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/ethtool.h>
41 #include <linux/workqueue.h>
42 #include <linux/mii.h>
43 #include <linux/usb.h>
44 #include <linux/usb/usbnet.h>
46 #define DRIVER_VERSION "22-Aug-2005"
49 /*-------------------------------------------------------------------------*/
52 * Nineteen USB 1.1 max size bulk transactions per frame (ms), max.
53 * Several dozen bytes of IPv4 data can fit in two such transactions.
54 * One maximum size Ethernet packet takes twenty four of them.
55 * For high speed, each frame comfortably fits almost 36 max size
56 * Ethernet packets (so queues should be bigger).
58 * REVISIT qlens should be members of 'struct usbnet'; the goal is to
59 * let the USB host controller be busy for 5msec or more before an irq
60 * is required, under load. Jumbograms change the equation.
62 #define RX_MAX_QUEUE_MEMORY (60 * 1518)
63 #define RX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
64 (RX_MAX_QUEUE_MEMORY/(dev)->rx_urb_size) : 4)
65 #define TX_QLEN(dev) (((dev)->udev->speed == USB_SPEED_HIGH) ? \
66 (RX_MAX_QUEUE_MEMORY/(dev)->hard_mtu) : 4)
68 // reawaken network queue this soon after stopping; else watchdog barks
69 #define TX_TIMEOUT_JIFFIES (5*HZ)
71 // throttle rx/tx briefly after some faults, so khubd might disconnect()
72 // us (it polls at HZ/4 usually) before we report too many false errors.
73 #define THROTTLE_JIFFIES (HZ/8)
76 #define UNLINK_TIMEOUT_MS 3
78 /*-------------------------------------------------------------------------*/
80 // randomly generated ethernet address
81 static u8 node_id
[ETH_ALEN
];
83 static const char driver_name
[] = "usbnet";
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 altsetttings.
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 static void intr_complete (struct urb
*urb
);
161 static int init_status (struct usbnet
*dev
, struct usb_interface
*intf
)
168 if (!dev
->driver_info
->status
)
171 pipe
= usb_rcvintpipe (dev
->udev
,
172 dev
->status
->desc
.bEndpointAddress
173 & USB_ENDPOINT_NUMBER_MASK
);
174 maxp
= usb_maxpacket (dev
->udev
, pipe
, 0);
176 /* avoid 1 msec chatter: min 8 msec poll rate */
177 period
= max ((int) dev
->status
->desc
.bInterval
,
178 (dev
->udev
->speed
== USB_SPEED_HIGH
) ? 7 : 3);
180 buf
= kmalloc (maxp
, GFP_KERNEL
);
182 dev
->interrupt
= usb_alloc_urb (0, GFP_KERNEL
);
183 if (!dev
->interrupt
) {
187 usb_fill_int_urb(dev
->interrupt
, dev
->udev
, pipe
,
188 buf
, maxp
, intr_complete
, dev
, period
);
190 "status ep%din, %d bytes period %d\n",
191 usb_pipeendpoint(pipe
), maxp
, period
);
197 /* Passes this packet up the stack, updating its accounting.
198 * Some link protocols batch packets, so their rx_fixup paths
199 * can return clones as well as just modify the original skb.
201 void usbnet_skb_return (struct usbnet
*dev
, struct sk_buff
*skb
)
205 skb
->protocol
= eth_type_trans (skb
, dev
->net
);
206 dev
->stats
.rx_packets
++;
207 dev
->stats
.rx_bytes
+= skb
->len
;
209 if (netif_msg_rx_status (dev
))
210 devdbg (dev
, "< rx, len %zu, type 0x%x",
211 skb
->len
+ sizeof (struct ethhdr
), skb
->protocol
);
212 memset (skb
->cb
, 0, sizeof (struct skb_data
));
213 status
= netif_rx (skb
);
214 if (status
!= NET_RX_SUCCESS
&& netif_msg_rx_err (dev
))
215 devdbg (dev
, "netif_rx status %d", status
);
217 EXPORT_SYMBOL_GPL(usbnet_skb_return
);
220 /*-------------------------------------------------------------------------
222 * Network Device Driver (peer link to "Host Device", from USB host)
224 *-------------------------------------------------------------------------*/
226 static int usbnet_change_mtu (struct net_device
*net
, int new_mtu
)
228 struct usbnet
*dev
= netdev_priv(net
);
229 int ll_mtu
= new_mtu
+ net
->hard_header_len
;
230 int old_hard_mtu
= dev
->hard_mtu
;
231 int old_rx_urb_size
= dev
->rx_urb_size
;
235 // no second zero-length packet read wanted after mtu-sized packets
236 if ((ll_mtu
% dev
->maxpacket
) == 0)
240 dev
->hard_mtu
= net
->mtu
+ net
->hard_header_len
;
241 if (dev
->rx_urb_size
== old_hard_mtu
) {
242 dev
->rx_urb_size
= dev
->hard_mtu
;
243 if (dev
->rx_urb_size
> old_rx_urb_size
)
244 usbnet_unlink_rx_urbs(dev
);
250 /*-------------------------------------------------------------------------*/
252 static struct net_device_stats
*usbnet_get_stats (struct net_device
*net
)
254 struct usbnet
*dev
= netdev_priv(net
);
258 /*-------------------------------------------------------------------------*/
260 /* some LK 2.4 HCDs oopsed if we freed or resubmitted urbs from
261 * completion callbacks. 2.5 should have fixed those bugs...
