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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * USB Network driver infrastructure4 * Copyright (C) 2000-2005 by David Brownell5 * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>6 */7 8/*9 * This is a generic "USB networking" framework that works with several10 * kinds of full and high speed networking devices: host-to-host cables,11 * smart usb peripherals, and actual Ethernet adapters.12 *13 * These devices usually differ in terms of control protocols (if they14 * even have one!) and sometimes they define new framing to wrap or batch15 * Ethernet packets. Otherwise, they talk to USB pretty much the same,16 * so interface (un)binding, endpoint I/O queues, fault handling, and other17 * issues can usefully be addressed by this framework.18 */19 20#include <linux/module.h>21#include <linux/init.h>22#include <linux/netdevice.h>23#include <linux/etherdevice.h>24#include <linux/ctype.h>25#include <linux/ethtool.h>26#include <linux/workqueue.h>27#include <linux/mii.h>28#include <linux/usb.h>29#include <linux/usb/usbnet.h>30#include <linux/slab.h>31#include <linux/kernel.h>32#include <linux/pm_runtime.h>33 34/*-------------------------------------------------------------------------*/35 36/*37 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max.38 * Several dozen bytes of IPv4 data can fit in two such transactions.39 * One maximum size Ethernet packet takes twenty four of them.40 * For high speed, each frame comfortably fits almost 36 max size41 * Ethernet packets (so queues should be bigger).42 *43 * The goal is to let the USB host controller be busy for 5msec or44 * more before an irq is required, under load. Jumbograms change45 * the equation.46 */47#define MAX_QUEUE_MEMORY (60 * 1518)48#define RX_QLEN(dev) ((dev)->rx_qlen)49#define TX_QLEN(dev) ((dev)->tx_qlen)50 51// reawaken network queue this soon after stopping; else watchdog barks52#define TX_TIMEOUT_JIFFIES (5*HZ)53 54/* throttle rx/tx briefly after some faults, so hub_wq might disconnect()55 * us (it polls at HZ/4 usually) before we report too many false errors.56 */57#define THROTTLE_JIFFIES (HZ/8)58 59// between wakeups60#define UNLINK_TIMEOUT_MS 361 62/*-------------------------------------------------------------------------*/63 64/* use ethtool to change the level for any given device */65static int msg_level = -1;66module_param (msg_level, int, 0);67MODULE_PARM_DESC (msg_level, "Override default message level");68 69/*-------------------------------------------------------------------------*/70 71static const char * const usbnet_event_names[] = {72 [EVENT_TX_HALT] = "EVENT_TX_HALT",73 [EVENT_RX_HALT] = "EVENT_RX_HALT",74 [EVENT_RX_MEMORY] = "EVENT_RX_MEMORY",75 [EVENT_STS_SPLIT] = "EVENT_STS_SPLIT",76 [EVENT_LINK_RESET] = "EVENT_LINK_RESET",77 [EVENT_RX_PAUSED] = "EVENT_RX_PAUSED",78 [EVENT_DEV_ASLEEP] = "EVENT_DEV_ASLEEP",79 [EVENT_DEV_OPEN] = "EVENT_DEV_OPEN",80 [EVENT_DEVICE_REPORT_IDLE] = "EVENT_DEVICE_REPORT_IDLE",81 [EVENT_NO_RUNTIME_PM] = "EVENT_NO_RUNTIME_PM",82 [EVENT_RX_KILL] = "EVENT_RX_KILL",83 [EVENT_LINK_CHANGE] = "EVENT_LINK_CHANGE",84 [EVENT_SET_RX_MODE] = "EVENT_SET_RX_MODE",85 [EVENT_NO_IP_ALIGN] = "EVENT_NO_IP_ALIGN",86};87 88/* handles CDC Ethernet and many other network "bulk data" interfaces */89int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)90{91 int tmp;92 struct usb_host_interface *alt = NULL;93 struct usb_host_endpoint *in = NULL, *out = NULL;94 struct usb_host_endpoint *status = NULL;95 96 for (tmp = 0; tmp < intf->num_altsetting; tmp++) {97 unsigned ep;98 99 in = out = status = NULL;100 alt = intf->altsetting + tmp;101 102 /* take the first altsetting with in-bulk + out-bulk;103 * remember any status endpoint, just in case;104 * ignore other endpoints and altsettings.105 */106 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {107 struct usb_host_endpoint *e;108 int intr = 0;109 110 e = alt->endpoint + ep;111 112 /* ignore endpoints which cannot transfer data */113 if (!usb_endpoint_maxp(&e->desc))114 continue;115 116 switch (e->desc.bmAttributes) {117 case USB_ENDPOINT_XFER_INT:118 if (!usb_endpoint_dir_in(&e->desc))119 continue;120 intr = 1;121 fallthrough;122 case USB_ENDPOINT_XFER_BULK:123 break;124 default:125 continue;126 }127 if (usb_endpoint_dir_in(&e->desc)) {128 if (!intr && !in)129 in = e;130 else if (intr && !status)131 status = e;132 } else {133 if (!out)134 out = e;135 }136 }137 if (in && out)138 break;139 }140 if (!alt || !in || !out)141 return -EINVAL;142 143 if (alt->desc.bAlternateSetting != 0 ||144 !(dev->driver_info->flags & FLAG_NO_SETINT)) {145 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber,146 alt->desc.bAlternateSetting);147 if (tmp < 0)148 return tmp;149 }150 151 dev->in = usb_rcvbulkpipe (dev->udev,152 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);153 dev->out = usb_sndbulkpipe (dev->udev,154 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);155 dev->status = status;156 return 0;157}158EXPORT_SYMBOL_GPL(usbnet_get_endpoints);159 160int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress)161{162 u8 addr[ETH_ALEN];163 int tmp = -1, ret;164 unsigned char buf [13];165 166 ret = usb_string(dev->udev, iMACAddress, buf, sizeof buf);167 if (ret == 12)168 tmp = hex2bin(addr, buf, 6);169 if (tmp < 0) {170 dev_dbg(&dev->udev->dev,171 "bad MAC string %d fetch, %d\n", iMACAddress, tmp);172 if (ret >= 0)173 ret = -EINVAL;174 return ret;175 }176 eth_hw_addr_set(dev->net, addr);177 return 0;178}179EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr);180 181static void intr_complete (struct urb *urb)182{183 struct usbnet *dev = urb->context;184 int status = urb->status;185 186 switch (status) {187 /* success */188 case 0:189 dev->driver_info->status(dev, urb);190 break;191 192 /* software-driven interface shutdown */193 case -ENOENT: /* urb killed */194 case -ESHUTDOWN: /* hardware gone */195 netif_dbg(dev, ifdown, dev->net,196 "intr shutdown, code %d\n", status);197 return;198 199 /* NOTE: not throttling like RX/TX, since this endpoint200 * already polls infrequently201 */202 default:203 netdev_dbg(dev->net, "intr status %d\n", status);204 break;205 }206 207 status = usb_submit_urb (urb, GFP_ATOMIC);208 if (status != 0)209 netif_err(dev, timer, dev->net,210 "intr resubmit --> %d\n", status);211}212 213static int init_status (struct usbnet *dev, struct usb_interface *intf)214{215 char *buf = NULL;216 unsigned pipe = 0;217 unsigned maxp;218 unsigned period;219 220 if (!dev->driver_info->status)221 return 0;222 223 pipe = usb_rcvintpipe (dev->udev,224 dev->status->desc.bEndpointAddress225 & USB_ENDPOINT_NUMBER_MASK);226 maxp = usb_maxpacket(dev->udev, pipe);227 228 /* avoid 1 msec chatter: min 8 msec poll rate */229 period = max ((int) dev->status->desc.bInterval,230 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3);231 232 buf = kmalloc (maxp, GFP_KERNEL);233 if (buf) {234 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL);235 if (!dev->interrupt) {236 kfree (buf);237 return -ENOMEM;238 } else {239 usb_fill_int_urb(dev->interrupt, dev->udev, pipe,240 buf, maxp, intr_complete, dev, period);241 dev->interrupt->transfer_flags |= URB_FREE_BUFFER;242 dev_dbg(&intf->dev,243 "status ep%din, %d bytes period %d\n",244 usb_pipeendpoint(pipe), maxp, period);245 }246 }247 return 0;248}249 250/* Submit the interrupt URB if not previously submitted, increasing refcount */251int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags)252{253 int ret = 0;254 255 WARN_ON_ONCE(dev->interrupt == NULL);256 if (dev->interrupt) {257 mutex_lock(&dev->interrupt_mutex);258 259 if (++dev->interrupt_count == 1)260 ret = usb_submit_urb(dev->interrupt, mem_flags);261 262 dev_dbg(&dev->udev->dev, "incremented interrupt URB count to %d\n",263 dev->interrupt_count);264 mutex_unlock(&dev->interrupt_mutex);265 }266 return ret;267}268EXPORT_SYMBOL_GPL(usbnet_status_start);269 270/* For resume; submit interrupt URB if previously submitted */271static int __usbnet_status_start_force(struct