1 // SPDX-License-Identifier: GPL-2.0+
3 * u_ether.c -- Ethernet-over-USB link layer utilities for Gadget stack
5 * Copyright (C) 2003-2005,2008 David Brownell
6 * Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger
7 * Copyright (C) 2008 Nokia Corporation
10 /* #define VERBOSE_DEBUG */
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/gfp.h>
15 #include <linux/device.h>
16 #include <linux/ctype.h>
17 #include <linux/etherdevice.h>
18 #include <linux/ethtool.h>
19 #include <linux/if_vlan.h>
25 * This component encapsulates the Ethernet link glue needed to provide
26 * one (!) network link through the USB gadget stack, normally "usb0".
28 * The control and data models are handled by the function driver which
29 * connects to this code; such as CDC Ethernet (ECM or EEM),
30 * "CDC Subset", or RNDIS. That includes all descriptor and endpoint
33 * Link level addressing is handled by this component using module
34 * parameters; if no such parameters are provided, random link level
35 * addresses are used. Each end of the link uses one address. The
36 * host end address is exported in various ways, and is often recorded
37 * in configuration databases.
39 * The driver which assembles each configuration using such a link is
40 * responsible for ensuring that each configuration includes at most one
41 * instance of is network link. (The network layer provides ways for
42 * this single "physical" link to be used by multiple virtual links.)
45 #define UETH__VERSION "29-May-2008"
47 /* Experiments show that both Linux and Windows hosts allow up to 16k
48 * frame sizes. Set the max size to 15k+52 to prevent allocating 32k
49 * blocks and still have efficient handling. */
50 #define GETHER_MAX_ETH_FRAME_LEN 15412
53 /* lock is held while accessing port_usb
56 struct gether *port_usb;
58 struct net_device *net;
59 struct usb_gadget *gadget;
61 spinlock_t req_lock; /* guard {rx,tx}_reqs */
62 struct list_head tx_reqs, rx_reqs;
65 struct sk_buff_head rx_frames;
70 struct sk_buff *(*wrap)(struct gether *, struct sk_buff *skb);
71 int (*unwrap)(struct gether *,
73 struct sk_buff_head *list);
75 struct work_struct work;
78 #define WORK_RX_MEMORY 0
82 u8 host_mac[ETH_ALEN];
86 /*-------------------------------------------------------------------------*/
88 #define RX_EXTRA 20 /* bytes guarding against rx overflows */
90 #define DEFAULT_QLEN 2 /* double buffering by default */
92 /* for dual-speed hardware, use deeper queues at high/super speed */
93 static inline int qlen(struct usb_gadget *gadget, unsigned qmult)
95 if (gadget_is_dualspeed(gadget) && (gadget->speed == USB_SPEED_HIGH ||
96 gadget->speed == USB_SPEED_SUPER))
97 return qmult * DEFAULT_QLEN;
102 /*-------------------------------------------------------------------------*/
104 /* REVISIT there must be a better way than having two sets
113 #define xprintk(d, level, fmt, args...) \
114 printk(level "%s: " fmt , (d)->net->name , ## args)
118 #define DBG(dev, fmt, args...) \
119 xprintk(dev , KERN_DEBUG , fmt , ## args)
121 #define DBG(dev, fmt, args...) \
128 #define VDBG(dev, fmt, args...) \
132 #define ERROR(dev, fmt, args...) \
133 xprintk(dev , KERN_ERR , fmt , ## args)
134 #define INFO(dev, fmt, args...) \
135 xprintk(dev , KERN_INFO , fmt , ## args)
137 /*-------------------------------------------------------------------------*/
139 /* NETWORK DRIVER HOOKUP (to the layer above this driver) */
141 static void eth_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *p)
143 struct eth_dev *dev = netdev_priv(net);
145 strlcpy(p->driver, "g_ether", sizeof(p->driver));
146 strlcpy(p->version, UETH__VERSION, sizeof(p->version));
147 strlcpy(p->fw_version, dev->gadget->name, sizeof(p->fw_version));
148 strlcpy(p->bus_info, dev_name(&dev->gadget->dev), sizeof(p->bus_info));
151 /* REVISIT can also support:
152 * - WOL (by tracking suspends and issuing remote wakeup)
153 * - msglevel (implies updated messaging)
154 * - ... probably more ethtool ops
157 static const struct ethtool_ops ops = {
158 .get_drvinfo = eth_get_drvinfo,
159 .get_link = ethtool_op_get_link,
162 static void defer_kevent(struct eth_dev *dev, int flag)
164 if (test_and_set_bit(flag, &dev->todo))
166 if (!schedule_work(&dev->work))
167 ERROR(dev, "kevent %d may have been dropped\n", flag);
169 DBG(dev, "kevent %d scheduled\n", flag);
172 static void rx_complete(struct usb_ep *ep, struct usb_request *req);
175 rx_submit(struct eth_dev *dev, struct usb_request *req, gfp_t gfp_flags)
177 struct usb_gadget *g = dev->gadget;
179 int retval = -ENOMEM;
184 spin_lock_irqsave(&dev->lock, flags);
186 out = dev->port_usb->out_ep;
192 spin_unlock_irqrestore(&dev->lock, flags);
196 /* Padding up to RX_EXTRA handles minor disagreements with host.
