[J-u-boot.git] / net / eth_legacy.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2001-2015
 * Wolfgang Denk, DENX Software Engineering, [email protected].
 * Joe Hershberger, National Instruments
 */

#include <common.h>
#include <command.h>
#include <env.h>
#include <net.h>
#include <phy.h>
#include <linux/errno.h>
#include <net/pcap.h>
#include "eth_internal.h"

DECLARE_GLOBAL_DATA_PTR;

/*
 * CPU and board-specific Ethernet initializations.  Aliased function
 * signals caller to move on
 */
static int __def_eth_init(bd_t *bis)
{
	return -1;
}
int cpu_eth_init(bd_t *bis) __attribute__((weak, alias("__def_eth_init")));
int board_eth_init(bd_t *bis) __attribute__((weak, alias("__def_eth_init")));

#ifdef CONFIG_API
static struct {
	uchar data[PKTSIZE];
	int length;
} eth_rcv_bufs[PKTBUFSRX];

static unsigned int eth_rcv_current, eth_rcv_last;
#endif

static struct eth_device *eth_devices;
struct eth_device *eth_current;

void eth_set_current_to_next(void)
{
	eth_current = eth_current->next;
}

void eth_set_dev(struct eth_device *dev)
{
	eth_current = dev;
}

struct eth_device *eth_get_dev_by_name(const char *devname)
{
	struct eth_device *dev, *target_dev;

	BUG_ON(devname == NULL);

	if (!eth_devices)
		return NULL;

	dev = eth_devices;
	target_dev = NULL;
	do {
		if (strcmp(devname, dev->name) == 0) {
			target_dev = dev;
			break;
		}
		dev = dev->next;
	} while (dev != eth_devices);

	return target_dev;
}

struct eth_device *eth_get_dev_by_index(int index)
{
	struct eth_device *dev, *target_dev;

	if (!eth_devices)
		return NULL;

	dev = eth_devices;
	target_dev = NULL;
	do {
		if (dev->index == index) {
			target_dev = dev;
			break;
		}
		dev = dev->next;
	} while (dev != eth_devices);

	return target_dev;
}

int eth_get_dev_index(void)
{
	if (!eth_current)
		return -1;

	return eth_current->index;
}

static int on_ethaddr(const char *name, const char *value, enum env_op op,
	int flags)
{
	int index;
	struct eth_device *dev;

	if (!eth_devices)
		return 0;

	/* look for an index after "eth" */
	index = simple_strtoul(name + 3, NULL, 10);

	dev = eth_devices;
	do {
		if (dev->index == index) {
			switch (op) {
			case env_op_create:
			case env_op_overwrite:
				string_to_enetaddr(value, dev->enetaddr);
				eth_write_hwaddr(dev, "eth", dev->index);
				break;
			case env_op_delete:
				memset(dev->enetaddr, 0, ARP_HLEN);
			}
		}
		dev = dev->next;
	} while (dev != eth_devices);

	return 0;
}
U_BOOT_ENV_CALLBACK(ethaddr, on_ethaddr);

int eth_write_hwaddr(struct eth_device *dev, const char *base_name,
		   int eth_number)
{
	unsigned char env_enetaddr[ARP_HLEN];
	int ret = 0;

	eth_env_get_enetaddr_by_index(base_name, eth_number, env_enetaddr);

	if (!is_zero_ethaddr(env_enetaddr)) {
		if (!is_zero_ethaddr(dev->enetaddr) &&
		    memcmp(dev->enetaddr, env_enetaddr, ARP_HLEN)) {
			printf("\nWarning: %s MAC addresses don't match:\n",
			       dev->name);
			printf("Address in SROM is         %pM\n",
			       dev->enetaddr);
			printf("Address in environment is  %pM\n",
			       env_enetaddr);
		}

