net: introduce per device index

Instead of counting the device index everytime a functions needs it, store
it in the eth_device struct. eth_register() keeps track of the indices and
updates the device's index number. This simplifies some functions in
net/eth.c.

Additionally, a network driver can now query its index, eg. to get the
correct environment ethaddr name.

Signed-off-by: Michael Walle <michael@walle.cc>
Cc: Prafulla Wadaskar <prafulla@marvell.com>
Cc: Mike Frysinger <vapier@gentoo.com>
Cc: Wolfgang Denk <wd@denx.de>
Acked-by: Mike Frysinger <vapier@gentoo.org>

diff --git a/include/net.h b/include/net.h
index fa5d525..e4d42c2 100644 (file)
--- a/include/net.h
+++ b/include/net.h
@@ -90,6 +90,7 @@ struct eth_device {
 #endif
        int  (*write_hwaddr) (struct eth_device*);
        struct eth_device *next;
+       int index;
        void *priv;
 };
 

diff --git a/net/eth.c b/net/eth.c
index 4280d6d..b4b9b43 100644 (file)
--- a/net/eth.c
+++ b/net/eth.c
@@ -127,7 +127,6 @@ struct eth_device *eth_get_dev_by_name(const char *devname)
 struct eth_device *eth_get_dev_by_index(int index)
 {
        struct eth_device *dev, *target_dev;
-       int idx = 0;
 
        if (!eth_devices)
                return NULL;
@@ -135,12 +134,11 @@ struct eth_device *eth_get_dev_by_index(int index)
        dev = eth_devices;
        target_dev = NULL;
        do {
-               if (idx == index) {
+               if (dev->index == index) {
                        target_dev = dev;
                        break;
                }
                dev = dev->next;
-               idx++;
        } while (dev != eth_devices);
 
        return target_dev;
@@ -148,24 +146,11 @@ struct eth_device *eth_get_dev_by_index(int index)
 
 int eth_get_dev_index (void)
 {
-       struct eth_device *dev;
-       int num = 0;
-
-       if (!eth_devices) {
-               return (-1);
-       }
-
-       for (dev = eth_devices; dev; dev = dev->next) {
-               if (dev == eth_current)
-                       break;
-               ++num;
-       }
-
-       if (dev) {
-               return (num);
+       if (!eth_current) {
+               return -1;
        }
 
-       return (0);
+       return eth_current->index;
 }
 
 static void eth_current_changed(void)
@@ -219,6 +204,7 @@ int eth_write_hwaddr(struct eth_device *dev, const char *base_name,
 int eth_register(struct eth_device *dev)
 {
        struct eth_device *d;
+       static int index = 0;
 
        assert(strlen(dev->name) < NAMESIZE);
 
@@ -233,14 +219,14 @@ int eth_register(struct eth_device *dev)
 
        dev->state = ETH_STATE_INIT;
        dev->next  = eth_devices;
+       dev->index = index++;
 
        return 0;
 }
 
 int eth_initialize(bd_t *bis)
 {
-       int eth_number = 0;
-
+       int num_devices = 0;
        eth_devices = NULL;
        eth_current = NULL;
 
@@ -281,7 +267,7 @@ int eth_initialize(bd_t *bis)
 
                show_boot_progress (65);
                do {
-                       if (eth_number)
+                       if (dev->index)
                                puts (", ");
 
                        printf("%s", dev->name);
@@ -294,18 +280,18 @@ int eth_initialize(bd_t *bis)
                        if (strchr(dev->name, ' '))
                                puts("\nWarning: eth device name has a space!\n");
 
-                       if (eth_write_hwaddr(dev, "eth", eth_number))
+                       if (eth_write_hwaddr(dev, "eth", dev->index))
                                puts("\nWarning: failed to set MAC address\n");
 
-                       eth_number++;
                        dev = dev->next;
+                       num_devices++;
                } while(dev != eth_devices);
 
                eth_current_changed();
                putc ('\n');
        }
 
-       return eth_number;
+       return num_devices;
 }
 
 #ifdef CONFIG_MCAST_TFTP
@@ -356,7 +342,6 @@ u32 ether_crc (size_t len, unsigned char const *p)
 
 int eth_init(bd_t *bis)
 {
-       int eth_number;
        struct eth_device *old_current, *dev;
 
        if (!eth_current) {
@@ -365,16 +350,14 @@ int eth_init(bd_t *bis)
        }
 
        /* Sync environment with network devices */
-       eth_number = 0;
        dev = eth_devices;
        do {
                uchar env_enetaddr[6];
 
-               if (eth_getenv_enetaddr_by_index("eth", eth_number,
+               if (eth_getenv_enetaddr_by_index("eth", dev->index,
                                                 env_enetaddr))
                        memcpy(dev->enetaddr, env_enetaddr, 6);
 
-               ++eth_number;
                dev = dev->next;
        } while (dev != eth_devices);