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 unsigned long flags; 319 int status; 320 321 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) { 322 skb_queue_tail(&dev->rxq_pause, skb); 323 return; 324 } 325 326 /* only update if unset to allow minidriver rx_fixup override */ 327 if (skb->protocol == 0) 328 skb->protocol = eth_type_trans (skb, dev->net); 329 330 flags = u64_stats_update_begin_irqsave(&stats64->syncp); 331 stats64->rx_packets++; 332 stats64->rx_bytes += skb->len; 333 u64_stats_update_end_irqrestore(&stats64->syncp, flags); 334 335 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n", 336 skb->len + sizeof (struct ethhdr), skb->protocol); 337 memset (skb->cb, 0, sizeof (struct skb_data)); 338 339 if (skb_defer_rx_timestamp(skb)) 340 return; 341 342 status = netif_rx (skb); 343 if (status != NET_RX_SUCCESS) 344 netif_dbg(dev, rx_err, dev->net, 345 "netif_rx status %d\n", status); 346 } 347 EXPORT_SYMBOL_GPL(usbnet_skb_return); 348 349 /* must be called if hard_mtu or rx_urb_size changed */ 350 void usbnet_update_max_qlen(struct usbnet *dev) 351 { 352 enum usb_device_speed speed = dev->udev->speed; 353 354 switch (speed) { 355 case USB_SPEED_HIGH: 356 dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size; 357 dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu; 358 break; 359 case USB_SPEED_SUPER: 360 case USB_SPEED_SUPER_PLUS: 361 /* 362 * Not take default 5ms qlen for super speed HC to 363 * save memory, and iperf tests show 2.5ms qlen can 364 * work well 365 */ 366 dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size; 367 dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu; 368 break; 369 default: 370 dev->rx_qlen = dev->tx_qlen = 4; 371 } 372 } 373 EXPORT_SYMBOL_GPL(usbnet_update_max_qlen); 374 375 376 /*------------------------------------------------------------------------- 377 * 378 * Network Device Driver (peer link to "Host Device", from USB host) 379 * 380 *-------------------------------------------------------------------------*/ 381 382 int usbnet_change_mtu (struct net_device *net, int new_mtu) 383 { 384 struct usbnet *dev = netdev_priv(net); 385 int ll_mtu = new_mtu + net->hard_header_len; 386 int old_hard_mtu = dev->hard_mtu; 387 int old_rx_urb_size = dev->rx_urb_size; 388 389 // no second zero-length packet read wanted after mtu-sized packets 390 if ((ll_mtu % dev->maxpacket) == 0) 391 return -EDOM; 392 net->mtu = new_mtu; 393 394 dev->hard_mtu = net->mtu + net->hard_header_len; 395 if (dev->rx_urb_size == old_hard_mtu) { 396 dev->rx_urb_size = dev->hard_mtu; 397 if (dev->rx_urb_size > old_rx_urb_size) { 398 usbnet_pause_rx(dev); 399 usbnet_unlink_rx_urbs(dev); 400 usbnet_resume_rx(dev); 401 } 402 } 403 404 /* max qlen depend on hard_mtu and rx_urb_size */ 405 usbnet_update_max_qlen(dev); 406 407 return 0; 408 } 409 EXPORT_SYMBOL_GPL(usbnet_change_mtu); 410 411 /* The caller must hold list->lock */ 412 static void __usbnet_queue_skb(struct sk_buff_head *list, 413 struct sk_buff *newsk, enum skb_state state) 414 { 415 struct skb_data *entry = (struct skb_data *) newsk->cb; 416 417 __skb_queue_tail(list, newsk); 418 entry->state = state; 419 } 420 421 /*-------------------------------------------------------------------------*/ 422 423 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from 424 * completion callbacks. 2.5 should have fixed those bugs... 425 */ 426 427 static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb, 428 struct sk_buff_head *list, enum skb_state state) 429 { 430 unsigned long flags; 431 enum skb_state old_state; 432 struct skb_data *entry = (struct skb_data *) skb->cb; 433 434 spin_lock_irqsave(&list->lock, flags); 435 old_state = entry->state; 436 entry->state = state; 437 __skb_unlink(skb, list); 438 439 /* defer_bh() is never called with list == &dev->done. 440 * spin_lock_nested() tells lockdep that it is OK to take 441 * dev->done.lock here with list->lock held. 442 */ 443 spin_lock_nested(&dev->done.lock, SINGLE_DEPTH_NESTING); 444 445 __skb_queue_tail(&dev->done, skb); 446 if (dev->done.qlen == 1) 447 tasklet_schedule(&dev->bh); 448 spin_unlock(&dev->done.lock); 449 spin_unlock_irqrestore(&list->lock, flags); 450 return old_state; 451 } 452 453 /* some work can't be done in tasklets, so we use keventd 454 * 455 * NOTE: annoying asymmetry: if it's active, schedule_work() fails, 456 * but tasklet_schedule() doesn't. hope the failure is rare. 457 */ 458 void usbnet_defer_kevent (struct usbnet *dev, int work) 459 { 460 set_bit (work, &dev->flags); 461 if (!schedule_work (&dev->kevent)) 462 netdev_dbg(dev->net, "kevent %d may have been dropped\n", work); 463 else 464 netdev_dbg(dev->net, "kevent %d scheduled\n", work); 465 } 466 EXPORT_SYMBOL_GPL(usbnet_defer_kevent); 467 468 /*-------------------------------------------------------------------------*/ 469 470 static void rx_complete (struct urb *urb); 471 472 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags) 473 { 474 struct sk_buff *skb; 475 struct skb_data *entry; 476 int retval = 0; 477 unsigned long lockflags; 478 size_t size = dev->rx_urb_size; 479 480 /* prevent rx skb allocation when error ratio is high */ 481 if (test_bit(EVENT_RX_KILL, &dev->flags)) { 482 usb_free_urb(urb); 483 return -ENOLINK; 484 } 485 486 if (test_bit(EVENT_NO_IP_ALIGN, &dev->flags)) 487 skb = __netdev_alloc_skb(dev->net, size, flags); 488 else 489 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags); 490 if (!skb) { 491 netif_dbg(dev, rx_err, dev->net, "no rx skb\n"); 492 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 493 usb_free_urb (urb); 494 return -ENOMEM; 495 } 496 497 entry = (struct skb_data *) skb->cb; 498 entry->urb = urb; 499 entry->dev = dev; 500 entry->length = 0; 501 502 usb_fill_bulk_urb (urb, dev->udev, dev->in, 503 skb->data, size, rx_complete, skb); 504 505 spin_lock_irqsave (&dev->rxq.lock, lockflags); 506 507 if (netif_running (dev->net) && 508 netif_device_present (dev->net) && 509 !test_bit (EVENT_RX_HALT, &dev->flags) && 510 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) { 511 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) { 512 case -EPIPE: 513 usbnet_defer_kevent (dev, EVENT_RX_HALT); 514 break; 515 case -ENOMEM: 516 usbnet_defer_kevent (dev, EVENT_RX_MEMORY); 517 break; 518 case -ENODEV: 519 netif_dbg(dev, ifdown, dev->net, "device gone\n"); 520 netif_device_detach (dev->net); 521 break; 522 case -EHOSTUNREACH: 523 retval = -ENOLINK; 524 break; 525 default: 526 netif_dbg(dev, rx_err, dev->net, 527 "rx submit, %d\n", retval); 528 tasklet_schedule (&dev->bh); 529 break; 530 case 0: 531 __usbnet_queue_skb(&dev->rxq, skb, rx_start); 532 } 533 } else { 534 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n"); 535 retval = -ENOLINK; 536 } 537 spin_unlock_irqrestore (&dev->rxq.lock, lockflags); 538 if (retval) { 539 dev_kfree_skb_any (skb); 540 usb_free_urb (urb); 541 } 542 