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, see <http://www.gnu.org/licenses/>.
21 * This is a generic "USB networking" framework that works with several
22 * kinds of full and high speed networking devices: host-to-host cables,
23 * smart usb peripherals, and actual Ethernet adapters.
25 * These devices usually differ in terms of control protocols (if they
26 * even have one!) and sometimes they define new framing to wrap or batch
27 * Ethernet packets. Otherwise, they talk to USB pretty much the same,
28 * so interface (un)binding, endpoint I/O queues, fault handling, and other
29 * issues can usefully be addressed by this framework.
32 // #define DEBUG // error path messages, extra info
33 // #define VERBOSE // more; success messages
35 #include <linux/module.h>
36 #include <linux/init.h>
37 #include <linux/netdevice.h>
38 #include <linux/etherdevice.h>
39 #include <linux/ctype.h>
40 #include <linux/ethtool.h>
41 #include <linux/workqueue.h>
42 #include <linux/mii.h>
43 #include <linux/usb.h>
44 #include <linux/usb/usbnet.h>
45 #include <linux/slab.h>
46 #include <linux/kernel.h>
47 #include <linux/pm_runtime.h>
49 #define DRIVER_VERSION "22-Aug-2005"
52 /*-------------------------------------------------------------------------*/
55 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max.
56 * Several dozen bytes of IPv4 data can fit in two such transactions.
57 * One maximum size Ethernet packet takes twenty four of them.
58 * For high speed, each frame comfortably fits almost 36 max size
59 * Ethernet packets (so queues should be bigger).
61 * The goal is to let the USB host controller be busy for 5msec or
62 * more before an irq is required, under load. Jumbograms change
65 #define MAX_QUEUE_MEMORY (60 * 1518)
66 #define RX_QLEN(dev) ((dev)->rx_qlen)
67 #define TX_QLEN(dev) ((dev)->tx_qlen)
69 // reawaken network queue this soon after stopping; else watchdog barks
70 #define TX_TIMEOUT_JIFFIES (5*HZ)
72 /* throttle rx/tx briefly after some faults, so hub_wq might disconnect()
73 * us (it polls at HZ/4 usually) before we report too many false errors.
75 #define THROTTLE_JIFFIES (HZ/8)
78 #define UNLINK_TIMEOUT_MS 3
80 /*-------------------------------------------------------------------------*/
82 // randomly generated ethernet address
83 static u8 node_id [ETH_ALEN];
85 /* use ethtool to change the level for any given device */
86 static int msg_level = -1;
87 module_param (msg_level, int, 0);
88 MODULE_PARM_DESC (msg_level, "Override default message level");
90 /*-------------------------------------------------------------------------*/
92 /* handles CDC Ethernet and many other network "bulk data" interfaces */
93 int usbnet_get_endpoints(struct usbnet *dev, struct usb_interface *intf)
96 struct usb_host_interface *alt = NULL;
97 struct usb_host_endpoint *in = NULL, *out = NULL;
98 struct usb_host_endpoint *status = NULL;
100 for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
103 in = out = status = NULL;
104 alt = intf->altsetting + tmp;
106 /* take the first altsetting with in-bulk + out-bulk;
107 * remember any status endpoint, just in case;
108 * ignore other endpoints and altsettings.
110 for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
111 struct usb_host_endpoint *e;
114 e = alt->endpoint + ep;
115 switch (e->desc.bmAttributes) {
116 case USB_ENDPOINT_XFER_INT:
117 if (!usb_endpoint_dir_in(&e->desc))
121 case USB_ENDPOINT_XFER_BULK:
126 if (usb_endpoint_dir_in(&e->desc)) {
129 else if (intr && !status)
139 if (!alt || !in || !out)
142 if (alt->desc.bAlternateSetting != 0 ||
143 !(dev->driver_info->flags & FLAG_NO_SETINT)) {
144 tmp = usb_set_interface (dev->udev, alt->desc.bInterfaceNumber,
145 alt->desc.bAlternateSetting);
150 dev->in = usb_rcvbulkpipe (dev->udev,
151 in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
152 dev->out = usb_sndbulkpipe (dev->udev,
153 out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
154 dev->status = status;
157 EXPORT_SYMBOL_GPL(usbnet_get_endpoints);
159 int usbnet_get_ethernet_addr(struct usbnet *dev, int iMACAddress)
162 unsigned char buf [13];
164 ret = usb_string(dev->udev, iMACAddress, buf, sizeof buf);
166 tmp = hex2bin(dev->net->dev_addr, buf, 6);
168 dev_dbg(&dev->udev->dev,
169 "bad MAC string %d fetch, %d\n", iMACAddress, tmp);
176 EXPORT_SYMBOL_GPL(usbnet_get_ethernet_addr);
178 static void intr_complete (struct urb *urb)
180 struct usbnet *dev = urb->context;
181 int status = urb->status;
186 dev->driver_info->status(dev, urb);
189 /* software-driven interface shutdown */
190 case -ENOENT: /* urb killed */
191 case -ESHUTDOWN: /* hardware gone */
192 netif_dbg(dev, ifdown, dev->net,
193 "intr shutdown, code %d\n", status);
196 /* NOTE: not throttling like RX/TX, since this endpoint
197 * already polls infrequently
200 netdev_dbg(dev->net, "intr status %d\n", status);
204 status = usb_submit_urb (urb, GFP_ATOMIC);
206 netif_err(dev, timer, dev->net,
207 "intr resubmit --> %d\n", status);
210 static int init_status (struct usbnet *dev, struct usb_interface *intf)
217 if (!dev->driver_info->status)
220 pipe = usb_rcvintpipe (dev->udev,
221 dev->status->desc.bEndpointAddress
222 & USB_ENDPOINT_NUMBER_MASK);
223 maxp = usb_maxpacket (dev->udev, pipe, 0);
225 /* avoid 1 msec chatter: min 8 msec poll rate */
226 period = max ((int) dev->status->desc.bInterval,
227 (dev->udev->speed == USB_SPEED_HIGH) ? 7 : 3);
229 buf = kmalloc (maxp, GFP_KERNEL);
231 dev->interrupt = usb_alloc_urb (0, GFP_KERNEL);
232 if (!dev->interrupt) {
236 usb_fill_int_urb(dev->interrupt, dev->udev, pipe,
237 buf, maxp, intr_complete, dev, period);
238 dev->interrupt->transfer_flags |= URB_FREE_BUFFER;
240 "status ep%din, %d bytes period %d\n",
241 usb_pipeendpoint(pipe), maxp, period);
247 /* Submit the interrupt URB if not previously submitted, increasing refcount */
248 int usbnet_status_start(struct usbnet *dev, gfp_t mem_flags)
252 WARN_ON_ONCE(dev->interrupt == NULL);
253 if (dev->interrupt) {
254 mutex_lock(&dev->interrupt_mutex);
256 if (++dev->interrupt_count == 1)
257 ret = usb_submit_urb(dev->interrupt, mem_flags);
259 dev_dbg(&dev->udev->dev, "incremented interrupt URB count to %d\n",
260 dev->interrupt_count);
261 mutex_unlock(&dev->interrupt_mutex);
265 EXPORT_SYMBOL_GPL(usbnet_status_start);
267 /* For resume; submit interrupt URB if previously submitted */
268 static int __usbnet_status_start_force(struct usbnet *dev, gfp_t mem_flags)
272 mutex_lock(&dev->interrupt_mutex);
273 if (dev->interrupt_count) {
274 ret = usb_submit_urb(dev->interrupt, mem_flags);
275 dev_dbg(&dev->udev->dev,
276 "submitted interrupt URB for resume\n");
278 mutex_unlock(&dev->interrupt_mutex);
282 /* Kill the interrupt URB if all submitters want it killed */
283 void usbnet_status_stop(struct usbnet *dev)
285 if (dev->interrupt) {
286 mutex_lock(&dev->interrupt_mutex);
287 WARN_ON(dev->interrupt_count == 0);
289 if (dev->interrupt_count && --dev->interrupt_count == 0)
290 usb_kill_urb(dev->interrupt);
292 dev_dbg(&dev->udev->dev,
293 "decremented interrupt URB count to %d\n",
294 dev->interrupt_count);
295 mutex_unlock(&dev->interrupt_mutex);
298 EXPORT_SYMBOL_GPL(usbnet_status_stop);
300 /* For suspend; always kill interrupt URB */
301 static void __usbnet_status_stop_force(struct usbnet *dev)
303 if (dev->interrupt) {
304 mutex_lock(&dev->interrupt_mutex);
305 usb_kill_urb(dev->interrupt);
306 dev_dbg(&dev->udev->dev, "killed interrupt URB for suspend\n");
307 mutex_unlock(&dev->interrupt_mutex);
311 /* Passes this packet up the stack, updating its accounting.