usbnet *dev, gfp_t mem_flags)272{273 int ret = 0;274 275 mutex_lock(&dev->interrupt_mutex);276 if (dev->interrupt_count) {277 ret = usb_submit_urb(dev->interrupt, mem_flags);278 dev_dbg(&dev->udev->dev,279 "submitted interrupt URB for resume\n");280 }281 mutex_unlock(&dev->interrupt_mutex);282 return ret;283}284 285/* Kill the interrupt URB if all submitters want it killed */286void usbnet_status_stop(struct usbnet *dev)287{288 if (dev->interrupt) {289 mutex_lock(&dev->interrupt_mutex);290 WARN_ON(dev->interrupt_count == 0);291 292 if (dev->interrupt_count && --dev->interrupt_count == 0)293 usb_kill_urb(dev->interrupt);294 295 dev_dbg(&dev->udev->dev,296 "decremented interrupt URB count to %d\n",297 dev->interrupt_count);298 mutex_unlock(&dev->interrupt_mutex);299 }300}301EXPORT_SYMBOL_GPL(usbnet_status_stop);302 303/* For suspend; always kill interrupt URB */304static void __usbnet_status_stop_force(struct usbnet *dev)305{306 if (dev->interrupt) {307 mutex_lock(&dev->interrupt_mutex);308 usb_kill_urb(dev->interrupt);309 dev_dbg(&dev->udev->dev, "killed interrupt URB for suspend\n");310 mutex_unlock(&dev->interrupt_mutex);311 }312}313 314/* Passes this packet up the stack, updating its accounting.315 * Some link protocols batch packets, so their rx_fixup paths316 * can return clones as well as just modify the original skb.317 */318void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)319{320 struct pcpu_sw_netstats *stats64 = this_cpu_ptr(dev->net->tstats);321 unsigned long flags;322 int status;323 324 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) {325 skb_queue_tail(&dev->rxq_pause, skb);326 return;327 }328 329 /* only update if unset to allow minidriver rx_fixup override */330 if (skb->protocol == 0)331 skb->protocol = eth_type_trans (skb, dev->net);332 333 flags = u64_stats_update_begin_irqsave(&stats64->syncp);334 u64_stats_inc(&stats64->rx_packets);335 u64_stats_add(&stats64->rx_bytes, skb->len);336 u64_stats_update_end_irqrestore(&stats64->syncp, flags);337 338 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n",339 skb->len + sizeof (struct ethhdr), skb->protocol);340 memset (skb->cb, 0, sizeof (struct skb_data));341 342 if (skb_defer_rx_timestamp(skb))343 return;344 345 status = netif_rx (skb);346 if (status != NET_RX_SUCCESS)347 netif_dbg(dev, rx_err, dev->net,348 "netif_rx status %d\n", status);349}350EXPORT_SYMBOL_GPL(usbnet_skb_return);351 352/* must be called if hard_mtu or rx_urb_size changed */353void usbnet_update_max_qlen(struct usbnet *dev)354{355 enum usb_device_speed speed = dev->udev->speed;356 357 if (!dev->rx_urb_size || !dev->hard_mtu)358 goto insanity;359 switch (speed) {360 case USB_SPEED_HIGH:361 dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size;362 dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu;363 break;364 case USB_SPEED_SUPER:365 case USB_SPEED_SUPER_PLUS:366 /*367 * Not take default 5ms qlen for super speed HC to368 * save memory, and iperf tests show 2.5ms qlen can369 * work well370 */371 dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size;372 dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu;373 break;374 default:375insanity:376 dev->rx_qlen = dev->tx_qlen = 4;377 }378}379EXPORT_SYMBOL_GPL(usbnet_update_max_qlen);380 381 382/*-------------------------------------------------------------------------383 *384 * Network Device Driver (peer link to "Host Device", from USB host)385 *386 *-------------------------------------------------------------------------*/387 388int usbnet_change_mtu (struct net_device *net, int new_mtu)389{390 struct usbnet *dev = netdev_priv(net);391 int ll_mtu = new_mtu + net->hard_header_len;392 int old_hard_mtu = dev->hard_mtu;393 int old_rx_urb_size = dev->rx_urb_size;394 395 // no second zero-length packet read wanted after mtu-sized packets396 if ((ll_mtu % dev->maxpacket) == 0)397 return -EDOM;398 WRITE_ONCE(net->mtu, new_mtu);399 400 dev->hard_mtu = net->mtu + net->hard_header_len;401 if (dev->rx_urb_size == old_hard_mtu) {402 dev->rx_urb_size = dev->hard_mtu;403 if (dev->rx_urb_size > old_rx_urb_size) {404 usbnet_pause_rx(dev);405 usbnet_unlink_rx_urbs(dev);406 usbnet_resume_rx(dev);407 }408 }409 410 /* max qlen depend on hard_mtu and rx_urb_size */411 usbnet_update_max_qlen(dev);412 413 return 0;414}415EXPORT_SYMBOL_GPL(usbnet_change_mtu);416 417/* The caller must hold list->lock */418static void __usbnet_queue_skb(struct sk_buff_head *list,419 struct sk_buff *newsk, enum skb_state state)420{421 struct skb_data *entry = (struct skb_data *) newsk->cb;422 423 __skb_queue_tail(list, newsk);424 entry->state = state;425}426 427/*-------------------------------------------------------------------------*/428 429/* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from430 * completion callbacks. 2.5 should have fixed those bugs...431 */432 433static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb,434 struct sk_buff_head *list, enum skb_state state)435{436 unsigned long flags;437 enum skb_state old_state;438 struct skb_data *entry = (struct skb_data *) skb->cb;439 440 spin_lock_irqsave(&list->lock, flags);441 old_state = entry->state;442 entry->state = state;443 __skb_unlink(skb, list);444 445 /* defer_bh() is never called with list == &dev->done.446 * spin_lock_nested() tells lockdep that it is OK to take447 * dev->done.lock here with list->lock held.448 */449 spin_lock_nested(&dev->done.lock, SINGLE_DEPTH_NESTING);450 451 __skb_queue_tail(&dev->done, skb);452 if (dev->done.qlen == 1)453 tasklet_schedule(&dev->bh);454 spin_unlock(&dev->done.lock);455 spin_unlock_irqrestore(&list->lock, flags);456 return old_state;457}458 459/* some work can't be done in tasklets, so we use keventd460 *461 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,462 * but tasklet_schedule() doesn't. hope the failure is rare.463 */464void usbnet_defer_kevent (struct usbnet *dev, int work)465{466 set_bit (work, &dev->flags);467 if (!usbnet_going_away(dev)) {468 if (!schedule_work(&dev->kevent))469 netdev_dbg(dev->net,470 "kevent %s may have been dropped\n",471 usbnet_event_names[work]);472 else473 netdev_dbg(dev->net,474 "kevent %s scheduled\n", usbnet_event_names[work]);475 }476}477EXPORT_SYMBOL_GPL(usbnet_defer_kevent);478 479/*-------------------------------------------------------------------------*/480 481static void rx_complete (struct urb *urb);482 483static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)484{485 struct sk_buff *skb;486 struct skb_data *entry;487 int retval = 0;488 unsigned long lockflags;489 size_t size = dev->rx_urb_size;490 491 /* prevent rx skb allocation when error ratio is high */492 if (test_bit(EVENT_RX_KILL, &dev->flags)) {493 usb_free_urb(urb);494 return -ENOLINK;495 }496 497 if (test_bit(EVENT_NO_IP_ALIGN, &dev->flags))498 skb = __netdev_alloc_skb(dev->net, size, flags);499 else500 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);501 if (!skb) {502 netif_dbg(dev, rx_err, dev->net, "no rx skb\n");503 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);504 usb_free_urb (urb);505 return -ENOMEM;506 }507 508 entry = (struct skb_data *) skb->cb;509 entry->urb = urb;510 entry->dev = dev;511 entry->length = 0;512 513 usb_fill_bulk_urb (urb, dev->udev, dev->in,514 skb->data, size, rx_complete, skb);515 516 spin_lock_irqsave (&dev->rxq.lock, lockflags);517 518 if (netif_running (dev->net) &&519 netif_device_present (dev->net) &&520 test_bit(EVENT_DEV_OPEN, &dev->flags) &&521 !test_bit (EVENT_RX_HALT, &dev->flags) &&522 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {523 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {524 case -EPIPE:525 usbnet_defer_kevent (dev, EVENT_RX_HALT);526 break;527 case -ENOMEM:528 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);529 break;530 case -ENODEV:531 netif_dbg(dev, ifdown, dev->net, "device gone\n");532 netif_device_detach (dev->net);533 break;534 case -EHOSTUNREACH:535 retval = -ENOLINK;536 break;537 default:538 netif_dbg(dev, rx_err, dev->net,539 "rx submit, %d\n", retval);540 