264 static void defer_bh(struct usbnet
*dev
, struct sk_buff
*skb
, struct sk_buff_head
*list
)
268 spin_lock_irqsave(&list
->lock
, flags
);
269 __skb_unlink(skb
, list
);
270 spin_unlock(&list
->lock
);
271 spin_lock(&dev
->done
.lock
);
272 __skb_queue_tail(&dev
->done
, skb
);
273 if (dev
->done
.qlen
== 1)
274 tasklet_schedule(&dev
->bh
);
275 spin_unlock_irqrestore(&dev
->done
.lock
, flags
);
278 /* some work can't be done in tasklets, so we use keventd
280 * NOTE: annoying asymmetry: if it's active, schedule_work() fails,
281 * but tasklet_schedule() doesn't. hope the failure is rare.
283 void usbnet_defer_kevent (struct usbnet
*dev
, int work
)
285 set_bit (work
, &dev
->flags
);
286 if (!schedule_work (&dev
->kevent
))
287 deverr (dev
, "kevent %d may have been dropped", work
);
289 devdbg (dev
, "kevent %d scheduled", work
);
291 EXPORT_SYMBOL_GPL(usbnet_defer_kevent
);
293 /*-------------------------------------------------------------------------*/
295 static void rx_complete (struct urb
*urb
);
297 static void rx_submit (struct usbnet
*dev
, struct urb
*urb
, gfp_t flags
)
300 struct skb_data
*entry
;
302 unsigned long lockflags
;
303 size_t size
= dev
->rx_urb_size
;
305 if ((skb
= alloc_skb (size
+ NET_IP_ALIGN
, flags
)) == NULL
) {
306 if (netif_msg_rx_err (dev
))
307 devdbg (dev
, "no rx skb");
308 usbnet_defer_kevent (dev
, EVENT_RX_MEMORY
);
312 skb_reserve (skb
, NET_IP_ALIGN
);
314 entry
= (struct skb_data
*) skb
->cb
;
317 entry
->state
= rx_start
;
320 usb_fill_bulk_urb (urb
, dev
->udev
, dev
->in
,
321 skb
->data
, size
, rx_complete
, skb
);
323 spin_lock_irqsave (&dev
->rxq
.lock
, lockflags
);
325 if (netif_running (dev
->net
)
326 && netif_device_present (dev
->net
)
327 && !test_bit (EVENT_RX_HALT
, &dev
->flags
)) {
328 switch (retval
= usb_submit_urb (urb
, GFP_ATOMIC
)) {
330 usbnet_defer_kevent (dev
, EVENT_RX_HALT
);
333 usbnet_defer_kevent (dev
, EVENT_RX_MEMORY
);
336 if (netif_msg_ifdown (dev
))
337 devdbg (dev
, "device gone");
338 netif_device_detach (dev
->net
);
341 if (netif_msg_rx_err (dev
))
342 devdbg (dev
, "rx submit, %d", retval
);
343 tasklet_schedule (&dev
->bh
);
346 __skb_queue_tail (&dev
->rxq
, skb
);
349 if (netif_msg_ifdown (dev
))
350 devdbg (dev
, "rx: stopped");
353 spin_unlock_irqrestore (&dev
->rxq
.lock
, lockflags
);
355 dev_kfree_skb_any (skb
);
361 /*-------------------------------------------------------------------------*/
363 static inline void rx_process (struct usbnet
*dev
, struct sk_buff
*skb
)
365 if (dev
->driver_info
->rx_fixup
366 && !dev
->driver_info
->rx_fixup (dev
, skb
))
368 // else network stack removes extra byte if we forced a short packet
371 usbnet_skb_return (dev
, skb
);
373 if (netif_msg_rx_err (dev
))
374 devdbg (dev
, "drop");
376 dev
->stats
.rx_errors
++;
377 skb_queue_tail (&dev
->done
, skb
);
381 /*-------------------------------------------------------------------------*/
383 static void rx_complete (struct urb
*urb
)
385 struct sk_buff
*skb
= (struct sk_buff
*) urb
->context
;
386 struct skb_data
*entry
= (struct skb_data
*) skb
->cb
;
387 struct usbnet
*dev
= entry
->dev
;
388 int urb_status
= urb
->status
;
390 skb_put (skb
, urb
->actual_length
);
391 entry
->state
= rx_done
;
394 switch (urb_status
) {
397 if (skb
->len
< dev
->net
->hard_header_len
) {
398 entry
->state
= rx_cleanup
;
399 dev
->stats
.rx_errors
++;
400 dev
->stats
.rx_length_errors
++;
401 if (netif_msg_rx_err (dev
))
402 devdbg (dev
, "rx length %d", skb
->len
);
406 /* stalls need manual reset. this is rare ... except that
407 * when going through USB 2.0 TTs, unplug appears this way.
