2 * USB Network driver infrastructure
3 * Copyright (C) 2000-2005 by David Brownell
4 * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
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.
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.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * This is a generic "USB networking" framework that works with several
23 * kinds of full and high speed networking devices: host-to-host cables,
24 * smart usb peripherals, and actual Ethernet adapters.
26 * These devices usually differ in terms of control protocols (if they
27 * even have one!) and sometimes they define new framing to wrap or batch
28 * Ethernet packets. Otherwise, they talk to USB pretty much the same,
29 * so interface (un)binding, endpoint I/O queues, fault handling, and other
30 * issues can usefully be addressed by this framework.
33 // #define DEBUG // error path messages, extra info
34 // #define VERBOSE // more; success messages
36 #include <linux/module.h>
37 #include <linux/init.h>
38 #include <linux/netdevice.h>
39 #include <linux/etherdevice.h>
40 #include <linux/ctype.h>
41 #include <linux/ethtool.h>
42 #include <linux/workqueue.h>
43 #include <linux/mii.h>
44 #include <linux/usb.h>
45 #include <linux/usb/usbnet.h>
46 #include <linux/slab.h>
47 #include <linux/kernel.h>
48 #include <linux/pm_runtime.h>
50 #define DRIVER_VERSION "22-Aug-2005"
53 /*-------------------------------------------------------------------------*/
56 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max.
57 * Several dozen bytes of IPv4 data can fit in two such transactions.
58 * One maximum size Ethernet packet takes twenty four of them.
59 * For high speed, each frame comfortably fits almost 36 max size
60 * Ethernet packets (so queues should be bigger).
62 * REVISIT qlens should be members of 'struct usbnet'; the goal is to
63 * let the USB host controller be busy for 5msec or more before an irq
64 * is required, under load. Jumbograms change the equation.
66 #define RX_MAX_QUEUE_MEMORY (60 * 1518)
67 #define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
68 (RX_MAX_QUEUE_MEMORY/(dev)->rx_urb_size) : 4)
69 #define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
70 (RX_MAX_QUEUE_MEMORY/(dev)->hard_mtu) : 4)
72 // reawaken network queue this soon after stopping; else watchdog barks
73 #define TX_TIMEOUT_JIFFIES (5*HZ)
75 // throttle rx/tx briefly after some faults, so khubd might disconnect()
76 // us (it polls at HZ/4 usually) before we report too many false errors.
77 #define THROTTLE_JIFFIES (HZ/8)
80 #define UNLINK_TIMEOUT_MS 3
82 /*-------------------------------------------------------------------------*/
84 // randomly generated ethernet address
85 static u8 node_id [ETH_ALEN];
87 static const char driver_name [] = "usbnet";
89 /* use ethtool to change the level for any given device */
90 static int msg_level = -1;
91 module_param (msg_level, int, 0);
92 MODULE_PARM_DESC (msg_level, "Override default message level");
94 /*-------------------------------------------------------------------------*/
96 /* handles CDC Ethernet and many other network "bulk data" interfaces */
97 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
100 struct usb_host_interface *alt = NULL;
101 struct usb_host_endpoint *in = NULL, *out = NULL;
102 struct usb_host_endpoint *status = NULL;
104 for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
107 in = out = status = NULL;
108 alt = intf->altsetting + tmp;
110 /* take the first altsetting with in-bulk + out-bulk;
111 * remember any status endpoint, just in case;
112 * ignore other endpoints and altsettings.
114 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
115 struct usb_host_endpoint *e;
118 e = alt->endpoint + ep;
119 switch (e->desc.bmAttributes) {
120 case USB_ENDPOINT_XFER_INT:
121 if (!usb_endpoint_dir_in(&e->desc))
125 case USB_ENDPOINT_XFER_BULK:
130 if (usb_endpoint_dir_in(&e->desc)) {
133 else if (intr && !status)
143 if (!alt || !in || !out)
146 if (alt->desc.bAlternateSetting != 0 ||
147 !(dev->driver_info->flags & FLAG_NO_SETINT)) {
148 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber,
149 alt->desc.bAlternateSetting);
154 dev->in = usb_rcvbulkpipe (dev->udev,
155 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
156 dev->out = usb_sndbulkpipe (dev->udev,
157 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
158 dev->status = status;
161 EXPORT_SYMBOL_GPL(usbnet_get_endpoints);
163 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress)
166 unsigned char buf [13];
168 tmp = usb_string(dev->udev, iMACAddress, buf, sizeof buf);
170 dev_dbg(&dev->udev->dev,
171 "bad MAC string %d fetch, %d\n", iMACAddress, tmp);
176 for (i = tmp = 0; i < 6; i++, tmp += 2)
177 dev->net->dev_addr [i] =
178 (hex_to_bin(buf[tmp]) << 4) + hex_to_bin(buf[tmp + 1]);
181 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr);
183 static void intr_complete (struct urb *urb)
185 struct usbnet *dev = urb->context;
186 int status = urb->status;
191 dev->driver_info->status(dev, urb);
194 /* software-driven interface shutdown */
195 case -ENOENT: /* urb killed */
196 case -ESHUTDOWN: /* hardware gone */
197 netif_dbg(dev, ifdown, dev->net,
198 "intr shutdown, code %d\n", status);
201 /* NOTE: not throttling like RX/TX, since this endpoint
202 * already polls infrequently
205 netdev_dbg(dev->net, "intr status %d\n", status);
209 if (!netif_running (dev->net))
212 status = usb_submit_urb (urb, GFP_ATOMIC);
214 netif_err(dev, timer, dev->net,
215 "intr resubmit --> %d\n", status);
218 static int init_status (struct usbnet *dev, struct usb_interface *intf)
225 if (!dev->driver_info->status)
228 pipe = usb_rcvintpipe (dev->udev,
229 dev->status->desc.bEndpointAddress
230 & USB_ENDPOINT_NUMBER_MASK);
231 maxp = usb_maxpacket (dev->udev, pipe, 0);
233 /* avoid 1 msec chatter: min 8 msec poll rate */
234 period = max ((int) dev->status->desc.bInterval,
235 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3);
237 buf = kmalloc (maxp, GFP_KERNEL);
239 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL);
240 if (!dev->interrupt) {
244 usb_fill_int_urb(dev->interrupt, dev->udev, pipe,
245 buf, maxp, intr_complete, dev, period);
246 dev->interrupt->transfer_flags |= URB_FREE_BUFFER;
248 "status ep%din, %d bytes period %d\n",
249 usb_pipeendpoint(pipe), maxp, period);
255 /* Passes this packet up the stack, updating its accounting.
