[netdevice] Add "ifname" setting

Expose the network interface name (e.g. "net0") as a setting.  This
allows a script to obtain the name of the most recently opened network
interface via ${netX/ifname}.

Signed-off-by: Andrew Widdersheim <amwiddersheim@gmail.com>
Modified-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

diff --git a/src/net/netdev_settings.c b/src/net/netdev_settings.c
index edd4c4b9fb39074a3cb43ff41a53f4d1f8f45f28..c4fd369415739f586f906c83a38a28bde972f49e 100644 (file)
--- a/src/net/netdev_settings.c
+++ b/src/net/netdev_settings.c
@@ -65,6 +65,11 @@ const struct setting chip_setting __setting ( SETTING_NETDEV, chip ) = {
        .description = "Chip",
        .type = &setting_type_string,
 };
+const struct setting ifname_setting __setting ( SETTING_NETDEV, ifname ) = {
+       .name = "ifname",
+       .description = "Interface name",
+       .type = &setting_type_string,
+};
 
 /**
  * Store MAC address setting
@@ -199,6 +204,22 @@ static int netdev_fetch_chip ( struct net_device *netdev, void *data,
        return strlen ( chip );
 }
 
+/**
+ * Fetch ifname setting
+ *
+ * @v netdev           Network device
+ * @v data             Buffer to fill with setting data
+ * @v len              Length of buffer
+ * @ret len            Length of setting data, or negative error
+ */
+static int netdev_fetch_ifname ( struct net_device *netdev, void *data,
+                                size_t len ) {
+       const char *ifname = netdev->name;
+
+       strncpy ( data, ifname, len );
+       return strlen ( ifname );
+}
+
 /** A network device setting operation */
 struct netdev_setting_operation {
        /** Setting */
@@ -229,6 +250,7 @@ static struct netdev_setting_operation netdev_setting_operations[] = {
        { &busloc_setting, NULL, netdev_fetch_busloc },
        { &busid_setting, NULL, netdev_fetch_busid },
        { &chip_setting, NULL, netdev_fetch_chip },
+       { &ifname_setting, NULL, netdev_fetch_ifname },
 };
 
 /**