2 * u_ether.c -- Ethernet-over-USB link layer utilities for Gadget stack
4 * Copyright (C) 2003-2005,2008 David Brownell
5 * Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger
6 * Copyright (C) 2008 Nokia Corporation
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
14 /* #define VERBOSE_DEBUG */
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/gfp.h>
19 #include <linux/device.h>
20 #include <linux/ctype.h>
21 #include <linux/etherdevice.h>
22 #include <linux/ethtool.h>
23 #include <linux/if_vlan.h>
29 * This component encapsulates the Ethernet link glue needed to provide
30 * one (!) network link through the USB gadget stack, normally "usb0".
32 * The control and data models are handled by the function driver which
33 * connects to this code; such as CDC Ethernet (ECM or EEM),
34 * "CDC Subset", or RNDIS. That includes all descriptor and endpoint
37 * Link level addressing is handled by this component using module
38 * parameters; if no such parameters are provided, random link level
39 * addresses are used. Each end of the link uses one address. The
40 * host end address is exported in various ways, and is often recorded
41 * in configuration databases.
43 * The driver which assembles each configuration using such a link is
44 * responsible for ensuring that each configuration includes at most one
45 * instance of is network link. (The network layer provides ways for
46 * this single "physical" link to be used by multiple virtual links.)
49 #define UETH__VERSION "29-May-2008"
51 /* Experiments show that both Linux and Windows hosts allow up to 16k
52 * frame sizes. Set the max size to 15k+52 to prevent allocating 32k
53 * blocks and still have efficient handling. */
54 #define GETHER_MAX_ETH_FRAME_LEN 15412
57 /* lock is held while accessing port_usb
60 struct gether *port_usb;
62 struct net_device *net;
63 struct usb_gadget *gadget;
65 spinlock_t req_lock; /* guard {rx,tx}_reqs */
66 struct list_head tx_reqs, rx_reqs;
69 struct sk_buff_head rx_frames;
74 struct sk_buff *(*wrap)(struct gether *, struct sk_buff *skb);
75 int (*unwrap)(struct gether *,
77 struct sk_buff_head *list);
79 struct work_struct work;
82 #define WORK_RX_MEMORY 0
86 u8 host_mac[ETH_ALEN];
90 /*-------------------------------------------------------------------------*/
92 #define RX_EXTRA 20 /* bytes guarding against rx overflows */
94 #define DEFAULT_QLEN 2 /* double buffering by default */
96 /* for dual-speed hardware, use deeper queues at high/super speed */
97 static inline int qlen(struct usb_gadget *gadget, unsigned qmult)
99 if (gadget_is_dualspeed(gadget) && (gadget->speed == USB_SPEED_HIGH ||
100 gadget->speed == USB_SPEED_SUPER))
101 return qmult * DEFAULT_QLEN;
106 /*-------------------------------------------------------------------------*/
108 /* REVISIT there must be a better way than having two sets
117 #define xprintk(d, level, fmt, args...) \
118 printk(level "%s: " fmt , (d)->net->name , ## args)
122 #define DBG(dev, fmt, args...) \
123 xprintk(dev , KERN_DEBUG , fmt , ## args)
125 #define DBG(dev, fmt, args...) \
132 #define VDBG(dev, fmt, args...) \
136 #define ERROR(dev, fmt, args...) \
137 xprintk(dev , KERN_ERR , fmt , ## args)
