From: Wey-Yi Guy <wey-yi.w.guy@xxxxxxxxx> When building tx command, always set TX_CMD_FLAG_PROT_REQUIRE_MSK for 5000 series and up. Without setting this bit the firmware will not examine the RTS/CTS setting and thus not send traffic with the appropriate protection. RTS/CTS is is required for HT traffic in a noisy environment where, without this setting, connections will stall on some hardware as documented in the patch that initially attempted to address this: commit 1152dcc28c66a74b5b3f1a3ede0aa6729bfd48e4 Author: Wey-Yi Guy <wey-yi.w.guy@xxxxxxxxx> Date: Fri Jan 15 13:42:58 2010 -0800 iwlwifi: Fix throughput stall issue in HT mode for 5000 Similar to 6000 and 1000 series, RTS/CTS is the recommended protection mechanism for 5000 series in HT mode based on the HW design. Using RTS/CTS will better protect the inner exchange from interference, especially in highly-congested environment, it also prevent uCode encounter TX FIFO underrun and other HT mode related performance issues. For 3945 and 4965, different flags are used for RTS/CTS or CTS-to-Self protection. Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@xxxxxxxxx> Signed-off-by: Reinette Chatre <reinette.chatre@xxxxxxxxx> --- drivers/net/wireless/iwlwifi/iwl-agn-hcmd.c | 6 +----- 1 files changed, 1 insertions(+), 5 deletions(-) diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-hcmd.c b/drivers/net/wireless/iwlwifi/iwl-agn-hcmd.c index 44ef5d9..01658cf 100644 --- a/drivers/net/wireless/iwlwifi/iwl-agn-hcmd.c +++ b/drivers/net/wireless/iwlwifi/iwl-agn-hcmd.c @@ -212,11 +212,7 @@ static void iwlagn_chain_noise_reset(struct iwl_priv *priv) static void iwlagn_rts_tx_cmd_flag(struct ieee80211_tx_info *info, __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)) - *tx_flags |= TX_CMD_FLG_RTS_CTS_MSK; - else - *tx_flags &= ~TX_CMD_FLG_RTS_CTS_MSK; + *tx_flags |= TX_CMD_FLG_RTS_CTS_MSK; } /* Calc max signal level (dBm) among 3 possible receivers */ -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html