312 * Some link protocols batch packets, so their rx_fixup paths
313 * can return clones as well as just modify the original skb.
315 void usbnet_skb_return (struct usbnet *dev, struct sk_buff *skb)
317 struct pcpu_sw_netstats *stats64 = this_cpu_ptr(dev->stats64);
320 if (test_bit(EVENT_RX_PAUSED, &dev->flags)) {
321 skb_queue_tail(&dev->rxq_pause, skb);
325 /* only update if unset to allow minidriver rx_fixup override */
326 if (skb->protocol == 0)
327 skb->protocol = eth_type_trans (skb, dev->net);
329 u64_stats_update_begin(&stats64->syncp);
330 stats64->rx_packets++;
331 stats64->rx_bytes += skb->len;
332 u64_stats_update_end(&stats64->syncp);
334 netif_dbg(dev, rx_status, dev->net, "< rx, len %zu, type 0x%x\n",
335 skb->len + sizeof (struct ethhdr), skb->protocol);
336 memset (skb->cb, 0, sizeof (struct skb_data));
338 if (skb_defer_rx_timestamp(skb))
341 status = netif_rx (skb);
342 if (status != NET_RX_SUCCESS)
343 netif_dbg(dev, rx_err, dev->net,
344 "netif_rx status %d\n", status);
346 EXPORT_SYMBOL_GPL(usbnet_skb_return);
348 /* must be called if hard_mtu or rx_urb_size changed */
349 void usbnet_update_max_qlen(struct usbnet *dev)
351 enum usb_device_speed speed = dev->udev->speed;
355 dev->rx_qlen = MAX_QUEUE_MEMORY / dev->rx_urb_size;
356 dev->tx_qlen = MAX_QUEUE_MEMORY / dev->hard_mtu;
358 case USB_SPEED_SUPER:
359 case USB_SPEED_SUPER_PLUS:
361 * Not take default 5ms qlen for super speed HC to
362 * save memory, and iperf tests show 2.5ms qlen can
365 dev->rx_qlen = 5 * MAX_QUEUE_MEMORY / dev->rx_urb_size;
366 dev->tx_qlen = 5 * MAX_QUEUE_MEMORY / dev->hard_mtu;
369 dev->rx_qlen = dev->tx_qlen = 4;
372 EXPORT_SYMBOL_GPL(usbnet_update_max_qlen);
375 /*-------------------------------------------------------------------------
377 * Network Device Driver (peer link to "Host Device", from USB host)
379 *-------------------------------------------------------------------------*/
381 int usbnet_change_mtu (struct net_device *net, int new_mtu)
383 struct usbnet *dev = netdev_priv(net);
384 int ll_mtu = new_mtu + net->hard_header_len;
385 int old_hard_mtu = dev->hard_mtu;
386 int old_rx_urb_size = dev->rx_urb_size;
388 // no second zero-length packet read wanted after mtu-sized packets
389 if ((ll_mtu % dev->maxpacket) == 0)
393 dev->hard_mtu = net->mtu + net->hard_header_len;
394 if (dev->rx_urb_size == old_hard_mtu) {
395 dev->rx_urb_size = dev->hard_mtu;
396 if (dev->rx_urb_size > old_rx_urb_size) {
397 usbnet_pause_rx(dev);
398 usbnet_unlink_rx_urbs(dev);
399 usbnet_resume_rx(dev);
403 /* max qlen depend on hard_mtu and rx_urb_size */
404 usbnet_update_max_qlen(dev);
408 EXPORT_SYMBOL_GPL(usbnet_change_mtu);
410 /* The caller must hold list->lock */
411 static void __usbnet_queue_skb(struct sk_buff_head *list,
412 struct sk_buff *newsk, enum skb_state state)
414 struct skb_data *entry = (struct skb_data *) newsk->cb;
416 __skb_queue_tail(list, newsk);
417 entry->state = state;
420 /*-------------------------------------------------------------------------*/
422 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
423 * completion callbacks. 2.5 should have fixed those bugs...
426 static enum skb_state defer_bh(struct usbnet *dev, struct sk_buff *skb,
427 struct sk_buff_head *list, enum skb_state state)
430 enum skb_state old_state;
431 struct skb_data *entry = (struct skb_data *) skb->cb;
433 spin_lock_irqsave(&list->lock, flags);
434 old_state = entry->state;
435 entry->state = state;
436 __skb_unlink(skb, list);
438 /* defer_bh() is never called with list == &dev->done.
439 * spin_lock_nested() tells lockdep that it is OK to take
440 * dev->done.lock here with list->lock held.
442 spin_lock_nested(&dev->done.lock, SINGLE_DEPTH_NESTING);
444 __skb_queue_tail(&dev->done, skb);
445 if (dev->done.qlen == 1)
446 tasklet_schedule(&dev->bh);
447 spin_unlock(&dev->done.lock);
448 spin_unlock_irqrestore(&list->lock, flags);
452 /* some work can't be done in tasklets, so we use keventd
454 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
455 * but tasklet_schedule() doesn't. hope the failure is rare.
457 void usbnet_defer_kevent (struct usbnet *dev, int work)
459 set_bit (work, &dev->flags);
460 if (!schedule_work (&dev->kevent)) {
462 netdev_err(dev->net, "kevent %d may have been dropped\n", work);
464 netdev_dbg(dev->net, "kevent %d scheduled\n", work);
467 EXPORT_SYMBOL_GPL(usbnet_defer_kevent);
469 /*-------------------------------------------------------------------------*/
471 static void rx_complete (struct urb *urb);
473 static int rx_submit (struct usbnet *dev, struct urb *urb, gfp_t flags)
476 struct skb_data *entry;
478 unsigned long lockflags;
479 size_t size = dev->rx_urb_size;
481 /* prevent rx skb allocation when error ratio is high */
482 if (test_bit(EVENT_RX_KILL, &dev->flags)) {
487 if (test_bit(EVENT_NO_IP_ALIGN, &dev->flags))
488 skb = __netdev_alloc_skb(dev->net, size, flags);
490 skb = __netdev_alloc_skb_ip_align(dev->net, size, flags);
492 netif_dbg(dev, rx_err, dev->net, "no rx skb\n");
493 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
498 entry = (struct skb_data *) skb->cb;
503 usb_fill_bulk_urb (urb, dev->udev, dev->in,
504 skb->data, size, rx_complete, skb);
506 spin_lock_irqsave (&dev->rxq.lock, lockflags);
508 if (netif_running (dev->net) &&
509 netif_device_present (dev->net) &&
510 !test_bit (EVENT_RX_HALT, &dev->flags) &&
511 !test_bit (EVENT_DEV_ASLEEP, &dev->flags)) {
512 switch (retval = usb_submit_urb (urb, GFP_ATOMIC)) {
514 usbnet_defer_kevent (dev, EVENT_RX_HALT);
517 usbnet_defer_kevent (dev, EVENT_RX_MEMORY);
520 netif_dbg(dev, ifdown, dev->net, "device gone\n");
521 netif_device_detach (dev->net);
527 netif_dbg(dev, rx_err, dev->net,
528 "rx submit, %d\n", retval);
529 tasklet_schedule (&dev->bh);
532 __usbnet_queue_skb(&dev->rxq, skb, rx_start);
535 netif_dbg(dev, ifdown, dev->net, "rx: stopped\n");
538 spin_unlock_irqrestore (&dev->rxq.lock, lockflags);
540 dev_kfree_skb_any (skb);
547 /*-------------------------------------------------------------------------*/
549 static inline void rx_process (struct usbnet *dev, struct sk_buff *skb)
551 if (dev->driver_info->rx_fixup &&
552 !dev->driver_info->rx_fixup (dev, skb)) {
553 /* With RX_ASSEMBLE, rx_fixup() must update counters */
554 if (!(dev->driver_info->flags & FLAG_RX_ASSEMBLE))
555 dev->net->stats.rx_errors++;
558 // else network stack removes extra byte if we forced a short packet
560 /* all data was already cloned from skb inside the driver */
561 if (dev->driver_info->flags & FLAG_MULTI_PACKET)
564 if (skb->len < ETH_HLEN) {
565 dev->net->stats.rx_errors++;
566 dev->net->stats.rx_length_errors++;
567 netif_dbg(dev, rx_err, dev->net, "rx length %d\n", skb->len);
569 usbnet_skb_return(dev, skb);
574 skb_queue_tail(&dev->done, skb);
577 /*-------------------------------------------------------------------------*/
579 static void rx_complete (struct urb *urb)
581 struct sk_buff *skb = (struct sk_buff *) urb->context;
582 struct skb_data *entry = (struct skb_data *) skb->cb;
583 struct usbnet *dev = entry->dev;
584 int urb_status = urb->status;
585 enum skb_state state;
587 skb_put (skb, urb->actual_length);
591 switch (urb_status) {
596 /* stalls need manual reset. this is rare ... except that
597 * when going through USB 2.0 TTs, unplug appears this way.