256 * Some link protocols batch packets, so their rx_fixup paths
257 * can return clones as well as just modify the original skb.
259 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
263 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) {
264 skb_queue_tail(&dev->rxq_pause, skb);
268 skb->protocol = eth_type_trans (skb, dev->net);
269 dev->net->stats.rx_packets++;
270 dev->net->stats.rx_bytes += skb->len;
272 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n",
273 skb->len + sizeof (struct ethhdr), skb->protocol);
274 memset (skb->cb, 0, sizeof (struct skb_data));
276 if (skb_defer_rx_timestamp(skb))
279 status = netif_rx (skb);
280 if (status != NET_RX_SUCCESS)
281 netif_dbg(dev, rx_err, dev->net,
282 "netif_rx status %d\n", status);
284 EXPORT_SYMBOL_GPL(usbnet_skb_return);
287 /*-------------------------------------------------------------------------
289 * Network Device Driver (peer link to "Host Device", from USB host)
291 *-------------------------------------------------------------------------*/
293 int usbnet_change_mtu (struct net_device *net, int new_mtu)
295 struct usbnet *dev = netdev_priv(net);
296 int ll_mtu = new_mtu + net->hard_header_len;
297 int old_hard_mtu = dev->hard_mtu;
298 int old_rx_urb_size = dev->rx_urb_size;
302 // no second zero-length packet read wanted after mtu-sized packets
303 if ((ll_mtu % dev->maxpacket) == 0)
307 dev->hard_mtu = net->mtu + net->hard_header_len;
308 if (dev->rx_urb_size == old_hard_mtu) {
309 dev->rx_urb_size = dev->hard_mtu;
310 if (dev->rx_urb_size > old_rx_urb_size)
311 usbnet_unlink_rx_urbs(dev);
316 EXPORT_SYMBOL_GPL(usbnet_change_mtu);
318 /* The caller must hold list->lock */
319 static void __usbnet_queue_skb(struct sk_buff_head *list,
320 struct sk_buff *newsk, enum skb_state state)
322 struct skb_data *entry = (struct skb_data *) newsk->cb;
324 __skb_queue_tail(list, newsk);
325 entry->state = state;
328 /*-------------------------------------------------------------------------*/
330 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
331 * completion callbacks. 2.5 should have fixed those bugs...
334 static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb,
335 struct sk_buff_head *list, enum skb_state state)
338 enum skb_state old_state;
339 struct skb_data *entry = (struct skb_data *) skb->cb;
341 spin_lock_irqsave(&list->lock, flags);
342 old_state = entry->state;
343 entry->state = state;
344 __skb_unlink(skb, list);
345 spin_unlock(&list->lock);
346 spin_lock(&dev->done.lock);
347 __skb_queue_tail(&dev->done, skb);
348 if (dev->done.qlen == 1)
349 tasklet_schedule(&dev->bh);
350 spin_unlock_irqrestore(&dev->done.lock, flags);
354 /* some work can't be done in tasklets, so we use keventd
356 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
357 * but tasklet_schedule() doesn't. hope the failure is rare.
359 void usbnet_defer_kevent (struct usbnet *dev, int work)
361 set_bit (work, &dev->flags);
362 if (!schedule_work (&dev->kevent)) {
364 netdev_err(dev->net, "kevent %d may have been dropped\n", work);
366 netdev_dbg(dev->net, "kevent %d scheduled\n", work);
369 EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
371 /*-------------------------------------------------------------------------*/
373 static void rx_complete (struct urb *urb);
375 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
378 struct skb_data *entry;
380 unsigned long lockflags;
381 size_t size = dev->rx_urb_size;
383 /* prevent rx skb allocation when error ratio is high */
384 if (test_bit(EVENT_RX_KILL, &dev->flags)) {
389 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);
391 netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
392 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
397 entry = (struct skb_data *) skb->cb;
402 usb_fill_bulk_urb (urb, dev->udev, dev->in,
403 skb->data, size, rx_complete, skb);
405 spin_lock_irqsave (&dev->rxq.lock, lockflags);
407 if (netif_running (dev->net) &&
408 netif_device_present (dev->net) &&
409 !test_bit (EVENT_RX_HALT, &dev->flags) &&
410 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
411 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
413 usbnet_defer_kevent (dev, EVENT_RX_HALT);
416 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
419 netif_dbg(dev, ifdown, dev->net, "device gone\n");
420 netif_device_detach (dev->net);
426 netif_dbg(dev, rx_err, dev->net,
427 "rx submit, %d\n", retval);
428 tasklet_schedule (&dev->bh);
431 __usbnet_queue_skb(&dev->rxq, skb, rx_start);
434 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
437 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
439 dev_kfree_skb_any (skb);
446 /*-------------------------------------------------------------------------*/
448 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
450 if (dev->driver_info->rx_fixup &&
451 !dev->driver_info->rx_fixup (dev, skb)) {
452 /* With RX_ASSEMBLE, rx_fixup() must update counters */
453 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE))
454 dev->net->stats.rx_errors++;
457 // else network stack removes extra byte if we forced a short packet
460 /* all data was already cloned from skb inside the driver */
461 if (dev->driver_info->flags & FLAG_MULTI_PACKET)
462 dev_kfree_skb_any(skb);
464 usbnet_skb_return(dev, skb);
468 netif_dbg(dev, rx_err, dev->net, "drop\n");
469 dev->net->stats.rx_errors++;
471 skb_queue_tail(&dev->done, skb);
474 /*-------------------------------------------------------------------------*/
476 static void rx_complete (struct urb *urb)
478 struct sk_buff *skb = (struct sk_buff *) urb->context;
479 struct skb_data *entry = (struct skb_data *) skb->cb;
480 struct usbnet *dev = entry->dev;
481 int urb_status = urb->status;
482 enum skb_state state;
484 skb_put (skb, urb->actual_length);
488 switch (urb_status) {
491 if (skb->len < dev->net->hard_header_len) {
493 dev->net->stats.rx_errors++;
494 dev->net->stats.rx_length_errors++;
495 netif_dbg(dev, rx_err, dev->net,
496 "rx length %d\n", skb->len);
500 /* stalls need manual reset. this is rare ... except that
501 * when going through USB 2.0 TTs, unplug appears this way.
