upstream u-boot with additional patches for our devices/boards: https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ; Gbit ethernet patch for some LIME2 revisions ; with SPI flash support
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u-boot/net/eth.c

1086 lines
23 KiB

/*
* (C) Copyright 2001-2015
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
* Joe Hershberger, National Instruments
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <command.h>
#include <dm.h>
#include <environment.h>
#include <net.h>
#include <miiphy.h>
#include <phy.h>
#include <asm/errno.h>
#include <dm/device-internal.h>
#include <dm/uclass-internal.h>
DECLARE_GLOBAL_DATA_PTR;
void eth_parse_enetaddr(const char *addr, uchar *enetaddr)
{
char *end;
int i;
for (i = 0; i < 6; ++i) {
enetaddr[i] = addr ? simple_strtoul(addr, &end, 16) : 0;
if (addr)
addr = (*end) ? end + 1 : end;
}
}
int eth_getenv_enetaddr(const char *name, uchar *enetaddr)
{
eth_parse_enetaddr(getenv(name), enetaddr);
return is_valid_ethaddr(enetaddr);
}
int eth_setenv_enetaddr(const char *name, const uchar *enetaddr)
{
char buf[20];
sprintf(buf, "%pM", enetaddr);
return setenv(name, buf);
}
int eth_getenv_enetaddr_by_index(const char *base_name, int index,
uchar *enetaddr)
{
char enetvar[32];
sprintf(enetvar, index ? "%s%daddr" : "%saddr", base_name, index);
return eth_getenv_enetaddr(enetvar, enetaddr);
}
static inline int eth_setenv_enetaddr_by_index(const char *base_name, int index,
uchar *enetaddr)
{
char enetvar[32];
sprintf(enetvar, index ? "%s%daddr" : "%saddr", base_name, index);
return eth_setenv_enetaddr(enetvar, enetaddr);
}
static int eth_mac_skip(int index)
{
char enetvar[15];
char *skip_state;
sprintf(enetvar, index ? "eth%dmacskip" : "ethmacskip", index);
skip_state = getenv(enetvar);
return skip_state != NULL;
}
static void eth_current_changed(void);
/*
* 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")));
static void eth_common_init(void)
{
bootstage_mark(BOOTSTAGE_ID_NET_ETH_START);
#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) || defined(CONFIG_PHYLIB)
miiphy_init();
#endif
#ifdef CONFIG_PHYLIB
phy_init();
#endif
/*
* 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 {
#ifndef CONFIG_DM_ETH
printf("Net Initialization Skipped\n");
#endif
}
}
#ifdef CONFIG_DM_ETH
/**
* struct eth_device_priv - private structure for each Ethernet device
*
* @state: The state of the Ethernet MAC driver (defined by enum eth_state_t)
*/
struct eth_device_priv {
enum eth_state_t state;
};
/**
* struct eth_uclass_priv - The structure attached to the uclass itself
*
* @current: The Ethernet device that the network functions are using
*/
struct eth_uclass_priv {
struct udevice *current;
};
/* eth_errno - This stores the most recent failure code from DM functions */
static int eth_errno;
static struct eth_uclass_priv *eth_get_uclass_priv(void)
{
struct uclass *uc;
uclass_get(UCLASS_ETH, &uc);
assert(uc);
return uc->priv;
}
static void eth_set_current_to_next(void)
{
struct eth_uclass_priv *uc_priv;
uc_priv = eth_get_uclass_priv();
if (uc_priv->current)
uclass_next_device(&uc_priv->current);
if (!uc_priv->current)
uclass_first_device(UCLASS_ETH, &uc_priv->current);
}
/*
* Typically this will simply return the active device.
* In the case where the most recent active device was unset, this will attempt
* to return the first device. If that device doesn't exist or fails to probe,
* this function will return NULL.
*/
struct udevice *eth_get_dev(void)
{
struct eth_uclass_priv *uc_priv;
uc_priv = eth_get_uclass_priv();
if (!uc_priv->current)
eth_errno = uclass_first_device(UCLASS_ETH,
&uc_priv->current);
return uc_priv->current;
}
/*
* Typically this will just store a device pointer.
* In case it was not probed, we will attempt to do so.
* dev may be NULL to unset the active device.
*/
static void eth_set_dev(struct udevice *dev)
{
if (dev && !device_active(dev)) {
eth_errno = device_probe(dev);
if (eth_errno)
dev = NULL;
}
eth_get_uclass_priv()->current = dev;
}
/*
* Find the udevice that either has the name passed in as devname or has an
* alias named devname.
