cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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rtl8150.c (22736B)


      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 *  Copyright (c) 2002 Petko Manolov (petkan@users.sourceforge.net)
      4 */
      5
      6#include <linux/signal.h>
      7#include <linux/slab.h>
      8#include <linux/module.h>
      9#include <linux/netdevice.h>
     10#include <linux/etherdevice.h>
     11#include <linux/mii.h>
     12#include <linux/ethtool.h>
     13#include <linux/usb.h>
     14#include <linux/uaccess.h>
     15
     16/* Version Information */
     17#define DRIVER_VERSION "v0.6.2 (2004/08/27)"
     18#define DRIVER_AUTHOR "Petko Manolov <petkan@users.sourceforge.net>"
     19#define DRIVER_DESC "rtl8150 based usb-ethernet driver"
     20
     21#define	IDR			0x0120
     22#define	MAR			0x0126
     23#define	CR			0x012e
     24#define	TCR			0x012f
     25#define	RCR			0x0130
     26#define	TSR			0x0132
     27#define	RSR			0x0133
     28#define	CON0			0x0135
     29#define	CON1			0x0136
     30#define	MSR			0x0137
     31#define	PHYADD			0x0138
     32#define	PHYDAT			0x0139
     33#define	PHYCNT			0x013b
     34#define	GPPC			0x013d
     35#define	BMCR			0x0140
     36#define	BMSR			0x0142
     37#define	ANAR			0x0144
     38#define	ANLP			0x0146
     39#define	AER			0x0148
     40#define CSCR			0x014C  /* This one has the link status */
     41#define CSCR_LINK_STATUS	(1 << 3)
     42
     43#define	IDR_EEPROM		0x1202
     44
     45#define	PHY_READ		0
     46#define	PHY_WRITE		0x20
     47#define	PHY_GO			0x40
     48
     49#define	MII_TIMEOUT		10
     50#define	INTBUFSIZE		8
     51
     52#define	RTL8150_REQT_READ	0xc0
     53#define	RTL8150_REQT_WRITE	0x40
     54#define	RTL8150_REQ_GET_REGS	0x05
     55#define	RTL8150_REQ_SET_REGS	0x05
     56
     57
     58/* Transmit status register errors */
     59#define TSR_ECOL		(1<<5)
     60#define TSR_LCOL		(1<<4)
     61#define TSR_LOSS_CRS		(1<<3)
     62#define TSR_JBR			(1<<2)
     63#define TSR_ERRORS		(TSR_ECOL | TSR_LCOL | TSR_LOSS_CRS | TSR_JBR)
     64/* Receive status register errors */
     65#define RSR_CRC			(1<<2)
     66#define RSR_FAE			(1<<1)
     67#define RSR_ERRORS		(RSR_CRC | RSR_FAE)
     68
     69/* Media status register definitions */
     70#define MSR_DUPLEX		(1<<4)
     71#define MSR_SPEED		(1<<3)
     72#define MSR_LINK		(1<<2)
     73
     74/* Interrupt pipe data */
     75#define INT_TSR			0x00
     76#define INT_RSR			0x01
     77#define INT_MSR			0x02
     78#define INT_WAKSR		0x03
     79#define INT_TXOK_CNT		0x04
     80#define INT_RXLOST_CNT		0x05
     81#define INT_CRERR_CNT		0x06
     82#define INT_COL_CNT		0x07
     83
     84
     85#define	RTL8150_MTU		1540
     86#define	RTL8150_TX_TIMEOUT	(HZ)
     87#define	RX_SKB_POOL_SIZE	4
     88
     89/* rtl8150 flags */
     90#define	RTL8150_HW_CRC		0
     91#define	RX_REG_SET		1
     92#define	RTL8150_UNPLUG		2
     93#define	RX_URB_FAIL		3
     94
     95/* Define these values to match your device */
     96#define	VENDOR_ID_REALTEK		0x0bda
     97#define	VENDOR_ID_MELCO			0x0411
     98#define	VENDOR_ID_MICRONET		0x3980
     99#define	VENDOR_ID_LONGSHINE		0x07b8
    100#define	VENDOR_ID_OQO			0x1557
    101#define	VENDOR_ID_ZYXEL			0x0586
    102
    103#define PRODUCT_ID_RTL8150		0x8150
    104#define	PRODUCT_ID_LUAKTX		0x0012
    105#define	PRODUCT_ID_LCS8138TX		0x401a
    106#define PRODUCT_ID_SP128AR		0x0003
    107#define	PRODUCT_ID_PRESTIGE		0x401a
    108
    109#undef	EEPROM_WRITE
    110
    111/* table of devices that work with this driver */