tasklet_schedule (&dev->bh);541 break;542 case 0:543 if (!usbnet_going_away(dev))544 __usbnet_queue_skb(&dev->rxq, skb, rx_start);545 }546 } else {547 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");548 retval = -ENOLINK;549 }550 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);551 if (retval) {552 dev_kfree_skb_any (skb);553 usb_free_urb (urb);554 }555 return retval;556}557 558 559/*-------------------------------------------------------------------------*/560 561static inline int rx_process(struct usbnet *dev, struct sk_buff *skb)562{563 if (dev->driver_info->rx_fixup &&564 !dev->driver_info->rx_fixup (dev, skb)) {565 /* With RX_ASSEMBLE, rx_fixup() must update counters */566 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE))567 dev->net->stats.rx_errors++;568 return -EPROTO;569 }570 // else network stack removes extra byte if we forced a short packet571 572 /* all data was already cloned from skb inside the driver */573 if (dev->driver_info->flags & FLAG_MULTI_PACKET)574 return -EALREADY;575 576 if (skb->len < ETH_HLEN) {577 dev->net->stats.rx_errors++;578 dev->net->stats.rx_length_errors++;579 netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len);580 return -EPROTO;581 }582 583 usbnet_skb_return(dev, skb);584 return 0;585}586 587/*-------------------------------------------------------------------------*/588 589static void rx_complete (struct urb *urb)590{591 struct sk_buff *skb = (struct sk_buff *) urb->context;592 struct skb_data *entry = (struct skb_data *) skb->cb;593 struct usbnet *dev = entry->dev;594 int urb_status = urb->status;595 enum skb_state state;596 597 skb_put (skb, urb->actual_length);598 state = rx_done;599 entry->urb = NULL;600 601 switch (urb_status) {602 /* success */603 case 0:604 break;605 606 /* stalls need manual reset. this is rare ... except that607 * when going through USB 2.0 TTs, unplug appears this way.608 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ609 * storm, recovering as needed.610 */611 case -EPIPE:612 dev->net->stats.rx_errors++;613 usbnet_defer_kevent (dev, EVENT_RX_HALT);614 fallthrough;615 616 /* software-driven interface shutdown */617 case -ECONNRESET: /* async unlink */618 case -ESHUTDOWN: /* hardware gone */619 netif_dbg(dev, ifdown, dev->net,620 "rx shutdown, code %d\n", urb_status);621 goto block;622 623 /* we get controller i/o faults during hub_wq disconnect() delays.624 * throttle down resubmits, to avoid log floods; just temporarily,625 * so we still recover when the fault isn't a hub_wq delay.626 */627 case -EPROTO:628 case -ETIME:629 case -EILSEQ:630 dev->net->stats.rx_errors++;631 if (!timer_pending (&dev->delay)) {632 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);633 netif_dbg(dev, link, dev->net,634 "rx throttle %d\n", urb_status);635 }636block:637 state = rx_cleanup;638 entry->urb = urb;639 urb = NULL;640 break;641 642 /* data overrun ... flush fifo? */643 case -EOVERFLOW:644 dev->net->stats.rx_over_errors++;645 fallthrough;646 647 default:648 state = rx_cleanup;649 dev->net->stats.rx_errors++;650 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);651 break;652 }653 654 /* stop rx if packet error rate is high */655 if (++dev->pkt_cnt > 30) {656 dev->pkt_cnt = 0;657 dev->pkt_err = 0;658 } else {659 if (state == rx_cleanup)660 dev->pkt_err++;661 if (dev->pkt_err > 20)662 set_bit(EVENT_RX_KILL, &dev->flags);663 }664 665 state = defer_bh(dev, skb, &dev->rxq, state);666 667 if (urb) {668 if (netif_running (dev->net) &&669 !test_bit (EVENT_RX_HALT, &dev->flags) &&670 state != unlink_start) {671 rx_submit (dev, urb, GFP_ATOMIC);672 usb_mark_last_busy(dev->udev);673 return;674 }675 usb_free_urb (urb);676 }677 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");678}679 680/*-------------------------------------------------------------------------*/681void usbnet_pause_rx(struct usbnet *dev)682{683 set_bit(EVENT_RX_PAUSED, &dev->flags);684 685 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");686}687EXPORT_SYMBOL_GPL(usbnet_pause_rx);688 689void usbnet_resume_rx(struct usbnet *dev)690{691 struct sk_buff *skb;692 int num = 0;693 694 clear_bit(EVENT_RX_PAUSED, &dev->flags);695 696 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {697 usbnet_skb_return(dev, skb);698 num++;699 }700 701 tasklet_schedule(&dev->bh);702 703 netif_dbg(dev, rx_status, dev->net,704 "paused rx queue disabled, %d skbs requeued\n", num);705}706EXPORT_SYMBOL_GPL(usbnet_resume_rx);707 708void usbnet_purge_paused_rxq(struct usbnet *dev)709{710 skb_queue_purge(&dev->rxq_pause);711}712EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);713 714/*-------------------------------------------------------------------------*/715 716// unlink pending rx/tx; completion handlers do all other cleanup717 718static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)719{720 unsigned long flags;721 struct sk_buff *skb;722 int count = 0;723 724 spin_lock_irqsave (&q->lock, flags);725 while (!skb_queue_empty(q)) {726 struct skb_data *entry;727 struct urb *urb;728 int retval;729 730 skb_queue_walk(q, skb) {731 entry = (struct skb_data *) skb->cb;732 if (entry->state != unlink_start)733 goto found;734 }735 break;736found:737 entry->state = unlink_start;738 urb = entry->urb;739 740 /*741 * Get reference count of the URB to avoid it to be742 * freed during usb_unlink_urb, which may trigger743 * use-after-free problem inside usb_unlink_urb since744 * usb_unlink_urb is always racing with .complete745 * handler(include defer_bh).746 */747 usb_get_urb(urb);748 spin_unlock_irqrestore(&q->lock, flags);749 // during some PM-driven resume scenarios,750 // these (async) unlinks complete immediately751 retval = usb_unlink_urb (urb);752 if (retval != -EINPROGRESS && retval != 0)753 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);754 else755 count++;756 usb_put_urb(urb);757 spin_lock_irqsave(&q->lock, flags);758 }759 spin_unlock_irqrestore (&q->lock, flags);760 return count;761}762 763// Flush all pending rx urbs764// minidrivers may need to do this when the MTU changes765 766void usbnet_unlink_rx_urbs(struct usbnet *dev)767{768 if (netif_running(dev->net)) {769 (void) unlink_urbs (dev, &dev->rxq);770 tasklet_schedule(&dev->bh);771 }772}773EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);774 775/*-------------------------------------------------------------------------*/776 777static void wait_skb_queue_empty(struct sk_buff_head *q)778{779 unsigned long flags;780 781 spin_lock_irqsave(&q->lock, flags);782 while (!skb_queue_empty(q)) {783 spin_unlock_irqrestore(&q->lock, flags);784 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));785 set_current_state(TASK_UNINTERRUPTIBLE);786 spin_lock_irqsave(&q->lock, flags);787 }788 spin_unlock_irqrestore(&q->lock, flags);789}790 791// precondition: never called in_interrupt792static void usbnet_terminate_urbs(struct usbnet *dev)793{794 DECLARE_WAITQUEUE(wait, current);795 int temp;796 797 /* ensure there are no more active urbs */798 add_wait_queue(&dev->wait, &wait);799 set_current_state(TASK_UNINTERRUPTIBLE);800 temp = unlink_urbs(dev, &dev->txq) +801 unlink_urbs(dev, &dev->rxq);802 803 /* maybe wait for deletions to finish. */804 wait_skb_queue_empty(&dev->rxq);805 wait_skb_queue_empty(&dev->txq);806 wait_skb_queue_empty(&dev->done);807 netif_dbg(dev, ifdown, dev->net,808 "waited for %d urb completions\n", temp);809 set_current_state(TASK_RUNNING);810 remove_wait_queue(&dev->wait, &wait);811}812 813int usbnet_stop (struct net_device *net)814{815 struct usbnet *dev = netdev_priv(net);816 const struct driver_info *info = dev->driver_info;817 int retval, pm, mpn;818 819 clear_bit(EVENT_DEV_OPEN, &dev->flags);820 netif_stop_queue (net);821 822 netif_info(dev, ifdown, dev->net,823 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",824 net->stats.rx_packets, net->stats.tx_packets,825 net->stats.rx_errors, net->stats.tx_errors);826 827 /* to not race resume */828 pm = usb_autopm_get_interface(dev->intf);829 /* allow minidriver to stop correctly (wireless devices to turn off830 * radio etc) */831 if (info->stop) {832 retval = info->stop(dev);833 if (retval < 0)834 netif_info(dev, ifdown, dev->net,835 "stop fail (%d) usbnet usb-%s-%s, %s\n",836 retval,837 dev->udev->bus->bus_name, dev->udev->devpath,838 info->description);839 }840 841 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))842 usbnet_terminate_urbs(dev);843 844 usbnet_status_stop(dev);845 846 usbnet_purge_paused_rxq(dev);847 848 mpn = !