Release 4.17 drivers/usb/gadget/function/u_ether.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * u_ether.c -- Ethernet-over-USB link layer utilities for Gadget stack
 *
 * Copyright (C) 2003-2005,2008 David Brownell
 * Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger
 * Copyright (C) 2008 Nokia Corporation
 */

/* #define VERBOSE_DEBUG */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/gfp.h>
#include <linux/device.h>
#include <linux/ctype.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/if_vlan.h>

#include "u_ether.h"


/*
 * This component encapsulates the Ethernet link glue needed to provide
 * one (!) network link through the USB gadget stack, normally "usb0".
 *
 * The control and data models are handled by the function driver which
 * connects to this code; such as CDC Ethernet (ECM or EEM),
 * "CDC Subset", or RNDIS.  That includes all descriptor and endpoint
 * management.
 *
 * Link level addressing is handled by this component using module
 * parameters; if no such parameters are provided, random link level
 * addresses are used.  Each end of the link uses one address.  The
 * host end address is exported in various ways, and is often recorded
 * in configuration databases.
 *
 * The driver which assembles each configuration using such a link is
 * responsible for ensuring that each configuration includes at most one
 * instance of is network link.  (The network layer provides ways for
 * this single "physical" link to be used by multiple virtual links.)
 */


#define UETH__VERSION	"29-May-2008"

/* Experiments show that both Linux and Windows hosts allow up to 16k
 * frame sizes. Set the max size to 15k+52 to prevent allocating 32k
 * blocks and still have efficient handling. */

#define GETHER_MAX_ETH_FRAME_LEN 15412


struct eth_dev {
	/* lock is held while accessing port_usb
         */
	
spinlock_t		lock;
	
struct gether		*port_usb;

	
struct net_device	*net;
	
struct usb_gadget	*gadget;

	
spinlock_t		req_lock;	/* guard {rx,tx}_reqs */
	

struct list_head	tx_reqs, rx_reqs;
	
atomic_t		tx_qlen;

	
struct sk_buff_head	rx_frames;

	
unsigned		qmult;

	
unsigned		header_len;
	
struct sk_buff		*(*wrap)(struct gether *, struct sk_buff *skb);
	
int			(*unwrap)(struct gether *,
						struct sk_buff *skb,
						struct sk_buff_head *list);

	
struct work_struct	work;

	
unsigned long		todo;

#define	WORK_RX_MEMORY		0

	
bool			zlp;
	
bool			no_skb_reserve;
	
u8			host_mac[ETH_ALEN];
	
u8			dev_mac[ETH_ALEN];
};

/*-------------------------------------------------------------------------*/


#define RX_EXTRA	20	
/* bytes guarding against rx overflows */


#define DEFAULT_QLEN	2	
/* double buffering by default */

/* for dual-speed hardware, use deeper queues at high/super speed */


static inline int qlen(struct usb_gadget *gadget, unsigned qmult)
{
	if (gadget_is_dualspeed(gadget) && (gadget->speed == USB_SPEED_HIGH ||
					    gadget->speed == USB_SPEED_SUPER))
		return qmult * DEFAULT_QLEN;
	else
		return DEFAULT_QLEN;
}

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/*-------------------------------------------------------------------------*/

/* REVISIT there must be a better way than having two sets
 * of debug calls ...
 */

#undef DBG
#undef VDBG
#undef ERROR
#undef INFO


#define xprintk(d, level, fmt, args...) \
	printk(level "%s: " fmt , (d)->net->name , ## args)

#ifdef DEBUG
#undef DEBUG

#define DBG(dev, fmt, args...) \
	xprintk(dev , KERN_DEBUG , fmt , ## args)
#else

#define DBG(dev, fmt, args...) \
	do { } while (0)
#endif /* DEBUG */

#ifdef VERBOSE_DEBUG

#define VDBG	DBG
#else

#define VDBG(dev, fmt, args...) \
	do { } while (0)
#endif /* DEBUG */


#define ERROR(dev, fmt, args...) \
	xprintk(dev , KERN_ERR , fmt , ## args)

#define INFO(dev, fmt, args...) \
	xprintk(dev , KERN_INFO , fmt , ## args)

/*-------------------------------------------------------------------------*/

/* NETWORK DRIVER HOOKUP (to the layer above this driver) */



static void eth_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *p)
{
	struct eth_dev *dev = netdev_priv(net);

	strlcpy(p->driver, "g_ether", sizeof(p->driver));
	strlcpy(p->version, UETH__VERSION, sizeof(p->version));
	strlcpy(p->fw_version, dev->gadget->name, sizeof(p->fw_version));
	strlcpy(p->bus_info, dev_name(&dev->gadget->dev), sizeof(p->bus_info));
}

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/* REVISIT can also support:
 *   - WOL (by tracking suspends and issuing remote wakeup)
 *   - msglevel (implies updated messaging)
 *   - ... probably more ethtool ops
 */


static const struct ethtool_ops ops = {
	.get_drvinfo = eth_get_drvinfo,
	.get_link = ethtool_op_get_link,
};



static void defer_kevent(struct eth_dev *dev, int flag)
{
	if (test_and_set_bit(flag, &dev->todo))
		return;
	if (!schedule_work(&dev->work))
		ERROR(dev, "kevent %d may have been dropped\n", flag);
	else
		DBG(dev, "kevent %d scheduled\n", flag);
}