    112static const struct usb_device_id rtl8150_table[] = {
    113	{USB_DEVICE(VENDOR_ID_REALTEK, PRODUCT_ID_RTL8150)},
    114	{USB_DEVICE(VENDOR_ID_MELCO, PRODUCT_ID_LUAKTX)},
    115	{USB_DEVICE(VENDOR_ID_MICRONET, PRODUCT_ID_SP128AR)},
    116	{USB_DEVICE(VENDOR_ID_LONGSHINE, PRODUCT_ID_LCS8138TX)},
    117	{USB_DEVICE(VENDOR_ID_OQO, PRODUCT_ID_RTL8150)},
    118	{USB_DEVICE(VENDOR_ID_ZYXEL, PRODUCT_ID_PRESTIGE)},
    119	{}
    120};
    121
    122MODULE_DEVICE_TABLE(usb, rtl8150_table);
    123
    124struct rtl8150 {
    125	unsigned long flags;
    126	struct usb_device *udev;
    127	struct tasklet_struct tl;
    128	struct net_device *netdev;
    129	struct urb *rx_urb, *tx_urb, *intr_urb;
    130	struct sk_buff *tx_skb, *rx_skb;
    131	struct sk_buff *rx_skb_pool[RX_SKB_POOL_SIZE];
    132	spinlock_t rx_pool_lock;
    133	struct usb_ctrlrequest dr;
    134	int intr_interval;
    135	u8 *intr_buff;
    136	u8 phy;
    137};
    138
    139typedef struct rtl8150 rtl8150_t;
    140
    141struct async_req {
    142	struct usb_ctrlrequest dr;
    143	u16 rx_creg;
    144};
    145
    146static const char driver_name [] = "rtl8150";
    147
    148/*
    149**
    150**	device related part of the code
    151**
    152*/
    153static int get_registers(rtl8150_t * dev, u16 indx, u16 size, void *data)
    154{
    155	return usb_control_msg_recv(dev->udev, 0, RTL8150_REQ_GET_REGS,
    156				    RTL8150_REQT_READ, indx, 0, data, size,
    157				    1000, GFP_NOIO);
    158}
    159
    160static int set_registers(rtl8150_t * dev, u16 indx, u16 size, const void *data)
    161{
    162	return usb_control_msg_send(dev->udev, 0, RTL8150_REQ_SET_REGS,
    163				    RTL8150_REQT_WRITE, indx, 0, data, size,
    164				    1000, GFP_NOIO);
    165}
    166
    167static void async_set_reg_cb(struct urb *urb)
    168{
    169	struct async_req *req = (struct async_req *)urb->context;
    170	int status = urb->status;
    171
    172	if (status < 0)
    173		dev_dbg(&urb->dev->dev, "%s failed with %d", __func__, status);
    174	kfree(req);
    175	usb_free_urb(urb);
    176}
    177
    178static int async_set_registers(rtl8150_t *dev, u16 indx, u16 size, u16 reg)
    179{
    180	int res = -ENOMEM;
    181	struct urb *async_urb;
    182	struct async_req *req;
    183
    184	req = kmalloc(sizeof(struct async_req), GFP_ATOMIC);
    185	if (req == NULL)
    186		return res;
    187	async_urb = usb_alloc_urb(0, GFP_ATOMIC);
    188	if (async_urb == NULL) {
    189		kfree(req);
    190		return res;
    191	}
    192	req->rx_creg = cpu_to_le16(reg);
    193	req->dr.bRequestType = RTL8150_REQT_WRITE;
    194	req->dr.bRequest = RTL8150_REQ_SET_REGS;
    195	req->dr.wIndex = 0;
    196	req->dr.wValue = cpu_to_le16(indx);
    197	req->dr.wLength = cpu_to_le16(size);
    198	usb_fill_control_urb(async_urb, dev->udev,
    199	                     usb_sndctrlpipe(dev->udev, 0), (void *)&req->dr,
    200			     &req->rx_creg, size, async_set_reg_cb, req);
    201	res = usb_submit_urb(async_urb, GFP_ATOMIC);
    202	if (res) {
    203		if (res == -ENODEV)
    204			netif_device_detach(dev->netdev);
    205		dev_err(&dev->udev->dev, "%s failed with %d\n", __func__, res);
    206	}
    207	return res;
    208}
    209
    210static int read_mii_word(rtl8150_t * dev, u8 phy, __u8 indx, u16 * reg)
    211{
    212	int i;
    213	u8 data[3], tmp;
    214
    215	data[0] = phy;
    216	data[1] = data[2] = 0;
    217	tmp = indx | PHY_READ | PHY_GO;
    218	i = 0;
    219
    220	set_registers(dev, PHYADD, sizeof(data), data);