502 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
503 * storm, recovering as needed.
506 dev->net->stats.rx_errors++;
507 usbnet_defer_kevent (dev, EVENT_RX_HALT);
510 /* software-driven interface shutdown */
511 case -ECONNRESET: /* async unlink */
512 case -ESHUTDOWN: /* hardware gone */
513 netif_dbg(dev, ifdown, dev->net,
514 "rx shutdown, code %d\n", urb_status);
517 /* we get controller i/o faults during khubd disconnect() delays.
518 * throttle down resubmits, to avoid log floods; just temporarily,
519 * so we still recover when the fault isn't a khubd delay.
524 dev->net->stats.rx_errors++;
525 if (!timer_pending (&dev->delay)) {
526 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
527 netif_dbg(dev, link, dev->net,
528 "rx throttle %d\n", urb_status);
536 /* data overrun ... flush fifo? */
538 dev->net->stats.rx_over_errors++;
543 dev->net->stats.rx_errors++;
544 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
548 /* stop rx if packet error rate is high */
549 if (++dev->pkt_cnt > 30) {
553 if (state == rx_cleanup)
555 if (dev->pkt_err > 20)
556 set_bit(EVENT_RX_KILL, &dev->flags);
559 state = defer_bh(dev, skb, &dev->rxq, state);
562 if (netif_running (dev->net) &&
563 !test_bit (EVENT_RX_HALT, &dev->flags) &&
564 state != unlink_start) {
565 rx_submit (dev, urb, GFP_ATOMIC);
566 usb_mark_last_busy(dev->udev);
571 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
574 /*-------------------------------------------------------------------------*/
575 void usbnet_pause_rx(struct usbnet *dev)
577 set_bit(EVENT_RX_PAUSED, &dev->flags);
579 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
581 EXPORT_SYMBOL_GPL(usbnet_pause_rx);
583 void usbnet_resume_rx(struct usbnet *dev)
588 clear_bit(EVENT_RX_PAUSED, &dev->flags);
590 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
591 usbnet_skb_return(dev, skb);
595 tasklet_schedule(&dev->bh);
597 netif_dbg(dev, rx_status, dev->net,
598 "paused rx queue disabled, %d skbs requeued\n", num);
600 EXPORT_SYMBOL_GPL(usbnet_resume_rx);
602 void usbnet_purge_paused_rxq(struct usbnet *dev)
604 skb_queue_purge(&dev->rxq_pause);
606 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
608 /*-------------------------------------------------------------------------*/
610 // unlink pending rx/tx; completion handlers do all other cleanup
612 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
618 spin_lock_irqsave (&q->lock, flags);
619 while (!skb_queue_empty(q)) {
620 struct skb_data *entry;
624 skb_queue_walk(q, skb) {
625 entry = (struct skb_data *) skb->cb;
626 if (entry->state != unlink_start)
631 entry->state = unlink_start;
635 * Get reference count of the URB to avoid it to be
636 * freed during usb_unlink_urb, which may trigger
637 * use-after-free problem inside usb_unlink_urb since
638 * usb_unlink_urb is always racing with .complete
639 * handler(include defer_bh).
642 spin_unlock_irqrestore(&q->lock, flags);
643 // during some PM-driven resume scenarios,
644 // these (async) unlinks complete immediately
645 retval = usb_unlink_urb (urb);
646 if (retval != -EINPROGRESS && retval != 0)
647 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
651 spin_lock_irqsave(&q->lock, flags);
653 spin_unlock_irqrestore (&q->lock, flags);
657 // Flush all pending rx urbs
658 // minidrivers may need to do this when the MTU changes
660 void usbnet_unlink_rx_urbs(struct usbnet *dev)
662 if (netif_running(dev->net)) {
663 (void) unlink_urbs (dev, &dev->rxq);
664 tasklet_schedule(&dev->bh);
667 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
669 /*-------------------------------------------------------------------------*/
671 // precondition: never called in_interrupt
672 static void usbnet_terminate_urbs(struct usbnet *dev)
674 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(unlink_wakeup);
675 DECLARE_WAITQUEUE(wait, current);
678 /* ensure there are no more active urbs */
679 add_wait_queue(&unlink_wakeup, &wait);
680 set_current_state(TASK_UNINTERRUPTIBLE);
681 dev->wait = &unlink_wakeup;
682 temp = unlink_urbs(dev, &dev->txq) +
683 unlink_urbs(dev, &dev->rxq);
685 /* maybe wait for deletions to finish. */
686 while (!skb_queue_empty(&dev->rxq)
687 && !skb_queue_empty(&dev->txq)
688 && !skb_queue_empty(&dev->done)) {
689 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
690 set_current_state(TASK_UNINTERRUPTIBLE);
691 netif_dbg(dev, ifdown, dev->net,
692 "waited for %d urb completions\n", temp);
694 set_current_state(TASK_RUNNING);
696 remove_wait_queue(&unlink_wakeup, &wait);
699 int usbnet_stop (struct net_device *net)
701 struct usbnet *dev = netdev_priv(net);
702 struct driver_info *info = dev->driver_info;
705 clear_bit(EVENT_DEV_OPEN, &dev->flags);
706 netif_stop_queue (net);
708 netif_info(dev, ifdown, dev->net,
709 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
710 net->stats.rx_packets, net->stats.tx_packets,
711 net->stats.rx_errors, net->stats.tx_errors);
713 /* allow minidriver to stop correctly (wireless devices to turn off
716 retval = info->stop(dev);
718 netif_info(dev, ifdown, dev->net,
719 "stop fail (%d) usbnet usb-%s-%s, %s\n",
721 dev->udev->bus->bus_name, dev->udev->devpath,
725 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
726 usbnet_terminate_urbs(dev);
728 usb_kill_urb(dev->interrupt);
730 usbnet_purge_paused_rxq(dev);
732 /* deferred work (task, timer, softirq) must also stop.