return retval; 543 } 544 545 546 /*-------------------------------------------------------------------------*/ 547 548 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb) 549 { 550 if (dev->driver_info->rx_fixup && 551 !dev->driver_info->rx_fixup (dev, skb)) { 552 /* With RX_ASSEMBLE, rx_fixup() must update counters */ 553 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE)) 554 dev->net->stats.rx_errors++; 555 goto done; 556 } 557 // else network stack removes extra byte if we forced a short packet 558 559 /* all data was already cloned from skb inside the driver */ 560 if (dev->driver_info->flags & FLAG_MULTI_PACKET) 561 goto done; 562 563 if (skb->len < ETH_HLEN) { 564 dev->net->stats.rx_errors++; 565 dev->net->stats.rx_length_errors++; 566 netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len); 567 } else { 568 usbnet_skb_return(dev, skb); 569 return; 570 } 571 572 done: 573 skb_queue_tail(&dev->done, skb); 574 } 575 576 /*-------------------------------------------------------------------------*/ 577 578 static void rx_complete (struct urb *urb) 579 { 580 struct sk_buff *skb = (struct sk_buff *) urb->context; 581 struct skb_data *entry = (struct skb_data *) skb->cb; 582 struct usbnet *dev = entry->dev; 583 int urb_status = urb->status; 584 enum skb_state state; 585 586 skb_put (skb, urb->actual_length); 587 state = rx_done; 588 entry->urb = NULL; 589 590 switch (urb_status) { 591 /* success */ 592 case 0: 593 break; 594 595 /* stalls need manual reset. this is rare ... except that 596 * when going through USB 2.0 TTs, unplug appears this way. 597 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ 598 * storm, recovering as needed. 599 */ 600 case -EPIPE: 601 dev->net->stats.rx_errors++; 602 usbnet_defer_kevent (dev, EVENT_RX_HALT); 603 // FALLTHROUGH 604 605 /* software-driven interface shutdown */ 606 case -ECONNRESET: /* async unlink */ 607 case -ESHUTDOWN: /* hardware gone */ 608 netif_dbg(dev, ifdown, dev->net, 609 "rx shutdown, code %d\n", urb_status); 610 goto block; 611 612 /* we get controller i/o faults during hub_wq disconnect() delays. 613 * throttle down resubmits, to avoid log floods; just temporarily, 614 * so we still recover when the fault isn't a hub_wq delay. 615 */ 616 case -EPROTO: 617 case -ETIME: 618 case -EILSEQ: 619 dev->net->stats.rx_errors++; 620 if (!timer_pending (&dev->delay)) { 621 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES); 622 netif_dbg(dev, link, dev->net, 623 "rx throttle %d\n", urb_status); 624 } 625 block: 626 state = rx_cleanup; 627 entry->urb = urb; 628 urb = NULL; 629 break; 630 631 /* data overrun ... flush fifo? */ 632 case -EOVERFLOW: 633 dev->net->stats.rx_over_errors++; 634 // FALLTHROUGH 635 636 default: 637 state = rx_cleanup; 638 dev->net->stats.rx_errors++; 639 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status); 640 break; 641 } 642 643 /* stop rx if packet error rate is high */ 644 if (++dev->pkt_cnt > 30) { 645 dev->pkt_cnt = 0; 646 dev->pkt_err = 0; 647 } else { 648 if (state == rx_cleanup) 649 dev->pkt_err++; 650 if (dev->pkt_err > 20) 651 set_bit(EVENT_RX_KILL, &dev->flags); 652 } 653 654 state = defer_bh(dev, skb, &dev->rxq, state); 655 656 if (urb) { 657 if (netif_running (dev->net) && 658 !test_bit (EVENT_RX_HALT, &dev->flags) && 659 state != unlink_start) { 660 rx_submit (dev, urb, GFP_ATOMIC); 661 usb_mark_last_busy(dev->udev); 662 return; 663 } 664 usb_free_urb (urb); 665 } 666 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n"); 667 } 668 669 /*-------------------------------------------------------------------------*/ 670 void usbnet_pause_rx(struct usbnet *dev) 671 { 672 set_bit(EVENT_RX_PAUSED, &dev->flags); 673 674 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n"); 675 } 676 EXPORT_SYMBOL_GPL(usbnet_pause_rx); 677 678 void usbnet_resume_rx(struct usbnet *dev) 679 { 680 struct sk_buff *skb; 681 int num = 0; 682 683 clear_bit(EVENT_RX_PAUSED, &dev->flags); 684 685 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) { 686 usbnet_skb_return(dev, skb); 687 num++; 688 } 689 690 tasklet_schedule(&dev->bh); 691 692 netif_dbg(dev, rx_status, dev->net, 693 "paused rx queue disabled, %d skbs requeued\n", num); 694 } 695 EXPORT_SYMBOL_GPL(usbnet_resume_rx); 696 697 void usbnet_purge_paused_rxq(struct usbnet *dev) 698 { 699 skb_queue_purge(&dev->rxq_pause); 700 } 701 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq); 702 703 /*-------------------------------------------------------------------------*/ 704 705 // unlink pending rx/tx; completion handlers do all other cleanup 706 707 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q) 708 { 709 unsigned long flags; 710 struct sk_buff *skb; 711 int count = 0; 712 713 spin_lock_irqsave (&q->lock, flags); 714 while (!skb_queue_empty(q)) { 715 struct skb_data *entry; 716 struct urb *urb; 717 int retval; 718 719 skb_queue_walk(q, skb) { 720 entry = (struct skb_data *) skb->cb; 721 if (entry->state != unlink_start) 722 goto found; 723 } 724 break; 725 found: 726 entry->state = unlink_start; 727 urb = entry->urb; 728 729 /* 730 * Get reference count of the URB to avoid it to be 731 * freed during usb_unlink_urb, which may trigger 732 * use-after-free problem inside usb_unlink_urb since 733 * usb_unlink_urb is always racing with .complete 734 * handler(include defer_bh). 735 */ 736 usb_get_urb(urb); 737 spin_unlock_irqrestore(&q->lock, flags); 738 // during some PM-driven resume scenarios, 739 // these (async) unlinks complete immediately 740 retval = usb_unlink_urb (urb); 741 if (retval != -EINPROGRESS && retval != 0) 742 netdev_dbg(dev->net, "unlink urb err, %d\n", retval); 743 else 744 count++; 745 usb_put_urb(urb); 746 spin_lock_irqsave(&q->lock, flags); 747 } 748 spin_unlock_irqrestore (&q->lock, flags); 749 return count; 750 } 751 752 // Flush all pending rx urbs 753 // minidrivers may need to do this when the MTU changes 754 755 void usbnet_unlink_rx_urbs(struct usbnet *dev) 756 { 757 if (netif_running(dev->net)) { 758 (void) unlink_urbs (dev, &dev->rxq); 759 tasklet_schedule(&dev->bh); 760 } 761 } 762 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs); 763 764 /*-------------------------------------------------------------------------*/ 765 766 static void wait_skb_queue_empty(struct sk_buff_head *q) 767 { 768 unsigned long flags; 769 770 spin_lock_irqsave(&q->lock, flags); 771 while (!skb_queue_empty(q)) { 772 spin_unlock_irqrestore(&q->lock, flags); 773 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS)); 774 set_current_state(TASK_UNINTERRUPTIBLE); 775 spin_lock_irqsave(&q->lock, flags); 776 } 777 spin_unlock_irqrestore(&q->lock, flags); 778 } 779 780 // precondition: never called in_interrupt 781 static void usbnet_terminate_urbs(struct usbnet *dev) 782 { 783 DECLARE_WAITQUEUE(wait, current); 784 int temp; 785 786 /* ensure there are no more active urbs */ 787 