[netdevice] Add "chip" setting

Suggested-by: Robin Smidsrød <robin@smidsrod.no>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/net/netdev_settings.c

@@ -45,6 +45,113 @@ struct setting busid_setting __setting ( SETTING_NETDEV ) = {
 	.description = "Bus ID",
 	.type = &setting_type_hex,
 };
+struct setting chip_setting __setting ( SETTING_NETDEV ) = {
+	.name = "chip",
+	.description = "Chip",
+	.type = &setting_type_string,
+};
+
+/**
+ * Store MAC address setting
+ *
+ * @v netdev		Network device
+ * @v data		Setting data, or NULL to clear setting
+ * @v len		Length of setting data
+ * @ret rc		Return status code
+ */
+static int netdev_store_mac ( struct net_device *netdev,
+			      const void *data, size_t len ) {
+
+	if ( len != netdev->ll_protocol->ll_addr_len )
+		return -EINVAL;
+	memcpy ( netdev->ll_addr, data, len );
+	return 0;
+}
+
+/**
+ * Fetch MAC address 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_mac ( struct net_device *netdev, void *data,
+			      size_t len ) {
+
+	if ( len > netdev->ll_protocol->ll_addr_len )
+		len = netdev->ll_protocol->ll_addr_len;
+	memcpy ( data, netdev->ll_addr, len );
+	return netdev->ll_protocol->ll_addr_len;
+}
+
+/**
+ * Fetch bus ID 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_busid ( struct net_device *netdev, void *data,
+				size_t len ) {
+	struct device_description *desc = &netdev->dev->desc;
+	struct dhcp_netdev_desc dhcp_desc;
+
+	dhcp_desc.type = desc->bus_type;
+	dhcp_desc.vendor = htons ( desc->vendor );
+	dhcp_desc.device = htons ( desc->device );
+	if ( len > sizeof ( dhcp_desc ) )
+		len = sizeof ( dhcp_desc );
+	memcpy ( data, &dhcp_desc, len );
+	return sizeof ( dhcp_desc );
+}
+
+/**
+ * Fetch chip 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_chip ( struct net_device *netdev, void *data,
+			       size_t len ) {
+	const char *chip = netdev->dev->driver_name;
+
+	strncpy ( data, chip, len );
+	return strlen ( chip );
+}
+
+/** A network device setting operation */
+struct netdev_setting_operation {
+	/** Setting */
+	struct setting *setting;
+	/** Store setting (or NULL if not supported)
+	 *
+	 * @v netdev		Network device
+	 * @v data		Setting data, or NULL to clear setting
+	 * @v len		Length of setting data
+	 * @ret rc		Return status code
+	 */
+	int ( * store ) ( struct net_device *netdev, const void *data,
+			  size_t len );
+	/** Fetch 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
+	 */
+	int ( * fetch ) ( struct net_device *netdev, void *data, size_t len );
+};
+
+/** Network device settings */
+static struct netdev_setting_operation netdev_setting_operations[] = {
+	{ &mac_setting, netdev_store_mac, netdev_fetch_mac },
+	{ &busid_setting, NULL, netdev_fetch_busid },
+	{ &chip_setting, NULL, netdev_fetch_chip },
+};
 
 /**
  * Store value of network device setting
@@ -59,15 +166,21 @@ static int netdev_store ( struct settings *settings, struct setting *setting,
 			  const void *data, size_t len ) {
 	struct net_device *netdev = container_of ( settings, struct net_device,
 						   settings.settings );
+	struct netdev_setting_operation *op;
+	unsigned int i;
 
-	if ( setting_cmp ( setting, &mac_setting ) == 0 ) {
-		if ( len != netdev->ll_protocol->ll_addr_len )
-			return -EINVAL;
-		memcpy ( netdev->ll_addr, data, len );
-		return 0;
+	/* Handle network device-specific settings */
+	for ( i = 0 ; i < ( sizeof ( netdev_setting_operations ) /
+			    sizeof ( netdev_setting_operations[0] ) ) ; i++ ) {
+		op = &netdev_setting_operations[i];
+		if ( setting_cmp ( setting, op->setting ) == 0 ) {
+			if ( op->store ) {
+				return op->store ( netdev, data, len );
+			} else {
+				return -ENOTSUP;
+			}
+		}
 	}
-	if ( setting_cmp ( setting, &busid_setting ) == 0 )
-		return -ENOTSUP;
 
 	return generic_settings_store ( settings, setting, data, len );
 }
@@ -77,31 +190,23 @@ static int netdev_store ( struct settings *settings, struct setting *setting,
  *
  * @v settings		Settings block
  * @v setting		Setting to fetch
- * @v data		Setting data, or NULL to clear setting
- * @v len		Length of setting data
- * @ret rc		Return status code
+ * @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 ( struct settings *settings, struct setting *setting,
 			  void *data, size_t len ) {
 	struct net_device *netdev = container_of ( settings, struct net_device,
 						   settings.settings );
-	struct device_description *desc = &netdev->dev->desc;
-	struct dhcp_netdev_desc dhcp_desc;
+	struct netdev_setting_operation *op;
+	unsigned int i;
 
-	if ( setting_cmp ( setting, &mac_setting ) == 0 ) {
-		if ( len > netdev->ll_protocol->ll_addr_len )
-			len = netdev->ll_protocol->ll_addr_len;
-		memcpy ( data, netdev->ll_addr, len );
-		return netdev->ll_protocol->ll_addr_len;
-	}
-	if ( setting_cmp ( setting, &busid_setting ) == 0 ) {
-		dhcp_desc.type = desc->bus_type;
-		dhcp_desc.vendor = htons ( desc->vendor );
-		dhcp_desc.device = htons ( desc->device );
-		if ( len > sizeof ( dhcp_desc ) )
-			len = sizeof ( dhcp_desc );
-		memcpy ( data, &dhcp_desc, len );
-		return sizeof ( dhcp_desc );
+	/* Handle network device-specific settings */
+	for ( i = 0 ; i < ( sizeof ( netdev_setting_operations ) /
+			    sizeof ( netdev_setting_operations[0] ) ) ; i++ ) {
+		op = &netdev_setting_operations[i];
+		if ( setting_cmp ( setting, op->setting ) == 0 )
+			return op->fetch ( netdev, data, len );
 	}
 
 	return generic_settings_fetch ( settings, setting, data, len );