    221	set_registers(dev, PHYCNT, 1, &tmp);
    222	do {
    223		get_registers(dev, PHYCNT, 1, data);
    224	} while ((data[0] & PHY_GO) && (i++ < MII_TIMEOUT));
    225
    226	if (i <= MII_TIMEOUT) {
    227		get_registers(dev, PHYDAT, 2, data);
    228		*reg = data[0] | (data[1] << 8);
    229		return 0;
    230	} else
    231		return 1;
    232}
    233
    234static int write_mii_word(rtl8150_t * dev, u8 phy, __u8 indx, u16 reg)
    235{
    236	int i;
    237	u8 data[3], tmp;
    238
    239	data[0] = phy;
    240	data[1] = reg & 0xff;
    241	data[2] = (reg >> 8) & 0xff;
    242	tmp = indx | PHY_WRITE | PHY_GO;
    243	i = 0;
    244
    245	set_registers(dev, PHYADD, sizeof(data), data);
    246	set_registers(dev, PHYCNT, 1, &tmp);
    247	do {
    248		get_registers(dev, PHYCNT, 1, data);
    249	} while ((data[0] & PHY_GO) && (i++ < MII_TIMEOUT));
    250
    251	if (i <= MII_TIMEOUT)
    252		return 0;
    253	else
    254		return 1;
    255}
    256
    257static void set_ethernet_addr(rtl8150_t *dev)
    258{
    259	u8 node_id[ETH_ALEN];
    260	int ret;
    261
    262	ret = get_registers(dev, IDR, sizeof(node_id), node_id);
    263
    264	if (!ret) {
    265		eth_hw_addr_set(dev->netdev, node_id);
    266	} else {
    267		eth_hw_addr_random(dev->netdev);
    268		netdev_notice(dev->netdev, "Assigned a random MAC address: %pM\n",
    269			      dev->netdev->dev_addr);
    270	}
    271}
    272
    273static int rtl8150_set_mac_address(struct net_device *netdev, void *p)
    274{
    275	struct sockaddr *addr = p;
    276	rtl8150_t *dev = netdev_priv(netdev);
    277
    278	if (netif_running(netdev))
    279		return -EBUSY;
    280
    281	eth_hw_addr_set(netdev, addr->sa_data);
    282	netdev_dbg(netdev, "Setting MAC address to %pM\n", netdev->dev_addr);
    283	/* Set the IDR registers. */
    284	set_registers(dev, IDR, netdev->addr_len, netdev->dev_addr);
    285#ifdef EEPROM_WRITE
    286	{
    287	int i;
    288	u8 cr;
    289	/* Get the CR contents. */
    290	get_registers(dev, CR, 1, &cr);
    291	/* Set the WEPROM bit (eeprom write enable). */
    292	cr |= 0x20;
    293	set_registers(dev, CR, 1, &cr);
    294	/* Write the MAC address into eeprom. Eeprom writes must be word-sized,
    295	   so we need to split them up. */
    296	for (i = 0; i * 2 < netdev->addr_len; i++) {
    297		set_registers(dev, IDR_EEPROM + (i * 2), 2,
    298		netdev->dev_addr + (i * 2));
    299	}
    300	/* Clear the WEPROM bit (preventing accidental eeprom writes). */
    301	cr &= 0xdf;
    302	set_registers(dev, CR, 1, &cr);
    303	}
    304#endif
    305	return 0;
    306}
    307
    308static int rtl8150_reset(rtl8150_t * dev)
    309{
    310	u8 data = 0x10;
    311	int i = HZ;
    312
    313	set_registers(dev, CR, 1, &data);
    314	do {
    315		get_registers(dev, CR, 1, &data);
    316	} while ((data & 0x10) && --i);
    317
    318	return (i > 0) ? 1 : 0;
    319}
    320
    321static int alloc_all_urbs(rtl8150_t * dev)
    322{
    323	dev->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
    324	if (!dev->rx_urb)
    325		return 0;
    326	dev->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
    327	if (!dev->tx_urb) {
    328		usb_free_urb(dev->rx_urb);
    329		return 0;
    330	}
    331	dev->intr_urb = usb_alloc_urb(0, GFP_KERNEL);
    332	if (!dev->intr_urb) {
    333		usb_free_urb(dev->rx_urb);
    334		usb_free_urb(dev->tx_urb);
    335		return 0;
    336	}
    337
    338	return 1;
    339}
    340
    341static void free_all_urbs(rtl8150_t * dev)
    342{
    343	usb_free_urb(dev->rx_urb);
