[linux-2.6-block.git] / drivers / net / mhi_net.c

// SPDX-License-Identifier: GPL-2.0-or-later
/* MHI Network driver - Network over MHI bus
 *
 * Copyright (C) 2020 Linaro Ltd <loic.poulain@linaro.org>
 */

#include <linux/if_arp.h>
#include <linux/mhi.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/u64_stats_sync.h>

#define MHI_NET_MIN_MTU		ETH_MIN_MTU
#define MHI_NET_MAX_MTU		0xffff
#define MHI_NET_DEFAULT_MTU	0x4000

struct mhi_net_stats {
	u64_stats_t rx_packets;
	u64_stats_t rx_bytes;
	u64_stats_t rx_errors;
	u64_stats_t rx_dropped;
	u64_stats_t tx_packets;
	u64_stats_t tx_bytes;
	u64_stats_t tx_errors;
	u64_stats_t tx_dropped;
	atomic_t rx_queued;
	struct u64_stats_sync tx_syncp;
	struct u64_stats_sync rx_syncp;
};

struct mhi_net_dev {
	struct mhi_device *mdev;
	struct net_device *ndev;
	struct delayed_work rx_refill;
	struct mhi_net_stats stats;
	u32 rx_queue_sz;
};

static int mhi_ndo_open(struct net_device *ndev)
{
	struct mhi_net_dev *mhi_netdev = netdev_priv(ndev);

	/* Feed the rx buffer pool */
	schedule_delayed_work(&mhi_netdev->rx_refill, 0);

	/* Carrier is established via out-of-band channel (e.g. qmi) */
	netif_carrier_on(ndev);

	netif_start_queue(ndev);

	return 0;
}

static int mhi_ndo_stop(struct net_device *ndev)
{
	struct mhi_net_dev *mhi_netdev = netdev_priv(ndev);

	netif_stop_queue(ndev);
	netif_carrier_off(ndev);
	cancel_delayed_work_sync(&mhi_netdev->rx_refill);

	return 0;
}

static int mhi_ndo_xmit(struct sk_buff *skb, struct net_device *ndev)
{
	struct mhi_net_dev *mhi_netdev = netdev_priv(ndev);
	struct mhi_device *mdev = mhi_netdev->mdev;
	int err;

	err = mhi_queue_skb(mdev, DMA_TO_DEVICE, skb, skb->len, MHI_EOT);
	if (unlikely(err)) {
		net_err_ratelimited("%s: Failed to queue TX buf (%d)\n",
				    ndev->name, err);

		u64_stats_update_begin(&mhi_netdev->stats.tx_syncp);
		u64_stats_inc(&mhi_netdev->stats.tx_dropped);
		u64_stats_update_end(&mhi_netdev->stats.tx_syncp);

		/* drop the packet */
		dev_kfree_skb_any(skb);
	}

	if (mhi_queue_is_full(mdev, DMA_TO_DEVICE))
		netif_stop_queue(ndev);

	return NETDEV_TX_OK;
}

static void mhi_ndo_get_stats64(struct net_device *ndev,
				struct rtnl_link_stats64 *stats)
{
	struct mhi_net_dev *mhi_netdev = netdev_priv(ndev);
	unsigned int start;

	do {
		start = u64_stats_fetch_begin_irq(&mhi_netdev->stats.rx_syncp);
		stats->rx_packets = u64_stats_read(&mhi_netdev->stats.rx_packets);
		stats->rx_bytes = u64_stats_read(&mhi_netdev->stats.rx_bytes);
		stats->rx_errors = u64_stats_read(&mhi_netdev->stats.rx_errors);
		stats->rx_dropped = u64_stats_read(&mhi_netdev->stats.rx_dropped);
	} while (u64_stats_fetch_retry_irq(&mhi_netdev->stats.rx_syncp, start));

	do {
		start = u64_stats_fetch_begin_irq(&mhi_netdev->stats.tx_syncp);
		stats->tx_packets = u64_stats_read(&mhi_netdev->stats.tx_packets);
		stats->tx_bytes = u64_stats_read(&mhi_netdev->stats.tx_bytes);
		stats->tx_errors = u64_stats_read(&mhi_netdev->stats.tx_errors);
		stats->tx_dropped = u64_stats_read(&mhi_netdev->stats.tx_dropped);
	} while (u64_stats_fetch_retry_irq(&mhi_netdev->stats.tx_syncp, start));
}