138 #define INFO(dev, fmt, args...) \
139 xprintk(dev , KERN_INFO , fmt , ## args)
141 /*-------------------------------------------------------------------------*/
143 /* NETWORK DRIVER HOOKUP (to the layer above this driver) */
145 static int ueth_change_mtu(struct net_device *net, int new_mtu)
147 if (new_mtu <= ETH_HLEN || new_mtu > GETHER_MAX_ETH_FRAME_LEN)
154 static void eth_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *p)
156 struct eth_dev *dev = netdev_priv(net);
158 strlcpy(p->driver, "g_ether", sizeof(p->driver));
159 strlcpy(p->version, UETH__VERSION, sizeof(p->version));
160 strlcpy(p->fw_version, dev->gadget->name, sizeof(p->fw_version));
161 strlcpy(p->bus_info, dev_name(&dev->gadget->dev), sizeof(p->bus_info));
164 /* REVISIT can also support:
165 * - WOL (by tracking suspends and issuing remote wakeup)
166 * - msglevel (implies updated messaging)
167 * - ... probably more ethtool ops
170 static const struct ethtool_ops ops = {
171 .get_drvinfo = eth_get_drvinfo,
172 .get_link = ethtool_op_get_link,
175 static void defer_kevent(struct eth_dev *dev, int flag)
177 if (test_and_set_bit(flag, &dev->todo))
179 if (!schedule_work(&dev->work))
180 ERROR(dev, "kevent %d may have been dropped\n", flag);
182 DBG(dev, "kevent %d scheduled\n", flag);
185 static void rx_complete(struct usb_ep *ep, struct usb_request *req);
188 rx_submit(struct eth_dev *dev, struct usb_request *req, gfp_t gfp_flags)
191 int retval = -ENOMEM;
196 spin_lock_irqsave(&dev->lock, flags);
198 out = dev->port_usb->out_ep;
201 spin_unlock_irqrestore(&dev->lock, flags);
207 /* Padding up to RX_EXTRA handles minor disagreements with host.
208 * Normally we use the USB "terminate on short read" convention;
209 * so allow up to (N*maxpacket), since that memory is normally
210 * already allocated. Some hardware doesn't deal well with short
211 * reads (e.g. DMA must be N*maxpacket), so for now don't trim a
212 * byte off the end (to force hardware errors on overflow).
214 * RNDIS uses internal framing, and explicitly allows senders to
215 * pad to end-of-packet. That's potentially nice for speed, but
216 * means receivers can't recover lost synch on their own (because
217 * new packets don't only start after a short RX).
219 size += sizeof(struct ethhdr) + dev->net->mtu + RX_EXTRA;
220 size += dev->port_usb->header_len;
221 size += out->maxpacket - 1;
222 size -= size % out->maxpacket;
224 if (dev->port_usb->is_fixed)
225 size = max_t(size_t, size, dev->port_usb->fixed_out_len);
227 skb = alloc_skb(size + NET_IP_ALIGN, gfp_flags);
229 DBG(dev, "no rx skb\n");
233 /* Some platforms perform better when IP packets are aligned,
234 * but on at least one, checksumming fails otherwise. Note:
235 * RNDIS headers involve variable numbers of LE32 values.
237 if (likely(!dev->no_skb_reserve))
238 skb_reserve(skb, NET_IP_ALIGN);
240 req->buf = skb->data;
242 req->complete = rx_complete;
245 retval = usb_ep_queue(out, req, gfp_flags);
246 if (retval == -ENOMEM)
248 defer_kevent(dev, WORK_RX_MEMORY);
250 DBG(dev, "rx submit --> %d\n", retval);
252 dev_kfree_skb_any(skb);
253 spin_lock_irqsave(&dev->req_lock, flags);
254 list_add(&req->list, &dev->rx_reqs);
255 spin_unlock_irqrestore(&dev->req_lock, flags);