		memcpy(dev->enetaddr, env_enetaddr, ARP_HLEN);
	} else if (is_valid_ethaddr(dev->enetaddr)) {
		eth_env_set_enetaddr_by_index(base_name, eth_number,
					      dev->enetaddr);
	} else if (is_zero_ethaddr(dev->enetaddr)) {
#ifdef CONFIG_NET_RANDOM_ETHADDR
		net_random_ethaddr(dev->enetaddr);
		printf("\nWarning: %s (eth%d) using random MAC address - %pM\n",
		       dev->name, eth_number, dev->enetaddr);
#else
		printf("\nError: %s address not set.\n",
		       dev->name);
		return -EINVAL;
#endif
	}

	if (dev->write_hwaddr && !eth_mac_skip(eth_number)) {
		if (!is_valid_ethaddr(dev->enetaddr)) {
			printf("\nError: %s address %pM illegal value\n",
			       dev->name, dev->enetaddr);
			return -EINVAL;
		}

		ret = dev->write_hwaddr(dev);
		if (ret)
			printf("\nWarning: %s failed to set MAC address\n",
			       dev->name);
	}

	return ret;
}

int eth_register(struct eth_device *dev)
{
	struct eth_device *d;
	static int index;

	assert(strlen(dev->name) < sizeof(dev->name));

	if (!eth_devices) {
		eth_devices = dev;
		eth_current = dev;
		eth_current_changed();
	} else {
		for (d = eth_devices; d->next != eth_devices; d = d->next)
			;
		d->next = dev;
	}

	dev->state = ETH_STATE_INIT;
	dev->next  = eth_devices;
	dev->index = index++;

	return 0;
}

int eth_unregister(struct eth_device *dev)
{
	struct eth_device *cur;

	/* No device */
	if (!eth_devices)
		return -ENODEV;

	for (cur = eth_devices; cur->next != eth_devices && cur->next != dev;
	     cur = cur->next)
		;

	/* Device not found */
	if (cur->next != dev)
		return -ENODEV;

	cur->next = dev->next;

	if (eth_devices == dev)
		eth_devices = dev->next == eth_devices ? NULL : dev->next;

	if (eth_current == dev) {
		eth_current = eth_devices;
		eth_current_changed();
	}

	return 0;
}

int eth_initialize(void)
{
	int num_devices = 0;

	eth_devices = NULL;
	eth_current = NULL;
	eth_common_init();
	/*
	 * If board-specific initialization exists, call it.
	 * If not, call a CPU-specific one
	 */
	if (board_eth_init != __def_eth_init) {
		if (board_eth_init(gd->bd) < 0)
			printf("Board Net Initialization Failed\n");
	} else if (cpu_eth_init != __def_eth_init) {
		if (cpu_eth_init(gd->bd) < 0)
			printf("CPU Net Initialization Failed\n");
	} else {
		printf("Net Initialization Skipped\n");
	}

	if (!eth_devices) {
		puts("No ethernet found.\n");
		bootstage_error(BOOTSTAGE_ID_NET_ETH_START);
	} else {
		struct eth_device *dev = eth_devices;
		char *ethprime = env_get("ethprime");

		bootstage_mark(BOOTSTAGE_ID_NET_ETH_INIT);
		do {
			if (dev->index)
				puts(", ");

			printf("%s", dev->name);

			if (ethprime && strcmp(dev->name, ethprime) == 0) {
				eth_current = dev;
				puts(" [PRIME]");
			}

			if (strchr(dev->name, ' '))
				puts("\nWarning: eth device name has a space!"
					"\n");

			eth_write_hwaddr(dev, "eth", dev->index);

			dev = dev->next;
			num_devices++;
		} while (dev != eth_devices);