add_wait_queue(&dev->wait, &wait); 788 set_current_state(TASK_UNINTERRUPTIBLE); 789 temp = unlink_urbs(dev, &dev->txq) + 790 unlink_urbs(dev, &dev->rxq); 791 792 /* maybe wait for deletions to finish. */ 793 wait_skb_queue_empty(&dev->rxq); 794 wait_skb_queue_empty(&dev->txq); 795 wait_skb_queue_empty(&dev->done); 796 netif_dbg(dev, ifdown, dev->net, 797 "waited for %d urb completions\n", temp); 798 set_current_state(TASK_RUNNING); 799 remove_wait_queue(&dev->wait, &wait); 800 } 801 802 int usbnet_stop (struct net_device *net) 803 { 804 struct usbnet *dev = netdev_priv(net); 805 struct driver_info *info = dev->driver_info; 806 int retval, pm, mpn; 807 808 clear_bit(EVENT_DEV_OPEN, &dev->flags); 809 netif_stop_queue (net); 810 811 netif_info(dev, ifdown, dev->net, 812 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n", 813 net->stats.rx_packets, net->stats.tx_packets, 814 net->stats.rx_errors, net->stats.tx_errors); 815 816 /* to not race resume */ 817 pm = usb_autopm_get_interface(dev->intf); 818 /* allow minidriver to stop correctly (wireless devices to turn off 819 * radio etc) */ 820 if (info->stop) { 821 retval = info->stop(dev); 822 if (retval < 0) 823 netif_info(dev, ifdown, dev->net, 824 "stop fail (%d) usbnet usb-%s-%s, %s\n", 825 retval, 826 dev->udev->bus->bus_name, dev->udev->devpath, 827 info->description); 828 } 829 830 if (!(info->flags & FLAG_AVOID_UNLINK_URBS)) 831 usbnet_terminate_urbs(dev); 832 833 usbnet_status_stop(dev); 834 835 usbnet_purge_paused_rxq(dev); 836 837 mpn = !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags); 838 839 /* deferred work (task, timer, softirq) must also stop. 840 * can't flush_scheduled_work() until we drop rtnl (later), 841 * else workers could deadlock; so make workers a NOP. 842 */ 843 dev->flags = 0; 844 del_timer_sync (&dev->delay); 845 tasklet_kill (&dev->bh); 846 if (!pm) 847 usb_autopm_put_interface(dev->intf); 848 849 if (info->manage_power && mpn) 850 info->manage_power(dev, 0); 851 else 852 usb_autopm_put_interface(dev->intf); 853 854 return 0; 855 } 856 EXPORT_SYMBOL_GPL(usbnet_stop); 857 858 /*-------------------------------------------------------------------------*/ 859 860 // posts reads, and enables write queuing 861 862 // precondition: never called in_interrupt 863 864 int usbnet_open (struct net_device *net) 865 { 866 struct usbnet *dev = netdev_priv(net); 867 int retval; 868 struct driver_info *info = dev->driver_info; 869 870 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) { 871 netif_info(dev, ifup, dev->net, 872 "resumption fail (%d) usbnet usb-%s-%s, %s\n", 873 retval, 874 dev->udev->bus->bus_name, 875 dev->udev->devpath, 876 info->description); 877 goto done_nopm; 878 } 879 880 // put into "known safe" state 881 if (info->reset && (retval = info->reset (dev)) < 0) { 882 netif_info(dev, ifup, dev->net, 883 "open reset fail (%d) usbnet usb-%s-%s, %s\n", 884 retval, 885 dev->udev->bus->bus_name, 886 dev->udev->devpath, 887 info->description); 888 goto done; 889 } 890 891 /* hard_mtu or rx_urb_size may change in reset() */ 892 usbnet_update_max_qlen(dev); 893 894 // insist peer be connected 895 if (info->check_connect && (retval = info->check_connect (dev)) < 0) { 896 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval); 897 goto done; 898 } 899 900 /* start any status interrupt transfer */ 901 if (dev->interrupt) { 902 retval = usbnet_status_start(dev, GFP_KERNEL); 903 if (retval < 0) { 904 netif_err(dev, ifup, dev->net, 905 "intr submit %d\n", retval); 906 goto done; 907 } 908 } 909 910 set_bit(EVENT_DEV_OPEN, &dev->flags); 911 netif_start_queue (net); 912 netif_info(dev, ifup, dev->net, 913 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n", 914 (int)RX_QLEN(dev), (int)TX_QLEN(dev), 915 dev->net->mtu, 916 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" : 917 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" : 918 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" : 919 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" : 920 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" : 921 "simple"); 922 923 /* reset rx error state */ 924 dev->pkt_cnt = 0; 925 dev->pkt_err = 0; 926 clear_bit(EVENT_RX_KILL, &dev->flags); 927 928 // delay posting reads until we're fully open 929 tasklet_schedule (&dev->bh); 930 if (info->manage_power) { 931 retval = info->manage_power(dev, 1); 932 if (retval < 0) { 933 retval = 0; 934 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags); 935 } else { 936 usb_autopm_put_interface(dev->intf); 937 } 938 } 939 return retval; 940 done: 941 usb_autopm_put_interface(dev->intf); 942 done_nopm: 943 return retval; 944 } 945 EXPORT_SYMBOL_GPL(usbnet_open); 946 947 /*-------------------------------------------------------------------------*/ 948 949 /* ethtool methods; minidrivers may need to add some more, but 950 * they'll probably want to use this base set. 951 */ 952 953 int usbnet_get_link_ksettings(struct net_device *net, 954 struct ethtool_link_ksettings *cmd) 955 { 956 struct usbnet *dev = netdev_priv(net); 957 958 if (!dev->mii.mdio_read) 959 return -EOPNOTSUPP; 960 961 mii_ethtool_get_link_ksettings(&dev->mii, cmd); 962 963 return 0; 964 } 965 EXPORT_SYMBOL_GPL(usbnet_get_link_ksettings); 966 967 int usbnet_set_link_ksettings(struct net_device *net, 968 const struct ethtool_link_ksettings *cmd) 969 { 970 struct usbnet *dev = netdev_priv(net); 971 int retval; 972 973 if (!dev->mii.mdio_write) 974 return -EOPNOTSUPP; 975 976 retval = mii_ethtool_set_link_ksettings(&dev->mii, cmd); 977 978 /* link speed/duplex might have changed */ 979 if (dev->driver_info->link_reset) 980 dev->driver_info->link_reset(dev); 981 982 /* hard_mtu or rx_urb_size may change in link_reset() */ 983 usbnet_update_max_qlen(dev); 984 985 return retval; 986 } 987 EXPORT_SYMBOL_GPL(usbnet_set_link_ksettings); 988 989 void usbnet_get_stats64(struct net_device *net, struct rtnl_link_stats64 *stats) 990 { 991 struct usbnet *dev = netdev_priv(net); 992 unsigned int start; 993 int cpu; 994 995 netdev_stats_to_stats64(stats, &net->stats); 996 997 for_each_possible_cpu(cpu) { 998 struct pcpu_sw_netstats *stats64; 999 u64 rx_packets, rx_bytes; 1000 u64 tx_packets, tx_bytes; 1001 1002 stats64 = per_cpu_ptr(dev->stats64, cpu); 1003 1004 do { 1005 start = u64_stats_fetch_begin_irq(&stats64->syncp); 1006 rx_packets = stats64->rx_packets; 1007 rx_bytes = stats64->rx_bytes; 1008 tx_packets = stats64->tx_packets; 1009 tx_bytes = stats64->tx_bytes; 1010 } while (u64_stats_fetch_retry_irq(&stats64->syncp, start)); 1011 1012 stats->rx_packets += rx_packets; 1013 stats->rx_bytes += rx_bytes; 1014 stats->tx_packets += tx_packets; 1015 stats->tx_bytes += tx_bytes; 1016 } 1017 } 1018 EXPORT_SYMBOL_GPL(usbnet_get_stats64); 1019 1020 u32 usbnet_get_link (struct net_device *net) 1021 { 1022 struct usbnet *dev = netdev_priv(net); 1023 1024 /* If a check_connect is defined, return