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static void rx_complete(struct usb_ep *ep, struct usb_request *req);


static int

rx_submit(struct eth_dev *dev, struct usb_request *req, gfp_t gfp_flags)
{
	struct usb_gadget *g = dev->gadget;
	struct sk_buff	*skb;
	int		retval = -ENOMEM;
	size_t		size = 0;
	struct usb_ep	*out;
	unsigned long	flags;

	spin_lock_irqsave(&dev->lock, flags);
	if (dev->port_usb)
		out = dev->port_usb->out_ep;
	else
		out = NULL;
	spin_unlock_irqrestore(&dev->lock, flags);

	if (!out)
		return -ENOTCONN;


	/* Padding up to RX_EXTRA handles minor disagreements with host.
         * Normally we use the USB "terminate on short read" convention;
         * so allow up to (N*maxpacket), since that memory is normally
         * already allocated.  Some hardware doesn't deal well with short
         * reads (e.g. DMA must be N*maxpacket), so for now don't trim a
         * byte off the end (to force hardware errors on overflow).
         *
         * RNDIS uses internal framing, and explicitly allows senders to
         * pad to end-of-packet.  That's potentially nice for speed, but
         * means receivers can't recover lost synch on their own (because
         * new packets don't only start after a short RX).
         */
	size += sizeof(struct ethhdr) + dev->net->mtu + RX_EXTRA;
	size += dev->port_usb->header_len;

	if (g->quirk_ep_out_aligned_size) {
		size += out->maxpacket - 1;
		size -= size % out->maxpacket;
	}

	if (dev->port_usb->is_fixed)
		size = max_t(size_t, size, dev->port_usb->fixed_out_len);

	skb = __netdev_alloc_skb(dev->net, size + NET_IP_ALIGN, gfp_flags);
	if (skb == NULL) {
		DBG(dev, "no rx skb\n");
		goto enomem;
	}

	/* Some platforms perform better when IP packets are aligned,
         * but on at least one, checksumming fails otherwise.  Note:
         * RNDIS headers involve variable numbers of LE32 values.
         */
	if (likely(!dev->no_skb_reserve))
		skb_reserve(skb, NET_IP_ALIGN);

	req->buf = skb->data;
	req->length = size;
	req->complete = rx_complete;
	req->context = skb;

	retval = usb_ep_queue(out, req, gfp_flags);
	if (retval == -ENOMEM)
enomem:
		defer_kevent(dev, WORK_RX_MEMORY);
	if (retval) {
		DBG(dev, "rx submit --> %d\n", retval);
		if (skb)
			dev_kfree_skb_any(skb);
		spin_lock_irqsave(&dev->req_lock, flags);
		list_add(&req->list, &dev->rx_reqs);
		spin_unlock_irqrestore(&dev->req_lock, flags);
	}
	return retval;
}

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14.29%
Yoshihiro Shimoda
10
2.97%
1
14.29%
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5
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1
14.29%
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337
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static void rx_complete(struct usb_ep *ep, struct usb_request *req)
{
	struct sk_buff	*skb = req->context, *skb2;
	struct eth_dev	*dev = ep->driver_data;
	int		status = req->status;

	switch (status) {

	/* normal completion */
	case 0:
		skb_put(skb, req->actual);

		if (dev->unwrap) {
			unsigned long	flags;

			spin_lock_irqsave(&dev->lock, flags);
			if (dev->port_usb) {
				status = dev->unwrap(dev->port_usb,
							skb,
							&dev->rx_frames);
			} else {
				dev_kfree_skb_any(skb);
				status = -ENOTCONN;
			}
			spin_unlock_irqrestore(&dev->lock, flags);
		} else {
			skb_queue_tail(&dev->rx_frames, skb);
		}
		skb = NULL;

		skb2 = skb_dequeue(&dev->rx_frames);
		while (skb2) {
			if (status < 0
					|| ETH_HLEN > skb2->len
					|| skb2->len > GETHER_MAX_ETH_FRAME_LEN) {
				dev->net->stats.rx_errors++;
				dev->net->stats.rx_length_errors++;
				DBG(dev, "rx length %d\n", skb2->len);
				dev_kfree_skb_any(skb2);
				goto next_frame;
			}
			skb2->protocol = eth_type_trans(skb2, dev->net);
			dev->net->stats.rx_packets++;
			dev->net->stats.rx_bytes += skb2->len;

			/* no buffer copies needed, unless hardware can't
                         * use skb buffers.
                         */
			status = netif_rx(skb2);
next_frame:
			skb2 = skb_dequeue(&dev->rx_frames);
		}
		break;

	/* software-driven interface shutdown */
	case -ECONNRESET:		/* unlink */
	case -ESHUTDOWN:		/* disconnect etc */
		VDBG(dev, "rx shutdown, code %d\n", status);
		goto quiesce;

	/* for hardware automagic (such as pxa) */
	case -ECONNABORTED:		/* endpoint reset */
		DBG(dev, "rx %s reset\n", ep->name);
		defer_kevent(dev, WORK_RX_MEMORY);
quiesce:
		dev_kfree_skb_any(skb);
		goto clean;

	/* data overrun */
	case -EOVERFLOW:
		dev->net->stats.rx_over_errors++;
		/* FALLTHROUGH */

	default:
		dev->net->stats.rx_errors++;
		DBG(dev, "rx status %d\n", status);
		break;
	}

	if (skb)
		dev_kfree_skb_any(skb);
	if (!netif_running(dev->net)) {
clean:
		spin_lock(&dev->req_lock);
		list_add(&req->list, &dev->rx_reqs);
		spin_unlock(&dev->req_lock);
		req = NULL;
	}
	if (req)
		rx_submit(dev, req, GFP_ATOMIC);
}