static const struct net_device_ops mhi_netdev_ops = {
	.ndo_open               = mhi_ndo_open,
	.ndo_stop               = mhi_ndo_stop,
	.ndo_start_xmit         = mhi_ndo_xmit,
	.ndo_get_stats64	= mhi_ndo_get_stats64,
};

static void mhi_net_setup(struct net_device *ndev)
{
	ndev->header_ops = NULL;  /* No header */
	ndev->type = ARPHRD_NONE; /* QMAP... */
	ndev->hard_header_len = 0;
	ndev->addr_len = 0;
	ndev->flags = IFF_POINTOPOINT | IFF_NOARP;
	ndev->netdev_ops = &mhi_netdev_ops;
	ndev->mtu = MHI_NET_DEFAULT_MTU;
	ndev->min_mtu = MHI_NET_MIN_MTU;
	ndev->max_mtu = MHI_NET_MAX_MTU;
	ndev->tx_queue_len = 1000;
}

static void mhi_net_dl_callback(struct mhi_device *mhi_dev,
				struct mhi_result *mhi_res)
{
	struct mhi_net_dev *mhi_netdev = dev_get_drvdata(&mhi_dev->dev);
	struct sk_buff *skb = mhi_res->buf_addr;
	int remaining;

	remaining = atomic_dec_return(&mhi_netdev->stats.rx_queued);

	if (unlikely(mhi_res->transaction_status)) {
		dev_kfree_skb_any(skb);

		/* MHI layer stopping/resetting the DL channel */
		if (mhi_res->transaction_status == -ENOTCONN)
			return;

		u64_stats_update_begin(&mhi_netdev->stats.rx_syncp);
		u64_stats_inc(&mhi_netdev->stats.rx_errors);
		u64_stats_update_end(&mhi_netdev->stats.rx_syncp);
	} else {
		u64_stats_update_begin(&mhi_netdev->stats.rx_syncp);
		u64_stats_inc(&mhi_netdev->stats.rx_packets);
		u64_stats_add(&mhi_netdev->stats.rx_bytes, mhi_res->bytes_xferd);
		u64_stats_update_end(&mhi_netdev->stats.rx_syncp);

		skb->protocol = htons(ETH_P_MAP);
		skb_put(skb, mhi_res->bytes_xferd);
		netif_rx(skb);
	}

	/* Refill if RX buffers queue becomes low */
	if (remaining <= mhi_netdev->rx_queue_sz / 2)
		schedule_delayed_work(&mhi_netdev->rx_refill, 0);
}

static void mhi_net_ul_callback(struct mhi_device *mhi_dev,
				struct mhi_result *mhi_res)
{
	struct mhi_net_dev *mhi_netdev = dev_get_drvdata(&mhi_dev->dev);
	struct net_device *ndev = mhi_netdev->ndev;
	struct mhi_device *mdev = mhi_netdev->mdev;
	struct sk_buff *skb = mhi_res->buf_addr;

	/* Hardware has consumed the buffer, so free the skb (which is not
	 * freed by the MHI stack) and perform accounting.
	 */
	dev_consume_skb_any(skb);

	u64_stats_update_begin(&mhi_netdev->stats.tx_syncp);
	if (unlikely(mhi_res->transaction_status)) {

		/* MHI layer stopping/resetting the UL channel */
		if (mhi_res->transaction_status == -ENOTCONN) {
			u64_stats_update_end(&mhi_netdev->stats.tx_syncp);
			return;
		}

		u64_stats_inc(&mhi_netdev->stats.tx_errors);
	} else {
		u64_stats_inc(&mhi_netdev->stats.tx_packets);
		u64_stats_add(&mhi_netdev->stats.tx_bytes, mhi_res->bytes_xferd);
	}
	u64_stats_update_end(&mhi_netdev->stats.tx_syncp);

	if (netif_queue_stopped(ndev) && !mhi_queue_is_full(mdev, DMA_TO_DEVICE))
		netif_wake_queue(ndev);
}

static void mhi_net_rx_refill_work(struct work_struct *work)
{
	struct mhi_net_dev *mhi_netdev = container_of(work, struct mhi_net_dev,
						      rx_refill.work);
	struct net_device *ndev = mhi_netdev->ndev;
	struct mhi_device *mdev = mhi_netdev->mdev;
	int size = READ_ONCE(ndev->mtu);
	struct sk_buff *skb;
	int err;

	while (atomic_read(&mhi_netdev->stats.rx_queued) < mhi_netdev->rx_queue_sz) {
		skb = netdev_alloc_skb(ndev, size);
		if (unlikely(!skb))
			break;

		err = mhi_queue_skb(mdev, DMA_FROM_DEVICE, skb, size, MHI_EOT);
		if (unlikely(err)) {
			net_err_ratelimited("%s: Failed to queue RX buf (%d)\n",
					    ndev->name, err);
			kfree_skb(skb);
			break;
		}

		atomic_inc(&mhi_netdev->stats.rx_queued);