408 * we avoid the highspeed version of the ETIMEOUT/EILSEQ
409 * storm, recovering as needed.
412 dev
->stats
.rx_errors
++;
413 usbnet_defer_kevent (dev
, EVENT_RX_HALT
);
416 /* software-driven interface shutdown */
417 case -ECONNRESET
: /* async unlink */
418 case -ESHUTDOWN
: /* hardware gone */
419 if (netif_msg_ifdown (dev
))
420 devdbg (dev
, "rx shutdown, code %d", urb_status
);
423 /* we get controller i/o faults during khubd disconnect() delays.
424 * throttle down resubmits, to avoid log floods; just temporarily,
425 * so we still recover when the fault isn't a khubd delay.
430 dev
->stats
.rx_errors
++;
431 if (!timer_pending (&dev
->delay
)) {
432 mod_timer (&dev
->delay
, jiffies
+ THROTTLE_JIFFIES
);
433 if (netif_msg_link (dev
))
434 devdbg (dev
, "rx throttle %d", urb_status
);
437 entry
->state
= rx_cleanup
;
442 /* data overrun ... flush fifo? */
444 dev
->stats
.rx_over_errors
++;
448 entry
->state
= rx_cleanup
;
449 dev
->stats
.rx_errors
++;
450 if (netif_msg_rx_err (dev
))
451 devdbg (dev
, "rx status %d", urb_status
);
455 defer_bh(dev
, skb
, &dev
->rxq
);
458 if (netif_running (dev
->net
)
459 && !test_bit (EVENT_RX_HALT
, &dev
->flags
)) {
460 rx_submit (dev
, urb
, GFP_ATOMIC
);
465 if (netif_msg_rx_err (dev
))
466 devdbg (dev
, "no read resubmitted");
469 static void intr_complete (struct urb
*urb
)
471 struct usbnet
*dev
= urb
->context
;
472 int status
= urb
->status
;
477 dev
->driver_info
->status(dev
, urb
);
480 /* software-driven interface shutdown */
481 case -ENOENT
: /* urb killed */
482 case -ESHUTDOWN
: /* hardware gone */
483 if (netif_msg_ifdown (dev
))
484 devdbg (dev
, "intr shutdown, code %d", status
);
487 /* NOTE: not throttling like RX/TX, since this endpoint
488 * already polls infrequently
491 devdbg (dev
, "intr status %d", status
);
495 if (!netif_running (dev
->net
))
498 memset(urb
->transfer_buffer
, 0, urb
->transfer_buffer_length
);
499 status
= usb_submit_urb (urb
, GFP_ATOMIC
);
500 if (status
!= 0 && netif_msg_timer (dev
))
501 deverr(dev
, "intr resubmit --> %d", status
);
504 /*-------------------------------------------------------------------------*/
506 // unlink pending rx/tx; completion handlers do all other cleanup
508 static int unlink_urbs (struct usbnet
*dev
, struct sk_buff_head
*q
)
511 struct sk_buff
*skb
, *skbnext
;
514 spin_lock_irqsave (&q
->lock
, flags
);
515 skb_queue_walk_safe(q
, skb
, skbnext
) {
516 struct skb_data
*entry
;
520 entry
= (struct skb_data
*) skb
->cb
;
523 // during some PM-driven resume scenarios,
524 // these (async) unlinks complete immediately
525 retval
= usb_unlink_urb (urb
);
526 if (retval
!= -EINPROGRESS
&& retval
!= 0)
527 devdbg (dev
, "unlink urb err, %d", retval
);
531 spin_unlock_irqrestore (&q
->lock
, flags
);
535 // Flush all pending rx urbs
536 // minidrivers may need to do this when the MTU changes
538 void usbnet_unlink_rx_urbs(struct usbnet
*dev
)
540 if (netif_running(dev
->net
)) {
541 (void) unlink_urbs (dev
, &dev
->rxq
);
542 tasklet_schedule(&dev
->bh
);
545 EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs
);
547 /*-------------------------------------------------------------------------*/
549 // precondition: never called in_interrupt
551 static int usbnet_stop (struct net_device
*net
)
553 struct usbnet
*dev
= netdev_priv(net
);
555 DECLARE_WAIT_QUEUE_HEAD_ONSTACK (unlink_wakeup
);
556 DECLARE_WAITQUEUE (wait
, current
);
558 netif_stop_queue (net
);
560 if (netif_msg_ifdown (dev
))
561 devinfo (dev
, "stop stats: rx/tx %ld/%ld, errs %ld/%ld",
562 dev
->stats
.rx_packets
, dev
->stats
.tx_packets
,
563 dev
->stats
.rx_errors
, dev
->stats
.tx_errors
566 // ensure there are no more active urbs
567 add_wait_queue (&unlink_wakeup
, &wait
);
568 dev
->wait
= &unlink_wakeup
;
569 temp
= unlink_urbs (dev
, &dev
->txq
) + unlink_urbs (dev
, &dev
->rxq
);
571 // maybe wait for deletions to finish.