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags);849 850 /* deferred work (timer, softirq, task) must also stop */851 dev->flags = 0;852 del_timer_sync(&dev->delay);853 tasklet_kill(&dev->bh);854 cancel_work_sync(&dev->kevent);855 856 /* We have cyclic dependencies. Those calls are needed857 * to break a cycle. We cannot fall into the gaps because858 * we have a flag859 */860 tasklet_kill(&dev->bh);861 del_timer_sync(&dev->delay);862 cancel_work_sync(&dev->kevent);863 864 if (!pm)865 usb_autopm_put_interface(dev->intf);866 867 if (info->manage_power && mpn)868 info->manage_power(dev, 0);869 else870 usb_autopm_put_interface(dev->intf);871 872 return 0;873}874EXPORT_SYMBOL_GPL(usbnet_stop);875 876/*-------------------------------------------------------------------------*/877 878// posts reads, and enables write queuing879 880// precondition: never called in_interrupt881 882int usbnet_open (struct net_device *net)883{884 struct usbnet *dev = netdev_priv(net);885 int retval;886 const struct driver_info *info = dev->driver_info;887 888 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {889 netif_info(dev, ifup, dev->net,890 "resumption fail (%d) usbnet usb-%s-%s, %s\n",891 retval,892 dev->udev->bus->bus_name,893 dev->udev->devpath,894 info->description);895 goto done_nopm;896 }897 898 // put into "known safe" state899 if (info->reset && (retval = info->reset (dev)) < 0) {900 netif_info(dev, ifup, dev->net,901 "open reset fail (%d) usbnet usb-%s-%s, %s\n",902 retval,903 dev->udev->bus->bus_name,904 dev->udev->devpath,905 info->description);906 goto done;907 }908 909 /* hard_mtu or rx_urb_size may change in reset() */910 usbnet_update_max_qlen(dev);911 912 // insist peer be connected913 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {914 netif_err(dev, ifup, dev->net, "can't open; %d\n", retval);915 goto done;916 }917 918 /* start any status interrupt transfer */919 if (dev->interrupt) {920 retval = usbnet_status_start(dev, GFP_KERNEL);921 if (retval < 0) {922 netif_err(dev, ifup, dev->net,923 "intr submit %d\n", retval);924 goto done;925 }926 }927 928 set_bit(EVENT_DEV_OPEN, &dev->flags);929 netif_start_queue (net);930 netif_info(dev, ifup, dev->net,931 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",932 (int)RX_QLEN(dev), (int)TX_QLEN(dev),933 dev->net->mtu,934 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :935 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :936 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :937 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :938 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :939 "simple");940 941 /* reset rx error state */942 dev->pkt_cnt = 0;943 dev->pkt_err = 0;944 clear_bit(EVENT_RX_KILL, &dev->flags);945 946 // delay posting reads until we're fully open947 tasklet_schedule (&dev->bh);948 if (info->manage_power) {949 retval = info->manage_power(dev, 1);950 if (retval < 0) {951 retval = 0;952 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags);953 } else {954 usb_autopm_put_interface(dev->intf);955 }956 }957 return retval;958done:959 usb_autopm_put_interface(dev->intf);960done_nopm:961 return retval;962}963EXPORT_SYMBOL_GPL(usbnet_open);964 965/*-------------------------------------------------------------------------*/966 967/* ethtool methods; minidrivers may need to add some more, but968 * they'll probably want to use this base set.969 */970 971/* These methods are written on the assumption that the device972 * uses MII973 */974int usbnet_get_link_ksettings_mii(struct net_device *net,975 struct ethtool_link_ksettings *cmd)976{977 struct usbnet *dev = netdev_priv(net);978 979 if (!dev->mii.mdio_read)980 return -EOPNOTSUPP;981 982 mii_ethtool_get_link_ksettings(&dev->mii, cmd);983 984 return 0;985}986EXPORT_SYMBOL_GPL(usbnet_get_link_ksettings_mii);987 988int usbnet_get_link_ksettings_internal(struct net_device *net,989 struct ethtool_link_ksettings *cmd)990{991 struct usbnet *dev = netdev_priv(net);992 993 /* the assumption that speed is equal on tx and rx994 * is deeply engrained into the networking layer.995 * For wireless stuff it is not true.996 * We assume that rx_speed matters more.997 */998 if (dev->rx_speed != SPEED_UNSET)999 cmd->base.speed = dev->rx_speed / 1000000;1000 else if (dev->tx_speed != SPEED_UNSET)1001 cmd->base.speed = dev->tx_speed / 1000000;1002 else1003 cmd->base.speed = SPEED_UNKNOWN;1004 1005 return 0;1006}1007EXPORT_SYMBOL_GPL(usbnet_get_link_ksettings_internal);1008 1009int usbnet_set_link_ksettings_mii(struct net_device *net,1010 const struct ethtool_link_ksettings *cmd)1011{1012 struct usbnet *dev = netdev_priv(net);1013 int retval;1014 1015 if (!dev->mii.mdio_write)1016 return -EOPNOTSUPP;1017 1018 retval = mii_ethtool_set_link_ksettings(&dev->mii, cmd);1019 1020 /* link speed/duplex might have changed */1021 if (dev->driver_info->link_reset)1022 dev->driver_info->link_reset(dev);1023 1024 /* hard_mtu or rx_urb_size may change in link_reset() */1025 usbnet_update_max_qlen(dev);1026 1027 return retval;1028}1029EXPORT_SYMBOL_GPL(usbnet_set_link_ksettings_mii);1030 1031u32 usbnet_get_link (struct net_device *net)1032{1033 struct usbnet *dev = netdev_priv(net);1034 1035 /* If a check_connect is defined, return its result */1036 if (dev->driver_info->check_connect)1037 return dev->driver_info->check_connect (dev) == 0;1038 1039 /* if the device has mii operations, use those */1040 if (dev->mii.mdio_read)1041 return mii_link_ok(&dev->mii);1042 1043 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */1044 return ethtool_op_get_link(net);1045}1046EXPORT_SYMBOL_GPL(usbnet_get_link);1047 1048int usbnet_nway_reset(struct net_device *net)1049{1050 struct usbnet *dev = netdev_priv(net);1051 1052 if (!dev->mii.mdio_write)1053 return -EOPNOTSUPP;1054 1055 return mii_nway_restart(&dev->mii);1056}1057EXPORT_SYMBOL_GPL(usbnet_nway_reset);1058 1059void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)1060{1061 struct usbnet *dev = netdev_priv(net);1062 1063 strscpy(info->driver, dev->driver_name, sizeof(info->driver));1064 strscpy(info->fw_version, dev->driver_info->description,1065 sizeof(info->fw_version));1066 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);1067}1068EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);1069 1070u32 usbnet_get_msglevel (struct net_device *net)1071{1072 struct usbnet *dev = netdev_priv(net);1073 1074 return dev->msg_enable;1075}1076EXPORT_SYMBOL_GPL(usbnet_get_msglevel);1077 1078void usbnet_set_msglevel (struct net_device *net, u32 level)1079{1080 struct usbnet *dev = netdev_priv(net);1081 1082 dev->msg_enable = level;1083}1084EXPORT_SYMBOL_GPL(usbnet_set_msglevel);1085 1086/* drivers may override default ethtool_ops in their bind() routine */1087static const struct ethtool_ops usbnet_ethtool_ops = {1088 .get_link = usbnet_get_link,1089 .nway_reset = usbnet_nway_reset,1090 .get_drvinfo = usbnet_get_drvinfo,1091 .get_msglevel = usbnet_get_msglevel,1092 .set_msglevel = usbnet_set_msglevel,1093 .get_ts_info = ethtool_op_get_ts_info,1094 .get_link_ksettings = usbnet_get_link_ksettings_mii,1095 .set_link_ksettings = usbnet_set_link_ksettings_mii,1096};1097 1098/*-------------------------------------------------------------------------*/1099 1100static void __handle_link_change(struct usbnet *dev)1101{1102 if (!test_bit(EVENT_DEV_OPEN, &dev->flags))1103 return;1104 1105 if (!netif_carrier_ok(dev->net)) {1106 /* kill URBs for reading packets to save bus bandwidth */1107 unlink_urbs(dev, &dev->rxq);1108 1109 /*1110 * tx_timeout will unlink URBs for sending packets