733 * can't flush_scheduled_work() until we drop rtnl (later),
734 * else workers could deadlock; so make workers a NOP.
737 del_timer_sync (&dev->delay);
738 tasklet_kill (&dev->bh);
739 if (info->manage_power &&
740 !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags))
741 info->manage_power(dev, 0);
743 usb_autopm_put_interface(dev->intf);
747 EXPORT_SYMBOL_GPL(usbnet_stop);
749 /*-------------------------------------------------------------------------*/
751 // posts reads, and enables write queuing
753 // precondition: never called in_interrupt
755 int usbnet_open (struct net_device *net)
757 struct usbnet *dev = netdev_priv(net);
759 struct driver_info *info = dev->driver_info;
761 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
762 netif_info(dev, ifup, dev->net,
763 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
765 dev->udev->bus->bus_name,
771 // put into "known safe" state
772 if (info->reset && (retval = info->reset (dev)) < 0) {
773 netif_info(dev, ifup, dev->net,
774 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
776 dev->udev->bus->bus_name,
782 // insist peer be connected
783 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
784 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
788 /* start any status interrupt transfer */
789 if (dev->interrupt) {
790 retval = usb_submit_urb (dev->interrupt, GFP_KERNEL);
792 netif_err(dev, ifup, dev->net,
793 "intr submit %d\n", retval);
798 set_bit(EVENT_DEV_OPEN, &dev->flags);
799 netif_start_queue (net);
800 netif_info(dev, ifup, dev->net,
801 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
802 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
804 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
805 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
806 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
807 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
808 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
811 /* reset rx error state */
814 clear_bit(EVENT_RX_KILL, &dev->flags);
816 // delay posting reads until we're fully open
817 tasklet_schedule (&dev->bh);
818 if (info->manage_power) {
819 retval = info->manage_power(dev, 1);
822 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
824 usb_autopm_put_interface(dev->intf);
829 usb_autopm_put_interface(dev->intf);
833 EXPORT_SYMBOL_GPL(usbnet_open);
835 /*-------------------------------------------------------------------------*/
837 /* ethtool methods; minidrivers may need to add some more, but
838 * they'll probably want to use this base set.
841 int usbnet_get_settings (struct net_device *net, struct ethtool_cmd *cmd)
843 struct usbnet *dev = netdev_priv(net);
845 if (!dev->mii.mdio_read)
848 return mii_ethtool_gset(&dev->mii, cmd);
850 EXPORT_SYMBOL_GPL(usbnet_get_settings);
852 int usbnet_set_settings (struct net_device *net, struct ethtool_cmd *cmd)
854 struct usbnet *dev = netdev_priv(net);
857 if (!dev->mii.mdio_write)
860 retval = mii_ethtool_sset(&dev->mii, cmd);
862 /* link speed/duplex might have changed */
863 if (dev->driver_info->link_reset)
864 dev->driver_info->link_reset(dev);
869 EXPORT_SYMBOL_GPL(usbnet_set_settings);
871 u32 usbnet_get_link (struct net_device *net)
873 struct usbnet *dev = netdev_priv(net);
875 /* If a check_connect is defined, return its result */
876 if (dev->driver_info->check_connect)
877 return dev->driver_info->check_connect (dev) == 0;
879 /* if the device has mii operations, use those */
880 if (dev->mii.mdio_read)
881 return mii_link_ok(&dev->mii);
883 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
884 return ethtool_op_get_link(net);
886 EXPORT_SYMBOL_GPL(usbnet_get_link);
888 int usbnet_nway_reset(struct net_device *net)
890 struct usbnet *dev = netdev_priv(net);
892 if (!dev->mii.mdio_write)
895 return mii_nway_restart(&dev->mii);
897 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
899 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
901 struct usbnet *dev = netdev_priv(net);
903 strlcpy (info->driver, dev->driver_name, sizeof info->driver);
904 strlcpy (info->version, DRIVER_VERSION, sizeof info->version);
905 strlcpy (info->fw_version, dev->driver_info->description,
906 sizeof info->fw_version);
907 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
909 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
911 u32 usbnet_get_msglevel (struct net_device *net)
913 struct usbnet *dev = netdev_priv(net);
915 return dev->msg_enable;
917 EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
919 void usbnet_set_msglevel (struct net_device *net, u32 level)
921 struct usbnet *dev = netdev_priv(net);
923 dev->msg_enable = level;
925 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
927 /* drivers may override default ethtool_ops in their bind() routine */
928 static const struct ethtool_ops usbnet_ethtool_ops = {
929 .get_settings = usbnet_get_settings,
930 .set_settings = usbnet_set_settings,
931 .get_link = usbnet_get_link,
932 .nway_reset = usbnet_nway_reset,
933 .get_drvinfo = usbnet_get_drvinfo,
934 .get_msglevel = usbnet_get_msglevel,
935 .set_msglevel = usbnet_set_msglevel,
936 .get_ts_info = ethtool_op_get_ts_info,
939 /*-------------------------------------------------------------------------*/
941 static void __handle_link_change(struct usbnet *dev)
943 if (!test_bit(EVENT_DEV_OPEN, &dev->flags))
946 if (!netif_carrier_ok(dev->net)) {
947 /* kill URBs for reading packets to save bus bandwidth */
948 unlink_urbs(dev, &dev->rxq);
951 * tx_timeout will unlink URBs for sending packets and
952 * tx queue is stopped by netcore after link becomes off
955 /* submitting URBs for reading packets */
956 tasklet_schedule(&dev->bh);
959 clear_bit(EVENT_LINK_CHANGE, &dev->flags);
962 /* work that cannot be done in interrupt context uses keventd.
