mac80211: allow driver to ask for a rate control algorithm

This allows a driver to ask for a specific rate control algorithm.
The rate control algorithm asked for must be registered and be
available as a module or built-in.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 7 insertions, 1 deletions

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 5fcc4c104340..f13c378fde91 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -706,11 +706,16 @@ enum ieee80211_hw_flags {
  *
  * @queues: number of available hardware transmit queues for
  *      data packets. WMM/QoS requires at least four.
+ *
+ * @rate_control_algorithm: rate control algorithm for this hardware.
+ *      If unset (NULL), the default algorithm will be used. Must be
+ *      set before calling ieee80211_register_hw().
  */
 struct ieee80211_hw {
         struct ieee80211_conf conf;
         struct wiphy *wiphy;
         struct workqueue_struct *workqueue;
+        const char *rate_control_algorithm;
         void *priv;
         u32 flags;
         unsigned int extra_tx_headroom;
diff --git a/net/mac80211/ieee80211.c b/net/mac80211/ieee80211.c
index 52ba6ef90685..e0ee65a969bc 100644
--- a/net/mac80211/ieee80211.c
+++ b/net/mac80211/ieee80211.c
@@ -1072,7 +1072,8 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
         ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
         ieee80211_if_set_type(local->mdev, IEEE80211_IF_TYPE_AP);
 
-        result = ieee80211_init_rate_ctrl_alg(local, NULL);
+        result = ieee80211_init_rate_ctrl_alg(local,
+                                              hw->rate_control_algorithm);
         if (result < 0) {
                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
                        "algorithm\n", wiphy_name(local->hw.wiphy));