and1111 * tx queue is stopped by netcore after link becomes off1112 */1113 } else {1114 /* submitting URBs for reading packets */1115 tasklet_schedule(&dev->bh);1116 }1117 1118 /* hard_mtu or rx_urb_size may change during link change */1119 usbnet_update_max_qlen(dev);1120 1121 clear_bit(EVENT_LINK_CHANGE, &dev->flags);1122}1123 1124void usbnet_set_rx_mode(struct net_device *net)1125{1126 struct usbnet *dev = netdev_priv(net);1127 1128 usbnet_defer_kevent(dev, EVENT_SET_RX_MODE);1129}1130EXPORT_SYMBOL_GPL(usbnet_set_rx_mode);1131 1132static void __handle_set_rx_mode(struct usbnet *dev)1133{1134 if (dev->driver_info->set_rx_mode)1135 (dev->driver_info->set_rx_mode)(dev);1136 1137 clear_bit(EVENT_SET_RX_MODE, &dev->flags);1138}1139 1140/* work that cannot be done in interrupt context uses keventd.1141 *1142 * NOTE: with 2.5 we could do more of this using completion callbacks,1143 * especially now that control transfers can be queued.1144 */1145static void1146usbnet_deferred_kevent (struct work_struct *work)1147{1148 struct usbnet *dev =1149 container_of(work, struct usbnet, kevent);1150 int status;1151 1152 /* usb_clear_halt() needs a thread context */1153 if (test_bit (EVENT_TX_HALT, &dev->flags)) {1154 unlink_urbs (dev, &dev->txq);1155 status = usb_autopm_get_interface(dev->intf);1156 if (status < 0)1157 goto fail_pipe;1158 status = usb_clear_halt (dev->udev, dev->out);1159 usb_autopm_put_interface(dev->intf);1160 if (status < 0 &&1161 status != -EPIPE &&1162 status != -ESHUTDOWN) {1163 if (netif_msg_tx_err (dev))1164fail_pipe:1165 netdev_err(dev->net, "can't clear tx halt, status %d\n",1166 status);1167 } else {1168 clear_bit (EVENT_TX_HALT, &dev->flags);1169 if (status != -ESHUTDOWN)1170 netif_wake_queue (dev->net);1171 }1172 }1173 if (test_bit (EVENT_RX_HALT, &dev->flags)) {1174 unlink_urbs (dev, &dev->rxq);1175 status = usb_autopm_get_interface(dev->intf);1176 if (status < 0)1177 goto fail_halt;1178 status = usb_clear_halt (dev->udev, dev->in);1179 usb_autopm_put_interface(dev->intf);1180 if (status < 0 &&1181 status != -EPIPE &&1182 status != -ESHUTDOWN) {1183 if (netif_msg_rx_err (dev))1184fail_halt:1185 netdev_err(dev->net, "can't clear rx halt, status %d\n",1186 status);1187 } else {1188 clear_bit (EVENT_RX_HALT, &dev->flags);1189 if (!usbnet_going_away(dev))1190 tasklet_schedule(&dev->bh);1191 }1192 }1193 1194 /* tasklet could resubmit itself forever if memory is tight */1195 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {1196 struct urb *urb = NULL;1197 int resched = 1;1198 1199 if (netif_running (dev->net))1200 urb = usb_alloc_urb (0, GFP_KERNEL);1201 else1202 clear_bit (EVENT_RX_MEMORY, &dev->flags);1203 if (urb != NULL) {1204 clear_bit (EVENT_RX_MEMORY, &dev->flags);1205 status = usb_autopm_get_interface(dev->intf);1206 if (status < 0) {1207 usb_free_urb(urb);1208 goto fail_lowmem;1209 }1210 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)1211 resched = 0;1212 usb_autopm_put_interface(dev->intf);1213fail_lowmem:1214 if (resched)1215 if (!usbnet_going_away(dev))1216 tasklet_schedule(&dev->bh);1217 }1218 }1219 1220 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {1221 const struct driver_info *info = dev->driver_info;1222 int retval = 0;1223 1224 clear_bit (EVENT_LINK_RESET, &dev->flags);1225 status = usb_autopm_get_interface(dev->intf);1226 if (status < 0)1227 goto skip_reset;1228 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {1229 usb_autopm_put_interface(dev->intf);1230skip_reset:1231 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",1232 retval,1233 dev->udev->bus->bus_name,1234 dev->udev->devpath,1235 info->description);1236 } else {1237 usb_autopm_put_interface(dev->intf);1238 }1239 1240 /* handle link change from link resetting */1241 __handle_link_change(dev);1242 }1243 1244 if (test_bit (EVENT_LINK_CHANGE, &dev->flags))1245 __handle_link_change(dev);1246 1247 if (test_bit (EVENT_SET_RX_MODE, &dev->flags))1248 __handle_set_rx_mode(dev);1249 1250 1251 if (dev->flags)1252 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);1253}1254 1255/*-------------------------------------------------------------------------*/1256 1257static void tx_complete (struct urb *urb)1258{1259 struct sk_buff *skb = (struct sk_buff *) urb->context;1260 struct skb_data *entry = (struct skb_data *) skb->cb;1261 struct usbnet *dev = entry->dev;1262 1263 if (urb->status == 0) {1264 struct pcpu_sw_netstats *stats64 = this_cpu_ptr(dev->net->tstats);1265 unsigned long flags;1266 1267 flags = u64_stats_update_begin_irqsave(&stats64->syncp);1268 u64_stats_add(&stats64->tx_packets, entry->packets);1269 u64_stats_add(&stats64->tx_bytes, entry->length);1270 u64_stats_update_end_irqrestore(&stats64->syncp, flags);1271 } else {1272 dev->net->stats.tx_errors++;1273 1274 switch (urb->status) {1275 case -EPIPE:1276 usbnet_defer_kevent (dev, EVENT_TX_HALT);1277 break;1278 1279 /* software-driven interface shutdown */1280 case -ECONNRESET: // async unlink1281 case -ESHUTDOWN: // hardware gone1282 break;1283 1284 /* like rx, tx gets controller i/o faults during hub_wq1285 * delays and so it uses the same throttling mechanism.1286 */1287 case -EPROTO:1288 case -ETIME:1289 case -EILSEQ:1290 usb_mark_last_busy(dev->udev);1291 if (!timer_pending (&dev->delay)) {1292 mod_timer (&dev->delay,1293 jiffies + THROTTLE_JIFFIES);1294 netif_dbg(dev, link, dev->net,1295 "tx throttle %d\n", urb->status);1296 }1297 netif_stop_queue (dev->net);1298 break;1299 default:1300 netif_dbg(dev, tx_err, dev->net,1301 "tx err %d\n", entry->urb->status);1302 break;1303 }1304 }1305 1306 usb_autopm_put_interface_async(dev->intf);1307 (void) defer_bh(dev, skb, &dev->txq, tx_done);1308}1309 1310/*-------------------------------------------------------------------------*/1311 1312void usbnet_tx_timeout (struct net_device *net, unsigned int txqueue)1313{1314 struct usbnet *dev = netdev_priv(net);1315 1316 unlink_urbs (dev, &dev->txq);1317 tasklet_schedule (&dev->bh);1318 /* this needs to be handled individually because the generic layer1319 * doesn't know what is sufficient and could not restore private1320 * information if a remedy of an unconditional reset were used.1321 */1322 if (dev->driver_info->recover)1323 (dev->driver_info->recover)(dev);1324}1325EXPORT_SYMBOL_GPL(usbnet_tx_timeout);1326 1327/*-------------------------------------------------------------------------*/1328 1329static int build_dma_sg(const struct sk_buff *skb, struct urb *urb)1330{1331 unsigned num_sgs, total_len = 0;1332 int i, s = 0;1333 1334 num_sgs = skb_shinfo(skb)->nr_frags + 1;1335 if (num_sgs == 1)1336 return 0;1337 1338 /* reserve one for zero packet */1339 urb->sg = kmalloc_array(num_sgs + 1, sizeof(struct scatterlist),1340 GFP_ATOMIC);1341 if (!urb->sg)1342 return -ENOMEM;1343 1344 urb->num_sgs = num_sgs;1345 sg_init_table(urb->sg, urb->num_sgs + 1);1346 1347 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb));1348 total_len += skb_headlen(skb);1349 1350 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {1351 skb_frag_t *f = &skb_shinfo(skb)->frags[i];1352 1353 total_len += skb_frag_size(f);1354 sg_set_page(&urb->sg[i + s], skb_frag_page(f), skb_frag_size(f),1355 skb_frag_off(f));1356 }1357 urb->transfer_buffer_length = total_len;1358 1359 return 1;1360}1361 1362netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,1363 struct net_device *net)1364{1365 struct usbnet *dev = netdev_priv(net);1366 unsigned int length;1367 struct urb *urb = NULL;1368 struct skb_data *entry;1369 const struct driver_info *info = dev->driver_info;1370 unsigned long flags;1371 int retval;1372 1373 if (skb)1374 skb_tx_timestamp(skb);1375 1376 // some devices want funky USB-level framing, for1377 // win32 driver (usually) and/or hardware quirks1378 if (info->tx_fixup) {1379 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);1380 if (!skb) {1381 /* packet collected; minidriver waiting for more */1382 if (info->flags & FLAG_MULTI_PACKET)1383 goto not_drop;1384 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");1385 goto drop;1386 }1387 }1388 1389 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {1390 netif_dbg(dev, tx_err, dev->net, "no urb\n");1391 goto drop;1392 }1393 1394 entry = (struct skb_data *) skb->cb;1395 entry->urb = urb;1396 entry->dev = dev;1397 1398 usb_fill_bulk_urb (urb, dev->udev, dev->out,1399 skb->data, skb->len, tx_complete, skb);1400 if (dev->can_dma_sg) {1401 if (build_dma_sg(skb, urb) < 0)1402 goto drop;1403 }1404 length = urb->transfer_buffer_length;1405 1406 /* don't assume the hardware handles USB_ZERO_PACKET1407 * NOTE: strictly conforming cdc-ether devices should expect1408 * the ZLP here, but ignore the one-byte packet.1409 * NOTE2: CDC NCM specification is different from CDC ECM when1410 * handling ZLP/short packets, so cdc_ncm driver will make short1411 * packet itself if needed.1412 */1413 if (length % dev->maxpacket == 0) {1414 if (!