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static int prealloc(struct list_head *list, struct usb_ep *ep, unsigned n)
{
	unsigned		i;
	struct usb_request	*req;

	if (!n)
		return -ENOMEM;

	/* queue/recycle up to N requests */
	i = n;
	list_for_each_entry(req, list, list) {
		if (i-- == 0)
			goto extra;
	}
	while (i--) {
		req = usb_ep_alloc_request(ep, GFP_ATOMIC);
		if (!req)
			return list_empty(list) ? -ENOMEM : 0;
		list_add(&req->list, list);
	}
	return 0;

extra:
	/* free extras */
	for (;;) {
		struct list_head	*next;

		next = req->list.next;
		list_del(&req->list);
		usb_ep_free_request(ep, req);

		if (next == list)
			break;

		req = container_of(next, struct usb_request, list);
	}
	return 0;
}

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static int alloc_requests(struct eth_dev *dev, struct gether *link, unsigned n)
{
	int	status;

	spin_lock(&dev->req_lock);
	status = prealloc(&dev->tx_reqs, link->in_ep, n);
	if (status < 0)
		goto fail;
	status = prealloc(&dev->rx_reqs, link->out_ep, n);
	if (status < 0)
		goto fail;
	goto done;
fail:
	DBG(dev, "can't alloc requests\n");
done:
	spin_unlock(&dev->req_lock);
	return status;
}

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static void rx_fill(struct eth_dev *dev, gfp_t gfp_flags)
{
	struct usb_request	*req;
	struct usb_request	*tmp;
	unsigned long		flags;

	/* fill unused rxq slots with some skb */
	spin_lock_irqsave(&dev->req_lock, flags);
	list_for_each_entry_safe(req, tmp, &dev->rx_reqs, list) {
		list_del_init(&req->list);
		spin_unlock_irqrestore(&dev->req_lock, flags);

		if (rx_submit(dev, req, gfp_flags) < 0) {
			defer_kevent(dev, WORK_RX_MEMORY);
			return;
		}

		spin_lock_irqsave(&dev->req_lock, flags);
	}
	spin_unlock_irqrestore(&dev->req_lock, flags);
}

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static void eth_work(struct work_struct *work)
{
	struct eth_dev	*dev = container_of(work, struct eth_dev, work);

	if (test_and_clear_bit(WORK_RX_MEMORY, &dev->todo)) {
		if (netif_running(dev->net))
			rx_fill(dev, GFP_KERNEL);
	}

	if (dev->todo)
		DBG(dev, "work done, flags = 0x%lx\n", dev->todo);
}

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static void tx_complete(struct usb_ep *ep, struct usb_request *req)
{
	struct sk_buff	*skb = req->context;
	struct eth_dev	*dev = ep->driver_data;

	switch (req->status) {
	default:
		dev->net->stats.tx_errors++;
		VDBG(dev, "tx err %d\n", req->status);
		/* FALLTHROUGH */
	case -ECONNRESET:		/* unlink */
	case -ESHUTDOWN:		/* disconnect etc */
		dev_kfree_skb_any(skb);
		break;
	case 0:
		dev->net->stats.tx_bytes += skb->len;
		dev_consume_skb_any(skb);
	}
	dev->net->stats.tx_packets++;

	spin_lock(&dev->req_lock);
	list_add(&req->list, &dev->tx_reqs);
	spin_unlock(&dev->req_lock);

	atomic_dec(&dev->tx_qlen);
	if (netif_carrier_ok(dev->net))
		netif_wake_queue(dev->net);
}

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static inline int is_promisc(u16 cdc_filter)
{
	return cdc_filter & USB_CDC_PACKET_TYPE_PROMISCUOUS;
}

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static netdev_tx_t eth_start_xmit(struct sk_buff *skb,
					struct net_device *net)
{
	struct eth_dev		*dev = netdev_priv(net);
	int			length = 0;
	int			retval;
	struct usb_request	*req = NULL;
	unsigned long		flags;
	struct usb_ep		*in;
	u16			cdc_filter;

	spin_lock_irqsave(&dev->lock, flags);
	if (dev->port_usb) {
		in = dev->port_usb->in_ep;
		cdc_filter = dev->port_usb->cdc_filter;
	} else {
		in = NULL;
		cdc_filter = 0;
	}
	spin_unlock_irqrestore(&dev->lock, flags);

	if (skb && !in) {
		dev_kfree_skb_any(skb);
		return NETDEV_TX_OK;
	}

	/* apply outgoing CDC or RNDIS filters */
	if (skb && !is_promisc(cdc_filter)) {
		u8		*dest = skb->data;

		if (is_multicast_ether_addr(dest)) {
			u16	type;