964 * NOTE: with 2.5 we could do more of this using completion callbacks,
965 * especially now that control transfers can be queued.
968 kevent (struct work_struct *work)
971 container_of(work, struct usbnet, kevent);
974 /* usb_clear_halt() needs a thread context */
975 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
976 unlink_urbs (dev, &dev->txq);
977 status = usb_autopm_get_interface(dev->intf);
980 status = usb_clear_halt (dev->udev, dev->out);
981 usb_autopm_put_interface(dev->intf);
984 status != -ESHUTDOWN) {
985 if (netif_msg_tx_err (dev))
987 netdev_err(dev->net, "can't clear tx halt, status %d\n",
990 clear_bit (EVENT_TX_HALT, &dev->flags);
991 if (status != -ESHUTDOWN)
992 netif_wake_queue (dev->net);
995 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
996 unlink_urbs (dev, &dev->rxq);
997 status = usb_autopm_get_interface(dev->intf);
1000 status = usb_clear_halt (dev->udev, dev->in);
1001 usb_autopm_put_interface(dev->intf);
1004 status != -ESHUTDOWN) {
1005 if (netif_msg_rx_err (dev))
1007 netdev_err(dev->net, "can't clear rx halt, status %d\n",
1010 clear_bit (EVENT_RX_HALT, &dev->flags);
1011 tasklet_schedule (&dev->bh);
1015 /* tasklet could resubmit itself forever if memory is tight */
1016 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
1017 struct urb *urb = NULL;
1020 if (netif_running (dev->net))
1021 urb = usb_alloc_urb (0, GFP_KERNEL);
1023 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1025 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1026 status = usb_autopm_get_interface(dev->intf);
1031 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
1033 usb_autopm_put_interface(dev->intf);
1036 tasklet_schedule (&dev->bh);
1040 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
1041 struct driver_info *info = dev->driver_info;
1044 clear_bit (EVENT_LINK_RESET, &dev->flags);
1045 status = usb_autopm_get_interface(dev->intf);
1048 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
1049 usb_autopm_put_interface(dev->intf);
1051 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
1053 dev->udev->bus->bus_name,
1057 usb_autopm_put_interface(dev->intf);
1060 /* handle link change from link resetting */
1061 __handle_link_change(dev);
1064 if (test_bit (EVENT_LINK_CHANGE, &dev->flags))
1065 __handle_link_change(dev);
1068 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
1071 /*-------------------------------------------------------------------------*/
1073 static void tx_complete (struct urb *urb)
1075 struct sk_buff *skb = (struct sk_buff *) urb->context;
1076 struct skb_data *entry = (struct skb_data *) skb->cb;
1077 struct usbnet *dev = entry->dev;
1079 if (urb->status == 0) {
1080 if (!(dev->driver_info->flags & FLAG_MULTI_PACKET))
1081 dev->net->stats.tx_packets++;
1082 dev->net->stats.tx_bytes += entry->length;
1084 dev->net->stats.tx_errors++;
1086 switch (urb->status) {
1088 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1091 /* software-driven interface shutdown */
1092 case -ECONNRESET: // async unlink
1093 case -ESHUTDOWN: // hardware gone
1096 // like rx, tx gets controller i/o faults during khubd delays
1097 // and so it uses the same throttling mechanism.
1101 usb_mark_last_busy(dev->udev);
1102 if (!timer_pending (&dev->delay)) {
1103 mod_timer (&dev->delay,
1104 jiffies + THROTTLE_JIFFIES);
1105 netif_dbg(dev, link, dev->net,
1106 "tx throttle %d\n", urb->status);
1108 netif_stop_queue (dev->net);
1111 netif_dbg(dev, tx_err, dev->net,
1112 "tx err %d\n", entry->urb->status);
1117 usb_autopm_put_interface_async(dev->intf);
1118 (void) defer_bh(dev, skb, &dev->txq, tx_done);
1121 /*-------------------------------------------------------------------------*/
1123 void usbnet_tx_timeout (struct net_device *net)
1125 struct usbnet *dev = netdev_priv(net);
1127 unlink_urbs (dev, &dev->txq);
1128 tasklet_schedule (&dev->bh);
1130 // FIXME: device recovery -- reset?
1132 EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
1134 /*-------------------------------------------------------------------------*/
1136 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1137 struct net_device *net)
1139 struct usbnet *dev = netdev_priv(net);
1141 struct urb *urb = NULL;
1142 struct skb_data *entry;
1143 struct driver_info *info = dev->driver_info;
1144 unsigned long flags;
1148 skb_tx_timestamp(skb);
1150 // some devices want funky USB-level framing, for
1151 // win32 driver (usually) and/or hardware quirks
1152 if (info->tx_fixup) {
1153 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1155 /* packet collected; minidriver waiting for more */
1156 if (info->flags & FLAG_MULTI_PACKET)
1158 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1164 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1165 netif_dbg(dev, tx_err, dev->net, "no urb\n");
1169 entry = (struct skb_data *) skb->cb;
1172 entry->length = length;
1174 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1175 skb->data, skb->len, tx_complete, skb);
1177 /* don't assume the hardware handles USB_ZERO_PACKET
1178 * NOTE: strictly conforming cdc-ether devices should expect
1179 * the ZLP here, but ignore the one-byte packet.
1180 * NOTE2: CDC NCM specification is different from CDC ECM when
1181 * handling ZLP/short packets, so cdc_ncm driver will make short
1182 * packet itself if needed.