(info->flags & FLAG_SEND_ZLP)) {1415 if (!(info->flags & FLAG_MULTI_PACKET)) {1416 length++;1417 if (skb_tailroom(skb) && !urb->num_sgs) {1418 skb->data[skb->len] = 0;1419 __skb_put(skb, 1);1420 } else if (urb->num_sgs)1421 sg_set_buf(&urb->sg[urb->num_sgs++],1422 dev->padding_pkt, 1);1423 }1424 } else1425 urb->transfer_flags |= URB_ZERO_PACKET;1426 }1427 urb->transfer_buffer_length = length;1428 1429 if (info->flags & FLAG_MULTI_PACKET) {1430 /* Driver has set number of packets and a length delta.1431 * Calculate the complete length and ensure that it's1432 * positive.1433 */1434 entry->length += length;1435 if (WARN_ON_ONCE(entry->length <= 0))1436 entry->length = length;1437 } else {1438 usbnet_set_skb_tx_stats(skb, 1, length);1439 }1440 1441 spin_lock_irqsave(&dev->txq.lock, flags);1442 retval = usb_autopm_get_interface_async(dev->intf);1443 if (retval < 0) {1444 spin_unlock_irqrestore(&dev->txq.lock, flags);1445 goto drop;1446 }1447 if (netif_queue_stopped(net)) {1448 usb_autopm_put_interface_async(dev->intf);1449 spin_unlock_irqrestore(&dev->txq.lock, flags);1450 goto drop;1451 }1452 1453#ifdef CONFIG_PM1454 /* if this triggers the device is still a sleep */1455 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {1456 /* transmission will be done in resume */1457 usb_anchor_urb(urb, &dev->deferred);1458 /* no use to process more packets */1459 netif_stop_queue(net);1460 usb_put_urb(urb);1461 spin_unlock_irqrestore(&dev->txq.lock, flags);1462 netdev_dbg(dev->net, "Delaying transmission for resumption\n");1463 goto deferred;1464 }1465#endif1466 1467 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {1468 case -EPIPE:1469 netif_stop_queue (net);1470 usbnet_defer_kevent (dev, EVENT_TX_HALT);1471 usb_autopm_put_interface_async(dev->intf);1472 break;1473 default:1474 usb_autopm_put_interface_async(dev->intf);1475 netif_dbg(dev, tx_err, dev->net,1476 "tx: submit urb err %d\n", retval);1477 break;1478 case 0:1479 netif_trans_update(net);1480 __usbnet_queue_skb(&dev->txq, skb, tx_start);1481 if (dev->txq.qlen >= TX_QLEN (dev))1482 netif_stop_queue (net);1483 }1484 spin_unlock_irqrestore (&dev->txq.lock, flags);1485 1486 if (retval) {1487 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);1488drop:1489 dev->net->stats.tx_dropped++;1490not_drop:1491 if (skb)1492 dev_kfree_skb_any (skb);1493 if (urb) {1494 kfree(urb->sg);1495 usb_free_urb(urb);1496 }1497 } else1498 netif_dbg(dev, tx_queued, dev->net,1499 "> tx, len %u, type 0x%x\n", length, skb->protocol);1500#ifdef CONFIG_PM1501deferred:1502#endif1503 return NETDEV_TX_OK;1504}1505EXPORT_SYMBOL_GPL(usbnet_start_xmit);1506 1507static int rx_alloc_submit(struct usbnet *dev, gfp_t flags)1508{1509 struct urb *urb;1510 int i;1511 int ret = 0;1512 1513 /* don't refill the queue all at once */1514 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) {1515 urb = usb_alloc_urb(0, flags);1516 if (urb != NULL) {1517 ret = rx_submit(dev, urb, flags);1518 if (ret)1519 goto err;1520 } else {1521 ret = -ENOMEM;1522 goto err;1523 }1524 }1525err:1526 return ret;1527}1528 1529static inline void usb_free_skb(struct sk_buff *skb)1530{1531 struct skb_data *entry = (struct skb_data *)skb->cb;1532 1533 usb_free_urb(entry->urb);1534 dev_kfree_skb(skb);1535}1536 1537/*-------------------------------------------------------------------------*/1538 1539// tasklet (work deferred from completions, in_irq) or timer1540 1541static void usbnet_bh (struct timer_list *t)1542{1543 struct usbnet *dev = from_timer(dev, t, delay);1544 struct sk_buff *skb;1545 struct skb_data *entry;1546 1547 while ((skb = skb_dequeue (&dev->done))) {1548 entry = (struct skb_data *) skb->cb;1549 switch (entry->state) {1550 case rx_done:1551 if (rx_process(dev, skb))1552 usb_free_skb(skb);1553 continue;1554 case tx_done:1555 kfree(entry->urb->sg);1556 fallthrough;1557 case rx_cleanup:1558 usb_free_skb(skb);1559 continue;1560 default:1561 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);1562 }1563 }1564 1565 /* restart RX again after disabling due to high error rate */1566 clear_bit(EVENT_RX_KILL, &dev->flags);1567 1568 /* waiting for all pending urbs to complete?1569 * only then can we forgo submitting anew1570 */1571 if (waitqueue_active(&dev->wait)) {1572 if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0)1573 wake_up_all(&dev->wait);1574 1575 // or are we maybe short a few urbs?1576 } else if (netif_running (dev->net) &&1577 netif_device_present (dev->net) &&1578 netif_carrier_ok(dev->net) &&1579 !usbnet_going_away(dev) &&1580 !timer_pending(&dev->delay) &&1581 !test_bit(EVENT_RX_PAUSED, &dev->flags) &&1582 !test_bit(EVENT_RX_HALT, &dev->flags)) {1583 int temp = dev->rxq.qlen;1584 1585 if (temp < RX_QLEN(dev)) {1586 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK)1587 return;1588 if (temp != dev->rxq.qlen)1589 netif_dbg(dev, link, dev->net,1590 "rxqlen %d --> %d\n",1591 temp, dev->rxq.qlen);1592 if (dev->rxq.qlen < RX_QLEN(dev))1593 tasklet_schedule (&dev->bh);1594 }1595 if (dev->txq.qlen < TX_QLEN (dev))1596 netif_wake_queue (dev->net);1597 }1598}1599 1600static void usbnet_bh_tasklet(struct tasklet_struct *t)1601{1602 struct usbnet *dev = from_tasklet(dev, t, bh);1603 1604 usbnet_bh(&dev->delay);1605}1606 1607 1608/*-------------------------------------------------------------------------1609 *1610 * USB Device Driver support1611 *1612 *-------------------------------------------------------------------------*/1613 1614// precondition: never called in_interrupt1615 1616void usbnet_disconnect (struct usb_interface *intf)1617{1618 struct usbnet *dev;1619 struct usb_device *xdev;1620 struct net_device *net;1621 struct urb *urb;1622 1623 dev = usb_get_intfdata(intf);1624 usb_set_intfdata(intf, NULL);1625 if (!dev)1626 return;1627 usbnet_mark_going_away(dev);1628 1629 xdev = interface_to_usbdev (intf);1630 1631 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",1632 intf->dev.driver->name,1633 xdev->bus->bus_name, xdev->devpath,1634 dev->driver_info->description);1635 1636 net = dev->net;1637 unregister_netdev (net);1638 1639 while ((urb = usb_get_from_anchor(&dev->deferred))) {1640 dev_kfree_skb(urb->context);1641 kfree(urb->sg);1642 usb_free_urb(urb);1643 }1644 1645 if (dev->driver_info->unbind)1646 dev->driver_info->unbind(dev, intf);1647 1648 usb_kill_urb(dev->interrupt);1649 usb_free_urb(dev->interrupt);1650 kfree(dev->padding_pkt);1651 1652 free_netdev(net);1653}1654EXPORT_SYMBOL_GPL(usbnet_disconnect);1655 1656static const struct net_device_ops usbnet_netdev_ops = {1657 .ndo_open = usbnet_open,1658 .ndo_stop = usbnet_stop,1659 .ndo_start_xmit = usbnet_start_xmit,1660 .ndo_tx_timeout = usbnet_tx_timeout,1661 .ndo_set_rx_mode = usbnet_set_rx_mode,1662 .ndo_change_mtu = usbnet_change_mtu,1663 .ndo_set_mac_address = eth_mac_addr,1664 .ndo_validate_addr = eth_validate_addr,1665};1666 1667/*-------------------------------------------------------------------------*/1668 1669// precondition: never called in_interrupt1670 1671static const struct device_type wlan_type = {1672 .name = "wlan",1673};1674 1675static const struct device_type wwan_type = {1676 .name = "wwan",1677};1678 