		/* Do not hog the CPU if rx buffers are consumed faster than
		 * queued (unlikely).
		 */
		cond_resched();
	}

	/* If we're still starved of rx buffers, reschedule later */
	if (unlikely(!atomic_read(&mhi_netdev->stats.rx_queued)))
		schedule_delayed_work(&mhi_netdev->rx_refill, HZ / 2);
}

static int mhi_net_probe(struct mhi_device *mhi_dev,
			 const struct mhi_device_id *id)
{
	const char *netname = (char *)id->driver_data;
	struct device *dev = &mhi_dev->dev;
	struct mhi_net_dev *mhi_netdev;
	struct net_device *ndev;
	int err;

	ndev = alloc_netdev(sizeof(*mhi_netdev), netname, NET_NAME_PREDICTABLE,
			    mhi_net_setup);
	if (!ndev)
		return -ENOMEM;

	mhi_netdev = netdev_priv(ndev);
	dev_set_drvdata(dev, mhi_netdev);
	mhi_netdev->ndev = ndev;
	mhi_netdev->mdev = mhi_dev;
	SET_NETDEV_DEV(ndev, &mhi_dev->dev);

	/* All MHI net channels have 128 ring elements (at least for now) */
	mhi_netdev->rx_queue_sz = 128;

	INIT_DELAYED_WORK(&mhi_netdev->rx_refill, mhi_net_rx_refill_work);
	u64_stats_init(&mhi_netdev->stats.rx_syncp);
	u64_stats_init(&mhi_netdev->stats.tx_syncp);

	/* Start MHI channels */
	err = mhi_prepare_for_transfer(mhi_dev);
	if (err)
		goto out_err;

	err = register_netdev(ndev);
	if (err)
		goto out_err;

	return 0;

out_err:
	free_netdev(ndev);
	return err;
}

static void mhi_net_remove(struct mhi_device *mhi_dev)
{
	struct mhi_net_dev *mhi_netdev = dev_get_drvdata(&mhi_dev->dev);

	unregister_netdev(mhi_netdev->ndev);

	mhi_unprepare_from_transfer(mhi_netdev->mdev);

	free_netdev(mhi_netdev->ndev);
}

static const struct mhi_device_id mhi_net_id_table[] = {
	{ .chan = "IP_HW0", .driver_data = (kernel_ulong_t)"mhi_hwip%d" },
	{ .chan = "IP_SW0", .driver_data = (kernel_ulong_t)"mhi_swip%d" },
	{}
};
MODULE_DEVICE_TABLE(mhi, mhi_net_id_table);

static struct mhi_driver mhi_net_driver = {
	.probe = mhi_net_probe,
	.remove = mhi_net_remove,
	.dl_xfer_cb = mhi_net_dl_callback,
	.ul_xfer_cb = mhi_net_ul_callback,
	.id_table = mhi_net_id_table,
	.driver = {
		.name = "mhi_net",
		.owner = THIS_MODULE,
	},
};

module_mhi_driver(mhi_net_driver);

