iwlwifi: make aggregation time limit configurable

By default, aggregation time limit is 4000 uSec, add the parameter to
.cfg
to allow this parameter can be configure per device base if needed.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>

3 files changed, 16 insertions, 2 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-rs.c b/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
index 23e5c42e7d7e..7c4deee4c527 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
@@ -2694,8 +2694,18 @@ static void rs_fill_link_cmd(struct iwl_priv *priv,
 
         lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
         lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
+
         lq_cmd->agg_params.agg_time_limit =
                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
+        /*
+         * overwrite if needed, pass aggregation time limit
+         * to uCode in uSec
+         */
+        if (priv && priv->cfg->agg_time_limit &&
+            priv->cfg->agg_time_limit >= LINK_QUAL_AGG_TIME_LIMIT_MIN &&
+            priv->cfg->agg_time_limit <= LINK_QUAL_AGG_TIME_LIMIT_MAX)
+                lq_cmd->agg_params.agg_time_limit =
+                        cpu_to_le16(priv->cfg->agg_time_limit);
 }
 
 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
diff --git a/drivers/net/wireless/iwlwifi/iwl-commands.h b/drivers/net/wireless/iwlwifi/iwl-commands.h
index c6a0470b2f50..14a7a8c0711a 100644
--- a/drivers/net/wireless/iwlwifi/iwl-commands.h
+++ b/drivers/net/wireless/iwlwifi/iwl-commands.h
@@ -2110,8 +2110,10 @@ struct iwl_link_qual_general_params {
  */
 struct iwl_link_qual_agg_params {
 
-        /* Maximum number of uSec in aggregation.
-         * Driver should set this to 4000 (4 milliseconds). */
+        /*
+         *Maximum number of uSec in aggregation.
+         * default set to 4000 (4 milliseconds) if not configured in .cfg
+         */
         __le16 agg_time_limit;
 
         /*
diff --git a/drivers/net/wireless/iwlwifi/iwl-core.h b/drivers/net/wireless/iwlwifi/iwl-core.h
index 702d62bf4ee4..f5586b5e0496 100644
--- a/drivers/net/wireless/iwlwifi/iwl-core.h
+++ b/drivers/net/wireless/iwlwifi/iwl-core.h
@@ -280,6 +280,7 @@ struct iwl_mod_params {
  * @scan_antennas: available antenna for scan operation
  * @need_dc_calib: need to perform init dc calibration
  * @bt_statistics: use BT version of statistics notification
+ * @agg_time_limit: maximum number of uSec in aggregation
  *
  * We enable the driver to be backward compatible wrt API version. The
  * driver specifies which APIs it supports (with @ucode_api_max being the
@@ -350,6 +351,7 @@ struct iwl_cfg {
         u8 scan_tx_antennas[IEEE80211_NUM_BANDS];
         const bool need_dc_calib;
         const bool bt_statistics;
+        u16 agg_time_limit;
 };
 
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