598 * we avoid the highspeed version of the ETIMEDOUT/EILSEQ
599 * storm, recovering as needed.
602 dev->net->stats.rx_errors++;
603 usbnet_defer_kevent (dev, EVENT_RX_HALT);
606 /* software-driven interface shutdown */
607 case -ECONNRESET: /* async unlink */
608 case -ESHUTDOWN: /* hardware gone */
609 netif_dbg(dev, ifdown, dev->net,
610 "rx shutdown, code %d\n", urb_status);
613 /* we get controller i/o faults during hub_wq disconnect() delays.
614 * throttle down resubmits, to avoid log floods; just temporarily,
615 * so we still recover when the fault isn't a hub_wq delay.
620 dev->net->stats.rx_errors++;
621 if (!timer_pending (&dev->delay)) {
622 mod_timer (&dev->delay, jiffies + THROTTLE_JIFFIES);
623 netif_dbg(dev, link, dev->net,
624 "rx throttle %d\n", urb_status);
632 /* data overrun ... flush fifo? */
634 dev->net->stats.rx_over_errors++;
639 dev->net->stats.rx_errors++;
640 netif_dbg(dev, rx_err, dev->net, "rx status %d\n", urb_status);
644 /* stop rx if packet error rate is high */
645 if (++dev->pkt_cnt > 30) {
649 if (state == rx_cleanup)
651 if (dev->pkt_err > 20)
652 set_bit(EVENT_RX_KILL, &dev->flags);
655 state = defer_bh(dev, skb, &dev->rxq, state);
658 if (netif_running (dev->net) &&
659 !test_bit (EVENT_RX_HALT, &dev->flags) &&
660 state != unlink_start) {
661 rx_submit (dev, urb, GFP_ATOMIC);
662 usb_mark_last_busy(dev->udev);
667 netif_dbg(dev, rx_err, dev->net, "no read resubmitted\n");
670 /*-------------------------------------------------------------------------*/
671 void usbnet_pause_rx(struct usbnet *dev)
673 set_bit(EVENT_RX_PAUSED, &dev->flags);
675 netif_dbg(dev, rx_status, dev->net, "paused rx queue enabled\n");
677 EXPORT_SYMBOL_GPL(usbnet_pause_rx);
679 void usbnet_resume_rx(struct usbnet *dev)
684 clear_bit(EVENT_RX_PAUSED, &dev->flags);
686 while ((skb = skb_dequeue(&dev->rxq_pause)) != NULL) {
687 usbnet_skb_return(dev, skb);
691 tasklet_schedule(&dev->bh);
693 netif_dbg(dev, rx_status, dev->net,
694 "paused rx queue disabled, %d skbs requeued\n", num);
696 EXPORT_SYMBOL_GPL(usbnet_resume_rx);
698 void usbnet_purge_paused_rxq(struct usbnet *dev)
700 skb_queue_purge(&dev->rxq_pause);
702 EXPORT_SYMBOL_GPL(usbnet_purge_paused_rxq);
704 /*-------------------------------------------------------------------------*/
706 // unlink pending rx/tx; completion handlers do all other cleanup
708 static int unlink_urbs (struct usbnet *dev, struct sk_buff_head *q)
714 spin_lock_irqsave (&q->lock, flags);
715 while (!skb_queue_empty(q)) {
716 struct skb_data *entry;
720 skb_queue_walk(q, skb) {
721 entry = (struct skb_data *) skb->cb;
722 if (entry->state != unlink_start)
727 entry->state = unlink_start;
731 * Get reference count of the URB to avoid it to be
732 * freed during usb_unlink_urb, which may trigger
733 * use-after-free problem inside usb_unlink_urb since
734 * usb_unlink_urb is always racing with .complete
735 * handler(include defer_bh).
738 spin_unlock_irqrestore(&q->lock, flags);
739 // during some PM-driven resume scenarios,
740 // these (async) unlinks complete immediately
741 retval = usb_unlink_urb (urb);
742 if (retval != -EINPROGRESS && retval != 0)
743 netdev_dbg(dev->net, "unlink urb err, %d\n", retval);
747 spin_lock_irqsave(&q->lock, flags);
749 spin_unlock_irqrestore (&q->lock, flags);
753 // Flush all pending rx urbs
754 // minidrivers may need to do this when the MTU changes
756 void usbnet_unlink_rx_urbs(struct usbnet *dev)
758 if (netif_running(dev->net)) {
759 (void) unlink_urbs (dev, &dev->rxq);
760 tasklet_schedule(&dev->bh);
763 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
765 /*-------------------------------------------------------------------------*/
767 static void wait_skb_queue_empty(struct sk_buff_head *q)
771 spin_lock_irqsave(&q->lock, flags);
772 while (!skb_queue_empty(q)) {
773 spin_unlock_irqrestore(&q->lock, flags);
774 schedule_timeout(msecs_to_jiffies(UNLINK_TIMEOUT_MS));
775 set_current_state(TASK_UNINTERRUPTIBLE);
776 spin_lock_irqsave(&q->lock, flags);
778 spin_unlock_irqrestore(&q->lock, flags);
781 // precondition: never called in_interrupt
782 static void usbnet_terminate_urbs(struct usbnet *dev)
784 DECLARE_WAITQUEUE(wait, current);
787 /* ensure there are no more active urbs */
788 add_wait_queue(&dev->wait, &wait);
789 set_current_state(TASK_UNINTERRUPTIBLE);
790 temp = unlink_urbs(dev, &dev->txq) +
791 unlink_urbs(dev, &dev->rxq);
793 /* maybe wait for deletions to finish. */
794 wait_skb_queue_empty(&dev->rxq);
795 wait_skb_queue_empty(&dev->txq);
796 wait_skb_queue_empty(&dev->done);
797 netif_dbg(dev, ifdown, dev->net,
798 "waited for %d urb completions\n", temp);
799 set_current_state(TASK_RUNNING);
800 remove_wait_queue(&dev->wait, &wait);
803 int usbnet_stop (struct net_device *net)
805 struct usbnet *dev = netdev_priv(net);
806 struct driver_info *info = dev->driver_info;
809 clear_bit(EVENT_DEV_OPEN, &dev->flags);
810 netif_stop_queue (net);
812 netif_info(dev, ifdown, dev->net,
813 "stop stats: rx/tx %lu/%lu, errs %lu/%lu\n",
814 net->stats.rx_packets, net->stats.tx_packets,
815 net->stats.rx_errors, net->stats.tx_errors);
817 /* to not race resume */
818 pm = usb_autopm_get_interface(dev->intf);
819 /* allow minidriver to stop correctly (wireless devices to turn off
822 retval = info->stop(dev);
824 netif_info(dev, ifdown, dev->net,
825 "stop fail (%d) usbnet usb-%s-%s, %s\n",
827 dev->udev->bus->bus_name, dev->udev->devpath,
831 if (!(info->flags & FLAG_AVOID_UNLINK_URBS))
832 usbnet_terminate_urbs(dev);
834 usbnet_status_stop(dev);
836 usbnet_purge_paused_rxq(dev);
838 mpn = !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
840 /* deferred work (task, timer, softirq) must also stop.