its result */ 1025 if (dev->driver_info->check_connect) 1026 return dev->driver_info->check_connect (dev) == 0; 1027 1028 /* if the device has mii operations, use those */ 1029 if (dev->mii.mdio_read) 1030 return mii_link_ok(&dev->mii); 1031 1032 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */ 1033 return ethtool_op_get_link(net); 1034 } 1035 EXPORT_SYMBOL_GPL(usbnet_get_link); 1036 1037 int usbnet_nway_reset(struct net_device *net) 1038 { 1039 struct usbnet *dev = netdev_priv(net); 1040 1041 if (!dev->mii.mdio_write) 1042 return -EOPNOTSUPP; 1043 1044 return mii_nway_restart(&dev->mii); 1045 } 1046 EXPORT_SYMBOL_GPL(usbnet_nway_reset); 1047 1048 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info) 1049 { 1050 struct usbnet *dev = netdev_priv(net); 1051 1052 strlcpy (info->driver, dev->driver_name, sizeof info->driver); 1053 strlcpy (info->version, DRIVER_VERSION, sizeof info->version); 1054 strlcpy (info->fw_version, dev->driver_info->description, 1055 sizeof info->fw_version); 1056 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info); 1057 } 1058 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo); 1059 1060 u32 usbnet_get_msglevel (struct net_device *net) 1061 { 1062 struct usbnet *dev = netdev_priv(net); 1063 1064 return dev->msg_enable; 1065 } 1066 EXPORT_SYMBOL_GPL(usbnet_get_msglevel); 1067 1068 void usbnet_set_msglevel (struct net_device *net, u32 level) 1069 { 1070 struct usbnet *dev = netdev_priv(net); 1071 1072 dev->msg_enable = level; 1073 } 1074 EXPORT_SYMBOL_GPL(usbnet_set_msglevel); 1075 1076 /* drivers may override default ethtool_ops in their bind() routine */ 1077 static const struct ethtool_ops usbnet_ethtool_ops = { 1078 .get_link = usbnet_get_link, 1079 .nway_reset = usbnet_nway_reset, 1080 .get_drvinfo = usbnet_get_drvinfo, 1081 .get_msglevel = usbnet_get_msglevel, 1082 .set_msglevel = usbnet_set_msglevel, 1083 .get_ts_info = ethtool_op_get_ts_info, 1084 .get_link_ksettings = usbnet_get_link_ksettings, 1085 .set_link_ksettings = usbnet_set_link_ksettings, 1086 }; 1087 1088 /*-------------------------------------------------------------------------*/ 1089 1090 static void __handle_link_change(struct usbnet *dev) 1091 { 1092 if (!test_bit(EVENT_DEV_OPEN, &dev->flags)) 1093 return; 1094 1095 if (!netif_carrier_ok(dev->net)) { 1096 /* kill URBs for reading packets to save bus bandwidth */ 1097 unlink_urbs(dev, &dev->rxq); 1098 1099 /* 1100 * tx_timeout will unlink URBs for sending packets and 1101 * tx queue is stopped by netcore after link becomes off 1102 */ 1103 } else { 1104 /* submitting URBs for reading packets */ 1105 tasklet_schedule(&dev->bh); 1106 } 1107 1108 /* hard_mtu or rx_urb_size may change during link change */ 1109 usbnet_update_max_qlen(dev); 1110 1111 clear_bit(EVENT_LINK_CHANGE, &dev->flags); 1112 } 1113 1114 static void usbnet_set_rx_mode(struct net_device *net) 1115 { 1116 struct usbnet *dev = netdev_priv(net); 1117 1118 usbnet_defer_kevent(dev, EVENT_SET_RX_MODE); 1119 } 1120 1121 static void __handle_set_rx_mode(struct usbnet *dev) 1122 { 1123 if (dev->driver_info->set_rx_mode) 1124 (dev->driver_info->set_rx_mode)(dev); 1125 1126 clear_bit(EVENT_SET_RX_MODE, &dev->flags); 1127 } 1128 1129 /* work that cannot be done in interrupt context uses keventd. 1130 * 1131 * NOTE: with 2.5 we could do more of this using completion callbacks, 1132 * especially now that control transfers can be queued. 1133 */ 1134 static void 1135 usbnet_deferred_kevent (struct work_struct *work) 1136 { 1137 struct usbnet *dev = 1138 container_of(work, struct usbnet, kevent); 1139 int status; 1140 1141 /* usb_clear_halt() needs a thread context */ 1142 if (test_bit (EVENT_TX_HALT, &dev->flags)) { 1143 unlink_urbs (dev, &dev->txq); 1144 status = usb_autopm_get_interface(dev->intf); 1145 if (status < 0) 1146 goto fail_pipe; 1147 status = usb_clear_halt (dev->udev, dev->out); 1148 usb_autopm_put_interface(dev->intf); 1149 if (status < 0 && 1150 status != -EPIPE && 1151 status != -ESHUTDOWN) { 1152 if (netif_msg_tx_err (dev)) 1153 fail_pipe: 1154 netdev_err(dev->net, "can't clear tx halt, status %d\n", 1155 status); 1156 } else { 1157 clear_bit (EVENT_TX_HALT, &dev->flags); 1158 if (status != -ESHUTDOWN) 1159 netif_wake_queue (dev->net); 1160 } 1161 } 1162 if (test_bit (EVENT_RX_HALT, &dev->flags)) { 1163 unlink_urbs (dev, &dev->rxq); 1164 status = usb_autopm_get_interface(dev->intf); 1165 if (status < 0) 1166 goto fail_halt; 1167 status = usb_clear_halt (dev->udev, dev->in); 1168 usb_autopm_put_interface(dev->intf); 1169 if (status < 0 && 1170 status != -EPIPE && 1171 status != -ESHUTDOWN) { 1172 if (netif_msg_rx_err (dev)) 1173 fail_halt: 1174 netdev_err(dev->net, "can't clear rx halt, status %d\n", 1175 status); 1176 } else { 1177 clear_bit (EVENT_RX_HALT, &dev->flags); 1178 tasklet_schedule (&dev->bh); 1179 } 1180 } 1181 1182 /* tasklet could resubmit itself forever if memory is tight */ 1183 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) { 1184 struct urb *urb = NULL; 1185 int resched = 1; 1186 1187 if (netif_running (dev->net)) 1188 urb = usb_alloc_urb (0, GFP_KERNEL); 1189 else 1190 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1191 if (urb != NULL) { 1192 clear_bit (EVENT_RX_MEMORY, &dev->flags); 1193 status = usb_autopm_get_interface(dev->intf); 1194 if (status < 0) { 1195 usb_free_urb(urb); 1196 goto fail_lowmem; 1197 } 1198 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK) 1199 resched = 0; 1200 usb_autopm_put_interface(dev->intf); 1201 fail_lowmem: 1202 if (resched) 1203 tasklet_schedule (&dev->bh); 1204 } 1205 } 1206 1207 if (test_bit (EVENT_LINK_RESET, &dev->flags)) { 1208 struct driver_info *info = dev->driver_info; 1209 int retval = 0; 1210 1211 clear_bit (EVENT_LINK_RESET, &dev->flags); 1212 status = usb_autopm_get_interface(dev->intf); 1213 if (status < 0) 1214 goto skip_reset; 1215 if(info->link_reset && (retval = info->link_reset(dev)) < 0) { 1216 usb_autopm_put_interface(dev->intf); 1217 skip_reset: 1218 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n", 1219 retval, 1220 dev->udev->bus->bus_name, 1221 dev->udev->devpath, 1222 info->description); 1223 } else { 1224 usb_autopm_put_interface(dev->intf); 1225 } 1226 1227 /* handle link change from link resetting */ 1228 __handle_link_change(dev); 1229 } 1230 1231 if (test_bit (EVENT_LINK_CHANGE, &dev->flags)) 1232 __handle_link_change(dev); 1233 1234 if (test_bit (EVENT_SET_RX_MODE, &dev->flags)) 1235 __handle_set_rx_mode(dev); 1236 1237 1238 if (dev->flags) 1239 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags); 1240 } 1241 1242 /*-------------------------------------------------------------------------*/ 1243 1244 static void tx_complete (struct urb *urb) 1245 { 1246 struct sk_buff *skb = (struct sk_buff *) urb->context; 1247 struct skb_data *entry = (struct skb_data *) skb->cb; 1248 struct usbnet *dev = entry->dev; 1249 1250 if (urb->status == 0) { 1251 struct pcpu_sw_netstats *stats64 = this_cpu_ptr(dev->stats64); 1252 unsigned long flags; 1253 1254 flags = u64_stats_update_begin_irqsave(&stats64->syncp); 1255 stats64->tx_packets += entry->packets; 1256 stats64->tx_bytes += entry->length; 1257 u64_stats_update_end_irqrestore(&stats64->syncp, flags); 1258 } else { 1259 dev->net->stats.tx_errors++; 1260 1261 switch (urb->status) { 1262 case -EPIPE: 1263 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1264 break; 1265 1266 /* software-driven interface shutdown */ 1267 case -ECONNRESET: // async unlink 1268 case -ESHUTDOWN: // hardware gone 1269 break; 1270 1271 /* like rx, tx gets controller i/o faults during hub_wq 1272 * delays and so it uses the same throttling mechanism. 