		eth_current_changed();
		putc('\n');
	}

	return num_devices;
}

/* Multicast.
 * mcast_addr: multicast ipaddr from which multicast Mac is made
 * join: 1=join, 0=leave.
 */
int eth_mcast_join(struct in_addr mcast_ip, int join)
{
	u8 mcast_mac[ARP_HLEN];
	if (!eth_current || !eth_current->mcast)
		return -1;
	mcast_mac[5] = htonl(mcast_ip.s_addr) & 0xff;
	mcast_mac[4] = (htonl(mcast_ip.s_addr)>>8) & 0xff;
	mcast_mac[3] = (htonl(mcast_ip.s_addr)>>16) & 0x7f;
	mcast_mac[2] = 0x5e;
	mcast_mac[1] = 0x0;
	mcast_mac[0] = 0x1;
	return eth_current->mcast(eth_current, mcast_mac, join);
}

int eth_init(void)
{
	struct eth_device *old_current;

	if (!eth_current) {
		puts("No ethernet found.\n");
		return -ENODEV;
	}

	old_current = eth_current;
	do {
		debug("Trying %s\n", eth_current->name);

		if (eth_current->init(eth_current, gd->bd) >= 0) {
			eth_current->state = ETH_STATE_ACTIVE;

			return 0;
		}
		debug("FAIL\n");

		eth_try_another(0);
	} while (old_current != eth_current);

	return -ETIMEDOUT;
}

void eth_halt(void)
{
	if (!eth_current)
		return;

	eth_current->halt(eth_current);

	eth_current->state = ETH_STATE_PASSIVE;
}

int eth_is_active(struct eth_device *dev)
{
	return dev && dev->state == ETH_STATE_ACTIVE;
}

int eth_send(void *packet, int length)
{
	int ret;

	if (!eth_current)
		return -ENODEV;

	ret = eth_current->send(eth_current, packet, length);
#if defined(CONFIG_CMD_PCAP)
	if (ret >= 0)
		pcap_post(packet, lengeth, true);
#endif
	return ret;
}

int eth_rx(void)
{
	if (!eth_current)
		return -ENODEV;

	return eth_current->recv(eth_current);
}

#ifdef CONFIG_API
static void eth_save_packet(void *packet, int length)
{
	char *p = packet;
	int i;

	if ((eth_rcv_last+1) % PKTBUFSRX == eth_rcv_current)
		return;

	if (PKTSIZE < length)
		return;

	for (i = 0; i < length; i++)
		eth_rcv_bufs[eth_rcv_last].data[i] = p[i];

	eth_rcv_bufs[eth_rcv_last].length = length;
	eth_rcv_last = (eth_rcv_last + 1) % PKTBUFSRX;
}

int eth_receive(void *packet, int length)
{
	char *p = packet;
	void *pp = push_packet;
	int i;

	if (eth_rcv_current == eth_rcv_last) {
		push_packet = eth_save_packet;
		eth_rx();
		push_packet = pp;

		if (eth_rcv_current == eth_rcv_last)
			return -1;
	}

	length = min(eth_rcv_bufs[eth_rcv_current].length, length);

	for (i = 0; i < length; i++)
		p[i] = eth_rcv_bufs[eth_rcv_current].data[i];

