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

// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2001-2015
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 * Joe Hershberger, National Instruments
 */

#include <common.h>
#include <command.h>
#include <environment.h>
#include <net.h>
#include <phy.h>
#include <linux/errno.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:
				eth_parse_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)
{
	if (!eth_current)
		return -ENODEV;

	return eth_current->send(eth_current, packet, length);
}

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