1679int1680usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)1681{1682 struct usbnet *dev;1683 struct net_device *net;1684 struct usb_host_interface *interface;1685 const struct driver_info *info;1686 struct usb_device *xdev;1687 int status;1688 const char *name;1689 struct usb_driver *driver = to_usb_driver(udev->dev.driver);1690 1691 /* usbnet already took usb runtime pm, so have to enable the feature1692 * for usb interface, otherwise usb_autopm_get_interface may return1693 * failure if RUNTIME_PM is enabled.1694 */1695 if (!driver->supports_autosuspend) {1696 driver->supports_autosuspend = 1;1697 pm_runtime_enable(&udev->dev);1698 }1699 1700 name = udev->dev.driver->name;1701 info = (const struct driver_info *) prod->driver_info;1702 if (!info) {1703 dev_dbg (&udev->dev, "blacklisted by %s\n", name);1704 return -ENODEV;1705 }1706 xdev = interface_to_usbdev (udev);1707 interface = udev->cur_altsetting;1708 1709 status = -ENOMEM;1710 1711 // set up our own records1712 net = alloc_etherdev(sizeof(*dev));1713 if (!net)1714 goto out;1715 1716 /* netdev_printk() needs this so do it as early as possible */1717 SET_NETDEV_DEV(net, &udev->dev);1718 1719 dev = netdev_priv(net);1720 dev->udev = xdev;1721 dev->intf = udev;1722 dev->driver_info = info;1723 dev->driver_name = name;1724 dev->rx_speed = SPEED_UNSET;1725 dev->tx_speed = SPEED_UNSET;1726 1727 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV1728 | NETIF_MSG_PROBE | NETIF_MSG_LINK);1729 init_waitqueue_head(&dev->wait);1730 skb_queue_head_init (&dev->rxq);1731 skb_queue_head_init (&dev->txq);1732 skb_queue_head_init (&dev->done);1733 skb_queue_head_init(&dev->rxq_pause);1734 tasklet_setup(&dev->bh, usbnet_bh_tasklet);1735 INIT_WORK (&dev->kevent, usbnet_deferred_kevent);1736 init_usb_anchor(&dev->deferred);1737 timer_setup(&dev->delay, usbnet_bh, 0);1738 mutex_init (&dev->phy_mutex);1739 mutex_init(&dev->interrupt_mutex);1740 dev->interrupt_count = 0;1741 1742 dev->net = net;1743 strscpy(net->name, "usb%d", sizeof(net->name));1744 1745 /* rx and tx sides can use different message sizes;1746 * bind() should set rx_urb_size in that case.1747 */1748 dev->hard_mtu = net->mtu + net->hard_header_len;1749 net->min_mtu = 0;1750 net->max_mtu = ETH_MAX_MTU;1751 net->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;1752 1753 net->netdev_ops = &usbnet_netdev_ops;1754 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;1755 net->ethtool_ops = &usbnet_ethtool_ops;1756 net->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;1757 1758 // allow device-specific bind/init procedures1759 // NOTE net->name still not usable ...1760 if (info->bind) {1761 status = info->bind (dev, udev);1762 if (status < 0)1763 goto out1;1764 1765 // heuristic: "usb%d" for links we know are two-host,1766 // else "eth%d" when there's reasonable doubt. userspace1767 // can rename the link if it knows better.1768 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&1769 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 ||1770 /* somebody touched it*/1771 !is_zero_ether_addr(net->dev_addr)))1772 strscpy(net->name, "eth%d", sizeof(net->name));1773 /* WLAN devices should always be named "wlan%d" */1774 if ((dev->driver_info->flags & FLAG_WLAN) != 0)1775 strscpy(net->name, "wlan%d", sizeof(net->name));1776 /* WWAN devices should always be named "wwan%d" */1777 if ((dev->driver_info->flags & FLAG_WWAN) != 0)1778 strscpy(net->name, "wwan%d", sizeof(net->name));1779 1780 /* devices that cannot do ARP */1781 if ((dev->driver_info->flags & FLAG_NOARP) != 0)1782 net->flags |= IFF_NOARP;1783 1784 /* maybe the remote can't receive an Ethernet MTU */1785 if (net->mtu > (dev->hard_mtu - net->hard_header_len))1786 net->mtu = dev->hard_mtu - net->hard_header_len;1787 } else if (!info->in || !info->out)1788 status = usbnet_get_endpoints (dev, udev);1789 else {1790 u8 ep_addrs[3] = {1791 info->in + USB_DIR_IN, info->out + USB_DIR_OUT, 01792 };1793 1794 dev->in = usb_rcvbulkpipe (xdev, info->in);1795 dev->out = usb_sndbulkpipe (xdev, info->out);1796 if (!(info->flags & FLAG_NO_SETINT))1797 status = usb_set_interface (xdev,1798 interface->desc.bInterfaceNumber,1799 interface->desc.bAlternateSetting);1800 else1801 status = 0;1802 1803 if (status == 0 && !usb_check_bulk_endpoints(udev, ep_addrs))1804 status = -EINVAL;1805 }1806 if (status >= 0 && dev->status)1807 status = init_status (dev, udev);1808 if (status < 0)1809 goto out3;1810 1811 if (!dev->rx_urb_size)1812 dev->rx_urb_size = dev->hard_mtu;1813 dev->maxpacket = usb_maxpacket(dev->udev, dev->out);1814 if (dev->maxpacket == 0) {1815 /* that is a broken device */1816 status = -ENODEV;1817 goto out4;1818 }1819 1820 /* this flags the device for user space */1821 if (!is_valid_ether_addr(net->dev_addr))1822 eth_hw_addr_random(net);1823 1824 if ((dev->driver_info->flags & FLAG_WLAN) != 0)1825 SET_NETDEV_DEVTYPE(net, &wlan_type);1826 if ((dev->driver_info->flags & FLAG_WWAN) != 0)1827 SET_NETDEV_DEVTYPE(net, &wwan_type);1828 1829 /* initialize max rx_qlen and tx_qlen */1830 usbnet_update_max_qlen(dev);1831 1832 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) &&1833 !(info->flags & FLAG_MULTI_PACKET)) {1834 dev->padding_pkt = kzalloc(1, GFP_KERNEL);1835 if (!dev->padding_pkt) {1836 status = -ENOMEM;1837 goto out4;1838 }1839 }1840 1841 status = register_netdev (net);1842 if (status)1843 goto out5;1844 netif_info(dev, probe, dev->net,1845 "register '%s' at usb-%s-%s, %s, %pM\n",1846 udev->dev.driver->name,1847 xdev->bus->bus_name, xdev->devpath,1848 dev->driver_info->description,1849 net->dev_addr);1850 1851 // ok, it's ready to go.1852 usb_set_intfdata (udev, dev);1853 1854 netif_device_attach (net);1855 1856 if (dev->driver_info->flags & FLAG_LINK_INTR)1857 usbnet_link_change(dev, 0, 0);1858 1859 return 0;1860 1861out5:1862 kfree(dev->padding_pkt);1863out4:1864 usb_free_urb(dev->interrupt);1865out3:1866 if (info->unbind)1867 info->unbind (dev, udev);1868out1:1869 /* subdrivers must undo all they did in bind() if they1870 * fail it, but we may fail later and a deferred kevent1871 * may trigger an error resubmitting itself and, worse,1872 * schedule a timer. So we kill it all just in case.1873 */1874 usbnet_mark_going_away(dev);1875 cancel_work_sync(&dev->kevent);1876 del_timer_sync(&dev->delay);1877 free_netdev(net);1878out:1879 return status;1880}1881EXPORT_SYMBOL_GPL(usbnet_probe);1882 1883/*-------------------------------------------------------------------------*/1884 1885/*1886 * suspend the whole driver as soon as the first interface is suspended1887 * resume only when the last interface is resumed1888 */1889 1890int usbnet_suspend (struct usb_interface *intf, pm_message_t message)1891{1892 struct usbnet *dev = usb_get_intfdata(intf);1893 1894 if (!dev->suspend_count++) {1895 spin_lock_irq(&dev->txq.lock);1896 /* don't autosuspend while transmitting */1897 if (dev->txq.qlen && PMSG_IS_AUTO(message)) {1898 dev->suspend_count--;1899 spin_unlock_irq(&dev->txq.lock);1900 return -EBUSY;1901 } else {1902 set_bit(EVENT_DEV_ASLEEP, &dev->flags);1903 spin_unlock_irq(&dev->txq.lock);1904 }1905 /*1906 * accelerate emptying of the rx and queues, to avoid1907 * having everything error out.1908 */1909 netif_device_detach (dev->net);1910 usbnet_terminate_urbs(dev);1911 __usbnet_status_stop_force(dev);1912 1913 /*1914 * reattach so runtime management can use and1915 * wake the device1916 */1917 netif_device_attach (dev->net);1918 }1919 return 0;1920}1921EXPORT_SYMBOL_GPL(usbnet_suspend);1922 1923int usbnet_resume (struct usb_interface *intf)1924{1925 struct usbnet *dev = usb_get_intfdata(intf);1926 struct sk_buff *skb;1927 struct urb *res;1928 int retval;1929 1930 if (!