841 * can't flush_scheduled_work() until we drop rtnl (later),
842 * else workers could deadlock; so make workers a NOP.
845 del_timer_sync (&dev->delay);
846 tasklet_kill (&dev->bh);
848 usb_autopm_put_interface(dev->intf);
850 if (info->manage_power && mpn)
851 info->manage_power(dev, 0);
853 usb_autopm_put_interface(dev->intf);
857 EXPORT_SYMBOL_GPL(usbnet_stop);
859 /*-------------------------------------------------------------------------*/
861 // posts reads, and enables write queuing
863 // precondition: never called in_interrupt
865 int usbnet_open (struct net_device *net)
867 struct usbnet *dev = netdev_priv(net);
869 struct driver_info *info = dev->driver_info;
871 if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
872 netif_info(dev, ifup, dev->net,
873 "resumption fail (%d) usbnet usb-%s-%s, %s\n",
875 dev->udev->bus->bus_name,
881 // put into "known safe" state
882 if (info->reset && (retval = info->reset (dev)) < 0) {
883 netif_info(dev, ifup, dev->net,
884 "open reset fail (%d) usbnet usb-%s-%s, %s\n",
886 dev->udev->bus->bus_name,
892 /* hard_mtu or rx_urb_size may change in reset() */
893 usbnet_update_max_qlen(dev);
895 // insist peer be connected
896 if (info->check_connect && (retval = info->check_connect (dev)) < 0) {
897 netif_dbg(dev, ifup, dev->net, "can't open; %d\n", retval);
901 /* start any status interrupt transfer */
902 if (dev->interrupt) {
903 retval = usbnet_status_start(dev, GFP_KERNEL);
905 netif_err(dev, ifup, dev->net,
906 "intr submit %d\n", retval);
911 set_bit(EVENT_DEV_OPEN, &dev->flags);
912 netif_start_queue (net);
913 netif_info(dev, ifup, dev->net,
914 "open: enable queueing (rx %d, tx %d) mtu %d %s framing\n",
915 (int)RX_QLEN(dev), (int)TX_QLEN(dev),
917 (dev->driver_info->flags & FLAG_FRAMING_NC) ? "NetChip" :
918 (dev->driver_info->flags & FLAG_FRAMING_GL) ? "GeneSys" :
919 (dev->driver_info->flags & FLAG_FRAMING_Z) ? "Zaurus" :
920 (dev->driver_info->flags & FLAG_FRAMING_RN) ? "RNDIS" :
921 (dev->driver_info->flags & FLAG_FRAMING_AX) ? "ASIX" :
924 /* reset rx error state */
927 clear_bit(EVENT_RX_KILL, &dev->flags);
929 // delay posting reads until we're fully open
930 tasklet_schedule (&dev->bh);
931 if (info->manage_power) {
932 retval = info->manage_power(dev, 1);
935 set_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
937 usb_autopm_put_interface(dev->intf);
942 usb_autopm_put_interface(dev->intf);
946 EXPORT_SYMBOL_GPL(usbnet_open);
948 /*-------------------------------------------------------------------------*/
950 /* ethtool methods; minidrivers may need to add some more, but
951 * they'll probably want to use this base set.
954 int usbnet_get_link_ksettings(struct net_device *net,
955 struct ethtool_link_ksettings *cmd)
957 struct usbnet *dev = netdev_priv(net);
959 if (!dev->mii.mdio_read)
962 mii_ethtool_get_link_ksettings(&dev->mii, cmd);
966 EXPORT_SYMBOL_GPL(usbnet_get_link_ksettings);
968 int usbnet_set_link_ksettings(struct net_device *net,
969 const struct ethtool_link_ksettings *cmd)
971 struct usbnet *dev = netdev_priv(net);
974 if (!dev->mii.mdio_write)
977 retval = mii_ethtool_set_link_ksettings(&dev->mii, cmd);
979 /* link speed/duplex might have changed */
980 if (dev->driver_info->link_reset)
981 dev->driver_info->link_reset(dev);
983 /* hard_mtu or rx_urb_size may change in link_reset() */
984 usbnet_update_max_qlen(dev);
988 EXPORT_SYMBOL_GPL(usbnet_set_link_ksettings);
990 void usbnet_get_stats64(struct net_device *net, struct rtnl_link_stats64 *stats)
992 struct usbnet *dev = netdev_priv(net);
996 netdev_stats_to_stats64(stats, &net->stats);
998 for_each_possible_cpu(cpu) {
999 struct pcpu_sw_netstats *stats64;
1000 u64 rx_packets, rx_bytes;
1001 u64 tx_packets, tx_bytes;
1003 stats64 = per_cpu_ptr(dev->stats64, cpu);
1006 start = u64_stats_fetch_begin_irq(&stats64->syncp);
1007 rx_packets = stats64->rx_packets;
1008 rx_bytes = stats64->rx_bytes;
1009 tx_packets = stats64->tx_packets;
1010 tx_bytes = stats64->tx_bytes;
1011 } while (u64_stats_fetch_retry_irq(&stats64->syncp, start));
1013 stats->rx_packets += rx_packets;
1014 stats->rx_bytes += rx_bytes;
1015 stats->tx_packets += tx_packets;
1016 stats->tx_bytes += tx_bytes;
1019 EXPORT_SYMBOL_GPL(usbnet_get_stats64);
1021 u32 usbnet_get_link (struct net_device *net)
1023 struct usbnet *dev = netdev_priv(net);
1025 /* If a check_connect is defined, return its result */
1026 if (dev->driver_info->check_connect)
1027 return dev->driver_info->check_connect (dev) == 0;
1029 /* if the device has mii operations, use those */
1030 if (dev->mii.mdio_read)
1031 return mii_link_ok(&dev->mii);
1033 /* Otherwise, dtrt for drivers calling netif_carrier_{on,off} */
1034 return ethtool_op_get_link(net);
1036 EXPORT_SYMBOL_GPL(usbnet_get_link);
1038 int usbnet_nway_reset(struct net_device *net)
1040 struct usbnet *dev = netdev_priv(net);
1042 if (!dev->mii.mdio_write)
1045 return mii_nway_restart(&dev->mii);
1047 EXPORT_SYMBOL_GPL(usbnet_nway_reset);
1049 void usbnet_get_drvinfo (struct net_device *net, struct ethtool_drvinfo *info)
1051 struct usbnet *dev = netdev_priv(net);
1053 strlcpy (info->driver, dev->driver_name, sizeof info->driver);
1054 strlcpy (info->version, DRIVER_VERSION, sizeof info->version);
1055 strlcpy (info->fw_version, dev->driver_info->description,
1056 sizeof info->fw_version);
1057 usb_make_path (dev->udev, info->bus_info, sizeof info->bus_info);
1059 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo);
1061 u32 usbnet_get_msglevel (struct net_device *net)
1063 struct usbnet *dev = netdev_priv(net);
1065 return dev->msg_enable;
1067 EXPORT_SYMBOL_GPL(usbnet_get_msglevel);
1069 void usbnet_set_msglevel (struct net_device *net, u32 level)
1071 struct usbnet *dev = netdev_priv(net);
1073 dev->msg_enable = level;
1075 EXPORT_SYMBOL_GPL(usbnet_set_msglevel);
1077 /* drivers may override default ethtool_ops in their bind() routine */
1078 static const struct ethtool_ops usbnet_ethtool_ops = {
1079 .get_link = usbnet_get_link,
1080 .nway_reset = usbnet_nway_reset,
1081 .get_drvinfo = usbnet_get_drvinfo,
1082 .get_msglevel = usbnet_get_msglevel,
1083 .set_msglevel = usbnet_set_msglevel,
1084 .get_ts_info = ethtool_op_get_ts_info,
1085 .get_link_ksettings = usbnet_get_link_ksettings,
1086 .set_link_ksettings = usbnet_set_link_ksettings,
1089 /*-------------------------------------------------------------------------*/
1091 static void __handle_link_change(struct usbnet *dev)
1093 if (!test_bit(EVENT_DEV_OPEN, &dev->flags))
1096 if (!netif_carrier_ok(dev->net)) {
1097 /* kill URBs for reading packets to save bus bandwidth */
1098 unlink_urbs(dev, &dev->rxq);
1101 * tx_timeout will unlink URBs for sending packets and
1102 * tx queue is stopped by netcore after link becomes off
1105 /* submitting URBs for reading packets */
1106 tasklet_schedule(&dev->bh);
1109 /* hard_mtu or rx_urb_size may change during link change */
1110 usbnet_update_max_qlen(dev);
1112 clear_bit(EVENT_LINK_CHANGE, &dev->flags);
1115 static void usbnet_set_rx_mode(struct net_device *net)
1117 struct usbnet *dev = netdev_priv(net);
1119 usbnet_defer_kevent(dev, EVENT_SET_RX_MODE);
1122 static void __handle_set_rx_mode(struct usbnet *dev)
1124 if (dev->driver_info->set_rx_mode)
1125 (dev->driver_info->set_rx_mode)(dev);
1127 clear_bit(EVENT_SET_RX_MODE, &dev->flags);
1130 /* work that cannot be done in interrupt context uses keventd.