			/* ignores USB_CDC_PACKET_TYPE_MULTICAST and host
                         * SET_ETHERNET_MULTICAST_FILTERS requests
                         */
			if (is_broadcast_ether_addr(dest))
				type = USB_CDC_PACKET_TYPE_BROADCAST;
			else
				type = USB_CDC_PACKET_TYPE_ALL_MULTICAST;
			if (!(cdc_filter & type)) {
				dev_kfree_skb_any(skb);
				return NETDEV_TX_OK;
			}
		}
		/* ignores USB_CDC_PACKET_TYPE_DIRECTED */
	}

	spin_lock_irqsave(&dev->req_lock, flags);
	/*
         * this freelist can be empty if an interrupt triggered disconnect()
         * and reconfigured the gadget (shutting down this queue) after the
         * network stack decided to xmit but before we got the spinlock.
         */
	if (list_empty(&dev->tx_reqs)) {
		spin_unlock_irqrestore(&dev->req_lock, flags);
		return NETDEV_TX_BUSY;
	}

	req = list_first_entry(&dev->tx_reqs, struct usb_request, list);
	list_del(&req->list);

	/* temporarily stop TX queue when the freelist empties */
	if (list_empty(&dev->tx_reqs))
		netif_stop_queue(net);
	spin_unlock_irqrestore(&dev->req_lock, flags);

	/* no buffer copies needed, unless the network stack did it
         * or the hardware can't use skb buffers.
         * or there's not enough space for extra headers we need
         */
	if (dev->wrap) {
		unsigned long	flags;

		spin_lock_irqsave(&dev->lock, flags);
		if (dev->port_usb)
			skb = dev->wrap(dev->port_usb, skb);
		spin_unlock_irqrestore(&dev->lock, flags);
		if (!skb) {
			/* Multi frame CDC protocols may store the frame for
                         * later which is not a dropped frame.
                         */
			if (dev->port_usb &&
					dev->port_usb->supports_multi_frame)
				goto multiframe;
			goto drop;
		}
	}

	length = skb->len;
	req->buf = skb->data;
	req->context = skb;
	req->complete = tx_complete;

	/* NCM requires no zlp if transfer is dwNtbInMaxSize */
	if (dev->port_usb &&
	    dev->port_usb->is_fixed &&
	    length == dev->port_usb->fixed_in_len &&
	    (length % in->maxpacket) == 0)
		req->zero = 0;
	else
		req->zero = 1;

	/* use zlp framing on tx for strict CDC-Ether conformance,
         * though any robust network rx path ignores extra padding.
         * and some hardware doesn't like to write zlps.
         */
	if (req->zero && !dev->zlp && (length % in->maxpacket) == 0)
		length++;

	req->length = length;

	retval = usb_ep_queue(in, req, GFP_ATOMIC);
	switch (retval) {
	default:
		DBG(dev, "tx queue err %d\n", retval);
		break;
	case 0:
		netif_trans_update(net);
		atomic_inc(&dev->tx_qlen);
	}

	if (retval) {
		dev_kfree_skb_any(skb);
drop:
		dev->net->stats.tx_dropped++;
multiframe:
		spin_lock_irqsave(&dev->req_lock, flags);
		if (list_empty(&dev->tx_reqs))
			netif_start_queue(net);
		list_add(&req->list, &dev->tx_reqs);
		spin_unlock_irqrestore(&dev->req_lock, flags);
	}
	return NETDEV_TX_OK;
}

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3.81%
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1.73%
1
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0.69%
2
16.67%
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1
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/*-------------------------------------------------------------------------*/



static void eth_start(struct eth_dev *dev, gfp_t gfp_flags)
{
	DBG(dev, "%s\n", __func__);

	/* fill the rx queue */
	rx_fill(dev, gfp_flags);

	/* and open the tx floodgates */
	atomic_set(&dev->tx_qlen, 0);
	netif_wake_queue(dev->net);
}

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static int eth_open(struct net_device *net)
{
	struct eth_dev	*dev = netdev_priv(net);
	struct gether	*link;

	DBG(dev, "%s\n", __func__);
	if (netif_carrier_ok(dev->net))
		eth_start(dev, GFP_KERNEL);

	spin_lock_irq(&dev->lock);
	link = dev->port_usb;
	if (link && link->open)
		link->open(link);
	spin_unlock_irq(&dev->lock);

	return 0;
}

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static int eth_stop(struct net_device *net)
{
	struct eth_dev	*dev = netdev_priv(net);
	unsigned long	flags;

	VDBG(dev, "%s\n", __func__);
	netif_stop_queue(net);

	DBG(dev, "stop stats: rx/tx %ld/%ld, errs %ld/%ld\n",
		dev->net->stats.rx_packets, dev->net->stats.tx_packets,
		dev->net->stats.rx_errors, dev->net->stats.tx_errors
		);

	/* ensure there are no more active requests */
	spin_lock_irqsave(&dev->lock, flags);
	if (dev->port_usb) {
		struct gether	*link = dev->port_usb;
		const struct usb_endpoint_descriptor *in;
		const struct usb_endpoint_descriptor *out;

		if (link->close)
			link->close(link);

		/* NOTE:  we have no abort-queue primitive we could use
                 * to cancel all pending I/O.  Instead, we disable then
                 * reenable the endpoints ... this idiom may leave toggle
                 * wrong, but that's a self-correcting error.
                 *
                 * REVISIT:  we *COULD* just let the transfers complete at
                 * their own pace; the network stack can handle old packets.
                 * For the moment we leave this here, since it works.
                 */
		in = link->in_ep->desc;
		out = link->out_ep->desc;
		usb_ep_disable(link->in_ep);
		usb_ep_disable(link->out_ep);
		if (netif_carrier_ok(net)) {
			DBG(dev, "host still using in/out endpoints\n");
			link->in_ep->desc = in;
			link->out_ep->desc = out;
			usb_ep_enable(link->in_ep);
			usb_ep_enable(link->out_ep);
		}
	}
	spin_unlock_irqrestore(&dev->lock, flags);

	return 0;
}

Contributors
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David Brownell
177
80.09%
1
50.00%
Michael Grzeschik
44
19.91%
1
50.00%
Total
221
100.00%
2
100.00%

