netdev: add a way to get it by name and show it in /dev

kernel-src/io/net/netdev.c

@@ -0,0 +1,44 @@
+#include <kernel/net.h>
+#include <kernel/devfs.h>
+#include <hashtable.h>
+#include <mutex.h>
+#include <string.h>
+#include <logging.h>
+
+static hashtable_t nametable;
+static mutex_t tablelock;
+
+static devops_t devops = {0};
+
+int netdev_register(netdev_t *netdev, char *name) {
+	MUTEX_ACQUIRE(&tablelock, false);
+	int e = hashtable_set(&nametable, netdev, name, strlen(name), true);
+	if (e)
+		goto leave;
+
+
+	e = devfs_register(&devops, name, V_TYPE_CHDEV, DEV_MAJOR_NET, 0, 0644);
+	if (e)
+		hashtable_remove(&nametable, name, strlen(name));
+
+	leave:
+	MUTEX_RELEASE(&tablelock);
+	return e;
+}
+
+netdev_t *netdev_getdev(char *name) {
+	MUTEX_ACQUIRE(&tablelock, false);
+	netdev_t *netdev = NULL;
+	void *tmp;
+
+	if (hashtable_get(&nametable, &tmp, name, strlen(name)) == 0)
+		netdev = tmp;
+
+	MUTEX_RELEASE(&tablelock);
+	return netdev;
+}
+
+void netdev_init() {
+	__assert(hashtable_init(&nametable, 10) == 0);
+	MUTEX_INIT(&tablelock);
+}