197 * Normally we use the USB "terminate on short read" convention;
198 * so allow up to (N*maxpacket), since that memory is normally
199 * already allocated. Some hardware doesn't deal well with short
200 * reads (e.g. DMA must be N*maxpacket), so for now don't trim a
201 * byte off the end (to force hardware errors on overflow).
203 * RNDIS uses internal framing, and explicitly allows senders to
204 * pad to end-of-packet. That's potentially nice for speed, but
205 * means receivers can't recover lost synch on their own (because
206 * new packets don't only start after a short RX).
208 size += sizeof(struct ethhdr) + dev->net->mtu + RX_EXTRA;
209 size += dev->port_usb->header_len;
211 if (g->quirk_ep_out_aligned_size) {
212 size += out->maxpacket - 1;
213 size -= size % out->maxpacket;
216 if (dev->port_usb->is_fixed)
217 size = max_t(size_t, size, dev->port_usb->fixed_out_len);
218 spin_unlock_irqrestore(&dev->lock, flags);
220 skb = __netdev_alloc_skb(dev->net, size + NET_IP_ALIGN, gfp_flags);
222 DBG(dev, "no rx skb\n");
226 /* Some platforms perform better when IP packets are aligned,
227 * but on at least one, checksumming fails otherwise. Note:
228 * RNDIS headers involve variable numbers of LE32 values.
230 if (likely(!dev->no_skb_reserve))
231 skb_reserve(skb, NET_IP_ALIGN);
233 req->buf = skb->data;
235 req->complete = rx_complete;
238 retval = usb_ep_queue(out, req, gfp_flags);
239 if (retval == -ENOMEM)
241 defer_kevent(dev, WORK_RX_MEMORY);
243 DBG(dev, "rx submit --> %d\n", retval);
245 dev_kfree_skb_any(skb);
246 spin_lock_irqsave(&dev->req_lock, flags);
247 list_add(&req->list, &dev->rx_reqs);
248 spin_unlock_irqrestore(&dev->req_lock, flags);
253 static void rx_complete(struct usb_ep *ep, struct usb_request *req)
255 struct sk_buff *skb = req->context, *skb2;
256 struct eth_dev *dev = ep->driver_data;
257 int status = req->status;
261 /* normal completion */
263 skb_put(skb, req->actual);
268 spin_lock_irqsave(&dev->lock, flags);
270 status = dev->unwrap(dev->port_usb,
274 dev_kfree_skb_any(skb);
277 spin_unlock_irqrestore(&dev->lock, flags);
279 skb_queue_tail(&dev->rx_frames, skb);
283 skb2 = skb_dequeue(&dev->rx_frames);
286 || ETH_HLEN > skb2->len
287 || skb2->len > GETHER_MAX_ETH_FRAME_LEN) {
288 dev->net->stats.rx_errors++;
289 dev->net->stats.rx_length_errors++;
290 DBG(dev, "rx length %d\n", skb2->len);
291 dev_kfree_skb_any(skb2);
294 skb2->protocol = eth_type_trans(skb2, dev->net);
295 dev->net->stats.rx_packets++;
296 dev->net->stats.rx_bytes += skb2->len;
298 /* no buffer copies needed, unless hardware can't
301 status = netif_rx(skb2);
303 skb2 = skb_dequeue(&dev->rx_frames);
307 /* software-driven interface shutdown */