/*-------------------------------------------------------------------------*/



static int get_ether_addr(const char *str, u8 *dev_addr)
{
	if (str) {
		unsigned	i;

		for (i = 0; i < 6; i++) {
			unsigned char num;

			if ((*str == '.') || (*str == ':'))
				str++;
			num = hex_to_bin(*str++) << 4;
			num |= hex_to_bin(*str++);
			dev_addr [i] = num;
		}
		if (is_valid_ether_addr(dev_addr))
			return 0;
	}
	eth_random_addr(dev_addr);
	return 1;
}

Contributors
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David Brownell
104
97.20%
1
33.33%
Andy Shevchenko
2
1.87%
1
33.33%
Joe Perches
1
0.93%
1
33.33%
Total
107
100.00%
3
100.00%



static int get_ether_addr_str(u8 dev_addr[ETH_ALEN], char *str, int len)
{
	if (len < 18)
		return -EINVAL;

	snprintf(str, len, "%pM", dev_addr);
	return 18;
}

Contributors
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Tokens
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CommitProp
Andrzej Pietrasiewicz
42
97.67%
1
50.00%
Andy Shevchenko
1
2.33%
1
50.00%
Total
43
100.00%
2
100.00%


static const struct net_device_ops eth_netdev_ops = {
	.ndo_open		= eth_open,
	.ndo_stop		= eth_stop,
	.ndo_start_xmit		= eth_start_xmit,
	.ndo_set_mac_address 	= eth_mac_addr,
	.ndo_validate_addr	= eth_validate_addr,
};


static struct device_type gadget_type = {
	.name	= "gadget",
};

/**
 * gether_setup_name - initialize one ethernet-over-usb link
 * @g: gadget to associated with these links
 * @ethaddr: NULL, or a buffer in which the ethernet address of the
 *      host side of the link is recorded
 * @netname: name for network device (for example, "usb")
 * Context: may sleep
 *
 * This sets up the single network link that may be exported by a
 * gadget driver using this framework.  The link layer addresses are
 * set up using module parameters.
 *
 * Returns an eth_dev pointer on success, or an ERR_PTR on failure.
 */


struct eth_dev *gether_setup_name(struct usb_gadget *g,
		const char *dev_addr, const char *host_addr,
		u8 ethaddr[ETH_ALEN], unsigned qmult, const char *netname)
{
	struct eth_dev		*dev;
	struct net_device	*net;
	int			status;

	net = alloc_etherdev(sizeof *dev);
	if (!net)
		return ERR_PTR(-ENOMEM);

	dev = netdev_priv(net);
	spin_lock_init(&dev->lock);
	spin_lock_init(&dev->req_lock);
	INIT_WORK(&dev->work, eth_work);
	INIT_LIST_HEAD(&dev->tx_reqs);
	INIT_LIST_HEAD(&dev->rx_reqs);

	skb_queue_head_init(&dev->rx_frames);

	/* network device setup */
	dev->net = net;
	dev->qmult = qmult;
	snprintf(net->name, sizeof(net->name), "%s%%d", netname);

	if (get_ether_addr(dev_addr, net->dev_addr))
		dev_warn(&g->dev,
			"using random %s ethernet address\n", "self");
	if (get_ether_addr(host_addr, dev->host_mac))
		dev_warn(&g->dev,
			"using random %s ethernet address\n", "host");

	if (ethaddr)
		memcpy(ethaddr, dev->host_mac, ETH_ALEN);

	net->netdev_ops = &eth_netdev_ops;

	net->ethtool_ops = &ops;

	/* MTU range: 14 - 15412 */
	net->min_mtu = ETH_HLEN;
	net->max_mtu = GETHER_MAX_ETH_FRAME_LEN;

	dev->gadget = g;
	SET_NETDEV_DEV(net, &g->dev);
	SET_NETDEV_DEVTYPE(net, &gadget_type);

	status = register_netdev(net);
	if (status < 0) {
		dev_dbg(&g->dev, "register_netdev failed, %d\n", status);
		free_netdev(net);
		dev = ERR_PTR(status);
	} else {
		INFO(dev, "MAC %pM\n", net->dev_addr);
		INFO(dev, "HOST MAC %pM\n", dev->host_mac);

		/*
                 * two kinds of host-initiated state changes:
                 *  - iff DATA transfer is active, carrier is "on"
                 *  - tx queueing enabled if open *and* carrier is "on"
                 */
		netif_carrier_off(net);
	}

	return dev;
}
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David Brownell
250
72.89%
1
8.33%
Andrzej Pietrasiewicz
20
5.83%
2
16.67%
Mike Lockwood
17
4.96%
1
8.33%
Sebastian Andrzej Siewior
14
4.08%
1
8.33%
Jarod Wilson
13
3.79%
1
8.33%
Marcel Holtmann
8
2.33%
1
8.33%
Brian Niebuhr
8
2.33%
1
8.33%
Kevin Cernekee
5
1.46%
1
8.33%
Stephen Hemminger
3
0.87%
1
8.33%
Wilfried Klaebe
3
0.87%
1
8.33%
Johannes Berg
2
0.58%
1
8.33%
Total
343
100.00%
12
100.00%