1132 * NOTE: with 2.5 we could do more of this using completion callbacks,
1133 * especially now that control transfers can be queued.
1136 usbnet_deferred_kevent (struct work_struct *work)
1138 struct usbnet *dev =
1139 container_of(work, struct usbnet, kevent);
1142 /* usb_clear_halt() needs a thread context */
1143 if (test_bit (EVENT_TX_HALT, &dev->flags)) {
1144 unlink_urbs (dev, &dev->txq);
1145 status = usb_autopm_get_interface(dev->intf);
1148 status = usb_clear_halt (dev->udev, dev->out);
1149 usb_autopm_put_interface(dev->intf);
1152 status != -ESHUTDOWN) {
1153 if (netif_msg_tx_err (dev))
1155 netdev_err(dev->net, "can't clear tx halt, status %d\n",
1158 clear_bit (EVENT_TX_HALT, &dev->flags);
1159 if (status != -ESHUTDOWN)
1160 netif_wake_queue (dev->net);
1163 if (test_bit (EVENT_RX_HALT, &dev->flags)) {
1164 unlink_urbs (dev, &dev->rxq);
1165 status = usb_autopm_get_interface(dev->intf);
1168 status = usb_clear_halt (dev->udev, dev->in);
1169 usb_autopm_put_interface(dev->intf);
1172 status != -ESHUTDOWN) {
1173 if (netif_msg_rx_err (dev))
1175 netdev_err(dev->net, "can't clear rx halt, status %d\n",
1178 clear_bit (EVENT_RX_HALT, &dev->flags);
1179 tasklet_schedule (&dev->bh);
1183 /* tasklet could resubmit itself forever if memory is tight */
1184 if (test_bit (EVENT_RX_MEMORY, &dev->flags)) {
1185 struct urb *urb = NULL;
1188 if (netif_running (dev->net))
1189 urb = usb_alloc_urb (0, GFP_KERNEL);
1191 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1193 clear_bit (EVENT_RX_MEMORY, &dev->flags);
1194 status = usb_autopm_get_interface(dev->intf);
1199 if (rx_submit (dev, urb, GFP_KERNEL) == -ENOLINK)
1201 usb_autopm_put_interface(dev->intf);
1204 tasklet_schedule (&dev->bh);
1208 if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
1209 struct driver_info *info = dev->driver_info;
1212 clear_bit (EVENT_LINK_RESET, &dev->flags);
1213 status = usb_autopm_get_interface(dev->intf);
1216 if(info->link_reset && (retval = info->link_reset(dev)) < 0) {
1217 usb_autopm_put_interface(dev->intf);
1219 netdev_info(dev->net, "link reset failed (%d) usbnet usb-%s-%s, %s\n",
1221 dev->udev->bus->bus_name,
1225 usb_autopm_put_interface(dev->intf);
1228 /* handle link change from link resetting */
1229 __handle_link_change(dev);
1232 if (test_bit (EVENT_LINK_CHANGE, &dev->flags))
1233 __handle_link_change(dev);
1235 if (test_bit (EVENT_SET_RX_MODE, &dev->flags))
1236 __handle_set_rx_mode(dev);
1240 netdev_dbg(dev->net, "kevent done, flags = 0x%lx\n", dev->flags);
1243 /*-------------------------------------------------------------------------*/
1245 static void tx_complete (struct urb *urb)
1247 struct sk_buff *skb = (struct sk_buff *) urb->context;
1248 struct skb_data *entry = (struct skb_data *) skb->cb;
1249 struct usbnet *dev = entry->dev;
1251 if (urb->status == 0) {
1252 struct pcpu_sw_netstats *stats64 = this_cpu_ptr(dev->stats64);
1254 u64_stats_update_begin(&stats64->syncp);
1255 stats64->tx_packets += entry->packets;
1256 stats64->tx_bytes += entry->length;
1257 u64_stats_update_end(&stats64->syncp);
1259 dev->net->stats.tx_errors++;
1261 switch (urb->status) {
1263 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1266 /* software-driven interface shutdown */
1267 case -ECONNRESET: // async unlink
1268 case -ESHUTDOWN: // hardware gone
1271 /* like rx, tx gets controller i/o faults during hub_wq
1272 * delays and so it uses the same throttling mechanism.
1277 usb_mark_last_busy(dev->udev);
1278 if (!timer_pending (&dev->delay)) {
1279 mod_timer (&dev->delay,
1280 jiffies + THROTTLE_JIFFIES);
1281 netif_dbg(dev, link, dev->net,
1282 "tx throttle %d\n", urb->status);
1284 netif_stop_queue (dev->net);
1287 netif_dbg(dev, tx_err, dev->net,
1288 "tx err %d\n", entry->urb->status);
1293 usb_autopm_put_interface_async(dev->intf);
1294 (void) defer_bh(dev, skb, &dev->txq, tx_done);
1297 /*-------------------------------------------------------------------------*/
1299 void usbnet_tx_timeout (struct net_device *net)
1301 struct usbnet *dev = netdev_priv(net);
1303 unlink_urbs (dev, &dev->txq);
1304 tasklet_schedule (&dev->bh);
1305 /* this needs to be handled individually because the generic layer
1306 * doesn't know what is sufficient and could not restore private
1307 * information if a remedy of an unconditional reset were used.
1309 if (dev->driver_info->recover)
1310 (dev->driver_info->recover)(dev);
1312 EXPORT_SYMBOL_GPL(usbnet_tx_timeout);
1314 /*-------------------------------------------------------------------------*/
1316 static int build_dma_sg(const struct sk_buff *skb, struct urb *urb)
1318 unsigned num_sgs, total_len = 0;
1321 num_sgs = skb_shinfo(skb)->nr_frags + 1;
1325 /* reserve one for zero packet */
1326 urb->sg = kmalloc((num_sgs + 1) * sizeof(struct scatterlist),
1331 urb->num_sgs = num_sgs;
1332 sg_init_table(urb->sg, urb->num_sgs + 1);
1334 sg_set_buf(&urb->sg[s++], skb->data, skb_headlen(skb));
1335 total_len += skb_headlen(skb);
1337 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1338 struct skb_frag_struct *f = &skb_shinfo(skb)->frags[i];
1340 total_len += skb_frag_size(f);
1341 sg_set_page(&urb->sg[i + s], f->page.p, f->size,
1344 urb->transfer_buffer_length = total_len;
1349 netdev_tx_t usbnet_start_xmit (struct sk_buff *skb,
1350 struct net_device *net)
1352 struct usbnet *dev = netdev_priv(net);
1353 unsigned int length;
1354 struct urb *urb = NULL;
1355 struct skb_data *entry;
1356 struct driver_info *info = dev->driver_info;
1357 unsigned long flags;
1361 skb_tx_timestamp(skb);
1363 // some devices want funky USB-level framing, for
1364 // win32 driver (usually) and/or hardware quirks
1365 if (info->tx_fixup) {
1366 skb = info->tx_fixup (dev, skb, GFP_ATOMIC);
1368 /* packet collected; minidriver waiting for more */
1369 if (info->flags & FLAG_MULTI_PACKET)
1371 netif_dbg(dev, tx_err, dev->net, "can't tx_fixup skb\n");
1376 if (!(urb = usb_alloc_urb (0, GFP_ATOMIC))) {
1377 netif_dbg(dev, tx_err, dev->net, "no urb\n");
1381 entry = (struct skb_data *) skb->cb;
1385 usb_fill_bulk_urb (urb, dev->udev, dev->out,
1386 skb->data, skb->len, tx_complete, skb);
1387 if (dev->can_dma_sg) {
1388 if (build_dma_sg(skb, urb) < 0)
1391 length = urb->transfer_buffer_length;
1393 /* don't assume the hardware handles USB_ZERO_PACKET
1394 * NOTE: strictly conforming cdc-ether devices should expect
1395 * the ZLP here, but ignore the one-byte packet.