	eth_rcv_current = (eth_rcv_current + 1) % PKTBUFSRX;
	return length;
}
#endif /* CONFIG_API */
Commit	Line	Data
83d290c5	1	// SPDX-License-Identifier: GPL-2.0+
c609719b	2	/*
05c3e68f	3	* (C) Copyright 2001-2015
c609719b	4	* Wolfgang Denk, DENX Software Engineering, [email protected].
05c3e68f	5	* Joe Hershberger, National Instruments
c609719b WD	6	*/
	7
	8	#include <common.h>
	9	#include <command.h>
9fb625ce	10	#include <env.h>
c609719b	11	#include <net.h>
5f184715	12	#include <phy.h>
1221ce45	13	#include <linux/errno.h>
3eaac630	14	#include <net/pcap.h>
818f91eb	15	#include "eth_internal.h"
c609719b	16
d2eaec60 JH	17	DECLARE_GLOBAL_DATA_PTR;
d2eaec60 JH	18
3bc42700 SG	19	/*
	20	* CPU and board-specific Ethernet initializations. Aliased function
	21	* signals caller to move on
	22	*/
	23	static int __def_eth_init(bd_t *bis)
	24	{
	25	return -1;
	26	}
	27	int cpu_eth_init(bd_t *bis) __attribute__((weak, alias("__def_eth_init")));
	28	int board_eth_init(bd_t *bis) __attribute__((weak, alias("__def_eth_init")));
	29
f85b6071	30	#ifdef CONFIG_API
f85b6071 RJ	31	static struct {
	32	uchar data[PKTSIZE];
	33	int length;
	34	} eth_rcv_bufs[PKTBUFSRX];
	35
66c7385a	36	static unsigned int eth_rcv_current, eth_rcv_last;
f85b6071 RJ	37	#endif
f85b6071 RJ	38
f8be7d65 JH	39	static struct eth_device *eth_devices;
f8be7d65 JH	40	struct eth_device *eth_current;
c609719b	41
8607a6bf	42	void eth_set_current_to_next(void)
84eb1fba JH	43	{
	44	eth_current = eth_current->next;
	45	}
	46
8607a6bf	47	void eth_set_dev(struct eth_device *dev)
e58780dc JH	48	{
	49	eth_current = dev;
	50	}
	51
d7fb9bcf	52	struct eth_device eth_get_dev_by_name(const char devname)
63ff004c MB	53	{
	54	struct eth_device dev, target_dev;
	55
7e7f903f HR	56	BUG_ON(devname == NULL);
7e7f903f HR	57
63ff004c MB	58	if (!eth_devices)
	59	return NULL;
	60
	61	dev = eth_devices;
	62	target_dev = NULL;
	63	do {
	64	if (strcmp(devname, dev->name) == 0) {
	65	target_dev = dev;
	66	break;
	67	}
	68	dev = dev->next;
	69	} while (dev != eth_devices);
	70
	71	return target_dev;
	72	}
	73
9e56986a AF	74	struct eth_device *eth_get_dev_by_index(int index)
	75	{
	76	struct eth_device dev, target_dev;
9e56986a AF	77
	78	if (!eth_devices)
	79	return NULL;
	80
	81	dev = eth_devices;
	82	target_dev = NULL;
	83	do {
fea7dcae	84	if (dev->index == index) {
9e56986a AF	85	target_dev = dev;
	86	break;
	87	}
	88	dev = dev->next;
9e56986a AF	89	} while (dev != eth_devices);
	90
	91	return target_dev;
	92	}
	93
66c7385a	94	int eth_get_dev_index(void)
c609719b	95	{
66c7385a	96	if (!eth_current)
fea7dcae	97	return -1;
c609719b	98
fea7dcae	99	return eth_current->index;
c609719b WD	100	}
c609719b WD	101
6e0d26c0 JH	102	static int on_ethaddr(const char name, const char value, enum env_op op,
	103	int flags)
	104	{
	105	int index;
	106	struct eth_device *dev;
	107
	108	if (!eth_devices)
	109	return 0;
	110
	111	/* look for an index after "eth" */
	112	index = simple_strtoul(name + 3, NULL, 10);
	113