    344	usb_free_urb(dev->tx_urb);
    345	usb_free_urb(dev->intr_urb);
    346}
    347
    348static void unlink_all_urbs(rtl8150_t * dev)
    349{
    350	usb_kill_urb(dev->rx_urb);
    351	usb_kill_urb(dev->tx_urb);
    352	usb_kill_urb(dev->intr_urb);
    353}
    354
    355static inline struct sk_buff *pull_skb(rtl8150_t *dev)
    356{
    357	struct sk_buff *skb;
    358	int i;
    359
    360	for (i = 0; i < RX_SKB_POOL_SIZE; i++) {
    361		if (dev->rx_skb_pool[i]) {
    362			skb = dev->rx_skb_pool[i];
    363			dev->rx_skb_pool[i] = NULL;
    364			return skb;
    365		}
    366	}
    367	return NULL;
    368}
    369
    370static void read_bulk_callback(struct urb *urb)
    371{
    372	rtl8150_t *dev;
    373	unsigned pkt_len, res;
    374	struct sk_buff *skb;
    375	struct net_device *netdev;
    376	int status = urb->status;
    377	int result;
    378	unsigned long flags;
    379
    380	dev = urb->context;
    381	if (!dev)
    382		return;
    383	if (test_bit(RTL8150_UNPLUG, &dev->flags))
    384		return;
    385	netdev = dev->netdev;
    386	if (!netif_device_present(netdev))
    387		return;
    388
    389	switch (status) {
    390	case 0:
    391		break;
    392	case -ENOENT:
    393		return;	/* the urb is in unlink state */
    394	case -ETIME:
    395		if (printk_ratelimit())
    396			dev_warn(&urb->dev->dev, "may be reset is needed?..\n");
    397		goto goon;
    398	default:
    399		if (printk_ratelimit())
    400			dev_warn(&urb->dev->dev, "Rx status %d\n", status);
    401		goto goon;
    402	}
    403
    404	if (!dev->rx_skb)
    405		goto resched;
    406	/* protect against short packets (tell me why we got some?!?) */
    407	if (urb->actual_length < 4)
    408		goto goon;
    409
    410	res = urb->actual_length;
    411	pkt_len = res - 4;
    412
    413	skb_put(dev->rx_skb, pkt_len);
    414	dev->rx_skb->protocol = eth_type_trans(dev->rx_skb, netdev);
    415	netif_rx(dev->rx_skb);
    416	netdev->stats.rx_packets++;
    417	netdev->stats.rx_bytes += pkt_len;
    418
    419	spin_lock_irqsave(&dev->rx_pool_lock, flags);
    420	skb = pull_skb(dev);
    421	spin_unlock_irqrestore(&dev->rx_pool_lock, flags);
    422	if (!skb)
    423		goto resched;
    424
    425	dev->rx_skb = skb;
    426goon:
    427	usb_fill_bulk_urb(dev->rx_urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1),
    428		      dev->rx_skb->data, RTL8150_MTU, read_bulk_callback, dev);
    429	result = usb_submit_urb(dev->rx_urb, GFP_ATOMIC);
    430	if (result == -ENODEV)
    431		netif_device_detach(dev->netdev);
    432	else if (result) {
    433		set_bit(RX_URB_FAIL, &dev->flags);
    434		goto resched;
    435	} else {
    436		clear_bit(RX_URB_FAIL, &dev->flags);
    437	}
    438
    439	return;
    440resched:
    441	tasklet_schedule(&dev->tl);
    442}
    443
    444static void write_bulk_callback(struct urb *urb)
    445{
    446	rtl8150_t *dev;
    447	int status = urb->status;
    448
    449	dev = urb->context;
    450	if (!dev)
    451		return;
    452	dev_kfree_skb_irq(dev->tx_skb);
    453	if (!netif_device_present(dev->netdev))
    454		return;
    455	if (status)
    456		dev_info(&urb->dev->dev, "%s: Tx status %d\n",
    457			 dev->netdev->name, status);
    458	netif_trans_update(dev->netdev);
    459	netif_wake_queue(dev->netdev);
    460}
    461
    462static void intr_callback(struct urb *urb)
    463{
    464	rtl8150_t *dev;
    465	__u8 *d;
    466	int status = urb->status;
    467	int res;
    468
    469	dev = urb->context;
    470	if (!dev)
    471		return;
    472	switch (status) {
    473	case 0:			/* success */