*/
struct udevice *eth_get_dev_by_name(const char *devname)
{
int seq = -1;
char *endp = NULL;
const char *startp = NULL;
struct udevice *it;
struct uclass *uc;
int len = strlen("eth");
/* Must be longer than 3 to be an alias */
if (!strncmp(devname, "eth", len) && strlen(devname) > len) {
startp = devname + len;
seq = simple_strtoul(startp, &endp, 10);
}
uclass_get(UCLASS_ETH, &uc);
uclass_foreach_dev(it, uc) {
/*
* We need the seq to be valid, so try to probe it.
* If the probe fails, the seq will not match since it will be
* -1 instead of what we are looking for.
* We don't care about errors from probe here. Either they won't
* match an alias or it will match a literal name and we'll pick
* up the error when we try to probe again in eth_set_dev().
*/
if (device_probe(it))
continue;
/* Check for the name or the sequence number to match */
if (strcmp(it->name, devname) == 0 ||
(endp > startp && it->seq == seq))
return it;
}
return NULL;
}
unsigned char *eth_get_ethaddr(void)
{
struct eth_pdata *pdata;
if (eth_get_dev()) {
pdata = eth_get_dev()->platdata;
return pdata->enetaddr;
}
return NULL;
}
/* Set active state without calling start on the driver */
int eth_init_state_only(void)
{
struct udevice *current;
struct eth_device_priv *priv;
current = eth_get_dev();
if (!current || !device_active(current))
return -EINVAL;
priv = current->uclass_priv;
priv->state = ETH_STATE_ACTIVE;
return 0;
}
/* Set passive state without calling stop on the driver */
void eth_halt_state_only(void)
{
struct udevice *current;
struct eth_device_priv *priv;
current = eth_get_dev();
if (!current || !device_active(current))
return;
priv = current->uclass_priv;
priv->state = ETH_STATE_PASSIVE;
}
int eth_get_dev_index(void)
{
if (eth_get_dev())
return eth_get_dev()->seq;
return -1;
}
static int eth_write_hwaddr(struct udevice *dev)
{
struct eth_pdata *pdata = dev->platdata;
int ret = 0;
if (!dev || !device_active(dev))
return -EINVAL;
/* seq is valid since the device is active */
if (eth_get_ops(dev)->write_hwaddr && !eth_mac_skip(dev->seq)) {
if (!is_valid_ethaddr(pdata->enetaddr)) {
printf("\nError: %s address %pM illegal value\n",
dev->name, pdata->enetaddr);
return -EINVAL;
}
/*
* Drivers are allowed to decide not to implement this at
* run-time. E.g. Some devices may use it and some may not.
*/
ret = eth_get_ops(dev)->write_hwaddr(dev);
if (ret == -ENOSYS)
ret = 0;
if (ret)
printf("\nWarning: %s failed to set MAC address\n",
dev->name);
}
return ret;
}
static int on_ethaddr(const char *name, const char *value, enum env_op op,
int flags)
{
int index;
int retval;
struct udevice *dev;
/* look for an index after "eth" */
index = simple_strtoul(name + 3, NULL, 10);
retval = uclass_find_device_by_seq(UCLASS_ETH, index, false, &dev);
if (!retval) {
struct eth_pdata *pdata = dev->platdata;
switch (op) {
case env_op_create:
case env_op_overwrite:
eth_parse_enetaddr(value, pdata->enetaddr);
break;
case env_op_delete:
memset(pdata->enetaddr, 0, 6);
}
}
return 0;
}
U_BOOT_ENV_CALLBACK(ethaddr, on_ethaddr);
int eth_init(void)
{
struct udevice *current;
struct udevice *old_current;
int ret = -ENODEV;
current = eth_get_dev();
if (!current) {
printf("No ethernet found.\n");
return -ENODEV;
}
old_current = current;
do {
if (current) {
debug("Trying %s\n", current->name);
if (device_active(current)) {
ret = eth_get_ops(current)->start(current);
if (ret >= 0) {
struct eth_device_priv *priv =
current->uclass_priv;
priv->state = ETH_STATE_ACTIVE;
return 0;
}
} else {
ret = eth_errno;
}
debug("FAIL\n");
} else {
debug("PROBE FAIL\n");
}
/*
* If ethrotate is enabled, this will change "current",
* otherwise we will drop out of this while loop immediately
*/
eth_try_another(0);
/* This will ensure the new "current" attempted to probe */
current = eth_get_dev();
} while (old_current != current);
return ret;
}
void eth_halt(void)
{
struct udevice *current;
struct eth_device_priv *priv;
current = eth_get_dev();