572 while (!skb_queue_empty(&dev
->rxq
)
573 && !skb_queue_empty(&dev
->txq
)
574 && !skb_queue_empty(&dev
->done
)) {
575 msleep(UNLINK_TIMEOUT_MS
);
576 if (netif_msg_ifdown (dev
))
577 devdbg (dev
, "waited for %d urb completions", temp
);
580 remove_wait_queue (&unlink_wakeup
, &wait
);
582 usb_kill_urb(dev
->interrupt
);
584 /* deferred work (task, timer, softirq) must also stop.
585 * can't flush_scheduled_work() until we drop rtnl (later),
586 * else workers could deadlock; so make workers a NOP.
589 del_timer_sync (&dev
->delay
);
590 tasklet_kill (&dev
->bh
);
591 usb_autopm_put_interface(dev
->intf
);
596 /*-------------------------------------------------------------------------*/
598 // posts reads, and enables write queuing
600 // precondition: never called in_interrupt
602 static int usbnet_open (struct net_device
*net
)
604 struct usbnet
*dev
= netdev_priv(net
);
606 struct driver_info
*info
= dev
->driver_info
;
608 if ((retval
= usb_autopm_get_interface(dev
->intf
)) < 0) {
609 if (netif_msg_ifup (dev
))
611 "resumption fail (%d) usbnet usb-%s-%s, %s",
613 dev
->udev
->bus
->bus_name
, dev
->udev
->devpath
,
618 // put into "known safe" state
619 if (info
->reset
&& (retval
= info
->reset (dev
)) < 0) {
620 if (netif_msg_ifup (dev
))
622 "open reset fail (%d) usbnet usb-%s-%s, %s",
624 dev
->udev
->bus
->bus_name
, dev
->udev
->devpath
,
629 // insist peer be connected
630 if (info
->check_connect
&& (retval
= info
->check_connect (dev
)) < 0) {
631 if (netif_msg_ifup (dev
))
632 devdbg (dev
, "can't open; %d", retval
);
636 /* start any status interrupt transfer */
637 if (dev
->interrupt
) {
638 retval
= usb_submit_urb (dev
->interrupt
, GFP_KERNEL
);
640 if (netif_msg_ifup (dev
))
641 deverr (dev
, "intr submit %d", retval
);
646 netif_start_queue (net
);
647 if (netif_msg_ifup (dev
)) {
650 if (dev
->driver_info
->flags
& FLAG_FRAMING_NC
)
652 else if (dev
->driver_info
->flags
& FLAG_FRAMING_GL
)
654 else if (dev
->driver_info
->flags
& FLAG_FRAMING_Z
)
656 else if (dev
->driver_info
->flags
& FLAG_FRAMING_RN
)
658 else if (dev
->driver_info
->flags
& FLAG_FRAMING_AX
)
663 devinfo (dev
, "open: enable queueing "
664 "(rx %d, tx %d) mtu %d %s framing",
665 (int)RX_QLEN (dev
), (int)TX_QLEN (dev
), dev
->net
->mtu
,
669 // delay posting reads until we're fully open
670 tasklet_schedule (&dev
->bh
);
673 usb_autopm_put_interface(dev
->intf
);
678 /*-------------------------------------------------------------------------*/
680 /* ethtool methods; minidrivers may need to add some more, but
681 * they'll probably want to use this base set.