--dev->suspend_count) {1931 /* resume interrupt URB if it was previously submitted */1932 __usbnet_status_start_force(dev, GFP_NOIO);1933 1934 spin_lock_irq(&dev->txq.lock);1935 while ((res = usb_get_from_anchor(&dev->deferred))) {1936 1937 skb = (struct sk_buff *)res->context;1938 retval = usb_submit_urb(res, GFP_ATOMIC);1939 if (retval < 0) {1940 dev_kfree_skb_any(skb);1941 kfree(res->sg);1942 usb_free_urb(res);1943 usb_autopm_put_interface_async(dev->intf);1944 } else {1945 netif_trans_update(dev->net);1946 __skb_queue_tail(&dev->txq, skb);1947 }1948 }1949 1950 smp_mb();1951 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);1952 spin_unlock_irq(&dev->txq.lock);1953 1954 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) {1955 /* handle remote wakeup ASAP1956 * we cannot race against stop1957 */1958 if (netif_device_present(dev->net) &&1959 !timer_pending(&dev->delay) &&1960 !test_bit(EVENT_RX_HALT, &dev->flags))1961 rx_alloc_submit(dev, GFP_NOIO);1962 1963 if (!(dev->txq.qlen >= TX_QLEN(dev)))1964 netif_tx_wake_all_queues(dev->net);1965 tasklet_schedule (&dev->bh);1966 }1967 }1968 1969 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags))1970 usb_autopm_get_interface_no_resume(intf);1971 1972 return 0;1973}1974EXPORT_SYMBOL_GPL(usbnet_resume);1975 1976/*1977 * Either a subdriver implements manage_power, then it is assumed to always1978 * be ready to be suspended or it reports the readiness to be suspended1979 * explicitly1980 */1981void usbnet_device_suggests_idle(struct usbnet *dev)1982{1983 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) {1984 dev->intf->needs_remote_wakeup = 1;1985 usb_autopm_put_interface_async(dev->intf);1986 }1987}1988EXPORT_SYMBOL(usbnet_device_suggests_idle);1989 1990/*1991 * For devices that can do without special commands1992 */1993int usbnet_manage_power(struct usbnet *dev, int on)1994{1995 dev->intf->needs_remote_wakeup = on;1996 return 0;1997}1998EXPORT_SYMBOL(usbnet_manage_power);1999 2000void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset)2001{2002 /* update link after link is reseted */2003 if (link && !need_reset)2004 netif_carrier_on(dev->net);2005 else2006 netif_carrier_off(dev->net);2007 2008 if (need_reset && link)2009 usbnet_defer_kevent(dev, EVENT_LINK_RESET);2010 else2011 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);2012}2013EXPORT_SYMBOL(usbnet_link_change);2014 2015/*-------------------------------------------------------------------------*/2016static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,2017 u16 value, u16 index, void *data, u16 size)2018{2019 void *buf = NULL;2020 int err = -ENOMEM;2021 2022 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x"2023 " value=0x%04x index=0x%04x size=%d\n",2024 cmd, reqtype, value, index, size);2025 2026 if (size) {2027 buf = kmalloc(size, GFP_NOIO);2028 if (!buf)2029 goto out;2030 }2031 2032 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),2033 cmd, reqtype, value, index, buf, size,2034 USB_CTRL_GET_TIMEOUT);2035 if (err > 0 && err <= size) {2036 if (data)2037 memcpy(data, buf, err);2038 else2039 netdev_dbg(dev->net,2040 "Huh? Data requested but thrown away.\n");2041 }2042 kfree(buf);2043out:2044 return err;2045}2046 2047static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,2048 u16 value, u16 index, const void *data,2049 u16 size)2050{2051 void *buf = NULL;2052 int err = -ENOMEM;2053 2054 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"2055 " value=0x%04x index=0x%04x size=%d\n",2056 cmd, reqtype, value, index, size);2057 2058 if (data) {2059 buf = kmemdup(data, size, GFP_NOIO);2060 if (!buf)2061 goto out;2062 } else {2063 if (size) {2064 WARN_ON_ONCE(1);2065 err = -EINVAL;2066 goto out;2067 }2068 }2069 2070 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),2071 cmd, reqtype, value, index, buf, size,2072 USB_CTRL_SET_TIMEOUT);2073 kfree(buf);2074 2075out:2076 return err;2077}2078 2079/*2080 * The function can't be called inside suspend/resume callback,2081 * otherwise deadlock will be caused.2082 */2083int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,2084 u16 value, u16 index, void *data, u16 size)2085{2086 int ret;2087 2088 if (usb_autopm_get_interface(dev->intf) < 0)2089 return -ENODEV;2090 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index,2091 data, size);2092 usb_autopm_put_interface(dev->intf);2093 return ret;2094}2095EXPORT_SYMBOL_GPL(usbnet_read_cmd);2096 2097/*2098 * The function can't be called inside suspend/resume callback,2099 * otherwise deadlock will be caused.2100 */2101int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,2102 u16 value, u16 index, const void *data, u16 size)2103{2104 int ret;2105 2106 if (usb_autopm_get_interface(dev->intf) < 0)2107 return -ENODEV;2108 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index,2109 data, size);2110 usb_autopm_put_interface(dev->intf);2111 return ret;2112}2113EXPORT_SYMBOL_GPL(usbnet_write_cmd);2114 2115/*2116 * The function can be called inside suspend/resume callback safely2117 * and should only be called by suspend/resume callback generally.2118 */2119int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,2120 u16 value, u16 index, void *data, u16 size)2121{2122 return __usbnet_read_cmd(dev, cmd, reqtype, value, index,2123 data, size);2124}2125EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm);2126 2127/*2128 * The function can be called inside suspend/resume callback safely2129 * and should only be called by suspend/resume callback generally.2130 */2131int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,2132 u16 value, u16 index, const void *data,2133 u16 size)2134{2135 return __usbnet_write_cmd(dev, cmd, reqtype, value, index,2136 data, size);2137}2138EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm);2139 2140static void usbnet_async_cmd_cb(struct urb *urb)2141{2142 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;2143 int status = urb->status;2144 2145 if (status < 0)2146 dev_dbg(&urb->dev->dev, "%s failed with %d",2147 __func__, status);2148 2149 kfree(req);2150 usb_free_urb(urb);2151}2152 2153/*2154 * The caller must make sure that device can't be put into suspend2155 * state until the control URB completes.2156 */2157int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,2158 u16 value, u16 index, const void *data, u16 size)2159{2160 struct usb_ctrlrequest *req;2161 struct urb *urb;2162 int err = -ENOMEM;2163 void *buf = NULL;2164 2165 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"2166 " value=0x%04x index=0x%04x size=%d\n",2167 cmd, reqtype, value, index, size);2168 2169 urb = usb_alloc_urb(0, GFP_ATOMIC);2170 if (!urb)2171 goto fail;2172 2173 if (data) {2174 buf = kmemdup(data, size, GFP_ATOMIC);2175 if (!buf) {2176 netdev_err(dev->net, "Error allocating buffer"2177 " in %s!\n", __func__);2178 goto fail_free_urb;2179 }2180 }2181 2182 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);2183 if (!req)2184 goto fail_free_buf;2185 2186 req->bRequestType = reqtype;2187 req->bRequest = cmd;2188 req->wValue = cpu_to_le16(value);2189 req->wIndex = cpu_to_le16(index);2190 req->wLength = cpu_to_le16(size);2191 2192 usb_fill_control_urb(urb, dev->udev,2193 usb_sndctrlpipe(dev->udev, 0),2194 (void *)req, buf, size,2195 usbnet_async_cmd_cb, req);2196 urb->transfer_flags |= URB_FREE_BUFFER;2197 2198 err = usb_submit_urb(urb, GFP_ATOMIC);2199 if (err < 0) {2200 netdev_err(dev->net, "Error submitting the control"2201 " message: status=%d\n", err);2202 goto fail_free_all;2203 }2204 return 0;2205 2206fail_free_all:2207 kfree(req);2208fail_free_buf:2209 kfree(buf);2210 /*2211 * avoid a double free2212 * needed because the flag can be set only2213 * after filling the URB2214 */2215 urb->transfer_flags = 0;2216fail_free_urb:2217 usb_free_urb(urb);2218fail:2219 return err;2220 2221}2222EXPORT_SYMBOL_GPL(usbnet_write_cmd_async);2223/*-------------------------------------------------------------------------*/2224 2225static int __init usbnet_init(void)2226{2227 /* Compiler should optimize this out. */2228 BUILD_BUG_ON(2229 sizeof_field(struct sk_buff, cb) < sizeof(struct skb_data));2230 2231 return 0;2232}2233module_init(usbnet_init);2234 2235static void __exit usbnet_exit(void)2236{2237}2238module_exit(usbnet_exit);2239 2240MODULE_AUTHOR("David Brownell");2241MODULE_DESCRIPTION("USB network driver framework");2242MODULE_LICENSE("GPL");2243