1273 */ 1274 case -EPROTO: 1275 case -ETIME: 1276 case -EILSEQ: 1277 usb_mark_last_busy(dev->udev); 1278 if (!timer_pending (&dev->delay)) { 1279 mod_timer (&dev->delay, 1280 jiffies + THROTTLE_JIFFIES); 1281 netif_dbg(dev, link, dev->net, 1282 "tx throttle %d\n", urb->status); 1283 } 1284 netif_stop_queue (dev->net); 1285 break; 1286 default: 1287 netif_dbg(dev, tx_err, dev->net, 1288 "tx err %d\n", entry->urb->status); 1289 break; 1290 } 1291 } 1292 1293 usb_autopm_put_interface_async(dev->intf); 1294 (void) defer_bh(dev, skb, &dev->txq, tx_done); 1295 } 1296 1297 /*-------------------------------------------------------------------------*/ 1298 1299 void usbnet_tx_timeout (struct net_device *net) 1300 { 1301 struct usbnet *dev = netdev_priv(net); 1302 1303 unlink_urbs (dev, &dev->txq); 1304 tasklet_schedule (&dev->bh); 1305 /* this needs to be handled individually because the generic layer 1306 * doesn't know what is sufficient and could not restore private 1307 * information if a remedy of an unconditional reset were used. 1308 */ 1309 if (dev->driver_info->recover) 1310 (dev->driver_info->recover)(dev); 1311 } 1312 EXPORT_SYMBOL_GPL(usbnet_tx_timeout); 1313 1314 /*-------------------------------------------------------------------------*/ 1315 1316 static int build_dma_sg(const struct sk_buff *skb, struct urb *urb) 1317 { 1318 unsigned num_sgs, total_len = 0; 1319 int i, s = 0; 1320 1321 num_sgs = skb_shinfo(skb)->nr_frags + 1; 1322 if (num_sgs == 1) 1323 return 0; 1324 1325 /* reserve one for zero packet */ 1326 urb->sg = kmalloc((num_sgs + 1) * sizeof(struct scatterlist), 1327 GFP_ATOMIC); 1328 if (!urb->sg) 1329 return -ENOMEM; 1330 1331 urb->num_sgs = num_sgs; 1332 sg_init_table(urb->sg, urb->num_sgs + 1); 1333 1334 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb)); 1335 total_len += skb_headlen(skb); 1336 1337 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1338 struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i]; 1339 1340 total_len += skb_frag_size(f); 1341 sg_set_page(&urb->sg[i + s], f->page.p, f->size, 1342 f->page_offset); 1343 } 1344 urb->transfer_buffer_length = total_len; 1345 1346 return 1; 1347 } 1348 1349 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb, 1350 struct net_device *net) 1351 { 1352 struct usbnet *dev = netdev_priv(net); 1353 unsigned int length; 1354 struct urb *urb = NULL; 1355 struct skb_data *entry; 1356 struct driver_info *info = dev->driver_info; 1357 unsigned long flags; 1358 int retval; 1359 1360 if (skb) 1361 skb_tx_timestamp(skb); 1362 1363 // some devices want funky USB-level framing, for 1364 // win32 driver (usually) and/or hardware quirks 1365 if (info->tx_fixup) { 1366 skb = info->tx_fixup (dev, skb, GFP_ATOMIC); 1367 if (!skb) { 1368 /* packet collected; minidriver waiting for more */ 1369 if (info->flags & FLAG_MULTI_PACKET) 1370 goto not_drop; 1371 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n"); 1372 goto drop; 1373 } 1374 } 1375 1376 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) { 1377 netif_dbg(dev, tx_err, dev->net, "no urb\n"); 1378 goto drop; 1379 } 1380 1381 entry = (struct skb_data *) skb->cb; 1382 entry->urb = urb; 1383 entry->dev = dev; 1384 1385 usb_fill_bulk_urb (urb, dev->udev, dev->out, 1386 skb->data, skb->len, tx_complete, skb); 1387 if (dev->can_dma_sg) { 1388 if (build_dma_sg(skb, urb) < 0) 1389 goto drop; 1390 } 1391 length = urb->transfer_buffer_length; 1392 1393 /* don't assume the hardware handles USB_ZERO_PACKET 1394 * NOTE: strictly conforming cdc-ether devices should expect 1395 * the ZLP here, but ignore the one-byte packet. 1396 * NOTE2: CDC NCM specification is different from CDC ECM when 1397 * handling ZLP/short packets, so cdc_ncm driver will make short 1398 * packet itself if needed. 1399 */ 1400 if (length % dev->maxpacket == 0) { 1401 if (!(info->flags & FLAG_SEND_ZLP)) { 1402 if (!(info->flags & FLAG_MULTI_PACKET)) { 1403 length++; 1404 if (skb_tailroom(skb) && !urb->num_sgs) { 1405 skb->data[skb->len] = 0; 1406 __skb_put(skb, 1); 1407 } else if (urb->num_sgs) 1408 sg_set_buf(&urb->sg[urb->num_sgs++], 1409 dev->padding_pkt, 1); 1410 } 1411 } else 1412 urb->transfer_flags |= URB_ZERO_PACKET; 1413 } 1414 urb->transfer_buffer_length = length; 1415 1416 if (info->flags & FLAG_MULTI_PACKET) { 1417 /* Driver has set number of packets and a length delta. 1418 * Calculate the complete length and ensure that it's 1419 * positive. 1420 */ 1421 entry->length += length; 1422 if (WARN_ON_ONCE(entry->length <= 0)) 1423 entry->length = length; 1424 } else { 1425 usbnet_set_skb_tx_stats(skb, 1, length); 1426 } 1427 1428 spin_lock_irqsave(&dev->txq.lock, flags); 1429 retval = usb_autopm_get_interface_async(dev->intf); 1430 if (retval < 0) { 1431 spin_unlock_irqrestore(&dev->txq.lock, flags); 1432 goto drop; 1433 } 1434 1435 #ifdef CONFIG_PM 1436 /* if this triggers the device is still a sleep */ 1437 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) { 1438 /* transmission will be done in resume */ 1439 usb_anchor_urb(urb, &dev->deferred); 1440 /* no use to process more packets */ 1441 netif_stop_queue(net); 1442 usb_put_urb(urb); 1443 spin_unlock_irqrestore(&dev->txq.lock, flags); 1444 netdev_dbg(dev->net, "Delaying transmission for resumption\n"); 1445 goto deferred; 1446 } 1447 #endif 1448 1449 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) { 1450 case -EPIPE: 1451 netif_stop_queue (net); 1452 usbnet_defer_kevent (dev, EVENT_TX_HALT); 1453 usb_autopm_put_interface_async(dev->intf); 1454 break; 1455 default: 1456 usb_autopm_put_interface_async(dev->intf); 1457 netif_dbg(dev, tx_err, dev->net, 1458 "tx: submit urb err %d\n", retval); 1459 break; 1460 case 0: 1461 netif_trans_update(net); 1462 __usbnet_queue_skb(&dev->txq, skb, tx_start); 1463 if (dev->txq.qlen >= TX_QLEN (dev)) 1464 netif_stop_queue (net); 1465 } 1466 spin_unlock_irqrestore (&dev->txq.lock, flags); 1467 1468 if (retval) { 1469 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval); 1470 drop: 1471 dev->net->stats.tx_dropped++; 1472 not_drop: 1473 if (skb) 1474 dev_kfree_skb_any (skb); 1475 if (urb) { 