	114	dev = eth_devices;
	115	do {
	116	if (dev->index == index) {
	117	switch (op) {
	118	case env_op_create:
	119	case env_op_overwrite:
fb8977c5	120	string_to_enetaddr(value, dev->enetaddr);
73d570a7	121	eth_write_hwaddr(dev, "eth", dev->index);
6e0d26c0 JH	122	break;
6e0d26c0 JH	123	case env_op_delete:
a40db6d5	124	memset(dev->enetaddr, 0, ARP_HLEN);
6e0d26c0 JH	125	}
6e0d26c0 JH	126	}
7aba0f2c	127	dev = dev->next;
6e0d26c0 JH	128	} while (dev != eth_devices);
	129
	130	return 0;
	131	}
	132	U_BOOT_ENV_CALLBACK(ethaddr, on_ethaddr);
	133
7616e785 SG	134	int eth_write_hwaddr(struct eth_device dev, const char base_name,
	135	int eth_number)
	136	{
a40db6d5	137	unsigned char env_enetaddr[ARP_HLEN];
7616e785 SG	138	int ret = 0;
7616e785 SG	139
35affd7a	140	eth_env_get_enetaddr_by_index(base_name, eth_number, env_enetaddr);
7616e785	141
0adb5b76 JH	142	if (!is_zero_ethaddr(env_enetaddr)) {
0adb5b76 JH	143	if (!is_zero_ethaddr(dev->enetaddr) &&
a40db6d5	144	memcmp(dev->enetaddr, env_enetaddr, ARP_HLEN)) {
7616e785	145	printf("\nWarning: %s MAC addresses don't match:\n",
ff819a3a	146	dev->name);
7616e785	147	printf("Address in SROM is %pM\n",
ff819a3a	148	dev->enetaddr);
7616e785	149	printf("Address in environment is %pM\n",
ff819a3a	150	env_enetaddr);
7616e785 SG	151	}
7616e785 SG	152
a40db6d5	153	memcpy(dev->enetaddr, env_enetaddr, ARP_HLEN);
0adb5b76	154	} else if (is_valid_ethaddr(dev->enetaddr)) {
fd1e959e SG	155	eth_env_set_enetaddr_by_index(base_name, eth_number,
fd1e959e SG	156	dev->enetaddr);
0adb5b76	157	} else if (is_zero_ethaddr(dev->enetaddr)) {
bef1014b JH	158	#ifdef CONFIG_NET_RANDOM_ETHADDR
	159	net_random_ethaddr(dev->enetaddr);
	160	printf("\nWarning: %s (eth%d) using random MAC address - %pM\n",
	161	dev->name, eth_number, dev->enetaddr);
	162	#else
75d9a45c PM	163	printf("\nError: %s address not set.\n",
	164	dev->name);
	165	return -EINVAL;
bef1014b	166	#endif
7616e785 SG	167	}
7616e785 SG	168
75d9a45c	169	if (dev->write_hwaddr && !eth_mac_skip(eth_number)) {
0adb5b76	170	if (!is_valid_ethaddr(dev->enetaddr)) {
75d9a45c	171	printf("\nError: %s address %pM illegal value\n",
ff819a3a	172	dev->name, dev->enetaddr);
75d9a45c PM	173	return -EINVAL;
75d9a45c PM	174	}
460f949f	175
7616e785	176	ret = dev->write_hwaddr(dev);
75d9a45c	177	if (ret)
ff819a3a JH	178	printf("\nWarning: %s failed to set MAC address\n",
ff819a3a JH	179	dev->name);
460f949f	180	}
7616e785 SG	181
	182	return ret;
	183	}
	184
89d48367 SG	185	int eth_register(struct eth_device *dev)
	186	{
	187	struct eth_device *d;
66c7385a	188	static int index;
58c583b6	189
f6add132	190	assert(strlen(dev->name) < sizeof(dev->name));
58c583b6	191
89d48367	192	if (!eth_devices) {
ff819a3a JH	193	eth_devices = dev;
ff819a3a JH	194	eth_current = dev;
89d48367	195	eth_current_changed();
c609719b	196	} else {
66c7385a	197	for (d = eth_devices; d->next != eth_devices; d = d->next)
aba4b69d	198	;
c609719b WD	199	d->next = dev;
	200	}
	201