EXPORT_SYMBOL_GPL(gether_setup_name);



struct net_device *gether_setup_name_default(const char *netname)
{
	struct net_device	*net;
	struct eth_dev		*dev;

	net = alloc_etherdev(sizeof(*dev));
	if (!net)
		return ERR_PTR(-ENOMEM);

	dev = netdev_priv(net);
	spin_lock_init(&dev->lock);
	spin_lock_init(&dev->req_lock);
	INIT_WORK(&dev->work, eth_work);
	INIT_LIST_HEAD(&dev->tx_reqs);
	INIT_LIST_HEAD(&dev->rx_reqs);

	skb_queue_head_init(&dev->rx_frames);

	/* network device setup */
	dev->net = net;
	dev->qmult = QMULT_DEFAULT;
	snprintf(net->name, sizeof(net->name), "%s%%d", netname);

	eth_random_addr(dev->dev_mac);
	pr_warn("using random %s ethernet address\n", "self");
	eth_random_addr(dev->host_mac);
	pr_warn("using random %s ethernet address\n", "host");

	net->netdev_ops = &eth_netdev_ops;

	net->ethtool_ops = &ops;
	SET_NETDEV_DEVTYPE(net, &gadget_type);

	return net;
}
Contributors
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Andrzej Pietrasiewicz
183
98.39%
1
50.00%
Wilfried Klaebe
3
1.61%
1
50.00%
Total
186
100.00%
2
100.00%

EXPORT_SYMBOL_GPL(gether_setup_name_default);



int gether_register_netdev(struct net_device *net)
{
	struct eth_dev *dev;
	struct usb_gadget *g;
	struct sockaddr sa;
	int status;

	if (!net->dev.parent)
		return -EINVAL;
	dev = netdev_priv(net);
	g = dev->gadget;
	status = register_netdev(net);
	if (status < 0) {
		dev_dbg(&g->dev, "register_netdev failed, %d\n", status);
		return status;
	} else {
		INFO(dev, "HOST MAC %pM\n", dev->host_mac);

		/* two kinds of host-initiated state changes:
                 *  - iff DATA transfer is active, carrier is "on"
                 *  - tx queueing enabled if open *and* carrier is "on"
                 */
		netif_carrier_off(net);
	}
	sa.sa_family = net->type;
	memcpy(sa.sa_data, dev->dev_mac, ETH_ALEN);
	rtnl_lock();
	status = dev_set_mac_address(net, &sa);
	rtnl_unlock();
	if (status)
		pr_warn("cannot set self ethernet address: %d\n", status);
	else
		INFO(dev, "MAC %pM\n", dev->dev_mac);

	return status;
}
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Andrzej Pietrasiewicz
166
100.00%
1
100.00%
Total
166
100.00%
1
100.00%

EXPORT_SYMBOL_GPL(gether_register_netdev);



void gether_set_gadget(struct net_device *net, struct usb_gadget *g)
{
	struct eth_dev *dev;

	dev = netdev_priv(net);
	dev->gadget = g;
	SET_NETDEV_DEV(net, &g->dev);
}
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Andrzej Pietrasiewicz
43
100.00%
1
100.00%
Total
43
100.00%
1
100.00%

EXPORT_SYMBOL_GPL(gether_set_gadget);



int gether_set_dev_addr(struct net_device *net, const char *dev_addr)
{
	struct eth_dev *dev;
	u8 new_addr[ETH_ALEN];

	dev = netdev_priv(net);
	if (get_ether_addr(dev_addr, new_addr))
		return -EINVAL;
	memcpy(dev->dev_mac, new_addr, ETH_ALEN);
	return 0;
}
Contributors
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Andrzej Pietrasiewicz
60
100.00%
1
100.00%
Total
60
100.00%
1
100.00%

EXPORT_SYMBOL_GPL(gether_set_dev_addr);



int gether_get_dev_addr(struct net_device *net, char *dev_addr, int len)
{
	struct eth_dev *dev;
	int ret;

	dev = netdev_priv(net);
	ret = get_ether_addr_str(dev->dev_mac, dev_addr, len);
	if (ret + 1 < len) {
		dev_addr[ret++] = '\n';
		dev_addr[ret] = '\0';
	}

	return ret;
}
Contributors
Person
Tokens
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Andrzej Pietrasiewicz
40
54.79%
1
50.00%
Krzysztof Opasiak
33
45.21%
1
50.00%
Total
73
100.00%
2
100.00%

EXPORT_SYMBOL_GPL(gether_get_dev_addr);



int gether_set_host_addr(struct net_device *net, const char *host_addr)
{
	struct eth_dev *dev;
	u8 new_addr[ETH_ALEN];

	dev = netdev_priv(net);
	if (get_ether_addr(host_addr, new_addr))
		return -EINVAL;
	memcpy(dev->host_mac, new_addr, ETH_ALEN);
	return 0;
}
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Andrzej Pietrasiewicz
60
100.00%
1
100.00%
Total
60
100.00%
1
100.00%

EXPORT_SYMBOL_GPL(gether_set_host_addr);



int gether_get_host_addr(struct net_device *net, char *host_addr, int len)
{
	struct eth_dev *dev;
	int ret;

	dev = netdev_priv(net);
	ret = get_ether_addr_str(dev->host_mac, host_addr, len);
	if (ret + 1 < len) {
		host_addr[ret++] = '\n';
		host_addr[ret] = '\0';
	}

