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iwlwifi: mvm: disable tx aggregation on low latency vifs

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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 <eyalx.shapira@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
This commit is contained in:
Eyal Shapira 2014-08-28 02:21:05 +03:00 committed by Emmanuel Grumbach
parent bdd5483958
commit 9ecd051ecd
4 changed files with 14 additions and 1 deletions
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4
drivers/net/wireless/iwlwifi/mvm/debugfs.c
View file

@ -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;

2
drivers/net/wireless/iwlwifi/mvm/mvm.h
View file

@ -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 */

1
drivers/net/wireless/iwlwifi/mvm/ops.c
View file

@ -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);

8
drivers/net/wireless/iwlwifi/mvm/rs.c
View file

@ -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;