net: rename and refactor eth_rand_ethaddr() function

Some functions in include/net.h are ported from
include/linux/etherdevice.h of Linux Kernel.

For ex.
  is_zero_ether_addr()
  is_multicast_ether_addr()
  is_broadcast_ether_addr()
  is_valid_ether_addr();

So, we should use the same function name as that of Linux Kernel,
eth_rand_addr(), for consistency.

Besides, eth_rand_addr() has been implemented as an inline function.
So it should not be surrounded by #ifdef CONFIG_RANDOM_MACADDR.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

board/buffalo/lsxl/lsxl.c

@@ -231,7 +231,7 @@ static void rescue_mode(void)
 	printf("Entering rescue mode..\n");
 #ifdef CONFIG_RANDOM_MACADDR
 	if (!eth_getenv_enetaddr("ethaddr", enetaddr)) {
-		eth_random_enetaddr(enetaddr);
+		eth_random_addr(enetaddr);
 		if (eth_setenv_enetaddr("ethaddr", enetaddr)) {
 			printf("Failed to set ethernet address\n");
 				set_led(LED_ALARM_BLINKING);

drivers/net/dm9000x.c

@@ -345,7 +345,7 @@ static int dm9000_init(struct eth_device *dev, bd_t *bd)
 	if (!is_valid_ether_addr(dev->enetaddr)) {
 #ifdef CONFIG_RANDOM_MACADDR
 		printf("Bad MAC address (uninitialized EEPROM?), randomizing\n");
-		eth_random_enetaddr(dev->enetaddr);
+		eth_random_addr(dev->enetaddr);
 		printf("MAC: %pM\n", dev->enetaddr);
 #else
 		printf("WARNING: Bad MAC address (uninitialized EEPROM?)\n");

drivers/net/ftmac110.c

@@ -425,7 +425,7 @@ int ftmac110_initialize(bd_t *bis)
 	dev->recv = ftmac110_recv;
 
 	if (!eth_getenv_enetaddr_by_index("eth", card_nr, dev->enetaddr))
-		eth_random_enetaddr(dev->enetaddr);
+		eth_random_addr(dev->enetaddr);
 
 	/* allocate tx descriptors (it must be 16 bytes aligned) */
 	chip->txd = dma_alloc_coherent(

include/net.h

@@ -130,23 +130,6 @@ extern int eth_setenv_enetaddr(char *name, const uchar *enetaddr);
 extern int eth_getenv_enetaddr_by_index(const char *base_name, int index,
 					uchar *enetaddr);
 
-#ifdef CONFIG_RANDOM_MACADDR
-/*
- * The u-boot policy does not allow hardcoded ethernet addresses. Under the
- * following circumstances a random generated address is allowed:
- *  - in emergency cases, where you need a working network connection to set
- *    the ethernet address.
- *    Eg. you want a rescue boot and don't have a serial port to access the
- *    CLI to set environment variables.
- *
- * In these cases, we generate a random locally administered ethernet address.
- *
- * Args:
- *  enetaddr - returns 6 byte hardware address
- */
-extern void eth_random_enetaddr(uchar *enetaddr);
-#endif
-
 extern int usb_eth_initialize(bd_t *bi);
 extern int eth_init(bd_t *bis);			/* Initialize the device */
 extern int eth_send(void *packet, int length);	   /* Send a packet */
@@ -674,6 +657,25 @@ static inline int is_valid_ether_addr(const u8 *addr)
 	return !is_multicast_ether_addr(addr) && !is_zero_ether_addr(addr);
 }
 
+/**
+ * eth_random_addr - Generate software assigned random Ethernet address
+ * @addr: Pointer to a six-byte array containing the Ethernet address
+ *
+ * Generate a random Ethernet address (MAC) that is not multicast
+ * and has the local assigned bit set.
+ */
+static inline void eth_random_addr(uchar *addr)
+{
+	int i;
+	unsigned int seed = get_timer(0);
+
+	for (i = 0; i < 6; i++)
+		addr[i] = rand_r(&seed);
+
+	addr[0] &= 0xfe;	/* clear multicast bit */
+	addr[0] |= 0x02;	/* set local assignment bit (IEEE802) */
+}
+
 /* Convert an IP address to a string */
 extern void ip_to_string(IPaddr_t x, char *s);
 

net/eth.c

@@ -63,28 +63,6 @@ static int eth_mac_skip(int index)
 	return ((skip_state = getenv(enetvar)) != NULL);
 }
 
-#ifdef CONFIG_RANDOM_MACADDR
-void eth_random_enetaddr(uchar *enetaddr)
-{
-	uint32_t rval;
-
-	srand(get_timer(0));
-
-	rval = rand();
-	enetaddr[0] = rval & 0xff;
-	enetaddr[1] = (rval >> 8) & 0xff;
-	enetaddr[2] = (rval >> 16) & 0xff;
-
-	rval = rand();
-	enetaddr[3] = rval & 0xff;
-	enetaddr[4] = (rval >> 8) & 0xff;
-	enetaddr[5] = (rval >> 16) & 0xff;
-
-	/* make sure it's local and unicast */
-	enetaddr[0] = (enetaddr[0] | 0x02) & ~0x01;
-}
-#endif
-
 /*
  * CPU and board-specific Ethernet initializations.  Aliased function
  * signals caller to move on