    474		break;
    475	case -ECONNRESET:	/* unlink */
    476	case -ENOENT:
    477	case -ESHUTDOWN:
    478		return;
    479	/* -EPIPE:  should clear the halt */
    480	default:
    481		dev_info(&urb->dev->dev, "%s: intr status %d\n",
    482			 dev->netdev->name, status);
    483		goto resubmit;
    484	}
    485
    486	d = urb->transfer_buffer;
    487	if (d[0] & TSR_ERRORS) {
    488		dev->netdev->stats.tx_errors++;
    489		if (d[INT_TSR] & (TSR_ECOL | TSR_JBR))
    490			dev->netdev->stats.tx_aborted_errors++;
    491		if (d[INT_TSR] & TSR_LCOL)
    492			dev->netdev->stats.tx_window_errors++;
    493		if (d[INT_TSR] & TSR_LOSS_CRS)
    494			dev->netdev->stats.tx_carrier_errors++;
    495	}
    496	/* Report link status changes to the network stack */
    497	if ((d[INT_MSR] & MSR_LINK) == 0) {
    498		if (netif_carrier_ok(dev->netdev)) {
    499			netif_carrier_off(dev->netdev);
    500			netdev_dbg(dev->netdev, "%s: LINK LOST\n", __func__);
    501		}
    502	} else {
    503		if (!netif_carrier_ok(dev->netdev)) {
    504			netif_carrier_on(dev->netdev);
    505			netdev_dbg(dev->netdev, "%s: LINK CAME BACK\n", __func__);
    506		}
    507	}
    508
    509resubmit:
    510	res = usb_submit_urb (urb, GFP_ATOMIC);
    511	if (res == -ENODEV)
    512		netif_device_detach(dev->netdev);
    513	else if (res)
    514		dev_err(&dev->udev->dev,
    515			"can't resubmit intr, %s-%s/input0, status %d\n",
    516			dev->udev->bus->bus_name, dev->udev->devpath, res);
    517}
    518
    519static int rtl8150_suspend(struct usb_interface *intf, pm_message_t message)
    520{
    521	rtl8150_t *dev = usb_get_intfdata(intf);
    522
    523	netif_device_detach(dev->netdev);
    524
    525	if (netif_running(dev->netdev)) {
    526		usb_kill_urb(dev->rx_urb);
    527		usb_kill_urb(dev->intr_urb);
    528	}
    529	return 0;
    530}
    531
    532static int rtl8150_resume(struct usb_interface *intf)
    533{
    534	rtl8150_t *dev = usb_get_intfdata(intf);
    535
    536	netif_device_attach(dev->netdev);
    537	if (netif_running(dev->netdev)) {
    538		dev->rx_urb->status = 0;
    539		dev->rx_urb->actual_length = 0;
    540		read_bulk_callback(dev->rx_urb);
    541
    542		dev->intr_urb->status = 0;
    543		dev->intr_urb->actual_length = 0;
    544		intr_callback(dev->intr_urb);
    545	}
    546	return 0;
    547}
    548
    549/*
    550**
    551**	network related part of the code
    552**
    553*/
    554
    555static void fill_skb_pool(rtl8150_t *dev)
    556{
    557	struct sk_buff *skb;
    558	int i;
    559
    560	for (i = 0; i < RX_SKB_POOL_SIZE; i++) {
    561		if (dev->rx_skb_pool[i])
    562			continue;
    563		skb = dev_alloc_skb(RTL8150_MTU + 2);
    564		if (!skb) {
    565			return;
    566		}
    567		skb_reserve(skb, 2);
    568		dev->rx_skb_pool[i] = skb;
    569	}
    570}
    571
    572static void free_skb_pool(rtl8150_t *dev)
    573{
    574	int i;
    575
    576	for (i = 0; i < RX_SKB_POOL_SIZE; i++)
    577		dev_kfree_skb(dev->rx_skb_pool[i]);
    578}
    579
    580static void rx_fixup(struct tasklet_struct *t)
    581{
    582	struct rtl8150 *dev = from_tasklet(dev, t, tl);
    583	struct sk_buff *skb;
    584	int status;
    585
    586	spin_lock_irq(&dev->rx_pool_lock);
    587	fill_skb_pool(dev);
    588	spin_unlock_irq(&dev->rx_pool_lock);
    589	if (test_bit(RX_URB_FAIL, &dev->flags))
    590		if (dev->rx_skb)
    591			goto try_again;
    592	spin_lock_irq(&dev->rx_pool_lock);
    593	skb = pull_skb(dev);
    594	spin_unlock_irq(&dev->rx_pool_lock);
    595	if (skb == NULL)