308 case -ECONNRESET: /* unlink */
309 case -ESHUTDOWN: /* disconnect etc */
310 VDBG(dev, "rx shutdown, code %d\n", status);
313 /* for hardware automagic (such as pxa) */
314 case -ECONNABORTED: /* endpoint reset */
315 DBG(dev, "rx %s reset\n", ep->name);
316 defer_kevent(dev, WORK_RX_MEMORY);
318 dev_kfree_skb_any(skb);
323 dev->net->stats.rx_over_errors++;
327 dev->net->stats.rx_errors++;
328 DBG(dev, "rx status %d\n", status);
333 dev_kfree_skb_any(skb);
334 if (!netif_running(dev->net)) {
336 spin_lock(&dev->req_lock);
337 list_add(&req->list, &dev->rx_reqs);
338 spin_unlock(&dev->req_lock);
342 rx_submit(dev, req, GFP_ATOMIC);
345 static int prealloc(struct list_head *list, struct usb_ep *ep, unsigned n)
348 struct usb_request *req;
353 /* queue/recycle up to N requests */
355 list_for_each_entry(req, list, list) {
360 req = usb_ep_alloc_request(ep, GFP_ATOMIC);
362 return list_empty(list) ? -ENOMEM : 0;
363 list_add(&req->list, list);
370 struct list_head *next;
372 next = req->list.next;
373 list_del(&req->list);
374 usb_ep_free_request(ep, req);
379 req = container_of(next, struct usb_request, list);
384 static int alloc_requests(struct eth_dev *dev, struct gether *link, unsigned n)
388 spin_lock(&dev->req_lock);
389 status = prealloc(&dev->tx_reqs, link->in_ep, n);
392 status = prealloc(&dev->rx_reqs, link->out_ep, n);
397 DBG(dev, "can't alloc requests\n");
399 spin_unlock(&dev->req_lock);
403 static void rx_fill(struct eth_dev *dev, gfp_t gfp_flags)
405 struct usb_request *req;
408 /* fill unused rxq slots with some skb */
409 spin_lock_irqsave(&dev->req_lock, flags);
410 while (!list_empty(&dev->rx_reqs)) {
411 req = list_first_entry(&dev->rx_reqs, struct usb_request, list);
412 list_del_init(&req->list);
413 spin_unlock_irqrestore(&dev->req_lock, flags);
415 if (rx_submit(dev, req, gfp_flags) < 0) {
416 defer_kevent(dev, WORK_RX_MEMORY);
420 spin_lock_irqsave(&dev->req_lock, flags);
422 spin_unlock_irqrestore(&dev->req_lock, flags);
425 static void eth_work(struct work_struct *work)
427 struct eth_dev *dev = container_of(work, struct eth_dev, work);
429 if (test_and_clear_bit(WORK_RX_MEMORY, &dev->todo)) {
430 if (netif_running(dev->net))
431 rx_fill(dev, GFP_KERNEL);
435 DBG(dev, "work done, flags = 0x%lx\n", dev->todo);
438 static void tx_complete(struct usb_ep *ep, struct usb_request *req)
440 struct sk_buff *skb = req->context;
441 struct eth_dev *dev = ep->driver_data;
443 switch (req->status) {
445 dev->net->stats.tx_errors++;
446 VDBG(dev, "tx err %d\n", req->status);
448 case -ECONNRESET: /* unlink */
449 case -ESHUTDOWN: /* disconnect etc */
450 dev_kfree_skb_any(skb);
453 dev->net->stats.tx_bytes += skb->len;