1476 kfree(urb->sg); 1477 usb_free_urb(urb); 1478 } 1479 } else 1480 netif_dbg(dev, tx_queued, dev->net, 1481 "> tx, len %u, type 0x%x\n", length, skb->protocol); 1482 #ifdef CONFIG_PM 1483 deferred: 1484 #endif 1485 return NETDEV_TX_OK; 1486 } 1487 EXPORT_SYMBOL_GPL(usbnet_start_xmit); 1488 1489 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags) 1490 { 1491 struct urb *urb; 1492 int i; 1493 int ret = 0; 1494 1495 /* don't refill the queue all at once */ 1496 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) { 1497 urb = usb_alloc_urb(0, flags); 1498 if (urb != NULL) { 1499 ret = rx_submit(dev, urb, flags); 1500 if (ret) 1501 goto err; 1502 } else { 1503 ret = -ENOMEM; 1504 goto err; 1505 } 1506 } 1507 err: 1508 return ret; 1509 } 1510 1511 /*-------------------------------------------------------------------------*/ 1512 1513 // tasklet (work deferred from completions, in_irq) or timer 1514 1515 static void usbnet_bh (struct timer_list *t) 1516 { 1517 struct usbnet *dev = from_timer(dev, t, delay); 1518 struct sk_buff *skb; 1519 struct skb_data *entry; 1520 1521 while ((skb = skb_dequeue (&dev->done))) { 1522 entry = (struct skb_data *) skb->cb; 1523 switch (entry->state) { 1524 case rx_done: 1525 entry->state = rx_cleanup; 1526 rx_process (dev, skb); 1527 continue; 1528 case tx_done: 1529 kfree(entry->urb->sg); 1530 case rx_cleanup: 1531 usb_free_urb (entry->urb); 1532 dev_kfree_skb (skb); 1533 continue; 1534 default: 1535 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state); 1536 } 1537 } 1538 1539 /* restart RX again after disabling due to high error rate */ 1540 clear_bit(EVENT_RX_KILL, &dev->flags); 1541 1542 /* waiting for all pending urbs to complete? 1543 * only then can we forgo submitting anew 1544 */ 1545 if (waitqueue_active(&dev->wait)) { 1546 if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0) 1547 wake_up_all(&dev->wait); 1548 1549 // or are we maybe short a few urbs? 1550 } else if (netif_running (dev->net) && 1551 netif_device_present (dev->net) && 1552 netif_carrier_ok(dev->net) && 1553 !timer_pending(&dev->delay) && 1554 !test_bit(EVENT_RX_PAUSED, &dev->flags) && 1555 !test_bit(EVENT_RX_HALT, &dev->flags)) { 1556 int temp = dev->rxq.qlen; 1557 1558 if (temp < RX_QLEN(dev)) { 1559 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK) 1560 return; 1561 if (temp != dev->rxq.qlen) 1562 netif_dbg(dev, link, dev->net, 1563 "rxqlen %d --> %d\n", 1564 temp, dev->rxq.qlen); 1565 if (dev->rxq.qlen < RX_QLEN(dev)) 1566 tasklet_schedule (&dev->bh); 1567 } 1568 if (dev->txq.qlen < TX_QLEN (dev)) 1569 netif_wake_queue (dev->net); 1570 } 1571 } 1572 1573 1574 /*------------------------------------------------------------------------- 1575 * 1576 * USB Device Driver support 1577 * 1578 *-------------------------------------------------------------------------*/ 1579 1580 // precondition: never called in_interrupt 1581 1582 void usbnet_disconnect (struct usb_interface *intf) 1583 { 1584 struct usbnet *dev; 1585 struct usb_device *xdev; 1586 struct net_device *net; 1587 1588 dev = usb_get_intfdata(intf); 1589 usb_set_intfdata(intf, NULL); 1590 if (!dev) 1591 return; 1592 1593 xdev = interface_to_usbdev (intf); 1594 1595 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n", 1596 intf->dev.driver->name, 1597 xdev->bus->bus_name, xdev->devpath, 1598 dev->driver_info->description); 1599 1600 net = dev->net; 1601 unregister_netdev (net); 1602 1603 cancel_work_sync(&dev->kevent); 1604 1605 usb_scuttle_anchored_urbs(&dev->deferred); 1606 1607 if (dev->driver_info->unbind) 1608 dev->driver_info->unbind (dev, intf); 1609 1610 usb_kill_urb(dev->interrupt); 1611 usb_free_urb(dev->interrupt); 1612 kfree(dev->padding_pkt); 1613 1614 free_percpu(dev->stats64); 1615 free_netdev(net); 1616 } 1617 EXPORT_SYMBOL_GPL(usbnet_disconnect); 1618 1619 static const struct net_device_ops usbnet_netdev_ops = { 1620 .ndo_open = usbnet_open, 1621 .ndo_stop = usbnet_stop, 1622 .ndo_start_xmit = usbnet_start_xmit, 1623 .ndo_tx_timeout = usbnet_tx_timeout, 1624 .ndo_set_rx_mode = usbnet_set_rx_mode, 1625 .ndo_change_mtu = usbnet_change_mtu, 1626 .ndo_get_stats64 = usbnet_get_stats64, 1627 .ndo_set_mac_address = eth_mac_addr, 1628 .ndo_validate_addr = eth_validate_addr, 1629 }; 1630 1631 /*-------------------------------------------------------------------------*/ 1632 1633 // precondition: never called in_interrupt 1634 1635 static struct device_type wlan_type = { 1636 .name = "wlan", 1637 }; 1638 1639 static struct device_type wwan_type = { 1640 .name = "wwan", 1641 }; 1642 1643 int 1644 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) 1645 { 1646 struct usbnet *dev; 1647 struct net_device *net; 1648 struct usb_host_interface *interface; 1649 struct driver_info *info; 1650 struct usb_device *xdev; 1651 int status; 1652 const char *name; 1653 struct usb_driver *driver = to_usb_driver(udev->dev.driver); 1654 1655 /* usbnet already took usb runtime pm, so have to enable the feature 1656 * for usb interface, otherwise usb_autopm_get_interface may return 1657 * failure if RUNTIME_PM is enabled. 1658 */ 1659 if (!driver->supports_autosuspend) { 1660 driver->supports_autosuspend = 1; 1661 pm_runtime_enable(&udev->dev); 1662 } 1663 1664 name = udev->dev.driver->name; 1665 info = (struct driver_info *) prod->driver_info; 1666 if (!info) { 1667 dev_dbg (&udev->dev, "blacklisted by %s\n", name); 1668 return -ENODEV; 1669 } 1670 xdev = interface_to_usbdev (udev); 1671 interface = udev->cur_altsetting; 1672 1673 status = -ENOMEM; 1674 1675 // set up our own records 1676 net = alloc_etherdev(sizeof(*dev)); 1677 if (!net) 1678 goto out; 1679 1680 /* netdev_printk() needs this so do it as early as possible */ 1681 SET_NETDEV_DEV(net, &udev->dev); 1682 1683 dev = netdev_priv(net); 1684 dev->udev = xdev; 1685 dev->intf = udev; 1686 dev->driver_info = info; 1687 dev->driver_name = name; 1688 1689 dev->stats64 = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); 1690 if (!dev->stats64) 1691 goto out0; 1692 1693 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV 1694 | NETIF_MSG_PROBE | NETIF_MSG_LINK); 1695 init_waitqueue_head(&dev->wait); 1696 skb_queue_head_init (&dev->rxq); 1697 skb_queue_head_init (&dev->txq); 1698 skb_queue_head_init (&dev->done); 1699 skb_queue_head_init(&dev->rxq_pause); 1700 dev->bh.func = (void (*)(unsigned long))usbnet_bh; 1701 dev->bh.data = (unsigned long)&dev->delay; 1702 INIT_WORK (&dev->kevent, usbnet_deferred_kevent); 1703 init_usb_anchor(&dev->deferred); 1704 timer_setup(&dev->delay, usbnet_bh, 0); 1705 mutex_init (&dev->phy_mutex); 1706 mutex_init(&dev->interrupt_mutex); 1707 dev->interrupt_count = 0; 1708 1709 dev->net = net; 1710 strcpy (net->name, "usb%d"); 1711 memcpy (net->dev_addr, node_id, sizeof node_id); 1712 1713 /* rx and tx sides can use different message sizes; 1714 * bind() should set rx_urb_size in that case. 1715 */ 1716 dev->hard_mtu = net->mtu + net->hard_header_len; 1717 net->min_mtu = 0; 1718 net->max_mtu = ETH_MAX_MTU; 1719 1720 net->netdev_ops = &usbnet_netdev_ops; 1721 net->watchdog_timeo = TX_TIMEOUT_JIFFIES; 1722 net->ethtool_ops = &usbnet_ethtool_ops; 1723 1724 // allow device-specific bind/init procedures 1725 // NOTE net->name still not usable ... 