260 static void rx_complete(struct usb_ep *ep, struct usb_request *req)
262 struct sk_buff *skb = req->context, *skb2;
263 struct eth_dev *dev = ep->driver_data;
264 int status = req->status;
268 /* normal completion */
270 skb_put(skb, req->actual);
275 spin_lock_irqsave(&dev->lock, flags);
277 status = dev->unwrap(dev->port_usb,
281 dev_kfree_skb_any(skb);
284 spin_unlock_irqrestore(&dev->lock, flags);
286 skb_queue_tail(&dev->rx_frames, skb);
290 skb2 = skb_dequeue(&dev->rx_frames);
293 || ETH_HLEN > skb2->len
294 || skb2->len > GETHER_MAX_ETH_FRAME_LEN) {
295 dev->net->stats.rx_errors++;
296 dev->net->stats.rx_length_errors++;
297 DBG(dev, "rx length %d\n", skb2->len);
298 dev_kfree_skb_any(skb2);
301 skb2->protocol = eth_type_trans(skb2, dev->net);
302 dev->net->stats.rx_packets++;
303 dev->net->stats.rx_bytes += skb2->len;
305 /* no buffer copies needed, unless hardware can't
308 status = netif_rx(skb2);
310 skb2 = skb_dequeue(&dev->rx_frames);
314 /* software-driven interface shutdown */
315 case -ECONNRESET: /* unlink */
316 case -ESHUTDOWN: /* disconnect etc */
317 VDBG(dev, "rx shutdown, code %d\n", status);
320 /* for hardware automagic (such as pxa) */
321 case -ECONNABORTED: /* endpoint reset */
322 DBG(dev, "rx %s reset\n", ep->name);
323 defer_kevent(dev, WORK_RX_MEMORY);
325 dev_kfree_skb_any(skb);
330 dev->net->stats.rx_over_errors++;
334 dev->net->stats.rx_errors++;
335 DBG(dev, "rx status %d\n", status);
340 dev_kfree_skb_any(skb);
341 if (!netif_running(dev->net)) {
343 spin_lock(&dev->req_lock);
344 list_add(&req->list, &dev->rx_reqs);
345 spin_unlock(&dev->req_lock);
349 rx_submit(dev, req, GFP_ATOMIC);
352 static int prealloc(struct list_head *list, struct usb_ep *ep, unsigned n)
355 struct usb_request *req;
360 /* queue/recycle up to N requests */
362 list_for_each_entry(req, list, list) {
367 req = usb_ep_alloc_request(ep, GFP_ATOMIC);
369 return list_empty(list) ? -ENOMEM : 0;
370 list_add(&req->list, list);
377 struct list_head *next;
379 next = req->list.next;
380 list_del(&req->list);
381 usb_ep_free_request(ep, req);
386 req = container_of(next, struct usb_request, list);
391 static int alloc_requests(struct eth_dev *dev, struct gether *link, unsigned n)
395 spin_lock(&dev->req_lock);
396 status = prealloc(&dev->tx_reqs, link->in_ep, n);
399 status = prealloc(&dev->rx_reqs, link->out_ep, n);
404 DBG(dev, "can't alloc requests\n");
406 spin_unlock(&dev->req_lock);
410 static void rx_fill(struct eth_dev *dev, gfp_t gfp_flags)
412 struct usb_request *req;
415 /* fill unused rxq slots with some skb */
416 spin_lock_irqsave(&dev->req_lock, flags);
417 while (!list_empty(&dev->rx_reqs)) {
418 req = container_of(dev->rx_reqs.next,
419 struct usb_request, list);
420 list_del_init(&req->list);
421 spin_unlock_irqrestore(&dev->req_lock, flags);
423 if (rx_submit(dev, req, gfp_flags) < 0) {
424 defer_kevent(dev, WORK_RX_MEMORY);
428 spin_lock_irqsave(&dev->req_lock, flags);
430 spin_unlock_irqrestore(&dev->req_lock, flags);
433 static void eth_work(struct work_struct *work)
435 struct eth_dev *dev = container_of(work, struct eth_dev, work);
437 if (test_and_clear_bit(WORK_RX_MEMORY, &dev->todo)) {