454 dev_consume_skb_any(skb);
456 dev->net->stats.tx_packets++;
458 spin_lock(&dev->req_lock);
459 list_add(&req->list, &dev->tx_reqs);
460 spin_unlock(&dev->req_lock);
462 atomic_dec(&dev->tx_qlen);
463 if (netif_carrier_ok(dev->net))
464 netif_wake_queue(dev->net);
467 static inline int is_promisc(u16 cdc_filter)
469 return cdc_filter & USB_CDC_PACKET_TYPE_PROMISCUOUS;
472 static netdev_tx_t eth_start_xmit(struct sk_buff *skb,
473 struct net_device *net)
475 struct eth_dev *dev = netdev_priv(net);
478 struct usb_request *req = NULL;
483 spin_lock_irqsave(&dev->lock, flags);
485 in = dev->port_usb->in_ep;
486 cdc_filter = dev->port_usb->cdc_filter;
491 spin_unlock_irqrestore(&dev->lock, flags);
494 dev_kfree_skb_any(skb);
498 /* apply outgoing CDC or RNDIS filters */
499 if (skb && !is_promisc(cdc_filter)) {
500 u8 *dest = skb->data;
502 if (is_multicast_ether_addr(dest)) {
505 /* ignores USB_CDC_PACKET_TYPE_MULTICAST and host
506 * SET_ETHERNET_MULTICAST_FILTERS requests
508 if (is_broadcast_ether_addr(dest))
509 type = USB_CDC_PACKET_TYPE_BROADCAST;
511 type = USB_CDC_PACKET_TYPE_ALL_MULTICAST;
512 if (!(cdc_filter & type)) {
513 dev_kfree_skb_any(skb);
517 /* ignores USB_CDC_PACKET_TYPE_DIRECTED */
520 spin_lock_irqsave(&dev->req_lock, flags);
522 * this freelist can be empty if an interrupt triggered disconnect()
523 * and reconfigured the gadget (shutting down this queue) after the
524 * network stack decided to xmit but before we got the spinlock.
526 if (list_empty(&dev->tx_reqs)) {
527 spin_unlock_irqrestore(&dev->req_lock, flags);
528 return NETDEV_TX_BUSY;
531 req = list_first_entry(&dev->tx_reqs, struct usb_request, list);
532 list_del(&req->list);
534 /* temporarily stop TX queue when the freelist empties */
535 if (list_empty(&dev->tx_reqs))
536 netif_stop_queue(net);
537 spin_unlock_irqrestore(&dev->req_lock, flags);
539 /* no buffer copies needed, unless the network stack did it
540 * or the hardware can't use skb buffers.
541 * or there's not enough space for extra headers we need
546 spin_lock_irqsave(&dev->lock, flags);
548 skb = dev->wrap(dev->port_usb, skb);
549 spin_unlock_irqrestore(&dev->lock, flags);
551 /* Multi frame CDC protocols may store the frame for
552 * later which is not a dropped frame.
555 dev->port_usb->supports_multi_frame)
562 req->buf = skb->data;
564 req->complete = tx_complete;
566 /* NCM requires no zlp if transfer is dwNtbInMaxSize */
568 dev->port_usb->is_fixed &&
569 length == dev->port_usb->fixed_in_len &&
570 (length % in->maxpacket) == 0)
575 /* use zlp framing on tx for strict CDC-Ether conformance,
576 * though any robust network rx path ignores extra padding.
577 * and some hardware doesn't like to write zlps.
