callback generally. 2084 */ 2085 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 2086 u16 value, u16 index, const void *data, 2087 u16 size) 2088 { 2089 return __usbnet_write_cmd(dev, cmd, reqtype, value, index, 2090 data, size); 2091 } 2092 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm); 2093 2094 static void usbnet_async_cmd_cb(struct urb *urb) 2095 { 2096 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context; 2097 int status = urb->status; 2098 2099 if (status < 0) 2100 dev_dbg(&urb->dev->dev, "%s failed with %d", 2101 __func__, status); 2102 2103 kfree(req); 2104 usb_free_urb(urb); 2105 } 2106 2107 /* 2108 * The caller must make sure that device can't be put into suspend 2109 * state until the control URB completes. 2110 */ 2111 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype, 2112 u16 value, u16 index, const void *data, u16 size) 2113 { 2114 struct usb_ctrlrequest *req = NULL; 2115 struct urb *urb; 2116 int err = -ENOMEM; 2117 void *buf = NULL; 2118 2119 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 2120 " value=0x%04x index=0x%04x size=%d\n", 2121 cmd, reqtype, value, index, size); 2122 2123 urb = usb_alloc_urb(0, GFP_ATOMIC); 2124 if (!urb) 2125 goto fail; 2126 2127 if (data) { 2128 buf = kmemdup(data, size, GFP_ATOMIC); 2129 if (!buf) { 2130 netdev_err(dev->net, "Error allocating buffer" 2131 " in %s!\n", __func__); 2132 goto fail_free; 2133 } 2134 } 2135 2136 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC); 2137 if (!req) 2138 goto fail_free_buf; 2139 2140 req->bRequestType = reqtype; 2141 req->bRequest = cmd; 2142 req->wValue = cpu_to_le16(value); 2143 req->wIndex = cpu_to_le16(index); 2144 req->wLength = cpu_to_le16(size); 2145 2146 usb_fill_control_urb(urb, dev->udev, 2147 usb_sndctrlpipe(dev->udev, 0), 2148 (void *)req, buf, size, 2149 usbnet_async_cmd_cb, req); 2150 urb->transfer_flags |= URB_FREE_BUFFER; 2151 2152 err = usb_submit_urb(urb, GFP_ATOMIC); 2153 if (err < 0) { 2154 netdev_err(dev->net, "Error submitting the control" 2155 " message: status=%d\n", err); 2156 goto fail_free; 2157 } 2158 return 0; 2159 2160 fail_free_buf: 2161 kfree(buf); 2162 fail_free: 2163 kfree(req); 2164 usb_free_urb(urb); 2165 fail: 2166 return err; 2167 2168 } 2169 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async); 2170 /*-------------------------------------------------------------------------*/ 2171 2172 static int __init usbnet_init(void) 2173 { 2174 /* Compiler should optimize this out. */ 2175 BUILD_BUG_ON( 2176 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data)); 2177 2178 eth_random_addr(node_id); 2179 return 0; 2180 } 2181 module_init(usbnet_init); 2182 2183 static void __exit usbnet_exit(void) 2184 { 2185 } 2186 module_exit(usbnet_exit); 2187 2188 MODULE_AUTHOR("David Brownell"); 2189 MODULE_DESCRIPTION("USB network driver framework"); 2190 MODULE_LICENSE("GPL"); 2191