1184 if (length % dev->maxpacket == 0) {
1185 if (!(info->flags & FLAG_SEND_ZLP)) {
1186 if (!(info->flags & FLAG_MULTI_PACKET)) {
1187 urb->transfer_buffer_length++;
1188 if (skb_tailroom(skb)) {
1189 skb->data[skb->len] = 0;
1194 urb->transfer_flags |= URB_ZERO_PACKET;
1197 spin_lock_irqsave(&dev->txq.lock, flags);
1198 retval = usb_autopm_get_interface_async(dev->intf);
1200 spin_unlock_irqrestore(&dev->txq.lock, flags);
1205 /* if this triggers the device is still a sleep */
1206 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1207 /* transmission will be done in resume */
1208 usb_anchor_urb(urb, &dev->deferred);
1209 /* no use to process more packets */
1210 netif_stop_queue(net);
1212 spin_unlock_irqrestore(&dev->txq.lock, flags);
1213 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
1218 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1220 netif_stop_queue (net);
1221 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1222 usb_autopm_put_interface_async(dev->intf);
1225 usb_autopm_put_interface_async(dev->intf);
1226 netif_dbg(dev, tx_err, dev->net,
1227 "tx: submit urb err %d\n", retval);
1230 net->trans_start = jiffies;
1231 __usbnet_queue_skb(&dev->txq, skb, tx_start);
1232 if (dev->txq.qlen >= TX_QLEN (dev))
1233 netif_stop_queue (net);
1235 spin_unlock_irqrestore (&dev->txq.lock, flags);
1238 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
1240 dev->net->stats.tx_dropped++;
1243 dev_kfree_skb_any (skb);
1246 netif_dbg(dev, tx_queued, dev->net,
1247 "> tx, len %d, type 0x%x\n", length, skb->protocol);
1251 return NETDEV_TX_OK;
1253 EXPORT_SYMBOL_GPL(usbnet_start_xmit);
1255 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags)
1261 /* don't refill the queue all at once */
1262 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) {
1263 urb = usb_alloc_urb(0, flags);
1265 ret = rx_submit(dev, urb, flags);
1277 /*-------------------------------------------------------------------------*/
1279 // tasklet (work deferred from completions, in_irq) or timer
1281 static void usbnet_bh (unsigned long param)
1283 struct usbnet *dev = (struct usbnet *) param;
1284 struct sk_buff *skb;
1285 struct skb_data *entry;
1287 while ((skb = skb_dequeue (&dev->done))) {
1288 entry = (struct skb_data *) skb->cb;
1289 switch (entry->state) {
1291 entry->state = rx_cleanup;
1292 rx_process (dev, skb);
1296 usb_free_urb (entry->urb);
1297 dev_kfree_skb (skb);
1300 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
1304 /* restart RX again after disabling due to high error rate */
1305 clear_bit(EVENT_RX_KILL, &dev->flags);
1307 // waiting for all pending urbs to complete?
1309 if ((dev->txq.qlen + dev->rxq.qlen + dev->done.qlen) == 0) {
1310 wake_up (dev->wait);
1313 // or are we maybe short a few urbs?
1314 } else if (netif_running (dev->net) &&
1315 netif_device_present (dev->net) &&
1316 netif_carrier_ok(dev->net) &&
1317 !timer_pending (&dev->delay) &&
1318 !test_bit (EVENT_RX_HALT, &dev->flags)) {
1319 int temp = dev->rxq.qlen;
1321 if (temp < RX_QLEN(dev)) {
1322 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK)
1324 if (temp != dev->rxq.qlen)
1325 netif_dbg(dev, link, dev->net,
1326 "rxqlen %d --> %d\n",
1327 temp, dev->rxq.qlen);
1328 if (dev->rxq.qlen < RX_QLEN(dev))
1329 tasklet_schedule (&dev->bh);
1331 if (dev->txq.qlen < TX_QLEN (dev))
1332 netif_wake_queue (dev->net);
1337 /*-------------------------------------------------------------------------
1339 * USB Device Driver support
1341 *-------------------------------------------------------------------------*/
1343 // precondition: never called in_interrupt
1345 void usbnet_disconnect (struct usb_interface *intf)
1348 struct usb_device *xdev;
1349 struct net_device *net;
1351 dev = usb_get_intfdata(intf);
1352 usb_set_intfdata(intf, NULL);
1356 xdev = interface_to_usbdev (intf);
1358 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1359 intf->dev.driver->name,
1360 xdev->bus->bus_name, xdev->devpath,
1361 dev->driver_info->description);
1364 unregister_netdev (net);
1366 cancel_work_sync(&dev->kevent);
1368 usb_scuttle_anchored_urbs(&dev->deferred);
1370 if (dev->driver_info->unbind)
1371 dev->driver_info->unbind (dev, intf);
1373 usb_kill_urb(dev->interrupt);
1374 usb_free_urb(dev->interrupt);
1378 EXPORT_SYMBOL_GPL(usbnet_disconnect);
1380 static const struct net_device_ops usbnet_netdev_ops = {
1381 .ndo_open = usbnet_open,
1382 .ndo_stop = usbnet_stop,
1383 .ndo_start_xmit = usbnet_start_xmit,
1384 .ndo_tx_timeout = usbnet_tx_timeout,
1385 .ndo_change_mtu = usbnet_change_mtu,
1386 .ndo_set_mac_address = eth_mac_addr,
1387 .ndo_validate_addr = eth_validate_addr,
1390 /*-------------------------------------------------------------------------*/
1392 // precondition: never called in_interrupt
1394 static struct device_type wlan_type = {
1398 static struct device_type wwan_type = {
1403 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1406 struct net_device *net;
1407 struct usb_host_interface *interface;
1408 struct driver_info *info;
1409 struct usb_device *xdev;
1412 struct usb_driver *driver = to_usb_driver(udev->dev.driver);
1414 /* usbnet already took usb runtime pm, so have to enable the feature
1415 * for usb interface, otherwise usb_autopm_get_interface may return
1416 * failure if USB_SUSPEND(RUNTIME_PM) is enabled.