    596		goto tlsched;
    597	dev->rx_skb = skb;
    598	usb_fill_bulk_urb(dev->rx_urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1),
    599		      dev->rx_skb->data, RTL8150_MTU, read_bulk_callback, dev);
    600try_again:
    601	status = usb_submit_urb(dev->rx_urb, GFP_ATOMIC);
    602	if (status == -ENODEV) {
    603		netif_device_detach(dev->netdev);
    604	} else if (status) {
    605		set_bit(RX_URB_FAIL, &dev->flags);
    606		goto tlsched;
    607	} else {
    608		clear_bit(RX_URB_FAIL, &dev->flags);
    609	}
    610
    611	return;
    612tlsched:
    613	tasklet_schedule(&dev->tl);
    614}
    615
    616static int enable_net_traffic(rtl8150_t * dev)
    617{
    618	u8 cr, tcr, rcr, msr;
    619
    620	if (!rtl8150_reset(dev)) {
    621		dev_warn(&dev->udev->dev, "device reset failed\n");
    622	}
    623	/* RCR bit7=1 attach Rx info at the end;  =0 HW CRC (which is broken) */
    624	rcr = 0x9e;
    625	tcr = 0xd8;
    626	cr = 0x0c;
    627	if (!(rcr & 0x80))
    628		set_bit(RTL8150_HW_CRC, &dev->flags);
    629	set_registers(dev, RCR, 1, &rcr);
    630	set_registers(dev, TCR, 1, &tcr);
    631	set_registers(dev, CR, 1, &cr);
    632	get_registers(dev, MSR, 1, &msr);
    633
    634	return 0;
    635}
    636
    637static void disable_net_traffic(rtl8150_t * dev)
    638{
    639	u8 cr;
    640
    641	get_registers(dev, CR, 1, &cr);
    642	cr &= 0xf3;
    643	set_registers(dev, CR, 1, &cr);
    644}
    645
    646static void rtl8150_tx_timeout(struct net_device *netdev, unsigned int txqueue)
    647{
    648	rtl8150_t *dev = netdev_priv(netdev);
    649	dev_warn(&netdev->dev, "Tx timeout.\n");
    650	usb_unlink_urb(dev->tx_urb);
    651	netdev->stats.tx_errors++;
    652}
    653
    654static void rtl8150_set_multicast(struct net_device *netdev)
    655{
    656	rtl8150_t *dev = netdev_priv(netdev);
    657	u16 rx_creg = 0x9e;
    658
    659	netif_stop_queue(netdev);
    660	if (netdev->flags & IFF_PROMISC) {
    661		rx_creg |= 0x0001;
    662		dev_info(&netdev->dev, "%s: promiscuous mode\n", netdev->name);
    663	} else if (!netdev_mc_empty(netdev) ||
    664		   (netdev->flags & IFF_ALLMULTI)) {
    665		rx_creg &= 0xfffe;
    666		rx_creg |= 0x0002;
    667		dev_dbg(&netdev->dev, "%s: allmulti set\n", netdev->name);
    668	} else {
    669		/* ~RX_MULTICAST, ~RX_PROMISCUOUS */
    670		rx_creg &= 0x00fc;
    671	}
    672	async_set_registers(dev, RCR, sizeof(rx_creg), rx_creg);
    673	netif_wake_queue(netdev);
    674}
    675
    676static netdev_tx_t rtl8150_start_xmit(struct sk_buff *skb,
    677					    struct net_device *netdev)
    678{
    679	rtl8150_t *dev = netdev_priv(netdev);
    680	int count, res;
    681
    682	netif_stop_queue(netdev);
    683	count = (skb->len < 60) ? 60 : skb->len;
    684	count = (count & 0x3f) ? count : count + 1;
    685	dev->tx_skb = skb;
    686	usb_fill_bulk_urb(dev->tx_urb, dev->udev, usb_sndbulkpipe(dev->udev, 2),
    687		      skb->data, count, write_bulk_callback, dev);
    688	if ((res = usb_submit_urb(dev->tx_urb, GFP_ATOMIC))) {
    689		/* Can we get/handle EPIPE here? */
    690		if (res == -ENODEV)
    691			netif_device_detach(dev->netdev);
    692		else {
    693			dev_warn(&netdev->dev, "failed tx_urb %d\n", res);
    694			netdev->stats.tx_errors++;
    695			netif_start_queue(netdev);
    696		}
    697	} else {
    698		netdev->stats.tx_packets++;
    699		netdev->stats.tx_bytes += skb->len;
    700		netif_trans_update(netdev);
    701	}
    702
    703	return NETDEV_TX_OK;
    704}
    705
    706
    707static void set_carrier(struct net_device *netdev)