MODULE_AUTHOR("Loic Poulain <loic.poulain@linaro.org>");
MODULE_DESCRIPTION("Network over MHI");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
3ffec6a1 LP	1	// SPDX-License-Identifier: GPL-2.0-or-later
	2	/* MHI Network driver - Network over MHI bus
	3	*
	4	* Copyright (C) 2020 Linaro Ltd <loic.poulain@linaro.org>
	5	*/
	6
	7	#include <linux/if_arp.h>
	8	#include <linux/mhi.h>
	9	#include <linux/mod_devicetable.h>
	10	#include <linux/module.h>
	11	#include <linux/netdevice.h>
	12	#include <linux/skbuff.h>
	13	#include <linux/u64_stats_sync.h>
	14
	15	#define MHI_NET_MIN_MTU ETH_MIN_MTU
	16	#define MHI_NET_MAX_MTU 0xffff
	17	#define MHI_NET_DEFAULT_MTU 0x4000
	18
	19	struct mhi_net_stats {
	20	u64_stats_t rx_packets;
	21	u64_stats_t rx_bytes;
	22	u64_stats_t rx_errors;
	23	u64_stats_t rx_dropped;
	24	u64_stats_t tx_packets;
	25	u64_stats_t tx_bytes;
	26	u64_stats_t tx_errors;
	27	u64_stats_t tx_dropped;
	28	atomic_t rx_queued;
	29	struct u64_stats_sync tx_syncp;
	30	struct u64_stats_sync rx_syncp;
	31	};
	32
	33	struct mhi_net_dev {
	34	struct mhi_device *mdev;
	35	struct net_device *ndev;
	36	struct delayed_work rx_refill;
	37	struct mhi_net_stats stats;
	38	u32 rx_queue_sz;
	39	};
	40
	41	static int mhi_ndo_open(struct net_device *ndev)
	42	{
	43	struct mhi_net_dev *mhi_netdev = netdev_priv(ndev);
	44
	45	/* Feed the rx buffer pool */
	46	schedule_delayed_work(&mhi_netdev->rx_refill, 0);
	47
	48	/* Carrier is established via out-of-band channel (e.g. qmi) */
	49	netif_carrier_on(ndev);
	50
	51	netif_start_queue(ndev);
	52
	53	return 0;
	54	}
	55
	56	static int mhi_ndo_stop(struct net_device *ndev)
	57	{
	58	struct mhi_net_dev *mhi_netdev = netdev_priv(ndev);
	59
	60	netif_stop_queue(ndev);
	61	netif_carrier_off(ndev);
	62	cancel_delayed_work_sync(&mhi_netdev->rx_refill);
	63
	64	return 0;
65	}
66
67	static int mhi_ndo_xmit(struct sk_buff skb, struct net_device ndev)
68	{
69	struct mhi_net_dev *mhi_netdev = netdev_priv(ndev);
70	struct mhi_device *mdev = mhi_netdev->mdev;
71	int err;
72
73	err = mhi_queue_skb(mdev, DMA_TO_DEVICE, skb, skb->len, MHI_EOT);
74	if (unlikely(err)) {
75	net_err_ratelimited("%s: Failed to queue TX buf (%d)\n",
76	ndev->name, err);
77
78	u64_stats_update_begin(&mhi_netdev->stats.tx_syncp);
79	u64_stats_inc(&mhi_netdev->stats.tx_dropped);
80	u64_stats_update_end(&mhi_netdev->stats.tx_syncp);
81
82	/* drop the packet */
83	dev_kfree_skb_any(skb);
84	}
85
86	if (mhi_queue_is_full(mdev, DMA_TO_DEVICE))
87	netif_stop_queue(ndev);
88
89	return NETDEV_TX_OK;
90	}
91
92	static void mhi_ndo_get_stats64(struct net_device *ndev,
93	struct rtnl_link_stats64 *stats)
94	{
95	struct mhi_net_dev *mhi_netdev = netdev_priv(ndev);
96	unsigned int start;
97
98	do {
99	start = u64_stats_fetch_begin_irq(&mhi_netdev->stats.rx_syncp);
100	stats->rx_packets = u64_stats_read(&mhi_netdev->stats.rx_packets);
101	stats->rx_bytes = u64_stats_read(&mhi_netdev->stats.rx_bytes);
102	stats->rx_errors = u64_stats_read(&mhi_netdev->stats.rx_errors);
103	stats->rx_dropped = u64_stats_read(&mhi_netdev->stats.rx_dropped);
104	} while (u64_stats_fetch_retry_irq(&mhi_netdev->stats.rx_syncp, start));
105
106	do {
107	start = u64_stats_fetch_begin_irq(&mhi_netdev->stats.tx_syncp);
108	stats->tx_packets = u64_stats_read(&mhi_netdev->stats.tx_packets);