1726 if (info->bind) { 1727 status = info->bind (dev, udev); 1728 if (status < 0) 1729 goto out1; 1730 1731 // heuristic: "usb%d" for links we know are two-host, 1732 // else "eth%d" when there's reasonable doubt. userspace 1733 // can rename the link if it knows better. 1734 if ((dev->driver_info->flags & FLAG_ETHER) != 0 && 1735 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 || 1736 (net->dev_addr [0] & 0x02) == 0)) 1737 strcpy (net->name, "eth%d"); 1738 /* WLAN devices should always be named "wlan%d" */ 1739 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1740 strcpy(net->name, "wlan%d"); 1741 /* WWAN devices should always be named "wwan%d" */ 1742 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1743 strcpy(net->name, "wwan%d"); 1744 1745 /* devices that cannot do ARP */ 1746 if ((dev->driver_info->flags & FLAG_NOARP) != 0) 1747 net->flags |= IFF_NOARP; 1748 1749 /* maybe the remote can't receive an Ethernet MTU */ 1750 if (net->mtu > (dev->hard_mtu - net->hard_header_len)) 1751 net->mtu = dev->hard_mtu - net->hard_header_len; 1752 } else if (!info->in || !info->out) 1753 status = usbnet_get_endpoints (dev, udev); 1754 else { 1755 dev->in = usb_rcvbulkpipe (xdev, info->in); 1756 dev->out = usb_sndbulkpipe (xdev, info->out); 1757 if (!(info->flags & FLAG_NO_SETINT)) 1758 status = usb_set_interface (xdev, 1759 interface->desc.bInterfaceNumber, 1760 interface->desc.bAlternateSetting); 1761 else 1762 status = 0; 1763 1764 } 1765 if (status >= 0 && dev->status) 1766 status = init_status (dev, udev); 1767 if (status < 0) 1768 goto out3; 1769 1770 if (!dev->rx_urb_size) 1771 dev->rx_urb_size = dev->hard_mtu; 1772 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1); 1773 1774 /* let userspace know we have a random address */ 1775 if (ether_addr_equal(net->dev_addr, node_id)) 1776 net->addr_assign_type = NET_ADDR_RANDOM; 1777 1778 if ((dev->driver_info->flags & FLAG_WLAN) != 0) 1779 SET_NETDEV_DEVTYPE(net, &wlan_type); 1780 if ((dev->driver_info->flags & FLAG_WWAN) != 0) 1781 SET_NETDEV_DEVTYPE(net, &wwan_type); 1782 1783 /* initialize max rx_qlen and tx_qlen */ 1784 usbnet_update_max_qlen(dev); 1785 1786 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) && 1787 !(info->flags & FLAG_MULTI_PACKET)) { 1788 dev->padding_pkt = kzalloc(1, GFP_KERNEL); 1789 if (!dev->padding_pkt) { 1790 status = -ENOMEM; 1791 goto out4; 1792 } 1793 } 1794 1795 status = register_netdev (net); 1796 if (status) 1797 goto out5; 1798 netif_info(dev, probe, dev->net, 1799 "register '%s' at usb-%s-%s, %s, %pM\n", 1800 udev->dev.driver->name, 1801 xdev->bus->bus_name, xdev->devpath, 1802 dev->driver_info->description, 1803 net->dev_addr); 1804 1805 // ok, it's ready to go. 1806 usb_set_intfdata (udev, dev); 1807 1808 netif_device_attach (net); 1809 1810 if (dev->driver_info->flags & FLAG_LINK_INTR) 1811 usbnet_link_change(dev, 0, 0); 1812 1813 return 0; 1814 1815 out5: 1816 kfree(dev->padding_pkt); 1817 out4: 1818 usb_free_urb(dev->interrupt); 1819 out3: 1820 if (info->unbind) 1821 info->unbind (dev, udev); 1822 out1: 1823 /* subdrivers must undo all they did in bind() if they 1824 * fail it, but we may fail later and a deferred kevent 1825 * may trigger an error resubmitting itself and, worse, 1826 * schedule a timer. So we kill it all just in case. 1827 */ 1828 cancel_work_sync(&dev->kevent); 1829 del_timer_sync(&dev->delay); 1830 free_percpu(dev->stats64); 1831 out0: 1832 free_netdev(net); 1833 out: 1834 return status; 1835 } 1836 EXPORT_SYMBOL_GPL(usbnet_probe); 1837 1838 /*-------------------------------------------------------------------------*/ 1839 1840 /* 1841 * suspend the whole driver as soon as the first interface is suspended 1842 * resume only when the last interface is resumed 1843 */ 1844 1845 int usbnet_suspend (struct usb_interface *intf, pm_message_t message) 1846 { 1847 struct usbnet *dev = usb_get_intfdata(intf); 1848 1849 if (!dev->suspend_count++) { 1850 spin_lock_irq(&dev->txq.lock); 1851 /* don't autosuspend while transmitting */ 1852 if (dev->txq.qlen && PMSG_IS_AUTO(message)) { 1853 dev->suspend_count--; 1854 spin_unlock_irq(&dev->txq.lock); 1855 return -EBUSY; 1856 } else { 1857 set_bit(EVENT_DEV_ASLEEP, &dev->flags); 1858 spin_unlock_irq(&dev->txq.lock); 1859 } 1860 /* 1861 * accelerate emptying of the rx and queues, to avoid 1862 * having everything error out. 1863 */ 1864 netif_device_detach (dev->net); 1865 usbnet_terminate_urbs(dev); 1866 __usbnet_status_stop_force(dev); 1867 1868 /* 1869 * reattach so runtime management can use and 1870 * wake the device 1871 */ 1872 netif_device_attach (dev->net); 1873 } 1874 return 0; 1875 } 1876 EXPORT_SYMBOL_GPL(usbnet_suspend); 1877 1878 int usbnet_resume (struct usb_interface *intf) 1879 { 1880 struct usbnet *dev = usb_get_intfdata(intf); 1881 struct sk_buff *skb; 1882 struct urb *res; 1883 int retval; 1884 1885 if (!--dev->suspend_count) { 1886 /* resume interrupt URB if it was previously submitted */ 1887 __usbnet_status_start_force(dev, GFP_NOIO); 1888 1889 spin_lock_irq(&dev->txq.lock); 1890 while ((res = usb_get_from_anchor(&dev->deferred))) { 1891 1892 skb = (struct sk_buff *)res->context; 1893 retval = usb_submit_urb(res, GFP_ATOMIC); 1894 if (retval < 0) { 1895 dev_kfree_skb_any(skb); 1896 kfree(res->sg); 1897 usb_free_urb(res); 1898 usb_autopm_put_interface_async(dev->intf); 1899 } else { 1900 netif_trans_update(dev->net); 1901 __skb_queue_tail(&dev->txq, skb); 1902 } 1903 } 1904 1905 smp_mb(); 1906 clear_bit(EVENT_DEV_ASLEEP, &dev->flags); 1907 spin_unlock_irq(&dev->txq.lock); 1908 1909 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) { 1910 /* handle remote wakeup ASAP 1911 * we cannot race against stop 1912 */ 1913 if (netif_device_present(dev->net) && 1914 !timer_pending(&dev->delay) && 1915 !test_bit(EVENT_RX_HALT, &dev->flags)) 1916 rx_alloc_submit(dev, GFP_NOIO); 1917 1918 if (!