[MAC80211]: Add mac80211 wireless stack.

Add mac80211, the IEEE 802.11 software MAC layer.

Signed-off-by: Jiri Benc <jbenc@suse.cz>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 140 insertions, 0 deletions

diff --git a/net/mac80211/ieee80211_rate.c b/net/mac80211/ieee80211_rate.c
new file mode 100644
index 000000000000..16e850864b8a
--- /dev/null
+++ b/net/mac80211/ieee80211_rate.c
@@ -0,0 +1,140 @@
+/*
+ * Copyright 2002-2005, Instant802 Networks, Inc.
+ * Copyright 2005-2006, Devicescape Software, Inc.
+ * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include "ieee80211_rate.h"
+#include "ieee80211_i.h"
+
+struct rate_control_alg {
+        struct list_head list;
+        struct rate_control_ops *ops;
+};
+
+static LIST_HEAD(rate_ctrl_algs);
+static DEFINE_MUTEX(rate_ctrl_mutex);
+
+int ieee80211_rate_control_register(struct rate_control_ops *ops)
+{
+        struct rate_control_alg *alg;
+
+        alg = kmalloc(sizeof(*alg), GFP_KERNEL);
+        if (alg == NULL) {
+                return -ENOMEM;
+        }
+        memset(alg, 0, sizeof(*alg));
+        alg->ops = ops;
+
+        mutex_lock(&rate_ctrl_mutex);
+        list_add_tail(&alg->list, &rate_ctrl_algs);
+        mutex_unlock(&rate_ctrl_mutex);
+
+        return 0;
+}
+EXPORT_SYMBOL(ieee80211_rate_control_register);
+
+void ieee80211_rate_control_unregister(struct rate_control_ops *ops)
+{
+        struct rate_control_alg *alg;
+
+        mutex_lock(&rate_ctrl_mutex);
+        list_for_each_entry(alg, &rate_ctrl_algs, list) {
+                if (alg->ops == ops) {
+                        list_del(&alg->list);
+                        break;
+                }
+        }
+        mutex_unlock(&rate_ctrl_mutex);
+        kfree(alg);
+}
+EXPORT_SYMBOL(ieee80211_rate_control_unregister);
+
+static struct rate_control_ops *
+ieee80211_try_rate_control_ops_get(const char *name)
+{
+        struct rate_control_alg *alg;
+        struct rate_control_ops *ops = NULL;
+
+        mutex_lock(&rate_ctrl_mutex);
+        list_for_each_entry(alg, &rate_ctrl_algs, list) {
+                if (!name || !strcmp(alg->ops->name, name))
+                        if (try_module_get(alg->ops->module)) {
+                                ops = alg->ops;
+                                break;
+                        }
+        }
+        mutex_unlock(&rate_ctrl_mutex);
+        return ops;
+}
+
+/* Get the rate control algorithm. If `name' is NULL, get the first
+ * available algorithm. */
+static struct rate_control_ops *
+ieee80211_rate_control_ops_get(const char *name)
+{
+        struct rate_control_ops *ops;
+
+        ops = ieee80211_try_rate_control_ops_get(name);
+        if (!ops) {
+                request_module("rc80211_%s", name ? name : "default");
+                ops = ieee80211_try_rate_control_ops_get(name);
+        }
+        return ops;
+}
+
+static void ieee80211_rate_control_ops_put(struct rate_control_ops *ops)
+{
+        module_put(ops->module);
+}
+
+struct rate_control_ref *rate_control_alloc(const char *name,
+                                            struct ieee80211_local *local)
+{
+        struct rate_control_ref *ref;
+
+        ref = kmalloc(sizeof(struct rate_control_ref), GFP_KERNEL);
+        if (!ref)
+                goto fail_ref;
+        kref_init(&ref->kref);
+        ref->ops = ieee80211_rate_control_ops_get(name);
+        if (!ref->ops)
+                goto fail_ops;
+        ref->priv = ref->ops->alloc(local);
+        if (!ref->priv)
+                goto fail_priv;
+        return ref;
+
+fail_priv:
+        ieee80211_rate_control_ops_put(ref->ops);
+fail_ops:
+        kfree(ref);
+fail_ref:
+        return NULL;
+}
+
+static void rate_control_release(struct kref *kref)
+{
+        struct rate_control_ref *ctrl_ref;
+
+        ctrl_ref = container_of(kref, struct rate_control_ref, kref);
+        ctrl_ref->ops->free(ctrl_ref->priv);
+        ieee80211_rate_control_ops_put(ctrl_ref->ops);
+        kfree(ctrl_ref);
+}
+
+struct rate_control_ref *rate_control_get(struct rate_control_ref *ref)
+{
+        kref_get(&ref->kref);
+        return ref;
+}
+
+void rate_control_put(struct rate_control_ref *ref)
+{
+        kref_put(&ref->kref, rate_control_release);
+}