438 if (netif_running(dev->net))
439 rx_fill(dev, GFP_KERNEL);
443 DBG(dev, "work done, flags = 0x%lx\n", dev->todo);
446 static void tx_complete(struct usb_ep *ep, struct usb_request *req)
448 struct sk_buff *skb = req->context;
449 struct eth_dev *dev = ep->driver_data;
451 switch (req->status) {
453 dev->net->stats.tx_errors++;
454 VDBG(dev, "tx err %d\n", req->status);
456 case -ECONNRESET: /* unlink */
457 case -ESHUTDOWN: /* disconnect etc */
460 dev->net->stats.tx_bytes += skb->len;
462 dev->net->stats.tx_packets++;
464 spin_lock(&dev->req_lock);
465 list_add(&req->list, &dev->tx_reqs);
466 spin_unlock(&dev->req_lock);
467 dev_kfree_skb_any(skb);
469 atomic_dec(&dev->tx_qlen);
470 if (netif_carrier_ok(dev->net))
471 netif_wake_queue(dev->net);
474 static inline int is_promisc(u16 cdc_filter)
476 return cdc_filter & USB_CDC_PACKET_TYPE_PROMISCUOUS;
479 static netdev_tx_t eth_start_xmit(struct sk_buff *skb,
480 struct net_device *net)
482 struct eth_dev *dev = netdev_priv(net);
485 struct usb_request *req = NULL;
490 spin_lock_irqsave(&dev->lock, flags);
492 in = dev->port_usb->in_ep;
493 cdc_filter = dev->port_usb->cdc_filter;
498 spin_unlock_irqrestore(&dev->lock, flags);
501 dev_kfree_skb_any(skb);
505 /* apply outgoing CDC or RNDIS filters */
506 if (skb && !is_promisc(cdc_filter)) {
507 u8 *dest = skb->data;
509 if (is_multicast_ether_addr(dest)) {
512 /* ignores USB_CDC_PACKET_TYPE_MULTICAST and host
513 * SET_ETHERNET_MULTICAST_FILTERS requests
515 if (is_broadcast_ether_addr(dest))
516 type = USB_CDC_PACKET_TYPE_BROADCAST;
518 type = USB_CDC_PACKET_TYPE_ALL_MULTICAST;
519 if (!(cdc_filter & type)) {
520 dev_kfree_skb_any(skb);
524 /* ignores USB_CDC_PACKET_TYPE_DIRECTED */
527 spin_lock_irqsave(&dev->req_lock, flags);
529 * this freelist can be empty if an interrupt triggered disconnect()
530 * and reconfigured the gadget (shutting down this queue) after the
531 * network stack decided to xmit but before we got the spinlock.
533 if (list_empty(&dev->tx_reqs)) {
534 spin_unlock_irqrestore(&dev->req_lock, flags);
535 return NETDEV_TX_BUSY;
538 req = container_of(dev->tx_reqs.next, struct usb_request, list);
539 list_del(&req->list);
541 /* temporarily stop TX queue when the freelist empties */
542 if (list_empty(&dev->tx_reqs))
543 netif_stop_queue(net);
544 spin_unlock_irqrestore(&dev->req_lock, flags);
546 /* no buffer copies needed, unless the network stack did it
547 * or the hardware can't use skb buffers.
548 * or there's not enough space for extra headers we need
553 spin_lock_irqsave(&dev->lock, flags);
555 skb = dev->wrap(dev->port_usb, skb);
556 spin_unlock_irqrestore(&dev->lock, flags);
558 /* Multi frame CDC protocols may store the frame for
559 * later which is not a dropped frame.
562 dev->port_usb->supports_multi_frame)
569 req->buf = skb->data;
571 req->complete = tx_complete;
573 /* NCM requires no zlp if transfer is dwNtbInMaxSize */
574 if (dev->port_usb->is_fixed &&
575 length == dev->port_usb->fixed_in_len &&
576 (length % in->maxpacket) == 0)
581 /* use zlp framing on tx for strict CDC-Ether conformance,
582 * though any robust network rx path ignores extra padding.
583 * and some hardware doesn't like to write zlps.
