From sgruszka@redhat.com Mon Jun 20 10:14:57 2011
From: Stanislaw Gruszka <sgruszka@redhat.com>
To: kernel@lists.fedoraproject.org
Subject: [PATCH 2.6.35 3/3] iwlagn: use cts-to-self protection on 5000 adapters series
Date: Mon, 20 Jun 2011 16:15:14 +0200
Message-Id: <1308579314-19348-4-git-send-email-sgruszka@redhat.com>
This patch fixes 802.11n stability and performance regression we have
since 2.6.35. It boost performance on my 5GHz N-only network from about
5MB/s to 8MB/s. Similar percentage boost can be observed on 2.4 GHz.
These are test results of 5x downloading of approximately 700MB iso
image:
vanilla: 5.27 5.22 4.94 4.47 5.31 ; avr 5.0420 std 0.35110
patched: 8.07 7.95 8.06 7.99 7.96 ; avr 8.0060 std 0.055946
This was achieved with NetworkManager configured to do not perform
periodical scans, by configuring constant BSSID. With periodical scans,
after some time, performance downgrade to unpatched driver level, like
in example below:
patched: 7.40 7.61 4.28 4.37 4.80 avr 5.6920 std 1.6683
However patch still make better here, since similar test on unpatched
driver make link disconnects with below messages after some time:
wlan1: authenticate with 00:23:69:35:d1:3f (try 1)
wlan1: authenticate with 00:23:69:35:d1:3f (try 2)
wlan1: authenticate with 00:23:69:35:d1:3f (try 3)
wlan1: authentication with 00:23:69:35:d1:3f timed out
On 2.6.35 kernel patch helps against connection hangs with messages:
iwlagn 0000:20:00.0: queue 10 stuck 3 time. Fw reload.
iwlagn 0000:20:00.0: On demand firmware reload
iwlagn 0000:20:00.0: Stopping AGG while state not ON or starting
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
---
drivers/net/wireless/iwlwifi/iwl-5000.c | 5 -----
drivers/net/wireless/iwlwifi/iwl-agn-hcmd.c | 11 ++---------
drivers/net/wireless/iwlwifi/iwl-agn.c | 7 +++++++
3 files changed, 9 insertions(+), 14 deletions(-)
diff --git a/drivers/net/wireless/iwlwifi/iwl-5000.c b/drivers/net/wireless/iwlwifi/iwl-5000.c
index 0a67558..8270ed6 100644
--- a/drivers/net/wireless/iwlwifi/iwl-5000.c
+++ b/drivers/net/wireless/iwlwifi/iwl-5000.c
@@ -458,7 +458,6 @@ struct iwl_cfg iwl5300_agn_cfg = {
.use_bsm = false,
.ht_greenfield_support = true,
.led_compensation = 51,
- .use_rts_for_ht = true, /* use rts/cts protection */
.chain_noise_num_beacons = IWL_CAL_NUM_BEACONS,
.plcp_delta_threshold = IWL_MAX_PLCP_ERR_LONG_THRESHOLD_DEF,
.chain_noise_scale = 1000,
@@ -489,7 +488,6 @@ struct iwl_cfg iwl5100_bgn_cfg = {
.use_bsm = false,
.ht_greenfield_support = true,
.led_compensation = 51,
- .use_rts_for_ht = true, /* use rts/cts protection */
.chain_noise_num_beacons = IWL_CAL_NUM_BEACONS,
.plcp_delta_threshold = IWL_MAX_PLCP_ERR_LONG_THRESHOLD_DEF,
.chain_noise_scale = 1000,
@@ -549,7 +547,6 @@ struct iwl_cfg iwl5100_agn_cfg = {
.use_bsm = false,
.ht_greenfield_support = true,
.led_compensation = 51,
- .use_rts_for_ht = true, /* use rts/cts protection */
.chain_noise_num_beacons = IWL_CAL_NUM_BEACONS,
.plcp_delta_threshold = IWL_MAX_PLCP_ERR_LONG_THRESHOLD_DEF,
.chain_noise_scale = 1000,
@@ -580,7 +577,6 @@ struct iwl_cfg iwl5350_agn_cfg = {
.use_bsm = false,
.ht_greenfield_support = true,
.led_compensation = 51,
- .use_rts_for_ht = true, /* use rts/cts protection */
.chain_noise_num_beacons = IWL_CAL_NUM_BEACONS,
.plcp_delta_threshold = IWL_MAX_PLCP_ERR_LONG_THRESHOLD_DEF,
.chain_noise_scale = 1000,
@@ -611,7 +607,6 @@ struct iwl_cfg iwl5150_agn_cfg = {
.use_bsm = false,
.ht_greenfield_support = true,
.led_compensation = 51,
- .use_rts_for_ht = true, /* use rts/cts protection */
.chain_noise_num_beacons = IWL_CAL_NUM_BEACONS,
.plcp_delta_threshold = IWL_MAX_PLCP_ERR_LONG_THRESHOLD_DEF,
.chain_noise_scale = 1000,
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-hcmd.c b/drivers/net/wireless/iwlwifi/iwl-agn-hcmd.c
index 2a30397..44e91af 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-hcmd.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-hcmd.c
@@ -214,16 +214,9 @@ static void iwlagn_rts_tx_cmd_flag(struct iwl_priv *priv,
__le16 fc, __le32 *tx_flags)
{
if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS ||
- info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
+ info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT ||
+ info->flags & IEEE80211_TX_CTL_AMPDU)
*tx_flags |= TX_CMD_FLG_RTS_CTS_MSK;
- return;
- }
-
- if (priv->cfg->use_rts_for_ht &&
- info->flags & IEEE80211_TX_CTL_AMPDU) {
- *tx_flags |= TX_CMD_FLG_RTS_CTS_MSK;
- return;
- }
}
/* Calc max signal level (dBm) among 3 possible receivers */
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index 6bd11c7..20ffe4b 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -103,6 +103,13 @@ int iwl_commit_rxon(struct iwl_priv *priv)
if (!iwl_is_alive(priv))
return -EBUSY;
+ /*
+ * force CTS-to-self frames protection if RTS-CTS is not preferred
+ * one aggregation protection method
+ */
+ if (!priv->cfg->use_rts_for_ht)
+ priv->staging_rxon.flags |= RXON_FLG_SELF_CTS_EN;
+
/* always get timestamp with Rx frame */
priv->staging_rxon.flags |= RXON_FLG_TSF2HOST_MSK;
--
1.7.1