	202	dev->state = ETH_STATE_INIT;
	203	dev->next = eth_devices;
fea7dcae	204	dev->index = index++;
c609719b WD	205
	206	return 0;
	207	}
	208
e7e982d6 VP	209	int eth_unregister(struct eth_device *dev)
	210	{
	211	struct eth_device *cur;
	212
	213	/* No device */
	214	if (!eth_devices)
05324a48	215	return -ENODEV;
e7e982d6 VP	216
	217	for (cur = eth_devices; cur->next != eth_devices && cur->next != dev;
	218	cur = cur->next)
	219	;
	220
	221	/* Device not found */
	222	if (cur->next != dev)
05324a48	223	return -ENODEV;
e7e982d6 VP	224
	225	cur->next = dev->next;
	226
	227	if (eth_devices == dev)
	228	eth_devices = dev->next == eth_devices ? NULL : dev->next;
	229
	230	if (eth_current == dev) {
	231	eth_current = eth_devices;
	232	eth_current_changed();
	233	}
	234
	235	return 0;
	236	}
	237
d2eaec60	238	int eth_initialize(void)
c609719b	239	{
fea7dcae	240	int num_devices = 0;
3bc42700	241
c609719b WD	242	eth_devices = NULL;
c609719b WD	243	eth_current = NULL;
3bc42700	244	eth_common_init();
818f91eb SG	245	/*
	246	* If board-specific initialization exists, call it.
	247	* If not, call a CPU-specific one
	248	*/
	249	if (board_eth_init != __def_eth_init) {
	250	if (board_eth_init(gd->bd) < 0)
	251	printf("Board Net Initialization Failed\n");
	252	} else if (cpu_eth_init != __def_eth_init) {
	253	if (cpu_eth_init(gd->bd) < 0)
	254	printf("CPU Net Initialization Failed\n");
	255	} else {
	256	printf("Net Initialization Skipped\n");
	257	}
d9785c14	258
c609719b	259	if (!eth_devices) {
66c7385a	260	puts("No ethernet found.\n");
770605e4	261	bootstage_error(BOOTSTAGE_ID_NET_ETH_START);
c609719b WD	262	} else {
c609719b WD	263	struct eth_device *dev = eth_devices;
00caae6d	264	char *ethprime = env_get("ethprime");
c609719b	265
770605e4	266	bootstage_mark(BOOTSTAGE_ID_NET_ETH_INIT);
c609719b	267	do {
fea7dcae	268	if (dev->index)
66c7385a	269	puts(", ");
c609719b WD	270
	271	printf("%s", dev->name);
	272
66c7385a	273	if (ethprime && strcmp(dev->name, ethprime) == 0) {
c609719b	274	eth_current = dev;
66c7385a	275	puts(" [PRIME]");
c609719b WD	276	}
c609719b WD	277
1384f3bb	278	if (strchr(dev->name, ' '))
66c7385a JH	279	puts("\nWarning: eth device name has a space!"
66c7385a JH	280	"\n");
1384f3bb	281
75d9a45c	282	eth_write_hwaddr(dev, "eth", dev->index);
c609719b	283
c609719b	284	dev = dev->next;
fea7dcae	285	num_devices++;
66c7385a	286	} while (dev != eth_devices);
c609719b	287
89d48367	288	eth_current_changed();
66c7385a	289	putc('\n');
c609719b WD	290	}
c609719b WD	291
fea7dcae	292	return num_devices;
c609719b WD	293	}
c609719b WD	294
53a5c424 DU	295	/* Multicast.
53a5c424 DU	296	* mcast_addr: multicast ipaddr from which multicast Mac is made
85eb5caf	297	* join: 1=join, 0=leave.
53a5c424	298	*/
049a95a7	299	int eth_mcast_join(struct in_addr mcast_ip, int join)
53a5c424	300	{
a40db6d5	301	u8 mcast_mac[ARP_HLEN];
85eb5caf	302	if (!eth_current \|\| !eth_current->mcast)
53a5c424	303	return -1;
049a95a7 JH	304	mcast_mac[5] = htonl(mcast_ip.s_addr) & 0xff;