684 int usbnet_get_settings (struct net_device
*net
, struct ethtool_cmd
*cmd
)
686 struct usbnet
*dev
= netdev_priv(net
);
688 if (!dev
->mii
.mdio_read
)
691 return mii_ethtool_gset(&dev
->mii
, cmd
);
693 EXPORT_SYMBOL_GPL(usbnet_get_settings
);
695 int usbnet_set_settings (struct net_device
*net
, struct ethtool_cmd
*cmd
)
697 struct usbnet
*dev
= netdev_priv(net
);
700 if (!dev
->mii
.mdio_write
)
703 retval
= mii_ethtool_sset(&dev
->mii
, cmd
);
705 /* link speed/duplex might have changed */
706 if (dev
->driver_info
->link_reset
)
707 dev
->driver_info
->link_reset(dev
);
712 EXPORT_SYMBOL_GPL(usbnet_set_settings
);
714 u32
usbnet_get_link (struct net_device
*net
)
716 struct usbnet
*dev
= netdev_priv(net
);
718 /* If a check_connect is defined, return its result */
719 if (dev
->driver_info
->check_connect
)
720 return dev
->driver_info
->check_connect (dev
) == 0;
722 /* if the device has mii operations, use those */
723 if (dev
->mii
.mdio_read
)
724 return mii_link_ok(&dev
->mii
);
726 /* Otherwise, say we're up (to avoid breaking scripts) */
729 EXPORT_SYMBOL_GPL(usbnet_get_link
);
731 int usbnet_nway_reset(struct net_device
*net
)
733 struct usbnet
*dev
= netdev_priv(net
);
735 if (!dev
->mii
.mdio_write
)
738 return mii_nway_restart(&dev
->mii
);
740 EXPORT_SYMBOL_GPL(usbnet_nway_reset
);
742 void usbnet_get_drvinfo (struct net_device
*net
, struct ethtool_drvinfo
*info
)
744 struct usbnet
*dev
= netdev_priv(net
);
746 strncpy (info
->driver
, dev
->driver_name
, sizeof info
->driver
);
747 strncpy (info
->version
, DRIVER_VERSION
, sizeof info
->version
);
748 strncpy (info
->fw_version
, dev
->driver_info
->description
,
749 sizeof info
->fw_version
);
750 usb_make_path (dev
->udev
, info
->bus_info
, sizeof info
->bus_info
);
752 EXPORT_SYMBOL_GPL(usbnet_get_drvinfo
);
754 u32
usbnet_get_msglevel (struct net_device
*net
)
756 struct usbnet
*dev
= netdev_priv(net
);
758 return dev
->msg_enable
;
760 EXPORT_SYMBOL_GPL(usbnet_get_msglevel
);
762 void usbnet_set_msglevel (struct net_device
*net
, u32 level
)
764 struct usbnet
*dev
= netdev_priv(net
);
766 dev
->msg_enable
= level
;
768 EXPORT_SYMBOL_GPL(usbnet_set_msglevel
);
770 /* drivers may override default ethtool_ops in their bind() routine */
771 static struct ethtool_ops usbnet_ethtool_ops
= {
772 .get_settings
= usbnet_get_settings
,
773 .set_settings
= usbnet_set_settings
,
774 .get_link
= usbnet_get_link
,
775 .nway_reset
= usbnet_nway_reset
,
776 .get_drvinfo
= usbnet_get_drvinfo
,
777 .get_msglevel
= usbnet_get_msglevel
,
778 .set_msglevel
= usbnet_set_msglevel
,
781 /*-------------------------------------------------------------------------*/
783 /* work that cannot be done in interrupt context uses keventd.
785 * NOTE: with 2.5 we could do more of this using completion callbacks,
786 * especially now that control transfers can be queued.
789 kevent (struct work_struct
*work
)
792 container_of(work
, struct usbnet
, kevent
);
795 /* usb_clear_halt() needs a thread context */
796 if (test_bit (EVENT_TX_HALT
, &dev
->flags
)) {
797 unlink_urbs (dev
, &dev
->txq
);
798 status
= usb_clear_halt (dev
->udev
, dev
->out
);
801 && status
!= -ESHUTDOWN
) {
802 if (netif_msg_tx_err (dev
))
803 deverr (dev
, "can't clear tx halt, status %d",
806 clear_bit (EVENT_TX_HALT
, &dev
->flags
);
807 if (status
!= -ESHUTDOWN
)
808 netif_wake_queue (dev
->net
);
811 if (test_bit (EVENT_RX_HALT
, &dev
->flags
)) {
812 unlink_urbs (dev
, &dev
->rxq
);
813 status
= usb_clear_halt (dev
->udev
, dev
->in
);
816 && status
!= -ESHUTDOWN
) {
817 if (netif_msg_rx_err (dev
))
818 deverr (dev
, "can't clear rx halt, status %d",
821 clear_bit (EVENT_RX_HALT
, &dev
->flags
);
822 tasklet_schedule (&dev
->bh
);
826 /* tasklet could resubmit itself forever if memory is tight */
827 if (test_bit (EVENT_RX_MEMORY
, &dev
->flags
)) {
828 struct urb
*urb
= NULL
;
830 if (netif_running (dev
->net
))
831 urb
= usb_alloc_urb (0, GFP_KERNEL
);
833 clear_bit (EVENT_RX_MEMORY
, &dev
->flags
);
835 clear_bit (EVENT_RX_MEMORY
, &dev
->flags
);
836 rx_submit (dev
, urb
, GFP_KERNEL
);
837 tasklet_schedule (&dev
->bh
);
841 if (test_bit (EVENT_LINK_RESET
, &dev
->flags
)) {
842 struct driver_info
*info
= dev
->driver_info
;
845 clear_bit (EVENT_LINK_RESET
, &dev
->flags
);
846 if(info
->link_reset
&& (retval
= info
->link_reset(dev
)) < 0) {
847 devinfo(dev
, "link reset failed (%d) usbnet usb-%s-%s, %s",
849 dev
->udev
->bus
->bus_name
, dev
->udev
->devpath
,
855 devdbg (dev
, "kevent done, flags = 0x%lx",
859 /*-------------------------------------------------------------------------*/
861 static void tx_complete (struct urb
*urb
)
863 struct sk_buff
*skb
= (struct sk_buff
*) urb
->context
;
864 struct skb_data
*entry
= (struct skb_data
*) skb
->cb
;
865 struct usbnet
*dev
= entry
->dev
;
867 if (urb
->status
== 0) {
868 dev
->stats
.tx_packets
++;
869 dev
->stats
.tx_bytes
+= entry
->length
;
871 dev
->stats
.tx_errors
++;
873 switch (urb
->status
) {
875 usbnet_defer_kevent (dev
, EVENT_TX_HALT
);
878 /* software-driven interface shutdown */
879 case -ECONNRESET
: // async unlink
880 case -ESHUTDOWN
: // hardware gone
883 // like rx, tx gets controller i/o faults during khubd delays
884 // and so it uses the same throttling mechanism.
