mac80211: make simple rate control algorithm built-in

Too frequently people do not have module autoloading enabled
or fail to install the rate control module correctly, hence
their hardware probing fails due to no rate control algorithm
being available. This makes the 'simple' algorithm built into
the mac80211 module unless EMBEDDED is enabled in which case
it can be disabled (eg. if the wanted driver requires another
rate control algorithm.)

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Michael Buesch <mb@bu3sch.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/net/mac80211/Kconfig b/net/mac80211/Kconfig
index 6fffb3845ab6c76b341819376def9f1c77e68424..32c8c08c4683eada896e06cbb326f5560372b821 100644 (file)
--- a/net/mac80211/Kconfig
+++ b/net/mac80211/Kconfig
@@ -13,6 +13,18 @@ config MAC80211
        This option enables the hardware independent IEEE 802.11
        networking stack.
 
+config MAC80211_RCSIMPLE
+       bool "'simple' rate control algorithm"
+       default y
+       depends on MAC80211 && EMBEDDED
+       help
+         This option allows you to turn off the 'simple' rate
+         control algorithm in mac80211. If you do turn it off,
+         you absolutely need another rate control algorithm.
+
+         Say Y unless you know you will have another algorithm
+         available.
+
 config MAC80211_LEDS
        bool "Enable LED triggers"
        depends on MAC80211 && LEDS_TRIGGERS

diff --git a/net/mac80211/Makefile b/net/mac80211/Makefile
index 219cd9f9341fe099bc0ce5ba69c2da7442339ab8..1e6237b3484662ffe65a207a3a35a5bbd202f7d2 100644 (file)
--- a/net/mac80211/Makefile
+++ b/net/mac80211/Makefile
@@ -1,8 +1,9 @@
-obj-$(CONFIG_MAC80211) += mac80211.o rc80211_simple.o
+obj-$(CONFIG_MAC80211) += mac80211.o
 
 mac80211-objs-$(CONFIG_MAC80211_LEDS) += ieee80211_led.o
 mac80211-objs-$(CONFIG_MAC80211_DEBUGFS) += debugfs.o debugfs_sta.o debugfs_netdev.o debugfs_key.o
 mac80211-objs-$(CONFIG_NET_SCHED) += wme.o
+mac80211-objs-$(CONFIG_MAC80211_RCSIMPLE) += rc80211_simple.o
 
 mac80211-objs := \
        ieee80211.o \

diff --git a/net/mac80211/ieee80211.c b/net/mac80211/ieee80211.c
index f484ca7ade9ce9ff718015cef06517e7b52d13a4..52ba6ef906853ec1b431c7c648bdc964b9624248 100644 (file)
--- a/net/mac80211/ieee80211.c
+++ b/net/mac80211/ieee80211.c
@@ -1233,8 +1233,17 @@ static int __init ieee80211_init(void)
 
        BUILD_BUG_ON(sizeof(struct ieee80211_tx_packet_data) > sizeof(skb->cb));
 
+#ifdef CONFIG_MAC80211_RCSIMPLE
+       ret = ieee80211_rate_control_register(&mac80211_rcsimple);
+       if (ret)
+               return ret;
+#endif
+
        ret = ieee80211_wme_register();
        if (ret) {
+#ifdef CONFIG_MAC80211_RCSIMPLE
+               ieee80211_rate_control_unregister(&mac80211_rcsimple);
+#endif
                printk(KERN_DEBUG "ieee80211_init: failed to "
                       "initialize WME (err=%d)\n", ret);
                return ret;
@@ -1248,6 +1257,10 @@ static int __init ieee80211_init(void)
 
 static void __exit ieee80211_exit(void)
 {
+#ifdef CONFIG_MAC80211_RCSIMPLE
+       ieee80211_rate_control_unregister(&mac80211_rcsimple);
+#endif
+
        ieee80211_wme_unregister();
        ieee80211_debugfs_netdev_exit();
 }

diff --git a/net/mac80211/ieee80211_rate.c b/net/mac80211/ieee80211_rate.c
index 93abb8fff1410f254c9fb6adf04ad34823bc80a5..e4bd8481554d4fdba55503e64aed7ac404af9938 100644 (file)
--- a/net/mac80211/ieee80211_rate.c
+++ b/net/mac80211/ieee80211_rate.c
@@ -25,6 +25,9 @@ int ieee80211_rate_control_register(struct rate_control_ops *ops)
 {
        struct rate_control_alg *alg;
 