	305	mcast_mac[4] = (htonl(mcast_ip.s_addr)>>8) & 0xff;
	306	mcast_mac[3] = (htonl(mcast_ip.s_addr)>>16) & 0x7f;
53a5c424 DU	307	mcast_mac[2] = 0x5e;
	308	mcast_mac[1] = 0x0;
	309	mcast_mac[0] = 0x1;
	310	return eth_current->mcast(eth_current, mcast_mac, join);
	311	}
	312
d2eaec60	313	int eth_init(void)
c609719b	314	{
6e0d26c0	315	struct eth_device *old_current;
c609719b	316
6bc11388	317	if (!eth_current) {
66c7385a	318	puts("No ethernet found.\n");
05324a48	319	return -ENODEV;
6bc11388	320	}
c609719b WD	321
	322	old_current = eth_current;
	323	do {
0ebf04c6	324	debug("Trying %s\n", eth_current->name);
c609719b	325
d2eaec60	326	if (eth_current->init(eth_current, gd->bd) >= 0) {
c609719b WD	327	eth_current->state = ETH_STATE_ACTIVE;
c609719b WD	328
505be87a	329	return 0;
c609719b	330	}
0ebf04c6	331	debug("FAIL\n");
c609719b WD	332
	333	eth_try_another(0);
	334	} while (old_current != eth_current);
	335
05324a48	336	return -ETIMEDOUT;
c609719b WD	337	}
	338
	339	void eth_halt(void)
	340	{
	341	if (!eth_current)
	342	return;
	343
	344	eth_current->halt(eth_current);
	345
	346	eth_current->state = ETH_STATE_PASSIVE;
	347	}
	348
eaa8a195 BN	349	int eth_is_active(struct eth_device *dev)
	350	{
	351	return dev && dev->state == ETH_STATE_ACTIVE;
	352	}
	353
db288a96	354	int eth_send(void *packet, int length)
c609719b	355	{
3eaac630 RF	356	int ret;
3eaac630 RF	357
c609719b	358	if (!eth_current)
05324a48	359	return -ENODEV;
c609719b	360
3eaac630 RF	361	ret = eth_current->send(eth_current, packet, length);
	362	#if defined(CONFIG_CMD_PCAP)
	363	if (ret >= 0)
	364	pcap_post(packet, lengeth, true);
	365	#endif
	366	return ret;
c609719b WD	367	}
	368
	369	int eth_rx(void)
	370	{
	371	if (!eth_current)
05324a48	372	return -ENODEV;
c609719b WD	373
	374	return eth_current->recv(eth_current);
	375	}
	376
f85b6071	377	#ifdef CONFIG_API
db288a96	378	static void eth_save_packet(void *packet, int length)
f85b6071	379	{
db288a96	380	char *p = packet;
f85b6071 RJ	381	int i;
	382
	383	if ((eth_rcv_last+1) % PKTBUFSRX == eth_rcv_current)
	384	return;
	385
	386	if (PKTSIZE < length)
	387	return;
	388
	389	for (i = 0; i < length; i++)
	390	eth_rcv_bufs[eth_rcv_last].data[i] = p[i];
	391
	392	eth_rcv_bufs[eth_rcv_last].length = length;
	393	eth_rcv_last = (eth_rcv_last + 1) % PKTBUFSRX;
	394	}
	395
db288a96	396	int eth_receive(void *packet, int length)
f85b6071	397	{
db288a96	398	char *p = packet;
f85b6071 RJ	399	void *pp = push_packet;
	400	int i;
	401
	402	if (eth_rcv_current == eth_rcv_last) {
	403	push_packet = eth_save_packet;
	404	eth_rx();
	405	push_packet = pp;
	406
	407	if (eth_rcv_current == eth_rcv_last)
	408	return -1;
	409	}
	410
46c07bcf	411	length = min(eth_rcv_bufs[eth_rcv_current].length, length);
f85b6071 RJ	412
	413	for (i = 0; i < length; i++)
	414	p[i] = eth_rcv_bufs[eth_rcv_current].data[i];
	415
	416	eth_rcv_current = (eth_rcv_current + 1) % PKTBUFSRX;
	417	return length;
	418	}
	419	#endif /* CONFIG_API */