iwlwifi: mvm: don't enable A-MSDU when the rates are too low

Allow A-MSDU only when we are not downscaling and the
initial MCS is at least 5.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/rs.c b/drivers/net/wireless/intel/iwlwifi/mvm/rs.c
index 3dc94d2..61d0a8c 100644 (file)
--- a/drivers/net/wireless/intel/iwlwifi/mvm/rs.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/rs.c
@@ -1673,6 +1673,20 @@ static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
        }
 }
 
+static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
+                            struct iwl_scale_tbl_info *tbl,
+                            enum rs_action scale_action)
+{
+       struct iwl_mvm_sta *sta_priv = iwl_mvm_sta_from_mac80211(sta);
+
+       if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
+           tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
+           scale_action == RS_ACTION_DOWNSCALE)
+               sta_priv->tlc_amsdu = false;
+       else
+               sta_priv->tlc_amsdu = true;
+}
+
 /*
  * setup rate table in uCode
  */
@@ -2416,6 +2430,7 @@ lq_update:
                tbl->rate.index = index;
                if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
                        rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
+               rs_set_amsdu_len(mvm, sta, tbl, scale_action);
                rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
        }
 
@@ -3099,6 +3114,7 @@ void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
        sband = hw->wiphy->bands[band];
 
        lq_sta->lq.sta_id = sta_priv->sta_id;
+       sta_priv->tlc_amsdu = false;
 
        for (j = 0; j < LQ_SIZE; j++)
                rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
@@ -3658,10 +3674,13 @@ static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
        ssize_t ret;
 
        struct iwl_lq_sta *lq_sta = file->private_data;
+       struct iwl_mvm_sta *mvmsta =
+               container_of(lq_sta, struct iwl_mvm_sta, lq_sta);
        struct iwl_mvm *mvm;
        struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
        struct rs_rate *rate = &tbl->rate;
        u32 ss_params;
+
        mvm = lq_sta->pers.drv;
        buff = kmalloc(2048, GFP_KERNEL);
        if (!buff)
@@ -3687,10 +3706,11 @@ static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
                                (is_ht20(rate)) ? "20MHz" :
                                (is_ht40(rate)) ? "40MHz" :
                                (is_ht80(rate)) ? "80Mhz" : "BAD BW");
-               desc += sprintf(buff + desc, " %s %s %s\n",
+               desc += sprintf(buff + desc, " %s %s %s %s\n",
                                (rate->sgi) ? "SGI" : "NGI",
                                (rate->ldpc) ? "LDPC" : "BCC",
-                               (lq_sta->is_agg) ? "AGG on" : "");
+                               (lq_sta->is_agg) ? "AGG on" : "",
+                               (mvmsta->tlc_amsdu) ? "AMSDU on" : "");
        }
        desc += sprintf(buff+desc, "last tx rate=0x%X\n",
                        lq_sta->last_rate_n_flags);

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/sta.h b/drivers/net/wireless/intel/iwlwifi/mvm/sta.h
index b01650a..f95f603 100644 (file)
--- a/drivers/net/wireless/intel/iwlwifi/mvm/sta.h
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/sta.h
@@ -313,6 +313,7 @@ struct iwl_mvm_key_pn {
  * @tx_protection: reference counter for controlling the Tx protection.
  * @tt_tx_protection: is thermal throttling enable Tx protection?
  * @disable_tx: is tx to this STA disabled?
+ * @tlc_amsdu: true if A-MSDU is allowed
  * @agg_tids: bitmap of tids whose status is operational aggregated (IWL_AGG_ON)
  * @sleep_tx_count: the number of frames that we told the firmware to let out
  *     even when that station is asleep. This is useful in case the queue
@@ -347,6 +348,7 @@ struct iwl_mvm_sta {
        bool tt_tx_protection;
 
        bool disable_tx;
+       bool tlc_amsdu;
        u8 agg_tids;
        u8 sleep_tx_count;
 };

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/tx.c b/drivers/net/wireless/intel/iwlwifi/mvm/tx.c
index a5a55da..a73ae01 100644 (file)
--- a/drivers/net/wireless/intel/iwlwifi/mvm/tx.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/tx.c
@@ -460,7 +460,8 @@ static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct sk_buff *skb,
                return -EINVAL;
 
        if (!sta->max_amsdu_len ||
-           !ieee80211_is_data_qos(hdr->frame_control)) {
+           !ieee80211_is_data_qos(hdr->frame_control) ||
+           !mvmsta->tlc_amsdu) {
                num_subframes = 1;
                pad = 0;
                goto segment;