888 if (!timer_pending (&dev
->delay
)) {
889 mod_timer (&dev
->delay
,
890 jiffies
+ THROTTLE_JIFFIES
);
891 if (netif_msg_link (dev
))
892 devdbg (dev
, "tx throttle %d",
895 netif_stop_queue (dev
->net
);
898 if (netif_msg_tx_err (dev
))
899 devdbg (dev
, "tx err %d", entry
->urb
->status
);
905 entry
->state
= tx_done
;
906 defer_bh(dev
, skb
, &dev
->txq
);
909 /*-------------------------------------------------------------------------*/
911 static void usbnet_tx_timeout (struct net_device
*net
)
913 struct usbnet
*dev
= netdev_priv(net
);
915 unlink_urbs (dev
, &dev
->txq
);
916 tasklet_schedule (&dev
->bh
);
918 // FIXME: device recovery -- reset?
921 /*-------------------------------------------------------------------------*/
923 static int usbnet_start_xmit (struct sk_buff
*skb
, struct net_device
*net
)
925 struct usbnet
*dev
= netdev_priv(net
);
927 int retval
= NET_XMIT_SUCCESS
;
928 struct urb
*urb
= NULL
;
929 struct skb_data
*entry
;
930 struct driver_info
*info
= dev
->driver_info
;
933 // some devices want funky USB-level framing, for
934 // win32 driver (usually) and/or hardware quirks
935 if (info
->tx_fixup
) {
936 skb
= info
->tx_fixup (dev
, skb
, GFP_ATOMIC
);
938 if (netif_msg_tx_err (dev
))
939 devdbg (dev
, "can't tx_fixup skb");
945 if (!(urb
= usb_alloc_urb (0, GFP_ATOMIC
))) {
946 if (netif_msg_tx_err (dev
))
947 devdbg (dev
, "no urb");
951 entry
= (struct skb_data
*) skb
->cb
;
954 entry
->state
= tx_start
;
955 entry
->length
= length
;
957 usb_fill_bulk_urb (urb
, dev
->udev
, dev
->out
,
958 skb
->data
, skb
->len
, tx_complete
, skb
);
960 /* don't assume the hardware handles USB_ZERO_PACKET
961 * NOTE: strictly conforming cdc-ether devices should expect
962 * the ZLP here, but ignore the one-byte packet.
964 if ((length
% dev
->maxpacket
) == 0) {
965 urb
->transfer_buffer_length
++;
966 if (skb_tailroom(skb
)) {
967 skb
->data
[skb
->len
] = 0;
972 spin_lock_irqsave (&dev
->txq
.lock
, flags
);
974 switch ((retval
= usb_submit_urb (urb
, GFP_ATOMIC
))) {
976 netif_stop_queue (net
);
977 usbnet_defer_kevent (dev
, EVENT_TX_HALT
);
980 if (netif_msg_tx_err (dev
))
981 devdbg (dev
, "tx: submit urb err %d", retval
);
984 net
->trans_start
= jiffies
;
985 __skb_queue_tail (&dev
->txq
, skb
);
986 if (dev
->txq
.qlen
>= TX_QLEN (dev
))
987 netif_stop_queue (net
);
989 spin_unlock_irqrestore (&dev
->txq
.lock
, flags
);
992 if (netif_msg_tx_err (dev
))
993 devdbg (dev
, "drop, code %d", retval
);
995 retval
= NET_XMIT_SUCCESS
;
996 dev
->stats
.tx_dropped
++;
998 dev_kfree_skb_any (skb
);
1000 } else if (netif_msg_tx_queued (dev
)) {
1001 devdbg (dev
, "> tx, len %d, type 0x%x",
1002 length
, skb
->protocol
);
1008 /*-------------------------------------------------------------------------*/
1010 // tasklet (work deferred from completions, in_irq) or timer
1012 static void usbnet_bh (unsigned long param
)
1014 struct usbnet
*dev
= (struct usbnet
*) param
;
1015 struct sk_buff
*skb
;
1016 struct skb_data
*entry
;
1018 while ((skb
= skb_dequeue (&dev
->done
))) {
1019 entry
= (struct skb_data
*) skb
->cb
;
1020 switch (entry
->state
) {
1022 entry
->state
= rx_cleanup
;
1023 rx_process (dev
, skb
);
1027 usb_free_urb (entry
->urb
);
1028 dev_kfree_skb (skb
);
1031 devdbg (dev
, "bogus skb state %d", entry
->state
);
1035 // waiting for all pending urbs to complete?