	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrzej Pietrasiewicz
40
54.79%
1
50.00%
Krzysztof Opasiak
33
45.21%
1
50.00%
Total
73
100.00%
2
100.00%

EXPORT_SYMBOL_GPL(gether_get_host_addr);



int gether_get_host_addr_cdc(struct net_device *net, char *host_addr, int len)
{
	struct eth_dev *dev;

	if (len < 13)
		return -EINVAL;

	dev = netdev_priv(net);
	snprintf(host_addr, len, "%pm", dev->host_mac);

	return strlen(host_addr);
}
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Andrzej Pietrasiewicz
58
100.00%
1
100.00%
Total
58
100.00%
1
100.00%

EXPORT_SYMBOL_GPL(gether_get_host_addr_cdc);



void gether_get_host_addr_u8(struct net_device *net, u8 host_mac[ETH_ALEN])
{
	struct eth_dev *dev;

	dev = netdev_priv(net);
	memcpy(host_mac, dev->host_mac, ETH_ALEN);
}
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Andrzej Pietrasiewicz
39
100.00%
1
100.00%
Total
39
100.00%
1
100.00%

EXPORT_SYMBOL_GPL(gether_get_host_addr_u8);



void gether_set_qmult(struct net_device *net, unsigned qmult)
{
	struct eth_dev *dev;

	dev = netdev_priv(net);
	dev->qmult = qmult;
}
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Andrzej Pietrasiewicz
31
100.00%
1
100.00%
Total
31
100.00%
1
100.00%

EXPORT_SYMBOL_GPL(gether_set_qmult);



unsigned gether_get_qmult(struct net_device *net)
{
	struct eth_dev *dev;

	dev = netdev_priv(net);
	return dev->qmult;
}
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27
100.00%
1
100.00%
Total
27
100.00%
1
100.00%

EXPORT_SYMBOL_GPL(gether_get_qmult);



int gether_get_ifname(struct net_device *net, char *name, int len)
{
	int ret;

	rtnl_lock();
	ret = snprintf(name, len, "%s\n", netdev_name(net));
	rtnl_unlock();
	return ret < len ? ret : len;
}
Contributors
Person
Tokens
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CommitProp
Andrzej Pietrasiewicz
34
66.67%
1
50.00%
Krzysztof Opasiak
17
33.33%
1
50.00%
Total
51
100.00%
2
100.00%

EXPORT_SYMBOL_GPL(gether_get_ifname);

/**
 * gether_cleanup - remove Ethernet-over-USB device
 * Context: may sleep
 *
 * This is called to free all resources allocated by @gether_setup().
 */


void gether_cleanup(struct eth_dev *dev)
{
	if (!dev)
		return;

	unregister_netdev(dev->net);
	flush_work(&dev->work);
	free_netdev(dev->net);
}
Contributors
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David Brownell
23
60.53%
1
25.00%
Sebastian Andrzej Siewior
8
21.05%
1
25.00%
Tejun Heo
7
18.42%
2
50.00%
Total
38
100.00%
4
100.00%

EXPORT_SYMBOL_GPL(gether_cleanup);

/**
 * gether_connect - notify network layer that USB link is active
 * @link: the USB link, set up with endpoints, descriptors matching
 *      current device speed, and any framing wrapper(s) set up.
 * Context: irqs blocked
 *
 * This is called to activate endpoints and let the network layer know
 * the connection is active ("carrier detect").  It may cause the I/O
 * queues to open and start letting network packets flow, but will in
 * any case activate the endpoints so that they respond properly to the
 * USB host.
 *
 * Verify net_device pointer returned using IS_ERR().  If it doesn't
 * indicate some error code (negative errno), ep->driver_data values
 * have been overwritten.
 */


struct net_device *gether_connect(struct gether *link)
{
	struct eth_dev		*dev = link->ioport;
	int			result = 0;

	if (!dev)
		return ERR_PTR(-EINVAL);

	link->in_ep->driver_data = dev;
	result = usb_ep_enable(link->in_ep);
	if (result != 0) {
		DBG(dev, "enable %s --> %d\n",
			link->in_ep->name, result);
		goto fail0;
	}

	link->out_ep->driver_data = dev;
	result = usb_ep_enable(link->out_ep);
	if (result != 0) {
		DBG(dev, "enable %s --> %d\n",
			link->out_ep->name, result);
		goto fail1;
	}

	if (result == 0)
		result = alloc_requests(dev, link, qlen(dev->gadget,
					dev->qmult));

	if (result == 0) {
		dev->zlp = link->is_zlp_ok;
		dev->no_skb_reserve = gadget_avoids_skb_reserve(dev->gadget);
		DBG(dev, "qlen %d\n", qlen(dev->gadget, dev->qmult));

		dev->header_len = link->header_len;
		dev->unwrap = link->unwrap;
		dev->wrap = link->wrap;

		spin_lock(&dev->lock);
		dev->port_usb = link;
		if (netif_running(dev->net)) {
			if (link->open)
				link->open(link);
		} else {
			if (link->close)
				link->close(link);
		}
		spin_unlock(&dev->lock);

		netif_carrier_on(dev->net);
		if (netif_running(dev->net))
			eth_start(dev, GFP_ATOMIC);