579 if (req->zero && !dev->zlp && (length % in->maxpacket) == 0)
582 req->length = length;
584 retval = usb_ep_queue(in, req, GFP_ATOMIC);
587 DBG(dev, "tx queue err %d\n", retval);
590 netif_trans_update(net);
591 atomic_inc(&dev->tx_qlen);
595 dev_kfree_skb_any(skb);
597 dev->net->stats.tx_dropped++;
599 spin_lock_irqsave(&dev->req_lock, flags);
600 if (list_empty(&dev->tx_reqs))
601 netif_start_queue(net);
602 list_add(&req->list, &dev->tx_reqs);
603 spin_unlock_irqrestore(&dev->req_lock, flags);
608 /*-------------------------------------------------------------------------*/
610 static void eth_start(struct eth_dev *dev, gfp_t gfp_flags)
612 DBG(dev, "%s\n", __func__);
614 /* fill the rx queue */
615 rx_fill(dev, gfp_flags);
617 /* and open the tx floodgates */
618 atomic_set(&dev->tx_qlen, 0);
619 netif_wake_queue(dev->net);
622 static int eth_open(struct net_device *net)
624 struct eth_dev *dev = netdev_priv(net);
627 DBG(dev, "%s\n", __func__);
628 if (netif_carrier_ok(dev->net))
629 eth_start(dev, GFP_KERNEL);
631 spin_lock_irq(&dev->lock);
632 link = dev->port_usb;
633 if (link && link->open)
635 spin_unlock_irq(&dev->lock);
640 static int eth_stop(struct net_device *net)
642 struct eth_dev *dev = netdev_priv(net);
645 VDBG(dev, "%s\n", __func__);
646 netif_stop_queue(net);
648 DBG(dev, "stop stats: rx/tx %ld/%ld, errs %ld/%ld\n",
649 dev->net->stats.rx_packets, dev->net->stats.tx_packets,
650 dev->net->stats.rx_errors, dev->net->stats.tx_errors
653 /* ensure there are no more active requests */
654 spin_lock_irqsave(&dev->lock, flags);
656 struct gether *link = dev->port_usb;
657 const struct usb_endpoint_descriptor *in;
658 const struct usb_endpoint_descriptor *out;
663 /* NOTE: we have no abort-queue primitive we could use
664 * to cancel all pending I/O. Instead, we disable then
665 * reenable the endpoints ... this idiom may leave toggle
666 * wrong, but that's a self-correcting error.
668 * REVISIT: we *COULD* just let the transfers complete at
669 * their own pace; the network stack can handle old packets.
670 * For the moment we leave this here, since it works.
672 in = link->in_ep->desc;
673 out = link->out_ep->desc;
674 usb_ep_disable(link->in_ep);
675 usb_ep_disable(link->out_ep);
676 if (netif_carrier_ok(net)) {
677 DBG(dev, "host still using in/out endpoints\n");
678 link->in_ep->desc = in;
679 link->out_ep->desc = out;
680 usb_ep_enable(link->in_ep);
681 usb_ep_enable(link->out_ep);
684 spin_unlock_irqrestore(&dev->lock, flags);
689 /*-------------------------------------------------------------------------*/
691 static int get_ether_addr(const char *str, u8 *dev_addr)
696 for (i = 0; i < 6; i++) {
699 if ((*str == '.') || (*str == ':'))
701 num = hex_to_bin(*str++) << 4;
702 num |= hex_to_bin(*str++);
705 if (is_valid_ether_addr(dev_addr))
708 eth_random_addr(dev_addr);
712 static int get_ether_addr_str(u8 dev_addr[ETH_ALEN], char *str, int len)
717 snprintf(str, len, "%pM", dev_addr);
721 static const struct net_device_ops eth_netdev_ops = {
722 .ndo_open = eth_open,
723 .ndo_stop = eth_stop,
724 .ndo_start_xmit = eth_start_xmit,
725 .ndo_set_mac_address = eth_mac_addr,
726 .ndo_validate_addr = eth_validate_addr,
729 static struct device_type gadget_type = {
734 * gether_setup_name - initialize one ethernet-over-usb link
735 * @g: gadget to associated with these links
736 * @ethaddr: NULL, or a buffer in which the ethernet address of the
737 * host side of the link is recorded
738 * @netname: name for network device (for example, "usb")
741 * This sets up the single network link that may be exported by a
742 * gadget driver using this framework. The link layer addresses are
743 * set up using module parameters.
745 * Returns an eth_dev pointer on success, or an ERR_PTR on failure.
