iwlwifi: advertise maximal MPDU length when Rx MQ is supported

The new hardware that supports multiple queue also
de-aggregates A-MSDUs. This means that we can advertise
the maximal size of A-MSDUs regardless of the receive
buffer's size.
In order to be able to forcefully use a lower A-MSDU size,
add a default value for the module parameter. Pre-9000
will have a default of 4K, and 9000 will have 12K.
Setting the amsdu_size module parameter to 4K will limit
the A-MSDU on 9000 as well.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

6 files changed, 23 insertions, 6 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/dvm/main.c b/drivers/net/wireless/intel/iwlwifi/dvm/main.c
index 37b32a6f60fd..591591418316 100644
--- a/drivers/net/wireless/intel/iwlwifi/dvm/main.c
+++ b/drivers/net/wireless/intel/iwlwifi/dvm/main.c
@@ -1317,6 +1317,7 @@ static struct iwl_op_mode *iwl_op_mode_dvm_start(struct iwl_trans *trans,
         trans_cfg.n_no_reclaim_cmds = ARRAY_SIZE(no_reclaim_cmds);
 
         switch (iwlwifi_mod_params.amsdu_size) {
+        case IWL_AMSDU_DEF:
         case IWL_AMSDU_4K:
                 trans_cfg.rx_buf_size = IWL_AMSDU_4K;
                 break;
diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-drv.c b/drivers/net/wireless/intel/iwlwifi/iwl-drv.c
index 60a6c36904e4..5c5b9f228ac6 100644
--- a/drivers/net/wireless/intel/iwlwifi/iwl-drv.c
+++ b/drivers/net/wireless/intel/iwlwifi/iwl-drv.c
@@ -1655,7 +1655,8 @@ MODULE_PARM_DESC(11n_disable,
         "disable 11n functionality, bitmap: 1: full, 2: disable agg TX, 4: disable agg RX, 8 enable agg TX");
 module_param_named(amsdu_size, iwlwifi_mod_params.amsdu_size,
                    int, S_IRUGO);
-MODULE_PARM_DESC(amsdu_size, "amsdu size 0:4K 1:8K 2:12K (default 0)");
+MODULE_PARM_DESC(amsdu_size,
+                 "amsdu size 0: 12K for multi Rx queue devices, 4K for other devices 1:4K 2:8K 3:12K (default 0)");
 module_param_named(fw_restart, iwlwifi_mod_params.restart_fw, bool, S_IRUGO);
 MODULE_PARM_DESC(fw_restart, "restart firmware in case of error (default true)");
 
diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-eeprom-parse.c b/drivers/net/wireless/intel/iwlwifi/iwl-eeprom-parse.c
index bf1b69aec813..3199d345b427 100644
--- a/drivers/net/wireless/intel/iwlwifi/iwl-eeprom-parse.c
+++ b/drivers/net/wireless/intel/iwlwifi/iwl-eeprom-parse.c
@@ -766,7 +766,9 @@ void iwl_init_ht_hw_capab(const struct iwl_cfg *cfg,
         if (cfg->ht_params->ldpc)
                 ht_info->cap |= IEEE80211_HT_CAP_LDPC_CODING;
 
-        if (iwlwifi_mod_params.amsdu_size >= IWL_AMSDU_8K)
+        if ((cfg->mq_rx_supported &&
+             iwlwifi_mod_params.amsdu_size != IWL_AMSDU_4K) ||
+             iwlwifi_mod_params.amsdu_size >= IWL_AMSDU_8K)
                 ht_info->cap |= IEEE80211_HT_CAP_MAX_AMSDU;
 
         ht_info->ampdu_factor = cfg->max_ht_ampdu_exponent;
diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-modparams.h b/drivers/net/wireless/intel/iwlwifi/iwl-modparams.h
index 6c5c2f9f73a2..0379899dc847 100644
--- a/drivers/net/wireless/intel/iwlwifi/iwl-modparams.h
+++ b/drivers/net/wireless/intel/iwlwifi/iwl-modparams.h
@@ -87,9 +87,10 @@ enum iwl_disable_11n {
 };
 
 enum iwl_amsdu_size {
-        IWL_AMSDU_4K = 0,
-        IWL_AMSDU_8K = 1,
-        IWL_AMSDU_12K = 2,
+        IWL_AMSDU_DEF = 0,
+        IWL_AMSDU_4K = 1,
+        IWL_AMSDU_8K = 2,
+        IWL_AMSDU_12K = 3,
 };
 
 enum iwl_uapsd_disable {
@@ -105,7 +106,7 @@ enum iwl_uapsd_disable {
  * @sw_crypto: using hardware encryption, default = 0
  * @disable_11n: disable 11n capabilities, default = 0,
  *      use IWL_[DIS,EN]ABLE_HT_* constants
- * @amsdu_size: enable 8K amsdu size, default = 4K. enum iwl_amsdu_size.
+ * @amsdu_size: See &enum iwl_amsdu_size.
  * @restart_fw: restart firmware, default = 1
  * @bt_coex_active: enable bt coex, default = true
  * @led_mode: system default, default = 0
diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-nvm-parse.c b/drivers/net/wireless/intel/iwlwifi/iwl-nvm-parse.c
index 21653fee806c..43f8f7d45ddb 100644
--- a/drivers/net/wireless/intel/iwlwifi/iwl-nvm-parse.c
+++ b/drivers/net/wireless/intel/iwlwifi/iwl-nvm-parse.c
@@ -397,6 +397,13 @@ static void iwl_init_vht_hw_capab(const struct iwl_cfg *cfg,
                 vht_cap->cap |= IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN;
 
         switch (iwlwifi_mod_params.amsdu_size) {
+        case IWL_AMSDU_DEF:
+                if (cfg->mq_rx_supported)
+                        vht_cap->cap |=
+                                IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454;
+                else
+                        vht_cap->cap |= IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_3895;
+                break;
         case IWL_AMSDU_4K:
                 vht_cap->cap |= IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_3895;
                 break;
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
index a68054f127fa..64d2b4f04ac2 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/ops.c
@@ -603,6 +603,7 @@ iwl_op_mode_mvm_start(struct iwl_trans *trans, const struct iwl_cfg *cfg,
         trans_cfg.no_reclaim_cmds = no_reclaim_cmds;
         trans_cfg.n_no_reclaim_cmds = ARRAY_SIZE(no_reclaim_cmds);
         switch (iwlwifi_mod_params.amsdu_size) {
+        case IWL_AMSDU_DEF:
         case IWL_AMSDU_4K:
                 trans_cfg.rx_buf_size = IWL_AMSDU_4K;
                 break;
@@ -617,6 +618,10 @@ iwl_op_mode_mvm_start(struct iwl_trans *trans, const struct iwl_cfg *cfg,
                        iwlwifi_mod_params.amsdu_size);
                 trans_cfg.rx_buf_size = IWL_AMSDU_4K;
         }
+
+        /* the hardware splits the A-MSDU */
+        if (mvm->cfg->mq_rx_supported)
+                trans_cfg.rx_buf_size = IWL_AMSDU_4K;
         trans_cfg.wide_cmd_header = fw_has_api(&mvm->fw->ucode_capa,
                                                IWL_UCODE_TLV_API_WIDE_CMD_HDR);