1037 if ((dev
->txq
.qlen
+ dev
->rxq
.qlen
+ dev
->done
.qlen
) == 0) {
1038 wake_up (dev
->wait
);
1041 // or are we maybe short a few urbs?
1042 } else if (netif_running (dev
->net
)
1043 && netif_device_present (dev
->net
)
1044 && !timer_pending (&dev
->delay
)
1045 && !test_bit (EVENT_RX_HALT
, &dev
->flags
)) {
1046 int temp
= dev
->rxq
.qlen
;
1047 int qlen
= RX_QLEN (dev
);
1053 // don't refill the queue all at once
1054 for (i
= 0; i
< 10 && dev
->rxq
.qlen
< qlen
; i
++) {
1055 urb
= usb_alloc_urb (0, GFP_ATOMIC
);
1057 rx_submit (dev
, urb
, GFP_ATOMIC
);
1059 if (temp
!= dev
->rxq
.qlen
&& netif_msg_link (dev
))
1060 devdbg (dev
, "rxqlen %d --> %d",
1061 temp
, dev
->rxq
.qlen
);
1062 if (dev
->rxq
.qlen
< qlen
)
1063 tasklet_schedule (&dev
->bh
);
1065 if (dev
->txq
.qlen
< TX_QLEN (dev
))
1066 netif_wake_queue (dev
->net
);
1072 /*-------------------------------------------------------------------------
1074 * USB Device Driver support
1076 *-------------------------------------------------------------------------*/
1078 // precondition: never called in_interrupt
1080 void usbnet_disconnect (struct usb_interface
*intf
)
1083 struct usb_device
*xdev
;
1084 struct net_device
*net
;
1086 dev
= usb_get_intfdata(intf
);
1087 usb_set_intfdata(intf
, NULL
);
1091 xdev
= interface_to_usbdev (intf
);
1093 if (netif_msg_probe (dev
))
1094 devinfo (dev
, "unregister '%s' usb-%s-%s, %s",
1095 intf
->dev
.driver
->name
,
1096 xdev
->bus
->bus_name
, xdev
->devpath
,
1097 dev
->driver_info
->description
);
1100 unregister_netdev (net
);
1102 /* we don't hold rtnl here ... */
1103 flush_scheduled_work ();
1105 if (dev
->driver_info
->unbind
)
1106 dev
->driver_info
->unbind (dev
, intf
);
1111 EXPORT_SYMBOL_GPL(usbnet_disconnect
);
1114 /*-------------------------------------------------------------------------*/
1116 // precondition: never called in_interrupt
1119 usbnet_probe (struct usb_interface
*udev
, const struct usb_device_id
*prod
)
1122 struct net_device
*net
;
1123 struct usb_host_interface
*interface
;
1124 struct driver_info
*info
;
1125 struct usb_device
*xdev
;
1129 name
= udev
->dev
.driver
->name
;
1130 info
= (struct driver_info
*) prod
->driver_info
;
1132 dev_dbg (&udev
->dev
, "blacklisted by %s\n", name
);
1135 xdev
= interface_to_usbdev (udev
);
1136 interface
= udev
->cur_altsetting
;
1142 // set up our own records
1143 net
= alloc_etherdev(sizeof(*dev
));
1145 dbg ("can't kmalloc dev");
1149 dev
= netdev_priv(net
);
1152 dev
->driver_info
= info
;
1153 dev
->driver_name
= name
;
1154 dev
->msg_enable
= netif_msg_init (msg_level
, NETIF_MSG_DRV
1155 | NETIF_MSG_PROBE
| NETIF_MSG_LINK
);
1156 skb_queue_head_init (&dev
->rxq
);
1157 skb_queue_head_init (&dev
->txq
);
1158 skb_queue_head_init (&dev
->done
);
1159 dev
->bh
.func
= usbnet_bh
;
1160 dev
->bh
.data
= (unsigned long) dev
;
1161 INIT_WORK (&dev
->kevent
, kevent
);
1162 dev
->delay
.function
= usbnet_bh
;
1163 dev
->delay
.data
= (unsigned long) dev
;
1164 init_timer (&dev
->delay
);
1165 mutex_init (&dev
->phy_mutex
);
1168 strcpy (net
->name
, "usb%d");
1169 memcpy (net
->dev_addr
, node_id
, sizeof node_id
);
1171 /* rx and tx sides can use different message sizes;
1172 * bind() should set rx_urb_size in that case.