109	stats->tx_bytes = u64_stats_read(&mhi_netdev->stats.tx_bytes);
110	stats->tx_errors = u64_stats_read(&mhi_netdev->stats.tx_errors);
111	stats->tx_dropped = u64_stats_read(&mhi_netdev->stats.tx_dropped);
112	} while (u64_stats_fetch_retry_irq(&mhi_netdev->stats.tx_syncp, start));
113	}
114
115	static const struct net_device_ops mhi_netdev_ops = {
116	.ndo_open = mhi_ndo_open,
117	.ndo_stop = mhi_ndo_stop,
118	.ndo_start_xmit = mhi_ndo_xmit,
119	.ndo_get_stats64 = mhi_ndo_get_stats64,
120	};
121
122	static void mhi_net_setup(struct net_device *ndev)
123	{
124	ndev->header_ops = NULL; /* No header */
125	ndev->type = ARPHRD_NONE; /* QMAP... */
126	ndev->hard_header_len = 0;
127	ndev->addr_len = 0;
128	ndev->flags = IFF_POINTOPOINT \| IFF_NOARP;
129	ndev->netdev_ops = &mhi_netdev_ops;
130	ndev->mtu = MHI_NET_DEFAULT_MTU;
131	ndev->min_mtu = MHI_NET_MIN_MTU;
132	ndev->max_mtu = MHI_NET_MAX_MTU;
133	ndev->tx_queue_len = 1000;
134	}
135
136	static void mhi_net_dl_callback(struct mhi_device *mhi_dev,
137	struct mhi_result *mhi_res)
138	{
139	struct mhi_net_dev *mhi_netdev = dev_get_drvdata(&mhi_dev->dev);
140	struct sk_buff *skb = mhi_res->buf_addr;
141	int remaining;
142
143	remaining = atomic_dec_return(&mhi_netdev->stats.rx_queued);
144
145	if (unlikely(mhi_res->transaction_status)) {
146	dev_kfree_skb_any(skb);
147
148	/* MHI layer stopping/resetting the DL channel */
149	if (mhi_res->transaction_status == -ENOTCONN)
150	return;
151
152	u64_stats_update_begin(&mhi_netdev->stats.rx_syncp);
153	u64_stats_inc(&mhi_netdev->stats.rx_errors);
154	u64_stats_update_end(&mhi_netdev->stats.rx_syncp);
155	} else {
156	u64_stats_update_begin(&mhi_netdev->stats.rx_syncp);
157	u64_stats_inc(&mhi_netdev->stats.rx_packets);
158	u64_stats_add(&mhi_netdev->stats.rx_bytes, mhi_res->bytes_xferd);
159	u64_stats_update_end(&mhi_netdev->stats.rx_syncp);
160
161	skb->protocol = htons(ETH_P_MAP);
162	skb_put(skb, mhi_res->bytes_xferd);
163	netif_rx(skb);
164	}
165
166	/* Refill if RX buffers queue becomes low */
167	if (remaining <= mhi_netdev->rx_queue_sz / 2)
168	schedule_delayed_work(&mhi_netdev->rx_refill, 0);
169	}
170
171	static void mhi_net_ul_callback(struct mhi_device *mhi_dev,
172	struct mhi_result *mhi_res)
173	{
174	struct mhi_net_dev *mhi_netdev = dev_get_drvdata(&mhi_dev->dev);
175	struct net_device *ndev = mhi_netdev->ndev;
efc36d3c	176	struct mhi_device *mdev = mhi_netdev->mdev;
3ffec6a1 LP	177	struct sk_buff *skb = mhi_res->buf_addr;
	178
	179	/* Hardware has consumed the buffer, so free the skb (which is not
	180	* freed by the MHI stack) and perform accounting.
	181	*/
	182	dev_consume_skb_any(skb);
	183
	184	u64_stats_update_begin(&mhi_netdev->stats.tx_syncp);
	185	if (unlikely(mhi_res->transaction_status)) {
	186
	187	/* MHI layer stopping/resetting the UL channel */
	188	if (mhi_res->transaction_status == -ENOTCONN) {
	189	u64_stats_update_end(&mhi_netdev->stats.tx_syncp);
	190	return;
	191	}
	192
	193	u64_stats_inc(&mhi_netdev->stats.tx_errors);
	194	} else {
	195	u64_stats_inc(&mhi_netdev->stats.tx_packets);
	196	u64_stats_add(&mhi_netdev->stats.tx_bytes, mhi_res->bytes_xferd);
	197	}
	198	u64_stats_update_end(&mhi_netdev->stats.tx_syncp);
	199
efc36d3c	200	if (netif_queue_stopped(ndev) && !mhi_queue_is_full(mdev, DMA_TO_DEVICE))
3ffec6a1 LP	201	netif_wake_queue(ndev);
	202	}