585 if (req->zero && !dev->zlp && (length % in->maxpacket) == 0)
588 req->length = length;
590 /* throttle high/super speed IRQ rate back slightly */
591 if (gadget_is_dualspeed(dev->gadget))
592 req->no_interrupt = (dev->gadget->speed == USB_SPEED_HIGH ||
593 dev->gadget->speed == USB_SPEED_SUPER)
594 ? ((atomic_read(&dev->tx_qlen) % dev->qmult) != 0)
597 retval = usb_ep_queue(in, req, GFP_ATOMIC);
600 DBG(dev, "tx queue err %d\n", retval);
603 netif_trans_update(net);
604 atomic_inc(&dev->tx_qlen);
608 dev_kfree_skb_any(skb);
610 dev->net->stats.tx_dropped++;
612 spin_lock_irqsave(&dev->req_lock, flags);
613 if (list_empty(&dev->tx_reqs))
614 netif_start_queue(net);
615 list_add(&req->list, &dev->tx_reqs);
616 spin_unlock_irqrestore(&dev->req_lock, flags);
621 /*-------------------------------------------------------------------------*/
623 static void eth_start(struct eth_dev *dev, gfp_t gfp_flags)
625 DBG(dev, "%s\n", __func__);
627 /* fill the rx queue */
628 rx_fill(dev, gfp_flags);
630 /* and open the tx floodgates */
631 atomic_set(&dev->tx_qlen, 0);
632 netif_wake_queue(dev->net);
635 static int eth_open(struct net_device *net)
637 struct eth_dev *dev = netdev_priv(net);
640 DBG(dev, "%s\n", __func__);
641 if (netif_carrier_ok(dev->net))
642 eth_start(dev, GFP_KERNEL);
644 spin_lock_irq(&dev->lock);
645 link = dev->port_usb;
646 if (link && link->open)
648 spin_unlock_irq(&dev->lock);
653 static int eth_stop(struct net_device *net)
655 struct eth_dev *dev = netdev_priv(net);
658 VDBG(dev, "%s\n", __func__);
659 netif_stop_queue(net);
661 DBG(dev, "stop stats: rx/tx %ld/%ld, errs %ld/%ld\n",
662 dev->net->stats.rx_packets, dev->net->stats.tx_packets,
663 dev->net->stats.rx_errors, dev->net->stats.tx_errors
666 /* ensure there are no more active requests */
667 spin_lock_irqsave(&dev->lock, flags);
669 struct gether *link = dev->port_usb;
670 const struct usb_endpoint_descriptor *in;
671 const struct usb_endpoint_descriptor *out;
676 /* NOTE: we have no abort-queue primitive we could use
677 * to cancel all pending I/O. Instead, we disable then
678 * reenable the endpoints ... this idiom may leave toggle
679 * wrong, but that's a self-correcting error.
681 * REVISIT: we *COULD* just let the transfers complete at
682 * their own pace; the network stack can handle old packets.
683 * For the moment we leave this here, since it works.
685 in = link->in_ep->desc;
686 out = link->out_ep->desc;
687 usb_ep_disable(link->in_ep);
688 usb_ep_disable(link->out_ep);
689 if (netif_carrier_ok(net)) {
690 DBG(dev, "host still using in/out endpoints\n");
691 link->in_ep->desc = in;
692 link->out_ep->desc = out;
693 usb_ep_enable(link->in_ep);
694 usb_ep_enable(link->out_ep);
697 spin_unlock_irqrestore(&dev->lock, flags);
702 /*-------------------------------------------------------------------------*/
704 static int get_ether_addr(const char *str, u8 *dev_addr)
709 for (i = 0; i < 6; i++) {
712 if ((*str == '.') || (*str == ':'))
714 num = hex_to_bin(*str++) << 4;
715 num |= hex_to_bin(*str++);
718 if (is_valid_ether_addr(dev_addr))
721 eth_random_addr(dev_addr);
725 static int get_ether_addr_str(u8 dev_addr[ETH_ALEN], char *str, int len)
730 snprintf(str, len, "%pM", dev_addr);
734 static const struct net_device_ops eth_netdev_ops = {
735 .ndo_open = eth_open,
736 .ndo_stop = eth_stop,
737 .ndo_start_xmit = eth_start_xmit,
738 .ndo_change_mtu = ueth_change_mtu,
739 .ndo_set_mac_address = eth_mac_addr,
740 .ndo_validate_addr = eth_validate_addr,
743 static struct device_type gadget_type = {
748 * gether_setup_name - initialize one ethernet-over-usb link
749 * @g: gadget to associated with these links
750 * @ethaddr: NULL, or a buffer in which the ethernet address of the
751 * host side of the link is recorded
752 * @netname: name for network device (for example, "usb")
755 * This sets up the single network link that may be exported by a
756 * gadget driver using this framework. The link layer addresses are
757 * set up using module parameters.
