mac80211: store tx power value from user to station

This patch introduce a new driver callback drv_sta_set_txpwr. This API will
copy the transmit power value passed from user space and call the driver
callback to set the tx power for the station.

Co-developed-by: Balaji Pothunoori <bpothuno@codeaurora.org>
Signed-off-by: Ashok Raj Nagarajan <arnagara@codeaurora.org>
Signed-off-by: Balaji Pothunoori <bpothuno@codeaurora.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

5 files changed, 87 insertions, 0 deletions

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index c10abca55fde..d66fbfe8d55d 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -1890,6 +1890,24 @@ struct ieee80211_sta_rates {
 };
 
 /**
+ * struct ieee80211_sta_txpwr - station txpower configuration
+ *
+ * Used to configure txpower for station.
+ *
+ * @power: indicates the tx power, in dBm, to be used when sending data frames
+ *      to the STA.
+ * @type: In particular if TPC %type is NL80211_TX_POWER_LIMITED then tx power
+ *      will be less than or equal to specified from userspace, whereas if TPC
+ *      %type is NL80211_TX_POWER_AUTOMATIC then it indicates default tx power.
+ *      NL80211_TX_POWER_FIXED is not a valid configuration option for
+ *      per peer TPC.
+ */
+struct ieee80211_sta_txpwr {
+        s16 power;
+        enum nl80211_tx_power_setting type;
+};
+
+/**
  * struct ieee80211_sta - station table entry
  *
  * A station table entry represents a station we are possibly
@@ -1975,6 +1993,7 @@ struct ieee80211_sta {
         bool support_p2p_ps;
         u16 max_rc_amsdu_len;
         u16 max_tid_amsdu_len[IEEE80211_NUM_TIDS];
+        struct ieee80211_sta_txpwr txpwr;
 
         struct ieee80211_txq *txq[IEEE80211_NUM_TIDS + 1];
 
@@ -3800,6 +3819,9 @@ struct ieee80211_ops {
 #endif
         void (*sta_notify)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
                         enum sta_notify_cmd, struct ieee80211_sta *sta);
+        int (*sta_set_txpwr)(struct ieee80211_hw *hw,
+                             struct ieee80211_vif *vif,
+                             struct ieee80211_sta *sta);
         int (*sta_state)(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
                          struct ieee80211_sta *sta,
                          enum ieee80211_sta_state old_state,
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 14bbb7e8ad0e..ba6e4080d63d 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1457,6 +1457,15 @@ static int sta_apply_parameters(struct ieee80211_local *local,
         if (params->listen_interval >= 0)
                 sta->listen_interval = params->listen_interval;
 
+        if (params->sta_modify_mask & STATION_PARAM_APPLY_STA_TXPOWER) {
+                sta->sta.txpwr.type = params->txpwr.type;
+                if (params->txpwr.type == NL80211_TX_POWER_LIMITED)
+                        sta->sta.txpwr.power = params->txpwr.power;
+                ret = drv_sta_set_txpwr(local, sdata, sta);
+                if (ret)
+                        return ret;
+        }
+
         if (params->supported_rates) {
                 ieee80211_parse_bitrates(&sdata->vif.bss_conf.chandef,
                                          sband, params->supported_rates,
diff --git a/net/mac80211/driver-ops.c b/net/mac80211/driver-ops.c
index bb886e7db47f..839c0022a29c 100644
--- a/net/mac80211/driver-ops.c
+++ b/net/mac80211/driver-ops.c
@@ -138,6 +138,27 @@ int drv_sta_state(struct ieee80211_local *local,
         return ret;
 }
 
+__must_check
+int drv_sta_set_txpwr(struct ieee80211_local *local,
+                      struct ieee80211_sub_if_data *sdata,
+                      struct sta_info *sta)
+{
+        int ret = -EOPNOTSUPP;
+
+        might_sleep();
+
+        sdata = get_bss_sdata(sdata);
+        if (!check_sdata_in_driver(sdata))
+                return -EIO;
+
+        trace_drv_sta_set_txpwr(local, sdata, &sta->sta);
+        if (local->ops->sta_set_txpwr)
+                ret = local->ops->sta_set_txpwr(&local->hw, &sdata->vif,
+                                                &sta->sta);
+        trace_drv_return_int(local, ret);
+        return ret;
+}
+
 void drv_sta_rc_update(struct ieee80211_local *local,
                        struct ieee80211_sub_if_data *sdata,
                        struct ieee80211_sta *sta, u32 changed)
diff --git a/net/mac80211/driver-ops.h b/net/mac80211/driver-ops.h
index 28d022a3eee3..62edfa6a73ed 100644
--- a/net/mac80211/driver-ops.h
+++ b/net/mac80211/driver-ops.h
@@ -529,6 +529,11 @@ int drv_sta_state(struct ieee80211_local *local,
                   enum ieee80211_sta_state old_state,
                   enum ieee80211_sta_state new_state);
 
+__must_check
+int drv_sta_set_txpwr(struct ieee80211_local *local,
+                      struct ieee80211_sub_if_data *sdata,
+                      struct sta_info *sta);
+
 void drv_sta_rc_update(struct ieee80211_local *local,
                        struct ieee80211_sub_if_data *sdata,
                        struct ieee80211_sta *sta, u32 changed);
diff --git a/net/mac80211/trace.h b/net/mac80211/trace.h
index 8ba70d26b82e..3bb4459b52c7 100644
--- a/net/mac80211/trace.h
+++ b/net/mac80211/trace.h
@@ -828,6 +828,36 @@ TRACE_EVENT(drv_sta_state,
         )
 );
 
+TRACE_EVENT(drv_sta_set_txpwr,
+        TP_PROTO(struct ieee80211_local *local,
+                 struct ieee80211_sub_if_data *sdata,
+                 struct ieee80211_sta *sta),
+
+        TP_ARGS(local, sdata, sta),
+
+        TP_STRUCT__entry(
+                LOCAL_ENTRY
+                VIF_ENTRY
+                STA_ENTRY
+                __field(s16, txpwr)
+                __field(u8, type)
+        ),
+
+        TP_fast_assign(
+                LOCAL_ASSIGN;
+                VIF_ASSIGN;
+                STA_ASSIGN;
+                __entry->txpwr = sta->txpwr.power;
+                __entry->type = sta->txpwr.type;
+        ),
+
+        TP_printk(
+                LOCAL_PR_FMT  VIF_PR_FMT  STA_PR_FMT " txpwr: %d type %d",
+                LOCAL_PR_ARG, VIF_PR_ARG, STA_PR_ARG,
+                __entry->txpwr,  __entry->type
+        )
+);
+
 TRACE_EVENT(drv_sta_rc_update,
         TP_PROTO(struct ieee80211_local *local,
                  struct ieee80211_sub_if_data *sdata,