From adcf2af91600e6391a0da37af8eab9b8fbd2776f Mon Sep 17 00:00:00 2001 From: Eyal Shapira Date: Thu, 28 Aug 2014 02:21:05 +0300 Subject: [PATCH] iwlwifi: mvm: disable tx aggregation on low latency vifs Aggregations hit latency so disable it by default on low latency vifs for now. Enable control over this behavior and allow control over the max frames in an AMPDU in low latency vifs via debugfs. Signed-off-by: Eyal Shapira Reviewed-by: Johannes Berg Signed-off-by: Emmanuel Grumbach --- drivers/net/wireless/iwlwifi/mvm/debugfs.c | 4 ++++ drivers/net/wireless/iwlwifi/mvm/mvm.h | 2 ++ drivers/net/wireless/iwlwifi/mvm/ops.c | 1 + drivers/net/wireless/iwlwifi/mvm/rs.c | 8 +++++++- 4 files changed, 14 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/iwlwifi/mvm/debugfs.c b/drivers/net/wireless/iwlwifi/mvm/debugfs.c index 1fcbc23678c43..f85d4f4519f6a 100644 --- a/drivers/net/wireless/iwlwifi/mvm/debugfs.c +++ b/drivers/net/wireless/iwlwifi/mvm/debugfs.c @@ -1447,6 +1447,10 @@ int iwl_mvm_dbgfs_register(struct iwl_mvm *mvm, struct dentry *dbgfs_dir) goto err; #endif + if (!debugfs_create_u8("low_latency_agg_frame_limit", S_IRUSR | S_IWUSR, + mvm->debugfs_dir, + &mvm->low_latency_agg_frame_limit)) + goto err; if (!debugfs_create_u8("ps_disabled", S_IRUSR, mvm->debugfs_dir, &mvm->ps_disabled)) goto err; diff --git a/drivers/net/wireless/iwlwifi/mvm/mvm.h b/drivers/net/wireless/iwlwifi/mvm/mvm.h index d6b00b97ae66b..08cb26d86be26 100644 --- a/drivers/net/wireless/iwlwifi/mvm/mvm.h +++ b/drivers/net/wireless/iwlwifi/mvm/mvm.h @@ -727,6 +727,8 @@ struct iwl_mvm { /* system time of last beacon (for AP/GO interface) */ u32 ap_last_beacon_gp2; + + u8 low_latency_agg_frame_limit; }; /* Extract MVM priv from op_mode and _hw */ diff --git a/drivers/net/wireless/iwlwifi/mvm/ops.c b/drivers/net/wireless/iwlwifi/mvm/ops.c index 610dbcb0dc279..e3be34f6aa415 100644 --- a/drivers/net/wireless/iwlwifi/mvm/ops.c +++ b/drivers/net/wireless/iwlwifi/mvm/ops.c @@ -415,6 +415,7 @@ iwl_op_mode_mvm_start(struct iwl_trans *trans, const struct iwl_cfg *cfg, mvm->first_agg_queue = 12; } mvm->sf_state = SF_UNINIT; + mvm->low_latency_agg_frame_limit = 1; mutex_init(&mvm->mutex); mutex_init(&mvm->d0i3_suspend_mutex); diff --git a/drivers/net/wireless/iwlwifi/mvm/rs.c b/drivers/net/wireless/iwlwifi/mvm/rs.c index b7a1efcac4805..940e0d0250126 100644 --- a/drivers/net/wireless/iwlwifi/mvm/rs.c +++ b/drivers/net/wireless/iwlwifi/mvm/rs.c @@ -2855,9 +2855,15 @@ static void rs_fill_lq_cmd(struct iwl_mvm *mvm, * Tx Fifo so that it can start a transaction in the same TxOP. This * basically allows the firmware to send bursts. */ - if (iwl_mvm_vif_low_latency(mvmvif)) + if (iwl_mvm_vif_low_latency(mvmvif)) { lq_cmd->agg_frame_cnt_limit--; + if (mvm->low_latency_agg_frame_limit) + lq_cmd->agg_frame_cnt_limit = + min(lq_cmd->agg_frame_cnt_limit, + mvm->low_latency_agg_frame_limit); + } + if (mvmsta->vif->p2p) lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK; -- 2.39.5