759 * Returns an eth_dev pointer on success, or an ERR_PTR on failure.
761 struct eth_dev *gether_setup_name(struct usb_gadget *g,
762 const char *dev_addr, const char *host_addr,
763 u8 ethaddr[ETH_ALEN], unsigned qmult, const char *netname)
766 struct net_device *net;
769 net = alloc_etherdev(sizeof *dev);
771 return ERR_PTR(-ENOMEM);
773 dev = netdev_priv(net);
774 spin_lock_init(&dev->lock);
775 spin_lock_init(&dev->req_lock);
776 INIT_WORK(&dev->work, eth_work);
777 INIT_LIST_HEAD(&dev->tx_reqs);
778 INIT_LIST_HEAD(&dev->rx_reqs);
780 skb_queue_head_init(&dev->rx_frames);
782 /* network device setup */
785 snprintf(net->name, sizeof(net->name), "%s%%d", netname);
787 if (get_ether_addr(dev_addr, net->dev_addr))
789 "using random %s ethernet address\n", "self");
790 if (get_ether_addr(host_addr, dev->host_mac))
792 "using random %s ethernet address\n", "host");
795 memcpy(ethaddr, dev->host_mac, ETH_ALEN);
797 net->netdev_ops = ð_netdev_ops;
799 net->ethtool_ops = &ops;
802 SET_NETDEV_DEV(net, &g->dev);
803 SET_NETDEV_DEVTYPE(net, &gadget_type);
805 status = register_netdev(net);
807 dev_dbg(&g->dev, "register_netdev failed, %d\n", status);
809 dev = ERR_PTR(status);
811 INFO(dev, "MAC %pM\n", net->dev_addr);
812 INFO(dev, "HOST MAC %pM\n", dev->host_mac);
815 * two kinds of host-initiated state changes:
816 * - iff DATA transfer is active, carrier is "on"
817 * - tx queueing enabled if open *and* carrier is "on"
819 netif_carrier_off(net);
824 EXPORT_SYMBOL_GPL(gether_setup_name);
826 struct net_device *gether_setup_name_default(const char *netname)
828 struct net_device *net;
831 net = alloc_etherdev(sizeof(*dev));
833 return ERR_PTR(-ENOMEM);
835 dev = netdev_priv(net);
836 spin_lock_init(&dev->lock);
837 spin_lock_init(&dev->req_lock);
838 INIT_WORK(&dev->work, eth_work);
839 INIT_LIST_HEAD(&dev->tx_reqs);
840 INIT_LIST_HEAD(&dev->rx_reqs);
842 skb_queue_head_init(&dev->rx_frames);
844 /* network device setup */
846 dev->qmult = QMULT_DEFAULT;
847 snprintf(net->name, sizeof(net->name), "%s%%d", netname);
849 eth_random_addr(dev->dev_mac);
850 pr_warn("using random %s ethernet address\n", "self");
851 eth_random_addr(dev->host_mac);
852 pr_warn("using random %s ethernet address\n", "host");
854 net->netdev_ops = ð_netdev_ops;
856 net->ethtool_ops = &ops;
857 SET_NETDEV_DEVTYPE(net, &gadget_type);
861 EXPORT_SYMBOL_GPL(gether_setup_name_default);
863 int gether_register_netdev(struct net_device *net)
866 struct usb_gadget *g;
870 if (!net->dev.parent)
872 dev = netdev_priv(net);
874 status = register_netdev(net);
876 dev_dbg(&g->dev, "register_netdev failed, %d\n", status);
879 INFO(dev, "HOST MAC %pM\n", dev->host_mac);
881 /* two kinds of host-initiated state changes:
882 * - iff DATA transfer is active, carrier is "on"
883 * - tx queueing enabled if open *and* carrier is "on"
885 netif_carrier_off(net);
887 sa.sa_family = net->type;
888 memcpy(sa.sa_data, dev->dev_mac, ETH_ALEN);
890 status = dev_set_mac_address(net, &sa);
893 pr_warn("cannot set self ethernet address: %d\n", status);
895 INFO(dev, "MAC %pM\n", dev->dev_mac);
