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authorStanislaw Gruszka <sgruszka@redhat.com>2011-05-26 17:14:22 +0200
committerJohn W. Linville <linville@tuxdriver.com>2011-06-06 15:24:17 -0400
commit42b70a5f6d18165a075d189d1bee82fad7cdbf29 (patch)
tree9e838406cc393e95d36091db7a997162b1f8a47b /drivers/net
parentab6a44ce1da48d35fe7ec95fa068aa617bd7e8dd (diff)
downloadop-kernel-dev-42b70a5f6d18165a075d189d1bee82fad7cdbf29.zip
op-kernel-dev-42b70a5f6d18165a075d189d1bee82fad7cdbf29.tar.gz
iwlagn: use cts-to-self protection on 5000 adapters series
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 Cc: stable@kernel.org # 2.6.35+ Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com> Acked-by: Wey-Yi Guy <wey-yi.w.guy@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/wireless/iwlwifi/iwl-5000.c1
-rw-r--r--drivers/net/wireless/iwlwifi/iwl-agn-hcmd.c12
-rw-r--r--drivers/net/wireless/iwlwifi/iwl-agn-rxon.c8
3 files changed, 10 insertions, 11 deletions
diff --git a/drivers/net/wireless/iwlwifi/iwl-5000.c b/drivers/net/wireless/iwlwifi/iwl-5000.c
index 5b721c5..f99f9c1 100644
--- a/drivers/net/wireless/iwlwifi/iwl-5000.c
+++ b/drivers/net/wireless/iwlwifi/iwl-5000.c
@@ -423,7 +423,6 @@ static struct iwl_base_params iwl5000_base_params = {
};
static struct iwl_ht_params iwl5000_ht_params = {
.ht_greenfield_support = true,
- .use_rts_for_aggregation = true, /* use rts/cts protection */
};
#define IWL_DEVICE_5000 \
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-hcmd.c b/drivers/net/wireless/iwlwifi/iwl-agn-hcmd.c
index b12c72d..23fa93d 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-hcmd.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-hcmd.c
@@ -163,17 +163,9 @@ static void iwlagn_tx_cmd_protection(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_PROT_REQUIRE_MSK;
- return;
- }
-
- if (priv->cfg->ht_params &&
- priv->cfg->ht_params->use_rts_for_aggregation &&
- info->flags & IEEE80211_TX_CTL_AMPDU) {
- *tx_flags |= TX_CMD_FLG_PROT_REQUIRE_MSK;
- return;
- }
}
/* Calc max signal level (dBm) among 3 possible receivers */
diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-rxon.c b/drivers/net/wireless/iwlwifi/iwl-agn-rxon.c
index 2532c7d..0188749 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn-rxon.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-rxon.c
@@ -325,6 +325,14 @@ int iwlagn_commit_rxon(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
return 0;
}
+ /*
+ * force CTS-to-self frames protection if RTS-CTS is not preferred
+ * one aggregation protection method
+ */
+ if (!(priv->cfg->ht_params &&
+ priv->cfg->ht_params->use_rts_for_aggregation))
+ ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
+
if ((ctx->vif && ctx->vif->bss_conf.use_short_slot) ||
!(ctx->staging.flags & RXON_FLG_BAND_24G_MSK))
ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
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