1418 if (!driver->supports_autosuspend) {
1419 driver->supports_autosuspend = 1;
1420 pm_runtime_enable(&udev->dev);
1423 name = udev->dev.driver->name;
1424 info = (struct driver_info *) prod->driver_info;
1426 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1429 xdev = interface_to_usbdev (udev);
1430 interface = udev->cur_altsetting;
1434 // set up our own records
1435 net = alloc_etherdev(sizeof(*dev));
1439 /* netdev_printk() needs this so do it as early as possible */
1440 SET_NETDEV_DEV(net, &udev->dev);
1442 dev = netdev_priv(net);
1445 dev->driver_info = info;
1446 dev->driver_name = name;
1447 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1448 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1449 skb_queue_head_init (&dev->rxq);
1450 skb_queue_head_init (&dev->txq);
1451 skb_queue_head_init (&dev->done);
1452 skb_queue_head_init(&dev->rxq_pause);
1453 dev->bh.func = usbnet_bh;
1454 dev->bh.data = (unsigned long) dev;
1455 INIT_WORK (&dev->kevent, kevent);
1456 init_usb_anchor(&dev->deferred);
1457 dev->delay.function = usbnet_bh;
1458 dev->delay.data = (unsigned long) dev;
1459 init_timer (&dev->delay);
1460 mutex_init (&dev->phy_mutex);
1463 strcpy (net->name, "usb%d");
1464 memcpy (net->dev_addr, node_id, sizeof node_id);
1466 /* rx and tx sides can use different message sizes;
1467 * bind() should set rx_urb_size in that case.
1469 dev->hard_mtu = net->mtu + net->hard_header_len;
1471 // dma_supported() is deeply broken on almost all architectures
1472 // possible with some EHCI controllers
1473 if (dma_supported (&udev->dev, DMA_BIT_MASK(64)))
1474 net->features |= NETIF_F_HIGHDMA;
1477 net->netdev_ops = &usbnet_netdev_ops;
1478 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1479 net->ethtool_ops = &usbnet_ethtool_ops;
1481 // allow device-specific bind/init procedures
1482 // NOTE net->name still not usable ...
1484 status = info->bind (dev, udev);
1488 // heuristic: "usb%d" for links we know are two-host,
1489 // else "eth%d" when there's reasonable doubt. userspace
1490 // can rename the link if it knows better.
1491 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
1492 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 ||
1493 (net->dev_addr [0] & 0x02) == 0))
1494 strcpy (net->name, "eth%d");
1495 /* WLAN devices should always be named "wlan%d" */
1496 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1497 strcpy(net->name, "wlan%d");
1498 /* WWAN devices should always be named "wwan%d" */
1499 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1500 strcpy(net->name, "wwan%d");
1502 /* devices that cannot do ARP */
1503 if ((dev->driver_info->flags & FLAG_NOARP) != 0)
1504 net->flags |= IFF_NOARP;
1506 /* maybe the remote can't receive an Ethernet MTU */
1507 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1508 net->mtu = dev->hard_mtu - net->hard_header_len;
1509 } else if (!info->in || !info->out)
1510 status = usbnet_get_endpoints (dev, udev);
1512 dev->in = usb_rcvbulkpipe (xdev, info->in);
1513 dev->out = usb_sndbulkpipe (xdev, info->out);
1514 if (!(info->flags & FLAG_NO_SETINT))
1515 status = usb_set_interface (xdev,
1516 interface->desc.bInterfaceNumber,
1517 interface->desc.bAlternateSetting);
1522 if (status >= 0 && dev->status)
1523 status = init_status (dev, udev);
1527 if (!dev->rx_urb_size)
1528 dev->rx_urb_size = dev->hard_mtu;
1529 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1531 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1532 SET_NETDEV_DEVTYPE(net, &wlan_type);
1533 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1534 SET_NETDEV_DEVTYPE(net, &wwan_type);
1536 status = register_netdev (net);
1539 netif_info(dev, probe, dev->net,
1540 "register '%s' at usb-%s-%s, %s, %pM\n",
1541 udev->dev.driver->name,
1542 xdev->bus->bus_name, xdev->devpath,
1543 dev->driver_info->description,
1546 // ok, it's ready to go.
1547 usb_set_intfdata (udev, dev);
1549 netif_device_attach (net);
1551 if (dev->driver_info->flags & FLAG_LINK_INTR)
1552 usbnet_link_change(dev, 0, 0);
1557 usb_free_urb(dev->interrupt);
1560 info->unbind (dev, udev);
1566 EXPORT_SYMBOL_GPL(usbnet_probe);
1568 /*-------------------------------------------------------------------------*/
1571 * suspend the whole driver as soon as the first interface is suspended
1572 * resume only when the last interface is resumed
1575 int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1577 struct usbnet *dev = usb_get_intfdata(intf);
1579 if (!dev->suspend_count++) {
1580 spin_lock_irq(&dev->txq.lock);
1581 /* don't autosuspend while transmitting */
1582 if (dev->txq.qlen && PMSG_IS_AUTO(message)) {
1583 dev->suspend_count--;
1584 spin_unlock_irq(&dev->txq.lock);
1587 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1588 spin_unlock_irq(&dev->txq.lock);
1591 * accelerate emptying of the rx and queues, to avoid
1592 * having everything error out.