	/* on error, disable any endpoints  */
	} else {
		(void) usb_ep_disable(link->out_ep);
fail1:
		(void) usb_ep_disable(link->in_ep);
	}
fail0:
	/* caller is responsible for cleanup on error */
	if (result < 0)
		return ERR_PTR(result);
	return dev->net;
}
Contributors
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David Brownell
328
93.71%
2
33.33%
Andrzej Pietrasiewicz
8
2.29%
1
16.67%
Yoshihiro Shimoda
6
1.71%
1
16.67%
Dmitry Osipenko
5
1.43%
1
16.67%
Sebastian Andrzej Siewior
3
0.86%
1
16.67%
Total
350
100.00%
6
100.00%

EXPORT_SYMBOL_GPL(gether_connect);

/**
 * gether_disconnect - notify network layer that USB link is inactive
 * @link: the USB link, on which gether_connect() was called
 * Context: irqs blocked
 *
 * This is called to deactivate endpoints and let the network layer know
 * the connection went inactive ("no carrier").
 *
 * On return, the state is as if gether_connect() had never been called.
 * The endpoints are inactive, and accordingly without active USB I/O.
 * Pointers to endpoint descriptors and endpoint private data are nulled.
 */


void gether_disconnect(struct gether *link)
{
	struct eth_dev		*dev = link->ioport;
	struct usb_request	*req;
	struct usb_request	*tmp;

	WARN_ON(!dev);
	if (!dev)
		return;

	DBG(dev, "%s\n", __func__);

	netif_stop_queue(dev->net);
	netif_carrier_off(dev->net);

	/* disable endpoints, forcing (synchronous) completion
         * of all pending i/o.  then free the request objects
         * and forget about the endpoints.
         */
	usb_ep_disable(link->in_ep);
	spin_lock(&dev->req_lock);
	list_for_each_entry_safe(req, tmp, &dev->tx_reqs, list) {
		list_del(&req->list);

		spin_unlock(&dev->req_lock);
		usb_ep_free_request(link->in_ep, req);
		spin_lock(&dev->req_lock);
	}
	spin_unlock(&dev->req_lock);
	link->in_ep->desc = NULL;

	usb_ep_disable(link->out_ep);
	spin_lock(&dev->req_lock);
	list_for_each_entry_safe(req, tmp, &dev->rx_reqs, list) {
		list_del(&req->list);

		spin_unlock(&dev->req_lock);
		usb_ep_free_request(link->out_ep, req);
		spin_lock(&dev->req_lock);
	}
	spin_unlock(&dev->req_lock);
	link->out_ep->desc = NULL;

	/* finish forgetting about this USB link episode */
	dev->header_len = 0;
	dev->unwrap = NULL;
	dev->wrap = NULL;

	spin_lock(&dev->lock);
	dev->port_usb = NULL;
	spin_unlock(&dev->lock);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
David Brownell
237
91.86%
1
33.33%
Felipe Balbi
19
7.36%
1
33.33%
Tatyana Brokhman
2
0.78%
1
33.33%
Total
258
100.00%
3
100.00%

EXPORT_SYMBOL_GPL(gether_disconnect);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Brownell");
Overall Contributors
Person
Tokens
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Commits
CommitProp
David Brownell
3189
63.51%
3
5.66%
Andrzej Pietrasiewicz
937
18.66%
3
5.66%
Felipe Balbi
311
6.19%
4
7.55%
Brian Niebuhr
127
2.53%
1
1.89%
Krzysztof Opasiak
83
1.65%
1
1.89%
Yauheni Kaliuta
59
1.18%
1
1.89%
Michael Grzeschik
44
0.88%
1
1.89%
Stephen Hemminger
41
0.82%
4
7.55%
Sebastian Andrzej Siewior
29
0.58%
2
3.77%
Jim Baxter
22
0.44%
1
1.89%
Marcel Holtmann
20
0.40%
1
1.89%
Yoshihiro Shimoda
19
0.38%
1
1.89%
Mike Lockwood
17
0.34%
1
1.89%
Torsten Polle
15
0.30%
2
3.77%
Jarod Wilson
13
0.26%
1
1.89%
Greg Kroah-Hartman
12
0.24%
3
5.66%
Tejun Heo
10
0.20%
3
5.66%
Paul Zimmerman
9
0.18%
1
1.89%
Jiri Pirko
8
0.16%
1
1.89%
Mike Looijmans
6
0.12%
1
1.89%
Wilfried Klaebe
6
0.12%
1
1.89%
Dmitry Osipenko
5
0.10%
1
1.89%
Kevin Cernekee
5
0.10%
1
1.89%
Weinn Jheng
5
0.10%
1
1.89%
Harish Jenny K N
4
0.08%
1
1.89%
Peter Chen
4
0.08%
1
1.89%
Patrick McHardy
4
0.08%
2
3.77%
Florian Westphal
3
0.06%
1
1.89%
Ian Coolidge
3
0.06%
1
1.89%
Andy Shevchenko
3
0.06%
2
3.77%
Jonathan McDowell
2
0.04%
1
1.89%
Johannes Berg
2
0.04%
1
1.89%
Tatyana Brokhman
2
0.04%
1
1.89%
Dan Carpenter
1
0.02%
1
1.89%
Joe Perches
1
0.02%
1
1.89%
Total
5021
100.00%
53
100.00%
Directory: drivers/usb/gadget/function

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