mac80211: Add new callback set_coverage_class

Mac80211 callback to driver set_coverage_class() sets slot time and ACK
timeout for given IEEE 802.11 coverage class. The callback is optional,
but it's essential for long distance links.

Signed-off-by: Lukas Turek <8an@praha12.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

4 files changed, 50 insertions, 0 deletions

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index f073a2a50574..ad4b70034e77 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -1533,6 +1533,10 @@ enum ieee80211_ampdu_mlme_action {
  *      and need to call wiphy_rfkill_set_hw_state() in the callback.
  *      The callback can sleep.
  *
+ * @set_coverage_class: Set slot time for given coverage class as specified
+ *      in IEEE 802.11-2007 section 17.3.8.6 and modify ACK timeout
+ *      accordingly. This callback is not required and may sleep.
+ *
  * @testmode_cmd: Implement a cfg80211 test mode command.
  *      The callback can sleep.
  *
@@ -1592,6 +1596,7 @@ struct ieee80211_ops {
                             struct ieee80211_sta *sta, u16 tid, u16 *ssn);
 
         void (*rfkill_poll)(struct ieee80211_hw *hw);
+        void (*set_coverage_class)(struct ieee80211_hw *hw, u8 coverage_class);
 #ifdef CONFIG_NL80211_TESTMODE
         int (*testmode_cmd)(struct ieee80211_hw *hw, void *data, int len);
 #endif
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 2e5e841e9b7b..976014c5e742 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1230,6 +1230,13 @@ static int ieee80211_set_wiphy_params(struct wiphy *wiphy, u32 changed)
         struct ieee80211_local *local = wiphy_priv(wiphy);
         int err;
 
+        if (changed & WIPHY_PARAM_COVERAGE_CLASS) {
+                err = drv_set_coverage_class(local, wiphy->coverage_class);
+
+                if (err)
+                        return err;
+        }
+
         if (changed & WIPHY_PARAM_RTS_THRESHOLD) {
                 err = drv_set_rts_threshold(local, wiphy->rts_threshold);
 
diff --git a/net/mac80211/driver-ops.h b/net/mac80211/driver-ops.h
index 8757ea73d544..de91d39e0276 100644
--- a/net/mac80211/driver-ops.h
+++ b/net/mac80211/driver-ops.h
@@ -214,6 +214,21 @@ static inline int drv_set_rts_threshold(struct ieee80211_local *local,
         return ret;
 }
 
+static inline int drv_set_coverage_class(struct ieee80211_local *local,
+                                         u8 value)
+{
+        int ret = 0;
+        might_sleep();
+
+        if (local->ops->set_coverage_class)
+                local->ops->set_coverage_class(&local->hw, value);
+        else
+                ret = -EOPNOTSUPP;
+
+        trace_drv_set_coverage_class(local, value, ret);
+        return ret;
+}
+
 static inline void drv_sta_notify(struct ieee80211_local *local,
                                   struct ieee80211_sub_if_data *sdata,
                                   enum sta_notify_cmd cmd,
diff --git a/net/mac80211/driver-trace.h b/net/mac80211/driver-trace.h
index 977cc7528bc6..0ea258123b8e 100644
--- a/net/mac80211/driver-trace.h
+++ b/net/mac80211/driver-trace.h
@@ -491,6 +491,29 @@ TRACE_EVENT(drv_set_rts_threshold,
         )
 );
 
+TRACE_EVENT(drv_set_coverage_class,
+        TP_PROTO(struct ieee80211_local *local, u8 value, int ret),
+
+        TP_ARGS(local, value, ret),
+
+        TP_STRUCT__entry(
+                LOCAL_ENTRY
+                __field(u8, value)
+                __field(int, ret)
+        ),
+
+        TP_fast_assign(
+                LOCAL_ASSIGN;
+                __entry->ret = ret;
+                __entry->value = value;
+        ),
+
+        TP_printk(
+                LOCAL_PR_FMT " value:%d ret:%d",
+                LOCAL_PR_ARG, __entry->value, __entry->ret
+        )
+);
+
 TRACE_EVENT(drv_sta_notify,
         TP_PROTO(struct ieee80211_local *local,
                  struct ieee80211_sub_if_data *sdata,