899 EXPORT_SYMBOL_GPL(gether_register_netdev);
901 void gether_set_gadget(struct net_device *net, struct usb_gadget *g)
905 dev = netdev_priv(net);
907 SET_NETDEV_DEV(net, &g->dev);
909 EXPORT_SYMBOL_GPL(gether_set_gadget);
911 int gether_set_dev_addr(struct net_device *net, const char *dev_addr)
914 u8 new_addr[ETH_ALEN];
916 dev = netdev_priv(net);
917 if (get_ether_addr(dev_addr, new_addr))
919 memcpy(dev->dev_mac, new_addr, ETH_ALEN);
922 EXPORT_SYMBOL_GPL(gether_set_dev_addr);
924 int gether_get_dev_addr(struct net_device *net, char *dev_addr, int len)
928 dev = netdev_priv(net);
929 return get_ether_addr_str(dev->dev_mac, dev_addr, len);
931 EXPORT_SYMBOL_GPL(gether_get_dev_addr);
933 int gether_set_host_addr(struct net_device *net, const char *host_addr)
936 u8 new_addr[ETH_ALEN];
938 dev = netdev_priv(net);
939 if (get_ether_addr(host_addr, new_addr))
941 memcpy(dev->host_mac, new_addr, ETH_ALEN);
944 EXPORT_SYMBOL_GPL(gether_set_host_addr);
946 int gether_get_host_addr(struct net_device *net, char *host_addr, int len)
950 dev = netdev_priv(net);
951 return get_ether_addr_str(dev->host_mac, host_addr, len);
953 EXPORT_SYMBOL_GPL(gether_get_host_addr);
955 int gether_get_host_addr_cdc(struct net_device *net, char *host_addr, int len)
962 dev = netdev_priv(net);
963 snprintf(host_addr, len, "%pm", dev->host_mac);
965 return strlen(host_addr);
967 EXPORT_SYMBOL_GPL(gether_get_host_addr_cdc);
969 void gether_get_host_addr_u8(struct net_device *net, u8 host_mac[ETH_ALEN])
973 dev = netdev_priv(net);
974 memcpy(host_mac, dev->host_mac, ETH_ALEN);
976 EXPORT_SYMBOL_GPL(gether_get_host_addr_u8);
978 void gether_set_qmult(struct net_device *net, unsigned qmult)
982 dev = netdev_priv(net);
985 EXPORT_SYMBOL_GPL(gether_set_qmult);
987 unsigned gether_get_qmult(struct net_device *net)
991 dev = netdev_priv(net);
994 EXPORT_SYMBOL_GPL(gether_get_qmult);
996 int gether_get_ifname(struct net_device *net, char *name, int len)
999 strlcpy(name, netdev_name(net), len);
1001 return strlen(name);
1003 EXPORT_SYMBOL_GPL(gether_get_ifname);
1006 * gether_cleanup - remove Ethernet-over-USB device
1007 * Context: may sleep
1009 * This is called to free all resources allocated by @gether_setup().
1011 void gether_cleanup(struct eth_dev *dev)
1016 unregister_netdev(dev->net);
1017 flush_work(&dev->work);
1018 free_netdev(dev->net);
1020 EXPORT_SYMBOL_GPL(gether_cleanup);
1023 * gether_connect - notify network layer that USB link is active
1024 * @link: the USB link, set up with endpoints, descriptors matching
1025 * current device speed, and any framing wrapper(s) set up.
1026 * Context: irqs blocked
1028 * This is called to activate endpoints and let the network layer know
1029 * the connection is active ("carrier detect"). It may cause the I/O
1030 * queues to open and start letting network packets flow, but will in
1031 * any case activate the endpoints so that they respond properly to the
1034 * Verify net_device pointer returned using IS_ERR(). If it doesn't
1035 * indicate some error code (negative errno), ep->driver_data values
1036 * have been overwritten.