1396 * NOTE2: CDC NCM specification is different from CDC ECM when
1397 * handling ZLP/short packets, so cdc_ncm driver will make short
1398 * packet itself if needed.
1400 if (length % dev->maxpacket == 0) {
1401 if (!(info->flags & FLAG_SEND_ZLP)) {
1402 if (!(info->flags & FLAG_MULTI_PACKET)) {
1404 if (skb_tailroom(skb) && !urb->num_sgs) {
1405 skb->data[skb->len] = 0;
1407 } else if (urb->num_sgs)
1408 sg_set_buf(&urb->sg[urb->num_sgs++],
1409 dev->padding_pkt, 1);
1412 urb->transfer_flags |= URB_ZERO_PACKET;
1414 urb->transfer_buffer_length = length;
1416 if (info->flags & FLAG_MULTI_PACKET) {
1417 /* Driver has set number of packets and a length delta.
1418 * Calculate the complete length and ensure that it's
1421 entry->length += length;
1422 if (WARN_ON_ONCE(entry->length <= 0))
1423 entry->length = length;
1425 usbnet_set_skb_tx_stats(skb, 1, length);
1428 spin_lock_irqsave(&dev->txq.lock, flags);
1429 retval = usb_autopm_get_interface_async(dev->intf);
1431 spin_unlock_irqrestore(&dev->txq.lock, flags);
1436 /* if this triggers the device is still a sleep */
1437 if (test_bit(EVENT_DEV_ASLEEP, &dev->flags)) {
1438 /* transmission will be done in resume */
1439 usb_anchor_urb(urb, &dev->deferred);
1440 /* no use to process more packets */
1441 netif_stop_queue(net);
1443 spin_unlock_irqrestore(&dev->txq.lock, flags);
1444 netdev_dbg(dev->net, "Delaying transmission for resumption\n");
1449 switch ((retval = usb_submit_urb (urb, GFP_ATOMIC))) {
1451 netif_stop_queue (net);
1452 usbnet_defer_kevent (dev, EVENT_TX_HALT);
1453 usb_autopm_put_interface_async(dev->intf);
1456 usb_autopm_put_interface_async(dev->intf);
1457 netif_dbg(dev, tx_err, dev->net,
1458 "tx: submit urb err %d\n", retval);
1461 netif_trans_update(net);
1462 __usbnet_queue_skb(&dev->txq, skb, tx_start);
1463 if (dev->txq.qlen >= TX_QLEN (dev))
1464 netif_stop_queue (net);
1466 spin_unlock_irqrestore (&dev->txq.lock, flags);
1469 netif_dbg(dev, tx_err, dev->net, "drop, code %d\n", retval);
1471 dev->net->stats.tx_dropped++;
1474 dev_kfree_skb_any (skb);
1480 netif_dbg(dev, tx_queued, dev->net,
1481 "> tx, len %u, type 0x%x\n", length, skb->protocol);
1485 return NETDEV_TX_OK;
1487 EXPORT_SYMBOL_GPL(usbnet_start_xmit);
1489 static int rx_alloc_submit(struct usbnet *dev, gfp_t flags)
1495 /* don't refill the queue all at once */
1496 for (i = 0; i < 10 && dev->rxq.qlen < RX_QLEN(dev); i++) {
1497 urb = usb_alloc_urb(0, flags);
1499 ret = rx_submit(dev, urb, flags);
1511 /*-------------------------------------------------------------------------*/
1513 // tasklet (work deferred from completions, in_irq) or timer
1515 static void usbnet_bh (struct timer_list *t)
1517 struct usbnet *dev = from_timer(dev, t, delay);
1518 struct sk_buff *skb;
1519 struct skb_data *entry;
1521 while ((skb = skb_dequeue (&dev->done))) {
1522 entry = (struct skb_data *) skb->cb;
1523 switch (entry->state) {
1525 entry->state = rx_cleanup;
1526 rx_process (dev, skb);
1529 kfree(entry->urb->sg);
1531 usb_free_urb (entry->urb);
1532 dev_kfree_skb (skb);
1535 netdev_dbg(dev->net, "bogus skb state %d\n", entry->state);
1539 /* restart RX again after disabling due to high error rate */
1540 clear_bit(EVENT_RX_KILL, &dev->flags);
1542 /* waiting for all pending urbs to complete?
1543 * only then can we forgo submitting anew
1545 if (waitqueue_active(&dev->wait)) {
1546 if (dev->txq.qlen + dev->rxq.qlen + dev->done.qlen == 0)
1547 wake_up_all(&dev->wait);
1549 // or are we maybe short a few urbs?
1550 } else if (netif_running (dev->net) &&
1551 netif_device_present (dev->net) &&
1552 netif_carrier_ok(dev->net) &&
1553 !timer_pending(&dev->delay) &&
1554 !test_bit(EVENT_RX_PAUSED, &dev->flags) &&
1555 !test_bit(EVENT_RX_HALT, &dev->flags)) {
1556 int temp = dev->rxq.qlen;
1558 if (temp < RX_QLEN(dev)) {
1559 if (rx_alloc_submit(dev, GFP_ATOMIC) == -ENOLINK)
1561 if (temp != dev->rxq.qlen)
1562 netif_dbg(dev, link, dev->net,
1563 "rxqlen %d --> %d\n",
1564 temp, dev->rxq.qlen);
1565 if (dev->rxq.qlen < RX_QLEN(dev))
1566 tasklet_schedule (&dev->bh);
1568 if (dev->txq.qlen < TX_QLEN (dev))
1569 netif_wake_queue (dev->net);
1574 /*-------------------------------------------------------------------------
1576 * USB Device Driver support
1578 *-------------------------------------------------------------------------*/
1580 // precondition: never called in_interrupt
1582 void usbnet_disconnect (struct usb_interface *intf)
1585 struct usb_device *xdev;
1586 struct net_device *net;
1588 dev = usb_get_intfdata(intf);
1589 usb_set_intfdata(intf, NULL);
1593 xdev = interface_to_usbdev (intf);
1595 netif_info(dev, probe, dev->net, "unregister '%s' usb-%s-%s, %s\n",
1596 intf->dev.driver->name,
1597 xdev->bus->bus_name, xdev->devpath,
1598 dev->driver_info->description);
1601 unregister_netdev (net);
1603 cancel_work_sync(&dev->kevent);
1605 usb_scuttle_anchored_urbs(&dev->deferred);
1607 if (dev->driver_info->unbind)
1608 dev->driver_info->unbind (dev, intf);
1610 usb_kill_urb(dev->interrupt);
1611 usb_free_urb(dev->interrupt);
1612 kfree(dev->padding_pkt);
1614 free_percpu(dev->stats64);
1617 EXPORT_SYMBOL_GPL(usbnet_disconnect);
1619 static const struct net_device_ops usbnet_netdev_ops = {
1620 .ndo_open = usbnet_open,
1621 .ndo_stop = usbnet_stop,
1622 .ndo_start_xmit = usbnet_start_xmit,
1623 .ndo_tx_timeout = usbnet_tx_timeout,
1624 .ndo_set_rx_mode = usbnet_set_rx_mode,
1625 .ndo_change_mtu = usbnet_change_mtu,
1626 .ndo_get_stats64 = usbnet_get_stats64,
1627 .ndo_set_mac_address = eth_mac_addr,
1628 .ndo_validate_addr = eth_validate_addr,
1631 /*-------------------------------------------------------------------------*/
1633 // precondition: never called in_interrupt
1635 static struct device_type wlan_type = {
1639 static struct device_type wwan_type = {
1644 usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
1647 struct net_device *net;
1648 struct usb_host_interface *interface;
1649 struct driver_info *info;
1650 struct usb_device *xdev;
1653 struct usb_driver *driver = to_usb_driver(udev->dev.driver);
1655 /* usbnet already took usb runtime pm, so have to enable the feature
1656 * for usb interface, otherwise usb_autopm_get_interface may return
1657 * failure if RUNTIME_PM is enabled.