747 struct eth_dev *gether_setup_name(struct usb_gadget *g,
748 const char *dev_addr, const char *host_addr,
749 u8 ethaddr[ETH_ALEN], unsigned qmult, const char *netname)
752 struct net_device *net;
755 net = alloc_etherdev(sizeof *dev);
757 return ERR_PTR(-ENOMEM);
759 dev = netdev_priv(net);
760 spin_lock_init(&dev->lock);
761 spin_lock_init(&dev->req_lock);
762 INIT_WORK(&dev->work, eth_work);
763 INIT_LIST_HEAD(&dev->tx_reqs);
764 INIT_LIST_HEAD(&dev->rx_reqs);
766 skb_queue_head_init(&dev->rx_frames);
768 /* network device setup */
771 snprintf(net->name, sizeof(net->name), "%s%%d", netname);
773 if (get_ether_addr(dev_addr, net->dev_addr))
775 "using random %s ethernet address\n", "self");
776 if (get_ether_addr(host_addr, dev->host_mac))
778 "using random %s ethernet address\n", "host");
781 memcpy(ethaddr, dev->host_mac, ETH_ALEN);
783 net->netdev_ops = ð_netdev_ops;
785 net->ethtool_ops = &ops;
787 /* MTU range: 14 - 15412 */
788 net->min_mtu = ETH_HLEN;
789 net->max_mtu = GETHER_MAX_ETH_FRAME_LEN;
792 SET_NETDEV_DEV(net, &g->dev);
793 SET_NETDEV_DEVTYPE(net, &gadget_type);
795 status = register_netdev(net);
797 dev_dbg(&g->dev, "register_netdev failed, %d\n", status);
799 dev = ERR_PTR(status);
801 INFO(dev, "MAC %pM\n", net->dev_addr);
802 INFO(dev, "HOST MAC %pM\n", dev->host_mac);
805 * two kinds of host-initiated state changes:
806 * - iff DATA transfer is active, carrier is "on"
807 * - tx queueing enabled if open *and* carrier is "on"
809 netif_carrier_off(net);
814 EXPORT_SYMBOL_GPL(gether_setup_name);
816 struct net_device *gether_setup_name_default(const char *netname)
818 struct net_device *net;
821 net = alloc_etherdev(sizeof(*dev));
823 return ERR_PTR(-ENOMEM);
825 dev = netdev_priv(net);
826 spin_lock_init(&dev->lock);
827 spin_lock_init(&dev->req_lock);
828 INIT_WORK(&dev->work, eth_work);
829 INIT_LIST_HEAD(&dev->tx_reqs);
830 INIT_LIST_HEAD(&dev->rx_reqs);
832 skb_queue_head_init(&dev->rx_frames);
834 /* network device setup */
836 dev->qmult = QMULT_DEFAULT;
837 snprintf(net->name, sizeof(net->name), "%s%%d", netname);
839 eth_random_addr(dev->dev_mac);
840 pr_warn("using random %s ethernet address\n", "self");
841 eth_random_addr(dev->host_mac);
842 pr_warn("using random %s ethernet address\n", "host");
844 net->netdev_ops = ð_netdev_ops;
846 net->ethtool_ops = &ops;
847 SET_NETDEV_DEVTYPE(net, &gadget_type);
849 /* MTU range: 14 - 15412 */
850 net->min_mtu = ETH_HLEN;
851 net->max_mtu = GETHER_MAX_ETH_FRAME_LEN;
855 EXPORT_SYMBOL_GPL(gether_setup_name_default);
857 int gether_register_netdev(struct net_device *net)
860 struct usb_gadget *g;
864 if (!net->dev.parent)
866 dev = netdev_priv(net);
868 status = register_netdev(net);
870 dev_dbg(&g->dev, "register_netdev failed, %d\n", status);
873 INFO(dev, "HOST MAC %pM\n", dev->host_mac);
875 /* two kinds of host-initiated state changes:
876 * - iff DATA transfer is active, carrier is "on"
877 * - tx queueing enabled if open *and* carrier is "on"
879 netif_carrier_off(net);
881 sa.sa_family = net->type;
882 memcpy(sa.sa_data, dev->dev_mac, ETH_ALEN);
884 status = dev_set_mac_address(net, &sa, NULL);
887 pr_warn("cannot set self ethernet address: %d\n", status);
889 INFO(dev, "MAC %pM\n", dev->dev_mac);