+       if (!ops->name)
+               return -EINVAL;
+
        alg = kzalloc(sizeof(*alg), GFP_KERNEL);
        if (alg == NULL) {
                return -ENOMEM;
@@ -61,9 +64,12 @@ ieee80211_try_rate_control_ops_get(const char *name)
        struct rate_control_alg *alg;
        struct rate_control_ops *ops = NULL;
 
+       if (!name)
+               return NULL;
+
        mutex_lock(&rate_ctrl_mutex);
        list_for_each_entry(alg, &rate_ctrl_algs, list) {
-               if (!name || !strcmp(alg->ops->name, name))
+               if (!strcmp(alg->ops->name, name))
                        if (try_module_get(alg->ops->module)) {
                                ops = alg->ops;
                                break;
@@ -80,9 +86,12 @@ ieee80211_rate_control_ops_get(const char *name)
 {
        struct rate_control_ops *ops;
 
+       if (!name)
+               name = "simple";
+
        ops = ieee80211_try_rate_control_ops_get(name);
        if (!ops) {
-               request_module("rc80211_%s", name ? name : "default");
+               request_module("rc80211_%s", name);
                ops = ieee80211_try_rate_control_ops_get(name);
        }
        return ops;

diff --git a/net/mac80211/ieee80211_rate.h b/net/mac80211/ieee80211_rate.h
index 7cd1ebab4f8345f4cdf008b17ecc134254c45c39..23688139ffb3ea399292ce2b6842f55c91371d34 100644 (file)
--- a/net/mac80211/ieee80211_rate.h
+++ b/net/mac80211/ieee80211_rate.h
@@ -65,6 +65,9 @@ struct rate_control_ref {
        struct kref kref;
 };
 
+/* default 'simple' algorithm */
+extern struct rate_control_ops mac80211_rcsimple;
+
 int ieee80211_rate_control_register(struct rate_control_ops *ops);
 void ieee80211_rate_control_unregister(struct rate_control_ops *ops);
 

diff --git a/net/mac80211/rc80211_simple.c b/net/mac80211/rc80211_simple.c
index 314b8de888625c576a02fbd50caa01fc7787d84d..da72737364e42bb5d8fc68255603befad39bd535 100644 (file)
--- a/net/mac80211/rc80211_simple.c
+++ b/net/mac80211/rc80211_simple.c
@@ -7,7 +7,6 @@
  * published by the Free Software Foundation.
  */
 
-#include <linux/module.h>
 #include <linux/init.h>
 #include <linux/netdevice.h>
 #include <linux/types.h>
@@ -29,8 +28,6 @@
 #define RATE_CONTROL_INTERVAL (HZ / 20)
 #define RATE_CONTROL_MIN_TX 10
 
-MODULE_ALIAS("rc80211_default");
-
 static void rate_control_rate_inc(struct ieee80211_local *local,
                                  struct sta_info *sta)
 {
@@ -394,8 +391,7 @@ static void rate_control_simple_remove_sta_debugfs(void *priv, void *priv_sta)
 }
 #endif
 
-static struct rate_control_ops rate_control_simple = {
-       .module = THIS_MODULE,
+struct rate_control_ops mac80211_rcsimple = {
        .name = "simple",
        .tx_status = rate_control_simple_tx_status,
        .get_rate = rate_control_simple_get_rate,
@@ -410,22 +406,3 @@ static struct rate_control_ops rate_control_simple = {
        .remove_sta_debugfs = rate_control_simple_remove_sta_debugfs,
 #endif
 };
-
-
-static int __init rate_control_simple_init(void)
-{
-       return ieee80211_rate_control_register(&rate_control_simple);
-}
-
-
-static void __exit rate_control_simple_exit(void)
-{
-       ieee80211_rate_control_unregister(&rate_control_simple);
-}
-
-
-subsys_initcall(rate_control_simple_init);
-module_exit(rate_control_simple_exit);
-
-MODULE_DESCRIPTION("Simple rate control algorithm for ieee80211");
-MODULE_LICENSE("GPL");