1038 struct net_device *gether_connect(struct gether *link)
1040 struct eth_dev *dev = link->ioport;
1044 return ERR_PTR(-EINVAL);
1046 link->in_ep->driver_data = dev;
1047 result = usb_ep_enable(link->in_ep);
1049 DBG(dev, "enable %s --> %d\n",
1050 link->in_ep->name, result);
1054 link->out_ep->driver_data = dev;
1055 result = usb_ep_enable(link->out_ep);
1057 DBG(dev, "enable %s --> %d\n",
1058 link->out_ep->name, result);
1063 result = alloc_requests(dev, link, qlen(dev->gadget,
1067 dev->zlp = link->is_zlp_ok;
1068 dev->no_skb_reserve = link->no_skb_reserve;
1069 DBG(dev, "qlen %d\n", qlen(dev->gadget, dev->qmult));
1071 dev->header_len = link->header_len;
1072 dev->unwrap = link->unwrap;
1073 dev->wrap = link->wrap;
1075 spin_lock(&dev->lock);
1076 dev->port_usb = link;
1077 if (netif_running(dev->net)) {
1084 spin_unlock(&dev->lock);
1086 netif_carrier_on(dev->net);
1087 if (netif_running(dev->net))
1088 eth_start(dev, GFP_ATOMIC);
1090 /* on error, disable any endpoints */
1092 (void) usb_ep_disable(link->out_ep);
1094 (void) usb_ep_disable(link->in_ep);
1097 /* caller is responsible for cleanup on error */
1099 return ERR_PTR(result);
1102 EXPORT_SYMBOL_GPL(gether_connect);
1105 * gether_disconnect - notify network layer that USB link is inactive
1106 * @link: the USB link, on which gether_connect() was called
1107 * Context: irqs blocked
1109 * This is called to deactivate endpoints and let the network layer know
1110 * the connection went inactive ("no carrier").
1112 * On return, the state is as if gether_connect() had never been called.
1113 * The endpoints are inactive, and accordingly without active USB I/O.
1114 * Pointers to endpoint descriptors and endpoint private data are nulled.
1116 void gether_disconnect(struct gether *link)
1118 struct eth_dev *dev = link->ioport;
1119 struct usb_request *req;
1125 DBG(dev, "%s\n", __func__);
1127 netif_stop_queue(dev->net);
1128 netif_carrier_off(dev->net);
1130 /* disable endpoints, forcing (synchronous) completion
1131 * of all pending i/o. then free the request objects
1132 * and forget about the endpoints.
1134 usb_ep_disable(link->in_ep);
1135 spin_lock(&dev->req_lock);
1136 while (!list_empty(&dev->tx_reqs)) {
1137 req = container_of(dev->tx_reqs.next,
1138 struct usb_request, list);
1139 list_del(&req->list);
1141 spin_unlock(&dev->req_lock);
1142 usb_ep_free_request(link->in_ep, req);
1143 spin_lock(&dev->req_lock);
1145 spin_unlock(&dev->req_lock);
1146 link->in_ep->desc = NULL;
1148 usb_ep_disable(link->out_ep);
1149 spin_lock(&dev->req_lock);
1150 while (!list_empty(&dev->rx_reqs)) {
1151 req = container_of(dev->rx_reqs.next,
1152 struct usb_request, list);
1153 list_del(&req->list);
1155 spin_unlock(&dev->req_lock);
1156 usb_ep_free_request(link->out_ep, req);
1157 spin_lock(&dev->req_lock);
1159 spin_unlock(&dev->req_lock);
1160 link->out_ep->desc = NULL;
1162 /* finish forgetting about this USB link episode */
1163 dev->header_len = 0;
1167 spin_lock(&dev->lock);
1168 dev->port_usb = NULL;
1169 spin_unlock(&dev->lock);
1171 EXPORT_SYMBOL_GPL(gether_disconnect);
1173 MODULE_LICENSE("GPL");
1174 MODULE_AUTHOR("David Brownell");