1594 netif_device_detach (dev->net);
1595 usbnet_terminate_urbs(dev);
1596 usb_kill_urb(dev->interrupt);
1599 * reattach so runtime management can use and
1602 netif_device_attach (dev->net);
1606 EXPORT_SYMBOL_GPL(usbnet_suspend);
1608 int usbnet_resume (struct usb_interface *intf)
1610 struct usbnet *dev = usb_get_intfdata(intf);
1611 struct sk_buff *skb;
1615 if (!--dev->suspend_count) {
1616 /* resume interrupt URBs */
1617 if (dev->interrupt && test_bit(EVENT_DEV_OPEN, &dev->flags))
1618 usb_submit_urb(dev->interrupt, GFP_NOIO);
1620 spin_lock_irq(&dev->txq.lock);
1621 while ((res = usb_get_from_anchor(&dev->deferred))) {
1623 skb = (struct sk_buff *)res->context;
1624 retval = usb_submit_urb(res, GFP_ATOMIC);
1626 dev_kfree_skb_any(skb);
1628 usb_autopm_put_interface_async(dev->intf);
1630 dev->net->trans_start = jiffies;
1631 __skb_queue_tail(&dev->txq, skb);
1636 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1637 spin_unlock_irq(&dev->txq.lock);
1639 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) {
1640 /* handle remote wakeup ASAP */
1642 netif_device_present(dev->net) &&
1643 !timer_pending(&dev->delay) &&
1644 !test_bit(EVENT_RX_HALT, &dev->flags))
1645 rx_alloc_submit(dev, GFP_NOIO);
1647 if (!(dev->txq.qlen >= TX_QLEN(dev)))
1648 netif_tx_wake_all_queues(dev->net);
1649 tasklet_schedule (&dev->bh);
1653 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags))
1654 usb_autopm_get_interface_no_resume(intf);
1658 EXPORT_SYMBOL_GPL(usbnet_resume);
1661 * Either a subdriver implements manage_power, then it is assumed to always
1662 * be ready to be suspended or it reports the readiness to be suspended
1665 void usbnet_device_suggests_idle(struct usbnet *dev)
1667 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) {
1668 dev->intf->needs_remote_wakeup = 1;
1669 usb_autopm_put_interface_async(dev->intf);
1672 EXPORT_SYMBOL(usbnet_device_suggests_idle);
1675 * For devices that can do without special commands
1677 int usbnet_manage_power(struct usbnet *dev, int on)
1679 dev->intf->needs_remote_wakeup = on;
1682 EXPORT_SYMBOL(usbnet_manage_power);
1684 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset)
1686 /* update link after link is reseted */
1687 if (link && !need_reset)
1688 netif_carrier_on(dev->net);
1690 netif_carrier_off(dev->net);
1692 if (need_reset && link)
1693 usbnet_defer_kevent(dev, EVENT_LINK_RESET);
1695 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
1697 EXPORT_SYMBOL(usbnet_link_change);
1699 /*-------------------------------------------------------------------------*/
1700 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1701 u16 value, u16 index, void *data, u16 size)
1706 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x"
1707 " value=0x%04x index=0x%04x size=%d\n",
1708 cmd, reqtype, value, index, size);
1711 buf = kmalloc(size, GFP_KERNEL);
1716 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
1717 cmd, reqtype, value, index, buf, size,
1718 USB_CTRL_GET_TIMEOUT);
1719 if (err > 0 && err <= size)
1720 memcpy(data, buf, err);
1726 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1727 u16 value, u16 index, const void *data,
1733 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
1734 " value=0x%04x index=0x%04x size=%d\n",
1735 cmd, reqtype, value, index, size);
1738 buf = kmemdup(data, size, GFP_KERNEL);
1743 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
1744 cmd, reqtype, value, index, buf, size,
1745 USB_CTRL_SET_TIMEOUT);
1753 * The function can't be called inside suspend/resume callback,
1754 * otherwise deadlock will be caused.
1756 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1757 u16 value, u16 index, void *data, u16 size)
1761 if (usb_autopm_get_interface(dev->intf) < 0)
1763 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index,
1765 usb_autopm_put_interface(dev->intf);
1768 EXPORT_SYMBOL_GPL(usbnet_read_cmd);
1771 * The function can't be called inside suspend/resume callback,
1772 * otherwise deadlock will be caused.
1774 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1775 u16 value, u16 index, const void *data, u16 size)
1779 if (usb_autopm_get_interface(dev->intf) < 0)
1781 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index,
1783 usb_autopm_put_interface(dev->intf);
1786 EXPORT_SYMBOL_GPL(usbnet_write_cmd);
1789 * The function can be called inside suspend/resume callback safely
1790 * and should only be called by suspend/resume callback generally.
1792 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
1793 u16 value, u16 index, void *data, u16 size)
1795 return __usbnet_read_cmd(dev, cmd, reqtype, value, index,
1798 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm);
1801 * The function can be called inside suspend/resume callback safely
1802 * and should only be called by suspend/resume callback generally.
1804 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
1805 u16 value, u16 index, const void *data,
1808 return __usbnet_write_cmd(dev, cmd, reqtype, value, index,
1811 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm);
1813 static void usbnet_async_cmd_cb(struct urb *urb)
1815 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;
1816 int status = urb->status;
1819 dev_dbg(&urb->dev->dev, "%s failed with %d",
1827 * The caller must make sure that device can't be put into suspend
1828 * state until the control URB completes.
1830 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,
1831 u16 value, u16 index, const void *data, u16 size)
1833 struct usb_ctrlrequest *req = NULL;
1838 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
1839 " value=0x%04x index=0x%04x size=%d\n",
1840 cmd, reqtype, value, index, size);
1842 urb = usb_alloc_urb(0, GFP_ATOMIC);
1844 netdev_err(dev->net, "Error allocating URB in"
1845 " %s!\n", __func__);
1850 buf = kmemdup(data, size, GFP_ATOMIC);
1852 netdev_err(dev->net, "Error allocating buffer"
1853 " in %s!\n", __func__);
1858 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
1862 req->bRequestType = reqtype;
1863 req->bRequest = cmd;
1864 req->wValue = cpu_to_le16(value);
1865 req->wIndex = cpu_to_le16(index);
1866 req->wLength = cpu_to_le16(size);
1868 usb_fill_control_urb(urb, dev->udev,
1869 usb_sndctrlpipe(dev->udev, 0),
1870 (void *)req, buf, size,
1871 usbnet_async_cmd_cb, req);
1872 urb->transfer_flags |= URB_FREE_BUFFER;
1874 err = usb_submit_urb(urb, GFP_ATOMIC);
1876 netdev_err(dev->net, "Error submitting the control"
1877 " message: status=%d\n", err);
1891 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async);
1892 /*-------------------------------------------------------------------------*/
1894 static int __init usbnet_init(void)
1896 /* Compiler should optimize this out. */
1898 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data));
1900 eth_random_addr(node_id);
1903 module_init(usbnet_init);
1905 static void __exit usbnet_exit(void)
1908 module_exit(usbnet_exit);
1910 MODULE_AUTHOR("David Brownell");
1911 MODULE_DESCRIPTION("USB network driver framework");
1912 MODULE_LICENSE("GPL");