893 EXPORT_SYMBOL_GPL(gether_register_netdev);
895 void gether_set_gadget(struct net_device *net, struct usb_gadget *g)
899 dev = netdev_priv(net);
901 SET_NETDEV_DEV(net, &g->dev);
903 EXPORT_SYMBOL_GPL(gether_set_gadget);
905 int gether_set_dev_addr(struct net_device *net, const char *dev_addr)
908 u8 new_addr[ETH_ALEN];
910 dev = netdev_priv(net);
911 if (get_ether_addr(dev_addr, new_addr))
913 memcpy(dev->dev_mac, new_addr, ETH_ALEN);
916 EXPORT_SYMBOL_GPL(gether_set_dev_addr);
918 int gether_get_dev_addr(struct net_device *net, char *dev_addr, int len)
923 dev = netdev_priv(net);
924 ret = get_ether_addr_str(dev->dev_mac, dev_addr, len);
926 dev_addr[ret++] = '\n';
927 dev_addr[ret] = '\0';
932 EXPORT_SYMBOL_GPL(gether_get_dev_addr);
934 int gether_set_host_addr(struct net_device *net, const char *host_addr)
937 u8 new_addr[ETH_ALEN];
939 dev = netdev_priv(net);
940 if (get_ether_addr(host_addr, new_addr))
942 memcpy(dev->host_mac, new_addr, ETH_ALEN);
945 EXPORT_SYMBOL_GPL(gether_set_host_addr);
947 int gether_get_host_addr(struct net_device *net, char *host_addr, int len)
952 dev = netdev_priv(net);
953 ret = get_ether_addr_str(dev->host_mac, host_addr, len);
955 host_addr[ret++] = '\n';
956 host_addr[ret] = '\0';
961 EXPORT_SYMBOL_GPL(gether_get_host_addr);
963 int gether_get_host_addr_cdc(struct net_device *net, char *host_addr, int len)
970 dev = netdev_priv(net);
971 snprintf(host_addr, len, "%pm", dev->host_mac);
973 return strlen(host_addr);
975 EXPORT_SYMBOL_GPL(gether_get_host_addr_cdc);
977 void gether_get_host_addr_u8(struct net_device *net, u8 host_mac[ETH_ALEN])
981 dev = netdev_priv(net);
982 memcpy(host_mac, dev->host_mac, ETH_ALEN);
984 EXPORT_SYMBOL_GPL(gether_get_host_addr_u8);
986 void gether_set_qmult(struct net_device *net, unsigned qmult)
990 dev = netdev_priv(net);
993 EXPORT_SYMBOL_GPL(gether_set_qmult);
995 unsigned gether_get_qmult(struct net_device *net)
999 dev = netdev_priv(net);
1002 EXPORT_SYMBOL_GPL(gether_get_qmult);
1004 int gether_get_ifname(struct net_device *net, char *name, int len)
1009 ret = scnprintf(name, len, "%s\n", netdev_name(net));
1013 EXPORT_SYMBOL_GPL(gether_get_ifname);
1016 * gether_cleanup - remove Ethernet-over-USB device
1017 * Context: may sleep
1019 * This is called to free all resources allocated by @gether_setup().
1021 void gether_cleanup(struct eth_dev *dev)
1026 unregister_netdev(dev->net);
1027 flush_work(&dev->work);
1028 free_netdev(dev->net);
1030 EXPORT_SYMBOL_GPL(gether_cleanup);
1033 * gether_connect - notify network layer that USB link is active
1034 * @link: the USB link, set up with endpoints, descriptors matching
1035 * current device speed, and any framing wrapper(s) set up.
1036 * Context: irqs blocked
1038 * This is called to activate endpoints and let the network layer know
1039 * the connection is active ("carrier detect"). It may cause the I/O
1040 * queues to open and start letting network packets flow, but will in
1041 * any case activate the endpoints so that they respond properly to the
1044 * Verify net_device pointer returned using IS_ERR(). If it doesn't
1045 * indicate some error code (negative errno), ep->driver_data values
1046 * have been overwritten.