if (!current || !device_active(current))
return;
eth_get_ops(current)->stop(current);
priv = current->uclass_priv;
priv->state = ETH_STATE_PASSIVE;
}
int eth_is_active(struct udevice *dev)
{
struct eth_device_priv *priv;
if (!dev || !device_active(dev))
return 0;
priv = dev_get_uclass_priv(dev);
return priv->state == ETH_STATE_ACTIVE;
}
int eth_send(void *packet, int length)
{
struct udevice *current;
int ret;
current = eth_get_dev();
if (!current)
return -ENODEV;
if (!device_active(current))
return -EINVAL;
ret = eth_get_ops(current)->send(current, packet, length);
if (ret < 0) {
/* We cannot completely return the error at present */
debug("%s: send() returned error %d\n", __func__, ret);
}
return ret;
}
int eth_rx(void)
{
struct udevice *current;
uchar *packet;
int flags;
int ret;
int i;
current = eth_get_dev();
if (!current)
return -ENODEV;
if (!device_active(current))
return -EINVAL;
/* Process up to 32 packets at one time */
flags = ETH_RECV_CHECK_DEVICE;
for (i = 0; i < 32; i++) {
ret = eth_get_ops(current)->recv(current, flags, &packet);
flags = 0;
if (ret > 0)
net_process_received_packet(packet, ret);
if (ret >= 0 && eth_get_ops(current)->free_pkt)
eth_get_ops(current)->free_pkt(current, packet, ret);
if (ret <= 0)
break;
}
if (ret == -EAGAIN)
ret = 0;
if (ret < 0) {
/* We cannot completely return the error at present */
debug("%s: recv() returned error %d\n", __func__, ret);
}
return ret;
}
int eth_initialize(void)
{
int num_devices = 0;
struct udevice *dev;
eth_common_init();
/*
* Devices need to write the hwaddr even if not started so that Linux
* will have access to the hwaddr that u-boot stored for the device.
* This is accomplished by attempting to probe each device and calling
* their write_hwaddr() operation.
*/
uclass_first_device(UCLASS_ETH, &dev);
if (!dev) {
printf("No ethernet found.\n");
bootstage_error(BOOTSTAGE_ID_NET_ETH_START);
} else {
char *ethprime = getenv("ethprime");
struct udevice *prime_dev = NULL;
if (ethprime)
prime_dev = eth_get_dev_by_name(ethprime);
if (prime_dev) {
eth_set_dev(prime_dev);
eth_current_changed();
} else {
eth_set_dev(NULL);
}
bootstage_mark(BOOTSTAGE_ID_NET_ETH_INIT);
do {
if (num_devices)
printf(", ");
printf("eth%d: %s", dev->seq, dev->name);
if (ethprime && dev == prime_dev)
printf(" [PRIME]");
eth_write_hwaddr(dev);
uclass_next_device(&dev);
num_devices++;
} while (dev);
putc('\n');
}
return num_devices;
}
static int eth_post_bind(struct udevice *dev)
{
if (strchr(dev->name, ' ')) {
printf("\nError: eth device name \"%s\" has a space!\n",
dev->name);
return -EINVAL;
}
return 0;
}
static int eth_pre_unbind(struct udevice *dev)
{
/* Don't hang onto a pointer that is going away */
if (dev == eth_get_uclass_priv()->current)
eth_set_dev(NULL);
return 0;
}
static int eth_post_probe(struct udevice *dev)
{
struct eth_device_priv *priv = dev->uclass_priv;
struct eth_pdata *pdata = dev->platdata;
unsigned char env_enetaddr[6];
priv->state = ETH_STATE_INIT;
/* Check if the device has a MAC address in ROM */
if (eth_get_ops(dev)->read_rom_hwaddr)
eth_get_ops(dev)->read_rom_hwaddr(dev);
eth_getenv_enetaddr_by_index("eth", dev->seq, env_enetaddr);
if (!is_zero_ethaddr(env_enetaddr)) {
if (!is_zero_ethaddr(pdata->enetaddr) &&
memcmp(pdata->enetaddr, env_enetaddr, 6)) {
printf("\nWarning: %s MAC addresses don't match:\n",
dev->name);
printf("Address in SROM is %pM\n",
pdata->enetaddr);
printf("Address in environment is %pM\n",
env_enetaddr);
}
/* Override the ROM MAC address */
memcpy(pdata->enetaddr, env_enetaddr, 6);
} else if (is_valid_ethaddr(pdata->enetaddr)) {
eth_setenv_enetaddr_by_index("eth", dev->seq, pdata->enetaddr);
printf("\nWarning: %s using MAC address from ROM\n",
dev->name);
} else if (is_zero_ethaddr(pdata->enetaddr)) {
#ifdef CONFIG_NET_RANDOM_ETHADDR
net_random_ethaddr(pdata->enetaddr);
printf("\nWarning: %s (eth%d) using random MAC address - %pM\n",
dev->name, dev->seq, pdata->enetaddr);
#else
printf("\nError: %s address not set.\n",
