svn_rev_309

add tap driver for arch=linux

drivers/net/tap.c

@@ -0,0 +1,104 @@
+#include <common.h>
+#include <command.h>
+#include <driver.h>
+#include <malloc.h>
+#include <net.h>
+#include <init.h>
+#include <asm/arch/linux.h>
+
+struct tap_priv {
+	int fd;
+	char name[20];
+};
+
+int tap_eth_send (struct eth_device *edev, void *packet, int length)
+{
+	struct tap_priv *priv = edev->priv;
+
+	linux_write(priv->fd, packet, length);
+	return 0;
+}
+
+int tap_eth_rx (struct eth_device *edev)
+{
+	struct tap_priv *priv = edev->priv;
+	int length;
+
+	length = linux_read_nonblock(priv->fd, NetRxPackets[0], PKTSIZE);
+
+	if (length > 0)
+		NetReceive(NetRxPackets[0], length);
+
+	return 0;
+}
+
+int tap_eth_open(struct eth_device *edev)
+{
+	return 0;
+}
+
+void tap_eth_halt (struct eth_device *edev)
+{
+	/* nothing to do here */
+}
+
+static int tap_get_mac_address(struct eth_device *edev, unsigned char *adr)
+{
+	return -1;
+}
+
+static int tap_set_mac_address(struct eth_device *edev, unsigned char *adr)
+{
+	return 0;
+}
+
+int tap_probe(struct device_d *dev)
+{
+	struct eth_device *edev;
+	struct tap_priv *priv;
+	int ret = 0;
+
+	printf("tap_eth_init()\n");
+
+	priv = malloc(sizeof(struct tap_priv));
+
+	priv->fd = tap_alloc(priv->name);
+	if (priv->fd < 0) {
+		printf("could not get tap device\n");
+		ret = priv->fd;
+		goto out;
+	}
+
+	edev = malloc(sizeof(struct eth_device));
+	dev->type_data = edev;
+	edev->dev = dev;
+	edev->priv = priv;
+
+	edev->open = tap_eth_open;
+	edev->send = tap_eth_send;
+	edev->recv = tap_eth_rx;
+	edev->halt = tap_eth_halt;
+	edev->get_mac_address = tap_get_mac_address;
+	edev->set_mac_address = tap_set_mac_address;
+
+	eth_register(edev);
+
+        return 0;
+out:
+	free(priv);
+	return ret;
+}
+
+static struct driver_d tap_driver = {
+        .name  = "tap",
+        .probe = tap_probe,
+        .type  = DEVICE_TYPE_ETHER,
+};
+
+static int tap_init(void)
+{
+        register_driver(&tap_driver);
+        return 0;
+}
+
+device_initcall(tap_init);