    708{
    709	rtl8150_t *dev = netdev_priv(netdev);
    710	short tmp;
    711
    712	get_registers(dev, CSCR, 2, &tmp);
    713	if (tmp & CSCR_LINK_STATUS)
    714		netif_carrier_on(netdev);
    715	else
    716		netif_carrier_off(netdev);
    717}
    718
    719static int rtl8150_open(struct net_device *netdev)
    720{
    721	rtl8150_t *dev = netdev_priv(netdev);
    722	int res;
    723
    724	if (dev->rx_skb == NULL)
    725		dev->rx_skb = pull_skb(dev);
    726	if (!dev->rx_skb)
    727		return -ENOMEM;
    728
    729	set_registers(dev, IDR, 6, netdev->dev_addr);
    730
    731	usb_fill_bulk_urb(dev->rx_urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1),
    732		      dev->rx_skb->data, RTL8150_MTU, read_bulk_callback, dev);
    733	if ((res = usb_submit_urb(dev->rx_urb, GFP_KERNEL))) {
    734		if (res == -ENODEV)
    735			netif_device_detach(dev->netdev);
    736		dev_warn(&netdev->dev, "rx_urb submit failed: %d\n", res);
    737		return res;
    738	}
    739	usb_fill_int_urb(dev->intr_urb, dev->udev, usb_rcvintpipe(dev->udev, 3),
    740		     dev->intr_buff, INTBUFSIZE, intr_callback,
    741		     dev, dev->intr_interval);
    742	if ((res = usb_submit_urb(dev->intr_urb, GFP_KERNEL))) {
    743		if (res == -ENODEV)
    744			netif_device_detach(dev->netdev);
    745		dev_warn(&netdev->dev, "intr_urb submit failed: %d\n", res);
    746		usb_kill_urb(dev->rx_urb);
    747		return res;
    748	}
    749	enable_net_traffic(dev);
    750	set_carrier(netdev);
    751	netif_start_queue(netdev);
    752
    753	return res;
    754}
    755
    756static int rtl8150_close(struct net_device *netdev)
    757{
    758	rtl8150_t *dev = netdev_priv(netdev);
    759
    760	netif_stop_queue(netdev);
    761	if (!test_bit(RTL8150_UNPLUG, &dev->flags))
    762		disable_net_traffic(dev);
    763	unlink_all_urbs(dev);
    764
    765	return 0;
    766}
    767
    768static void rtl8150_get_drvinfo(struct net_device *netdev, struct ethtool_drvinfo *info)
    769{
    770	rtl8150_t *dev = netdev_priv(netdev);
    771
    772	strlcpy(info->driver, driver_name, sizeof(info->driver));
    773	strlcpy(info->version, DRIVER_VERSION, sizeof(info->version));
    774	usb_make_path(dev->udev, info->bus_info, sizeof(info->bus_info));
    775}
    776
    777static int rtl8150_get_link_ksettings(struct net_device *netdev,
    778				      struct ethtool_link_ksettings *ecmd)
    779{
    780	rtl8150_t *dev = netdev_priv(netdev);
    781	short lpa, bmcr;
    782	u32 supported;
    783
    784	supported = (SUPPORTED_10baseT_Half |
    785			  SUPPORTED_10baseT_Full |
    786			  SUPPORTED_100baseT_Half |
    787			  SUPPORTED_100baseT_Full |
    788			  SUPPORTED_Autoneg |
    789			  SUPPORTED_TP | SUPPORTED_MII);
    790	ecmd->base.port = PORT_TP;
    791	ecmd->base.phy_address = dev->phy;
    792	get_registers(dev, BMCR, 2, &bmcr);
    793	get_registers(dev, ANLP, 2, &lpa);
    794	if (bmcr & BMCR_ANENABLE) {
    795		u32 speed = ((lpa & (LPA_100HALF | LPA_100FULL)) ?
    796			     SPEED_100 : SPEED_10);
    797		ecmd->base.speed = speed;
    798		ecmd->base.autoneg = AUTONEG_ENABLE;
    799		if (speed == SPEED_100)
    800			ecmd->base.duplex = (lpa & LPA_100FULL) ?
    801			    DUPLEX_FULL : DUPLEX_HALF;
    802		else
    803			ecmd->base.duplex = (lpa & LPA_10FULL) ?
    804			    DUPLEX_FULL : DUPLEX_HALF;
    805	} else {
    806		ecmd->base.autoneg = AUTONEG_DISABLE;
    807		ecmd->base.speed = ((bmcr & BMCR_SPEED100) ?
    808					     SPEED_100 : SPEED_10);
    809		ecmd->base.duplex = (bmcr & BMCR_FULLDPLX) ?