1659 if (!driver->supports_autosuspend) {
1660 driver->supports_autosuspend = 1;
1661 pm_runtime_enable(&udev->dev);
1664 name = udev->dev.driver->name;
1665 info = (struct driver_info *) prod->driver_info;
1667 dev_dbg (&udev->dev, "blacklisted by %s\n", name);
1670 xdev = interface_to_usbdev (udev);
1671 interface = udev->cur_altsetting;
1675 // set up our own records
1676 net = alloc_etherdev(sizeof(*dev));
1680 /* netdev_printk() needs this so do it as early as possible */
1681 SET_NETDEV_DEV(net, &udev->dev);
1683 dev = netdev_priv(net);
1686 dev->driver_info = info;
1687 dev->driver_name = name;
1689 dev->stats64 = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1693 dev->msg_enable = netif_msg_init (msg_level, NETIF_MSG_DRV
1694 | NETIF_MSG_PROBE | NETIF_MSG_LINK);
1695 init_waitqueue_head(&dev->wait);
1696 skb_queue_head_init (&dev->rxq);
1697 skb_queue_head_init (&dev->txq);
1698 skb_queue_head_init (&dev->done);
1699 skb_queue_head_init(&dev->rxq_pause);
1700 dev->bh.func = (void (*)(unsigned long))usbnet_bh;
1701 dev->bh.data = (unsigned long)&dev->delay;
1702 INIT_WORK (&dev->kevent, usbnet_deferred_kevent);
1703 init_usb_anchor(&dev->deferred);
1704 timer_setup(&dev->delay, usbnet_bh, 0);
1705 mutex_init (&dev->phy_mutex);
1706 mutex_init(&dev->interrupt_mutex);
1707 dev->interrupt_count = 0;
1710 strcpy (net->name, "usb%d");
1711 memcpy (net->dev_addr, node_id, sizeof node_id);
1713 /* rx and tx sides can use different message sizes;
1714 * bind() should set rx_urb_size in that case.
1716 dev->hard_mtu = net->mtu + net->hard_header_len;
1718 net->max_mtu = ETH_MAX_MTU;
1720 net->netdev_ops = &usbnet_netdev_ops;
1721 net->watchdog_timeo = TX_TIMEOUT_JIFFIES;
1722 net->ethtool_ops = &usbnet_ethtool_ops;
1724 // allow device-specific bind/init procedures
1725 // NOTE net->name still not usable ...
1727 status = info->bind (dev, udev);
1731 // heuristic: "usb%d" for links we know are two-host,
1732 // else "eth%d" when there's reasonable doubt. userspace
1733 // can rename the link if it knows better.
1734 if ((dev->driver_info->flags & FLAG_ETHER) != 0 &&
1735 ((dev->driver_info->flags & FLAG_POINTTOPOINT) == 0 ||
1736 (net->dev_addr [0] & 0x02) == 0))
1737 strcpy (net->name, "eth%d");
1738 /* WLAN devices should always be named "wlan%d" */
1739 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1740 strcpy(net->name, "wlan%d");
1741 /* WWAN devices should always be named "wwan%d" */
1742 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1743 strcpy(net->name, "wwan%d");
1745 /* devices that cannot do ARP */
1746 if ((dev->driver_info->flags & FLAG_NOARP) != 0)
1747 net->flags |= IFF_NOARP;
1749 /* maybe the remote can't receive an Ethernet MTU */
1750 if (net->mtu > (dev->hard_mtu - net->hard_header_len))
1751 net->mtu = dev->hard_mtu - net->hard_header_len;
1752 } else if (!info->in || !info->out)
1753 status = usbnet_get_endpoints (dev, udev);
1755 dev->in = usb_rcvbulkpipe (xdev, info->in);
1756 dev->out = usb_sndbulkpipe (xdev, info->out);
1757 if (!(info->flags & FLAG_NO_SETINT))
1758 status = usb_set_interface (xdev,
1759 interface->desc.bInterfaceNumber,
1760 interface->desc.bAlternateSetting);
1765 if (status >= 0 && dev->status)
1766 status = init_status (dev, udev);
1770 if (!dev->rx_urb_size)
1771 dev->rx_urb_size = dev->hard_mtu;
1772 dev->maxpacket = usb_maxpacket (dev->udev, dev->out, 1);
1774 /* let userspace know we have a random address */
1775 if (ether_addr_equal(net->dev_addr, node_id))
1776 net->addr_assign_type = NET_ADDR_RANDOM;
1778 if ((dev->driver_info->flags & FLAG_WLAN) != 0)
1779 SET_NETDEV_DEVTYPE(net, &wlan_type);
1780 if ((dev->driver_info->flags & FLAG_WWAN) != 0)
1781 SET_NETDEV_DEVTYPE(net, &wwan_type);
1783 /* initialize max rx_qlen and tx_qlen */
1784 usbnet_update_max_qlen(dev);
1786 if (dev->can_dma_sg && !(info->flags & FLAG_SEND_ZLP) &&
1787 !(info->flags & FLAG_MULTI_PACKET)) {
1788 dev->padding_pkt = kzalloc(1, GFP_KERNEL);
1789 if (!dev->padding_pkt) {
1795 status = register_netdev (net);
1798 netif_info(dev, probe, dev->net,
1799 "register '%s' at usb-%s-%s, %s, %pM\n",
1800 udev->dev.driver->name,
1801 xdev->bus->bus_name, xdev->devpath,
1802 dev->driver_info->description,
1805 // ok, it's ready to go.
1806 usb_set_intfdata (udev, dev);
1808 netif_device_attach (net);
1810 if (dev->driver_info->flags & FLAG_LINK_INTR)
1811 usbnet_link_change(dev, 0, 0);
1816 kfree(dev->padding_pkt);
1818 usb_free_urb(dev->interrupt);
1821 info->unbind (dev, udev);
1823 /* subdrivers must undo all they did in bind() if they
1824 * fail it, but we may fail later and a deferred kevent
1825 * may trigger an error resubmitting itself and, worse,
1826 * schedule a timer. So we kill it all just in case.
1828 cancel_work_sync(&dev->kevent);
1829 del_timer_sync(&dev->delay);
1830 free_percpu(dev->stats64);
1836 EXPORT_SYMBOL_GPL(usbnet_probe);
1838 /*-------------------------------------------------------------------------*/
1841 * suspend the whole driver as soon as the first interface is suspended
1842 * resume only when the last interface is resumed
1845 int usbnet_suspend (struct usb_interface *intf, pm_message_t message)
1847 struct usbnet *dev = usb_get_intfdata(intf);
1849 if (!dev->suspend_count++) {
1850 spin_lock_irq(&dev->txq.lock);
1851 /* don't autosuspend while transmitting */
1852 if (dev->txq.qlen && PMSG_IS_AUTO(message)) {
1853 dev->suspend_count--;
1854 spin_unlock_irq(&dev->txq.lock);
1857 set_bit(EVENT_DEV_ASLEEP, &dev->flags);
1858 spin_unlock_irq(&dev->txq.lock);
1861 * accelerate emptying of the rx and queues, to avoid
1862 * having everything error out.