(dev->txq.qlen >= TX_QLEN(dev))) 1919 netif_tx_wake_all_queues(dev->net); 1920 tasklet_schedule (&dev->bh); 1921 } 1922 } 1923 1924 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) 1925 usb_autopm_get_interface_no_resume(intf); 1926 1927 return 0; 1928 } 1929 EXPORT_SYMBOL_GPL(usbnet_resume); 1930 1931 /* 1932 * Either a subdriver implements manage_power, then it is assumed to always 1933 * be ready to be suspended or it reports the readiness to be suspended 1934 * explicitly 1935 */ 1936 void usbnet_device_suggests_idle(struct usbnet *dev) 1937 { 1938 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) { 1939 dev->intf->needs_remote_wakeup = 1; 1940 usb_autopm_put_interface_async(dev->intf); 1941 } 1942 } 1943 EXPORT_SYMBOL(usbnet_device_suggests_idle); 1944 1945 /* 1946 * For devices that can do without special commands 1947 */ 1948 int usbnet_manage_power(struct usbnet *dev, int on) 1949 { 1950 dev->intf->needs_remote_wakeup = on; 1951 return 0; 1952 } 1953 EXPORT_SYMBOL(usbnet_manage_power); 1954 1955 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset) 1956 { 1957 /* update link after link is reseted */ 1958 if (link && !need_reset) 1959 netif_carrier_on(dev->net); 1960 else 1961 netif_carrier_off(dev->net); 1962 1963 if (need_reset && link) 1964 usbnet_defer_kevent(dev, EVENT_LINK_RESET); 1965 else 1966 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE); 1967 } 1968 EXPORT_SYMBOL(usbnet_link_change); 1969 1970 /*-------------------------------------------------------------------------*/ 1971 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 1972 u16 value, u16 index, void *data, u16 size) 1973 { 1974 void *buf = NULL; 1975 int err = -ENOMEM; 1976 1977 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x" 1978 " value=0x%04x index=0x%04x size=%d\n", 1979 cmd, reqtype, value, index, size); 1980 1981 if (size) { 1982 buf = kmalloc(size, GFP_KERNEL); 1983 if (!buf) 1984 goto out; 1985 } 1986 1987 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), 1988 cmd, reqtype, value, index, buf, size, 1989 USB_CTRL_GET_TIMEOUT); 1990 if (err > 0 && err <= size) { 1991 if (data) 1992 memcpy(data, buf, err); 1993 else 1994 netdev_dbg(dev->net, 1995 "Huh? Data requested but thrown away.\n"); 1996 } 1997 kfree(buf); 1998 out: 1999 return err; 2000 } 2001 2002 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 2003 u16 value, u16 index, const void *data, 2004 u16 size) 2005 { 2006 void *buf = NULL; 2007 int err = -ENOMEM; 2008 2009 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 2010 " value=0x%04x index=0x%04x size=%d\n", 2011 cmd, reqtype, value, index, size); 2012 2013 if (data) { 2014 buf = kmemdup(data, size, GFP_KERNEL); 2015 if (!buf) 2016 goto out; 2017 } else { 2018 if (size) { 2019 WARN_ON_ONCE(1); 2020 err = -EINVAL; 2021 goto out; 2022 } 2023 } 2024 2025 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), 2026 cmd, reqtype, value, index, buf, size, 2027 USB_CTRL_SET_TIMEOUT); 2028 kfree(buf); 2029 2030 out: 2031 return err; 2032 } 2033 2034 /* 2035 * The function can't be called inside suspend/resume callback, 2036 * otherwise deadlock will be caused. 2037 */ 2038 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 2039 u16 value, u16 index, void *data, u16 size) 2040 { 2041 int ret; 2042 2043 if (usb_autopm_get_interface(dev->intf) < 0) 2044 return -ENODEV; 2045 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index, 2046 data, size); 2047 usb_autopm_put_interface(dev->intf); 2048 return ret; 2049 } 2050 EXPORT_SYMBOL_GPL(usbnet_read_cmd); 2051 2052 /* 2053 * The function can't be called inside suspend/resume callback, 2054 * otherwise deadlock will be caused. 2055 */ 2056 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype, 2057 u16 value, u16 index, const void *data, u16 size) 2058 { 2059 int ret; 2060 2061 if (usb_autopm_get_interface(dev->intf) < 0) 2062 return -ENODEV; 2063 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index, 2064 data, size); 2065 usb_autopm_put_interface(dev->intf); 2066 return ret; 2067 } 2068 EXPORT_SYMBOL_GPL(usbnet_write_cmd); 2069 2070 /* 2071 * The function can be called inside suspend/resume callback safely 2072 * and should only be called by suspend/resume callback generally. 2073 */ 2074 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 2075 u16 value, u16 index, void *data, u16 size) 2076 { 2077 return __usbnet_read_cmd(dev, cmd, reqtype, value, index, 2078 data, size); 2079 } 2080 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm); 2081 2082 /* 2083 * The function can be called inside suspend/resume callback safely 2084 * and should only be called by suspend/resume callback generally. 2085 */ 2086 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype, 2087 u16 value, u16 index, const void *data, 2088 u16 size) 2089 { 2090 return __usbnet_write_cmd(dev, cmd, reqtype, value, index, 2091 data, size); 2092 } 2093 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm); 2094 2095 static void usbnet_async_cmd_cb(struct urb *urb) 2096 { 2097 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context; 2098 int status = urb->status; 2099 2100 if (status < 0) 2101 dev_dbg(&urb->dev->dev, "%s failed with %d", 2102 __func__, status); 2103 2104 kfree(req); 2105 usb_free_urb(urb); 2106 } 2107 2108 /* 2109 * The caller must make sure that device can't be put into suspend 2110 * state until the control URB completes. 2111 */ 2112 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype, 2113 u16 value, u16 index, const void *data, u16 size) 2114 { 2115 struct usb_ctrlrequest *req = NULL; 2116 struct urb *urb; 2117 int err = -ENOMEM; 2118 void *buf = NULL; 2119 2120 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x" 2121 " value=0x%04x index=0x%04x size=%d\n", 2122 cmd, reqtype, value, index, size); 2123 2124 urb = usb_alloc_urb(0, GFP_ATOMIC); 2125 if (!urb) 2126 goto fail; 2127 2128 if (data) { 2129 buf = kmemdup(data, size, GFP_ATOMIC); 2130 if (!buf) { 2131 netdev_err(dev->net, "Error allocating buffer" 2132 " in %s!\n", __func__); 2133 goto fail_free; 2134 } 2135 } 2136 2137 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC); 2138 if (!req) 2139 goto fail_free_buf; 2140 2141 req->bRequestType = reqtype; 2142 req->bRequest = cmd; 2143 req->wValue = cpu_to_le16(value); 2144 req->wIndex = cpu_to_le16(index); 2145 req->wLength = cpu_to_le16(size); 2146 2147 usb_fill_control_urb(urb, dev->udev, 2148 usb_sndctrlpipe(dev->udev, 0), 2149 (void *)req, buf, size, 2150 usbnet_async_cmd_cb, req); 2151 urb->transfer_flags |= URB_FREE_BUFFER; 2152 2153 err = usb_submit_urb(urb, GFP_ATOMIC); 2154 if (err < 0) { 2155 netdev_err(dev->net, "Error submitting the control" 2156 " message: status=%d\n", err); 2157 goto fail_free; 2158 } 2159 return 0; 2160 2161 fail_free_buf: 2162 kfree(buf); 2163 fail_free: 2164 kfree(req); 2165 usb_free_urb(urb); 2166 fail: 2167 return err; 2168 2169 } 2170 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async); 2171 /*-------------------------------------------------------------------------*/ 2172 2173 static int __init usbnet_init(void) 2174 { 2175 /* Compiler should optimize this out. */ 2176 BUILD_BUG_ON( 2177 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data)); 2178 2179 eth_random_addr(node_id); 2180 return 0; 2181 } 2182 module_init(usbnet_init); 2183 2184 static void __exit usbnet_exit(void) 2185 { 2186 } 2187 module_exit(usbnet_exit); 2188 2189 MODULE_AUTHOR("David Brownell"); 2190 MODULE_DESCRIPTION("USB network driver framework"); 2191 MODULE_LICENSE("GPL"); 2192