1048 struct net_device *gether_connect(struct gether *link)
1050 struct eth_dev *dev = link->ioport;
1054 return ERR_PTR(-EINVAL);
1056 link->in_ep->driver_data = dev;
1057 result = usb_ep_enable(link->in_ep);
1059 DBG(dev, "enable %s --> %d\n",
1060 link->in_ep->name, result);
1064 link->out_ep->driver_data = dev;
1065 result = usb_ep_enable(link->out_ep);
1067 DBG(dev, "enable %s --> %d\n",
1068 link->out_ep->name, result);
1073 result = alloc_requests(dev, link, qlen(dev->gadget,
1077 dev->zlp = link->is_zlp_ok;
1078 dev->no_skb_reserve = gadget_avoids_skb_reserve(dev->gadget);
1079 DBG(dev, "qlen %d\n", qlen(dev->gadget, dev->qmult));
1081 dev->header_len = link->header_len;
1082 dev->unwrap = link->unwrap;
1083 dev->wrap = link->wrap;
1085 spin_lock(&dev->lock);
1086 dev->port_usb = link;
1087 if (netif_running(dev->net)) {
1094 spin_unlock(&dev->lock);
1096 netif_carrier_on(dev->net);
1097 if (netif_running(dev->net))
1098 eth_start(dev, GFP_ATOMIC);
1100 /* on error, disable any endpoints */
1102 (void) usb_ep_disable(link->out_ep);
1104 (void) usb_ep_disable(link->in_ep);
1107 /* caller is responsible for cleanup on error */
1109 return ERR_PTR(result);
1112 EXPORT_SYMBOL_GPL(gether_connect);
1115 * gether_disconnect - notify network layer that USB link is inactive
1116 * @link: the USB link, on which gether_connect() was called
1117 * Context: irqs blocked
1119 * This is called to deactivate endpoints and let the network layer know
1120 * the connection went inactive ("no carrier").
1122 * On return, the state is as if gether_connect() had never been called.
1123 * The endpoints are inactive, and accordingly without active USB I/O.
1124 * Pointers to endpoint descriptors and endpoint private data are nulled.
1126 void gether_disconnect(struct gether *link)
1128 struct eth_dev *dev = link->ioport;
1129 struct usb_request *req;
1135 DBG(dev, "%s\n", __func__);
1137 netif_stop_queue(dev->net);
1138 netif_carrier_off(dev->net);
1140 /* disable endpoints, forcing (synchronous) completion
1141 * of all pending i/o. then free the request objects
1142 * and forget about the endpoints.
1144 usb_ep_disable(link->in_ep);
1145 spin_lock(&dev->req_lock);
1146 while (!list_empty(&dev->tx_reqs)) {
1147 req = list_first_entry(&dev->tx_reqs, struct usb_request, list);
1148 list_del(&req->list);
1150 spin_unlock(&dev->req_lock);
1151 usb_ep_free_request(link->in_ep, req);
1152 spin_lock(&dev->req_lock);
1154 spin_unlock(&dev->req_lock);
1155 link->in_ep->desc = NULL;
1157 usb_ep_disable(link->out_ep);
1158 spin_lock(&dev->req_lock);
1159 while (!list_empty(&dev->rx_reqs)) {
1160 req = list_first_entry(&dev->rx_reqs, struct usb_request, list);
1161 list_del(&req->list);
1163 spin_unlock(&dev->req_lock);
1164 usb_ep_free_request(link->out_ep, req);
1165 spin_lock(&dev->req_lock);
1167 spin_unlock(&dev->req_lock);
1168 link->out_ep->desc = NULL;
1170 /* finish forgetting about this USB link episode */
1171 dev->header_len = 0;
1175 spin_lock(&dev->lock);
1176 dev->port_usb = NULL;
1177 spin_unlock(&dev->lock);
1179 EXPORT_SYMBOL_GPL(gether_disconnect);
1181 MODULE_LICENSE("GPL");
1182 MODULE_AUTHOR("David Brownell");