1174 dev
->hard_mtu
= net
->mtu
+ net
->hard_header_len
;
1176 // dma_supported() is deeply broken on almost all architectures
1177 // possible with some EHCI controllers
1178 if (dma_supported (&udev
->dev
, DMA_64BIT_MASK
))
1179 net
->features
|= NETIF_F_HIGHDMA
;
1182 net
->change_mtu
= usbnet_change_mtu
;
1183 net
->get_stats
= usbnet_get_stats
;
1184 net
->hard_start_xmit
= usbnet_start_xmit
;
1185 net
->open
= usbnet_open
;
1186 net
->stop
= usbnet_stop
;
1187 net
->watchdog_timeo
= TX_TIMEOUT_JIFFIES
;
1188 net
->tx_timeout
= usbnet_tx_timeout
;
1189 net
->ethtool_ops
= &usbnet_ethtool_ops
;
1191 // allow device-specific bind/init procedures
1192 // NOTE net->name still not usable ...
1194 status
= info
->bind (dev
, udev
);
1198 // heuristic: "usb%d" for links we know are two-host,
1199 // else "eth%d" when there's reasonable doubt. userspace
1200 // can rename the link if it knows better.
1201 if ((dev
->driver_info
->flags
& FLAG_ETHER
) != 0
1202 && (net
->dev_addr
[0] & 0x02) == 0)
1203 strcpy (net
->name
, "eth%d");
1204 /* WLAN devices should always be named "wlan%d" */
1205 if ((dev
->driver_info
->flags
& FLAG_WLAN
) != 0)
1206 strcpy(net
->name
, "wlan%d");
1208 /* maybe the remote can't receive an Ethernet MTU */
1209 if (net
->mtu
> (dev
->hard_mtu
- net
->hard_header_len
))
1210 net
->mtu
= dev
->hard_mtu
- net
->hard_header_len
;
1211 } else if (!info
->in
|| !info
->out
)
1212 status
= usbnet_get_endpoints (dev
, udev
);
1214 dev
->in
= usb_rcvbulkpipe (xdev
, info
->in
);
1215 dev
->out
= usb_sndbulkpipe (xdev
, info
->out
);
1216 if (!(info
->flags
& FLAG_NO_SETINT
))
1217 status
= usb_set_interface (xdev
,
1218 interface
->desc
.bInterfaceNumber
,
1219 interface
->desc
.bAlternateSetting
);
1224 if (status
>= 0 && dev
->status
)
1225 status
= init_status (dev
, udev
);
1229 if (!dev
->rx_urb_size
)
1230 dev
->rx_urb_size
= dev
->hard_mtu
;
1231 dev
->maxpacket
= usb_maxpacket (dev
->udev
, dev
->out
, 1);
1233 SET_NETDEV_DEV(net
, &udev
->dev
);
1234 status
= register_netdev (net
);
1237 if (netif_msg_probe (dev
))
1238 devinfo (dev
, "register '%s' at usb-%s-%s, %s, %pM",
1239 udev
->dev
.driver
->name
,
1240 xdev
->bus
->bus_name
, xdev
->devpath
,
1241 dev
->driver_info
->description
,
1244 // ok, it's ready to go.
1245 usb_set_intfdata (udev
, dev
);
1247 // start as if the link is up
1248 netif_device_attach (net
);
1254 info
->unbind (dev
, udev
);
1261 EXPORT_SYMBOL_GPL(usbnet_probe
);
1263 /*-------------------------------------------------------------------------*/
1266 * suspend the whole driver as soon as the first interface is suspended
1267 * resume only when the last interface is resumed
1270 int usbnet_suspend (struct usb_interface
*intf
, pm_message_t message
)
1272 struct usbnet
*dev
= usb_get_intfdata(intf
);
1274 if (!dev
->suspend_count
++) {
1276 * accelerate emptying of the rx and queues, to avoid
1277 * having everything error out.
1279 netif_device_detach (dev
->net
);
1280 (void) unlink_urbs (dev
, &dev
->rxq
);
1281 (void) unlink_urbs (dev
, &dev
->txq
);
1283 * reattach so runtime management can use and
1286 netif_device_attach (dev
->net
);
1290 EXPORT_SYMBOL_GPL(usbnet_suspend
);
1292 int usbnet_resume (struct usb_interface
*intf
)
1294 struct usbnet
*dev
= usb_get_intfdata(intf
);
1296 if (!--dev
->suspend_count
)
1297 tasklet_schedule (&dev
->bh
);
1301 EXPORT_SYMBOL_GPL(usbnet_resume
);
1304 /*-------------------------------------------------------------------------*/
1306 static int __init
usbnet_init(void)
1308 /* compiler should optimize this out */
1309 BUILD_BUG_ON (sizeof (((struct sk_buff
*)0)->cb
)
1310 < sizeof (struct skb_data
));
1312 random_ether_addr(node_id
);
1315 module_init(usbnet_init
);
1317 static void __exit
usbnet_exit(void)
1320 module_exit(usbnet_exit
);
1322 MODULE_AUTHOR("David Brownell");
1323 MODULE_DESCRIPTION("USB network driver framework");
1324 MODULE_LICENSE("GPL");