	203
	204	static void mhi_net_rx_refill_work(struct work_struct *work)
	205	{
	206	struct mhi_net_dev *mhi_netdev = container_of(work, struct mhi_net_dev,
	207	rx_refill.work);
	208	struct net_device *ndev = mhi_netdev->ndev;
	209	struct mhi_device *mdev = mhi_netdev->mdev;
	210	int size = READ_ONCE(ndev->mtu);
	211	struct sk_buff *skb;
	212	int err;
	213
	214	while (atomic_read(&mhi_netdev->stats.rx_queued) < mhi_netdev->rx_queue_sz) {
	215	skb = netdev_alloc_skb(ndev, size);
	216	if (unlikely(!skb))
	217	break;
	218
	219	err = mhi_queue_skb(mdev, DMA_FROM_DEVICE, skb, size, MHI_EOT);
	220	if (unlikely(err)) {
	221	net_err_ratelimited("%s: Failed to queue RX buf (%d)\n",
	222	ndev->name, err);
	223	kfree_skb(skb);
	224	break;
	225	}
	226
	227	atomic_inc(&mhi_netdev->stats.rx_queued);
	228
	229	/* Do not hog the CPU if rx buffers are consumed faster than
	230	* queued (unlikely).
	231	*/
	232	cond_resched();
	233	}
	234
	235	/* If we're still starved of rx buffers, reschedule later */
	236	if (unlikely(!atomic_read(&mhi_netdev->stats.rx_queued)))
	237	schedule_delayed_work(&mhi_netdev->rx_refill, HZ / 2);
	238	}
	239
	240	static int mhi_net_probe(struct mhi_device *mhi_dev,
	241	const struct mhi_device_id *id)
	242	{
	243	const char netname = (char )id->driver_data;
	244	struct device *dev = &mhi_dev->dev;
	245	struct mhi_net_dev *mhi_netdev;
	246	struct net_device *ndev;
	247	int err;
	248
	249	ndev = alloc_netdev(sizeof(*mhi_netdev), netname, NET_NAME_PREDICTABLE,
	250	mhi_net_setup);
	251	if (!ndev)
	252	return -ENOMEM;
	253
	254	mhi_netdev = netdev_priv(ndev);
	255	dev_set_drvdata(dev, mhi_netdev);
	256	mhi_netdev->ndev = ndev;
	257	mhi_netdev->mdev = mhi_dev;
	258	SET_NETDEV_DEV(ndev, &mhi_dev->dev);
	259
	260	/* All MHI net channels have 128 ring elements (at least for now) */
	261	mhi_netdev->rx_queue_sz = 128;
	262
	263	INIT_DELAYED_WORK(&mhi_netdev->rx_refill, mhi_net_rx_refill_work);
	264	u64_stats_init(&mhi_netdev->stats.rx_syncp);
265	u64_stats_init(&mhi_netdev->stats.tx_syncp);
266
267	/* Start MHI channels */
268	err = mhi_prepare_for_transfer(mhi_dev);
269	if (err)
270	goto out_err;
271
272	err = register_netdev(ndev);
273	if (err)
274	goto out_err;
275
276	return 0;
277
278	out_err:
279	free_netdev(ndev);
280	return err;
281	}
282
283	static void mhi_net_remove(struct mhi_device *mhi_dev)
284	{
285	struct mhi_net_dev *mhi_netdev = dev_get_drvdata(&mhi_dev->dev);
286
287	unregister_netdev(mhi_netdev->ndev);
288
289	mhi_unprepare_from_transfer(mhi_netdev->mdev);
290
291	free_netdev(mhi_netdev->ndev);
292	}
293
294	static const struct mhi_device_id mhi_net_id_table[] = {
295	{ .chan = "IP_HW0", .driver_data = (kernel_ulong_t)"mhi_hwip%d" },
296	{ .chan = "IP_SW0", .driver_data = (kernel_ulong_t)"mhi_swip%d" },
297	{}
298	};
299	MODULE_DEVICE_TABLE(mhi, mhi_net_id_table);
300
301	static struct mhi_driver mhi_net_driver = {
302	.probe = mhi_net_probe,
303	.remove = mhi_net_remove,
304	.dl_xfer_cb = mhi_net_dl_callback,
305	.ul_xfer_cb = mhi_net_ul_callback,
306	.id_table = mhi_net_id_table,
307	.driver = {
308	.name = "mhi_net",
309	.owner = THIS_MODULE,
310	},
311	};
312
313	module_mhi_driver(mhi_net_driver);
314
315	MODULE_AUTHOR("Loic Poulain <loic.poulain@linaro.org>");
316	MODULE_DESCRIPTION("Network over MHI");
317	MODULE_LICENSE("GPL v2");