    810		    DUPLEX_FULL : DUPLEX_HALF;
    811	}
    812
    813	ethtool_convert_legacy_u32_to_link_mode(ecmd->link_modes.supported,
    814						supported);
    815
    816	return 0;
    817}
    818
    819static const struct ethtool_ops ops = {
    820	.get_drvinfo = rtl8150_get_drvinfo,
    821	.get_link = ethtool_op_get_link,
    822	.get_link_ksettings = rtl8150_get_link_ksettings,
    823};
    824
    825static int rtl8150_siocdevprivate(struct net_device *netdev, struct ifreq *rq,
    826				  void __user *udata, int cmd)
    827{
    828	rtl8150_t *dev = netdev_priv(netdev);
    829	u16 *data = (u16 *) & rq->ifr_ifru;
    830	int res = 0;
    831
    832	switch (cmd) {
    833	case SIOCDEVPRIVATE:
    834		data[0] = dev->phy;
    835		fallthrough;
    836	case SIOCDEVPRIVATE + 1:
    837		read_mii_word(dev, dev->phy, (data[1] & 0x1f), &data[3]);
    838		break;
    839	case SIOCDEVPRIVATE + 2:
    840		if (!capable(CAP_NET_ADMIN))
    841			return -EPERM;
    842		write_mii_word(dev, dev->phy, (data[1] & 0x1f), data[2]);
    843		break;
    844	default:
    845		res = -EOPNOTSUPP;
    846	}
    847
    848	return res;
    849}
    850
    851static const struct net_device_ops rtl8150_netdev_ops = {
    852	.ndo_open		= rtl8150_open,
    853	.ndo_stop		= rtl8150_close,
    854	.ndo_siocdevprivate	= rtl8150_siocdevprivate,
    855	.ndo_start_xmit		= rtl8150_start_xmit,
    856	.ndo_tx_timeout		= rtl8150_tx_timeout,
    857	.ndo_set_rx_mode	= rtl8150_set_multicast,
    858	.ndo_set_mac_address	= rtl8150_set_mac_address,
    859
    860	.ndo_validate_addr	= eth_validate_addr,
    861};
    862
    863static int rtl8150_probe(struct usb_interface *intf,
    864			 const struct usb_device_id *id)
    865{
    866	struct usb_device *udev = interface_to_usbdev(intf);
    867	rtl8150_t *dev;
    868	struct net_device *netdev;
    869
    870	netdev = alloc_etherdev(sizeof(rtl8150_t));
    871	if (!netdev)
    872		return -ENOMEM;
    873
    874	dev = netdev_priv(netdev);
    875
    876	dev->intr_buff = kmalloc(INTBUFSIZE, GFP_KERNEL);
    877	if (!dev->intr_buff) {
    878		free_netdev(netdev);
    879		return -ENOMEM;
    880	}
    881
    882	tasklet_setup(&dev->tl, rx_fixup);
    883	spin_lock_init(&dev->rx_pool_lock);
    884
    885	dev->udev = udev;
    886	dev->netdev = netdev;
    887	netdev->netdev_ops = &rtl8150_netdev_ops;
    888	netdev->watchdog_timeo = RTL8150_TX_TIMEOUT;
    889	netdev->ethtool_ops = &ops;
    890	dev->intr_interval = 100;	/* 100ms */
    891
    892	if (!alloc_all_urbs(dev)) {
    893		dev_err(&intf->dev, "out of memory\n");
    894		goto out;
    895	}
    896	if (!rtl8150_reset(dev)) {
    897		dev_err(&intf->dev, "couldn't reset the device\n");
    898		goto out1;
    899	}
    900	fill_skb_pool(dev);
    901	set_ethernet_addr(dev);
    902
    903	usb_set_intfdata(intf, dev);
    904	SET_NETDEV_DEV(netdev, &intf->dev);
    905	if (register_netdev(netdev) != 0) {
    906		dev_err(&intf->dev, "couldn't register the device\n");
    907		goto out2;
    908	}
    909
    910	dev_info(&intf->dev, "%s: rtl8150 is detected\n", netdev->name);
    911
    912	return 0;
    913
    914out2:
    915	usb_set_intfdata(intf, NULL);
    916	free_skb_pool(dev);
    917out1:
    918	free_all_urbs(dev);
    919out:
    920	kfree(dev->intr_buff);
    921	free_netdev(netdev);
    922	return -EIO;
    923}
    924
    925static void rtl8150_disconnect(struct usb_interface *intf)
    926{
    927	rtl8150_t *dev = usb_get_intfdata(intf);
    928
    929	usb_set_intfdata(intf, NULL);
    930	if (dev) {
    931		set_bit(RTL8150_UNPLUG, &dev->flags);
    932		tasklet_kill(&dev->tl);
    933		unregister_netdev(dev->netdev);
    934		unlink_all_urbs(dev);
    935		free_all_urbs(dev);
    936		free_skb_pool(dev);
    937		dev_kfree_skb(dev->rx_skb);
    938		kfree(dev->intr_buff);
    939		free_netdev(dev->netdev);
    940	}
    941}
    942
    943static struct usb_driver rtl8150_driver = {
    944	.name		= driver_name,
    945	.probe		= rtl8150_probe,
    946	.disconnect	= rtl8150_disconnect,
    947	.id_table	= rtl8150_table,
    948	.suspend	= rtl8150_suspend,
    949	.resume		= rtl8150_resume,
    950	.disable_hub_initiated_lpm = 1,
    951};
    952
    953module_usb_driver(rtl8150_driver);
    954
    955MODULE_AUTHOR(DRIVER_AUTHOR);
    956MODULE_DESCRIPTION(DRIVER_DESC);
    957MODULE_LICENSE("GPL");