1864 netif_device_detach (dev->net);
1865 usbnet_terminate_urbs(dev);
1866 __usbnet_status_stop_force(dev);
1869 * reattach so runtime management can use and
1872 netif_device_attach (dev->net);
1876 EXPORT_SYMBOL_GPL(usbnet_suspend);
1878 int usbnet_resume (struct usb_interface *intf)
1880 struct usbnet *dev = usb_get_intfdata(intf);
1881 struct sk_buff *skb;
1885 if (!--dev->suspend_count) {
1886 /* resume interrupt URB if it was previously submitted */
1887 __usbnet_status_start_force(dev, GFP_NOIO);
1889 spin_lock_irq(&dev->txq.lock);
1890 while ((res = usb_get_from_anchor(&dev->deferred))) {
1892 skb = (struct sk_buff *)res->context;
1893 retval = usb_submit_urb(res, GFP_ATOMIC);
1895 dev_kfree_skb_any(skb);
1898 usb_autopm_put_interface_async(dev->intf);
1900 netif_trans_update(dev->net);
1901 __skb_queue_tail(&dev->txq, skb);
1906 clear_bit(EVENT_DEV_ASLEEP, &dev->flags);
1907 spin_unlock_irq(&dev->txq.lock);
1909 if (test_bit(EVENT_DEV_OPEN, &dev->flags)) {
1910 /* handle remote wakeup ASAP
1911 * we cannot race against stop
1913 if (netif_device_present(dev->net) &&
1914 !timer_pending(&dev->delay) &&
1915 !test_bit(EVENT_RX_HALT, &dev->flags))
1916 rx_alloc_submit(dev, GFP_NOIO);
1918 if (!(dev->txq.qlen >= TX_QLEN(dev)))
1919 netif_tx_wake_all_queues(dev->net);
1920 tasklet_schedule (&dev->bh);
1924 if (test_and_clear_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags))
1925 usb_autopm_get_interface_no_resume(intf);
1929 EXPORT_SYMBOL_GPL(usbnet_resume);
1932 * Either a subdriver implements manage_power, then it is assumed to always
1933 * be ready to be suspended or it reports the readiness to be suspended
1936 void usbnet_device_suggests_idle(struct usbnet *dev)
1938 if (!test_and_set_bit(EVENT_DEVICE_REPORT_IDLE, &dev->flags)) {
1939 dev->intf->needs_remote_wakeup = 1;
1940 usb_autopm_put_interface_async(dev->intf);
1943 EXPORT_SYMBOL(usbnet_device_suggests_idle);
1946 * For devices that can do without special commands
1948 int usbnet_manage_power(struct usbnet *dev, int on)
1950 dev->intf->needs_remote_wakeup = on;
1953 EXPORT_SYMBOL(usbnet_manage_power);
1955 void usbnet_link_change(struct usbnet *dev, bool link, bool need_reset)
1957 /* update link after link is reseted */
1958 if (link && !need_reset)
1959 netif_carrier_on(dev->net);
1961 netif_carrier_off(dev->net);
1963 if (need_reset && link)
1964 usbnet_defer_kevent(dev, EVENT_LINK_RESET);
1966 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
1968 EXPORT_SYMBOL(usbnet_link_change);
1970 /*-------------------------------------------------------------------------*/
1971 static int __usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
1972 u16 value, u16 index, void *data, u16 size)
1977 netdev_dbg(dev->net, "usbnet_read_cmd cmd=0x%02x reqtype=%02x"
1978 " value=0x%04x index=0x%04x size=%d\n",
1979 cmd, reqtype, value, index, size);
1982 buf = kmalloc(size, GFP_KERNEL);
1987 err = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
1988 cmd, reqtype, value, index, buf, size,
1989 USB_CTRL_GET_TIMEOUT);
1990 if (err > 0 && err <= size) {
1992 memcpy(data, buf, err);
1994 netdev_dbg(dev->net,
1995 "Huh? Data requested but thrown away.\n");
2002 static int __usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
2003 u16 value, u16 index, const void *data,
2009 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
2010 " value=0x%04x index=0x%04x size=%d\n",
2011 cmd, reqtype, value, index, size);
2014 buf = kmemdup(data, size, GFP_KERNEL);
2025 err = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
2026 cmd, reqtype, value, index, buf, size,
2027 USB_CTRL_SET_TIMEOUT);
2035 * The function can't be called inside suspend/resume callback,
2036 * otherwise deadlock will be caused.
2038 int usbnet_read_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
2039 u16 value, u16 index, void *data, u16 size)
2043 if (usb_autopm_get_interface(dev->intf) < 0)
2045 ret = __usbnet_read_cmd(dev, cmd, reqtype, value, index,
2047 usb_autopm_put_interface(dev->intf);
2050 EXPORT_SYMBOL_GPL(usbnet_read_cmd);
2053 * The function can't be called inside suspend/resume callback,
2054 * otherwise deadlock will be caused.
2056 int usbnet_write_cmd(struct usbnet *dev, u8 cmd, u8 reqtype,
2057 u16 value, u16 index, const void *data, u16 size)
2061 if (usb_autopm_get_interface(dev->intf) < 0)
2063 ret = __usbnet_write_cmd(dev, cmd, reqtype, value, index,
2065 usb_autopm_put_interface(dev->intf);
2068 EXPORT_SYMBOL_GPL(usbnet_write_cmd);
2071 * The function can be called inside suspend/resume callback safely
2072 * and should only be called by suspend/resume callback generally.
2074 int usbnet_read_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
2075 u16 value, u16 index, void *data, u16 size)
2077 return __usbnet_read_cmd(dev, cmd, reqtype, value, index,
2080 EXPORT_SYMBOL_GPL(usbnet_read_cmd_nopm);
2083 * The function can be called inside suspend/resume callback safely
2084 * and should only be called by suspend/resume callback generally.
2086 int usbnet_write_cmd_nopm(struct usbnet *dev, u8 cmd, u8 reqtype,
2087 u16 value, u16 index, const void *data,
2090 return __usbnet_write_cmd(dev, cmd, reqtype, value, index,
2093 EXPORT_SYMBOL_GPL(usbnet_write_cmd_nopm);
2095 static void usbnet_async_cmd_cb(struct urb *urb)
2097 struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;
2098 int status = urb->status;
2101 dev_dbg(&urb->dev->dev, "%s failed with %d",
2109 * The caller must make sure that device can't be put into suspend
2110 * state until the control URB completes.
2112 int usbnet_write_cmd_async(struct usbnet *dev, u8 cmd, u8 reqtype,
2113 u16 value, u16 index, const void *data, u16 size)
2115 struct usb_ctrlrequest *req = NULL;
2120 netdev_dbg(dev->net, "usbnet_write_cmd cmd=0x%02x reqtype=%02x"
2121 " value=0x%04x index=0x%04x size=%d\n",
2122 cmd, reqtype, value, index, size);
2124 urb = usb_alloc_urb(0, GFP_ATOMIC);
2129 buf = kmemdup(data, size, GFP_ATOMIC);
2131 netdev_err(dev->net, "Error allocating buffer"
2132 " in %s!\n", __func__);
2137 req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
2141 req->bRequestType = reqtype;
2142 req->bRequest = cmd;
2143 req->wValue = cpu_to_le16(value);
2144 req->wIndex = cpu_to_le16(index);
2145 req->wLength = cpu_to_le16(size);
2147 usb_fill_control_urb(urb, dev->udev,
2148 usb_sndctrlpipe(dev->udev, 0),
2149 (void *)req, buf, size,
2150 usbnet_async_cmd_cb, req);
2151 urb->transfer_flags |= URB_FREE_BUFFER;
2153 err = usb_submit_urb(urb, GFP_ATOMIC);
2155 netdev_err(dev->net, "Error submitting the control"
2156 " message: status=%d\n", err);
2170 EXPORT_SYMBOL_GPL(usbnet_write_cmd_async);
2171 /*-------------------------------------------------------------------------*/
2173 static int __init usbnet_init(void)
2175 /* Compiler should optimize this out. */
2177 FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data));
2179 eth_random_addr(node_id);
2182 module_init(usbnet_init);
2184 static void __exit usbnet_exit(void)
2187 module_exit(usbnet_exit);
2189 MODULE_AUTHOR("David Brownell");
2190 MODULE_DESCRIPTION("USB network driver framework");
2191 MODULE_LICENSE("GPL");