dev->name);
return -EINVAL;
#endif
}
return 0;
}
static int eth_pre_remove(struct udevice *dev)
{
struct eth_pdata *pdata = dev->platdata;
eth_get_ops(dev)->stop(dev);
/* clear the MAC address */
memset(pdata->enetaddr, 0, 6);
return 0;
}
UCLASS_DRIVER(eth) = {
.name = "eth",
.id = UCLASS_ETH,
.post_bind = eth_post_bind,
.pre_unbind = eth_pre_unbind,
.post_probe = eth_post_probe,
.pre_remove = eth_pre_remove,
.priv_auto_alloc_size = sizeof(struct eth_uclass_priv),
.per_device_auto_alloc_size = sizeof(struct eth_device_priv),
.flags = DM_UC_FLAG_SEQ_ALIAS,
};
#endif /* #ifdef CONFIG_DM_ETH */
#ifndef CONFIG_DM_ETH
#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;
static void eth_set_current_to_next(void)
{
eth_current = eth_current->next;
}
static 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);
break;
case env_op_delete:
memset(dev->enetaddr, 0, 6);
}
}
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[6];
int ret = 0;
eth_getenv_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, 6)) {
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, 6);
} else if (is_valid_ethaddr(dev->enetaddr)) {
eth_setenv_enetaddr_by_index(base_name, eth_number,
dev->enetaddr);
printf("\nWarning: %s using MAC address from net device\n",
dev->name);
} 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 (!eth_devices) {
puts("No ethernet found.\n");
bootstage_error(BOOTSTAGE_ID_NET_ETH_START);
} else {
struct eth_device *dev = eth_devices;
char *ethprime = getenv("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;
}
#ifdef CONFIG_MCAST_TFTP
/* 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[6];
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);
}
/* the 'way' for ethernet-CRC-32. Spliced in from Linux lib/crc32.c
* and this is the ethernet-crc method needed for TSEC -- and perhaps
* some other adapter -- hash tables
*/
#define CRCPOLY_LE 0xedb88320
u32 ether_crc(size_t len, unsigned char const *p)
{
int i;
u32 crc;
crc = ~0;
while (len--) {
crc ^= *p++;
for (i = 0; i < 8; i++)
crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0);
}
/* an reverse the bits, cuz of way they arrive -- last-first */
crc = (crc >> 16) | (crc << 16);
crc = (crc >> 8 & 0x00ff00ff) | (crc << 8 & 0xff00ff00);
crc = (crc >> 4 & 0x0f0f0f0f) | (crc << 4 & 0xf0f0f0f0);
crc = (crc >> 2 & 0x33333333) | (crc << 2 & 0xcccccccc);
crc = (crc >> 1 & 0x55555555) | (crc << 1 & 0xaaaaaaaa);
return crc;
}
#endif
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);
}
#endif /* ifndef CONFIG_DM_ETH */
#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 */
static void eth_current_changed(void)
{
char *act = getenv("ethact");
/* update current ethernet name */
if (eth_get_dev()) {
if (act == NULL || strcmp(act, eth_get_name()) != 0)
setenv("ethact", eth_get_name());
}
/*
* remove the variable completely if there is no active
* interface
*/
else if (act != NULL)
setenv("ethact", NULL);
}
void eth_try_another(int first_restart)
{
static void *first_failed;
char *ethrotate;
/*
* Do not rotate between network interfaces when
* 'ethrotate' variable is set to 'no'.
*/
ethrotate = getenv("ethrotate");
if ((ethrotate != NULL) && (strcmp(ethrotate, "no") == 0))
return;
if (!eth_get_dev())
return;
if (first_restart)
first_failed = eth_get_dev();
eth_set_current_to_next();
eth_current_changed();
if (first_failed == eth_get_dev())
net_restart_wrap = 1;
}
void eth_set_current(void)
{
static char *act;
static int env_changed_id;
int env_id;
env_id = get_env_id();
if ((act == NULL) || (env_changed_id != env_id)) {
act = getenv("ethact");
env_changed_id = env_id;
}
if (act == NULL) {
char *ethprime = getenv("ethprime");
void *dev = NULL;
if (ethprime)
dev = eth_get_dev_by_name(ethprime);
if (dev)
eth_set_dev(dev);
else
eth_set_dev(NULL);
} else {
eth_set_dev(eth_get_dev_by_name(act));
}
eth_current_changed();
}
const char *eth_get_name(void)
{
return eth_get_dev() ? eth_get_dev()->name : "unknown";
}