iwlwifi: Use RTS/CTS as the preferred protection mechanism for 6000 series

commit 73871f7181a1406c67e93c8c83f5edb26057a2a6 upstream

When 802.11g was introduced, we had RTS/CTS and CTS-to-Self protection
mechanisms. In an HT Beacon, HT stations use the "Operating Mode" field
in the HT Information Element to determine whether or not to use
protection.

The Operating Mode field has 4 possible settings: 0-3:
Mode 0: If all stations in the BSS are 20/40 MHz HT capable, or if the
BSS is 20/40 MHz capable, or if all stations in the BSS are 20 MHz HT
stations in a 20 MHz BSS
Mode 1: used if there are non-HT stations or APs using the primary or
secondary channels
Mode 2: if only HT stations are associated in the BSS and at least one
20 MHz HT station is associated.
Mode 3: used if one or more non-HT stations are associated in the BSS.

When in operating modes 1 or 3, and the Use_Protection field is 1 in the
Beacon's ERP IE, all HT transmissions must be protected using RTS/CTS or
CTS-to-Self.

By default, CTS-to-self is the preferred protection mechanism for less
overhead and higher throughput; but using the full RTS/CTS will better
protect the inner exchange from interference, especially in
highly-congested environment.

For 6000 series WIFI NIC, RTS/CTS protection mechanism is the
recommended choice for HT traffic based on the HW design.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/net/wireless/iwlwifi/iwl-6000.c b/drivers/net/wireless/iwlwifi/iwl-6000.c
index e4a405f4ee1601f4147f44dfa01c5a55dd902dc8..ee7b48ed3e8be5afc931873764d6a518beeffbee 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-6000.c
+++ b/drivers/net/wireless/iwlwifi/iwl-6000.c
@@ -109,6 +109,7 @@ struct iwl_cfg iwl6000_2agn_cfg = {
        .need_pll_cfg = false,
        .max_ll_items = OTP_MAX_LL_ITEMS_6x00,
        .shadow_ram_support = true,
+       .use_rts_for_ht = true, /* use rts/cts protection */
 };
 
 struct iwl_cfg iwl6050_2agn_cfg = {
@@ -127,6 +128,7 @@ struct iwl_cfg iwl6050_2agn_cfg = {
        .need_pll_cfg = false,
        .max_ll_items = OTP_MAX_LL_ITEMS_6x00,
        .shadow_ram_support = true,
+       .use_rts_for_ht = true, /* use rts/cts protection */
 };
 
 struct iwl_cfg iwl6000_3agn_cfg = {
@@ -145,6 +147,7 @@ struct iwl_cfg iwl6000_3agn_cfg = {
        .need_pll_cfg = false,
        .max_ll_items = OTP_MAX_LL_ITEMS_6x00,
        .shadow_ram_support = true,
+       .use_rts_for_ht = true, /* use rts/cts protection */
 };
 
 struct iwl_cfg iwl6050_3agn_cfg = {
@@ -163,6 +166,7 @@ struct iwl_cfg iwl6050_3agn_cfg = {
        .need_pll_cfg = false,
        .max_ll_items = OTP_MAX_LL_ITEMS_6x00,
        .shadow_ram_support = true,
+       .use_rts_for_ht = true, /* use rts/cts protection */
 };
 
 MODULE_FIRMWARE(IWL6000_MODULE_FIRMWARE(IWL6000_UCODE_API_MAX));

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-rs.c b/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
index ff20e5048a556311fd7550b1e244486e1807cb6f..f5c108be541c383d3d1822a7fa59175e792b9da0 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-rs.c
@@ -415,6 +415,15 @@ static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
        else if (tid == IWL_AGG_ALL_TID)
                for (tid = 0; tid < TID_MAX_LOAD_COUNT; tid++)
                        rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
+       if (priv->cfg->use_rts_for_ht) {
+               /*
+                * switch to RTS/CTS if it is the prefer protection method
+                * for HT traffic
+                */
+               IWL_DEBUG_HT(priv, "use RTS/CTS protection for HT\n");
+               priv->staging_rxon.flags &= ~RXON_FLG_SELF_CTS_EN;
+               iwlcore_commit_rxon(priv);
+       }
 }
 
 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index 2a577ae8fcdaf5ab412536731ace829eea1c1047..fc33b29c58ae69984a37f9b9a8d2b569cc5d9e41 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -115,9 +115,6 @@ int iwl_commit_rxon(struct iwl_priv *priv)
 
        /* always get timestamp with Rx frame */
        priv->staging_rxon.flags |= RXON_FLG_TSF2HOST_MSK;
-       /* allow CTS-to-self if possible. this is relevant only for
-        * 5000, but will not damage 4965 */
-       priv->staging_rxon.flags |= RXON_FLG_SELF_CTS_EN;
 
        ret = iwl_check_rxon_cmd(priv);
        if (ret) {
@@ -217,6 +214,13 @@ int iwl_commit_rxon(struct iwl_priv *priv)
                                        "Could not send WEP static key.\n");
                }
 
+               /*
+                * allow CTS-to-self if possible for new association.
+                * this is relevant only for 5000 series and up,
+                * but will not damage 4965
+                */
+               priv->staging_rxon.flags |= RXON_FLG_SELF_CTS_EN;
+
                /* Apply the new configuration
                 * RXON assoc doesn't clear the station table in uCode,
                 */

diff --git a/drivers/net/wireless/iwlwifi/iwl-core.h b/drivers/net/wireless/iwlwifi/iwl-core.h
index 1e518913f93a5619f378f3a3371efeb9b8ac599b..4e616eccebfb9cd7bf92880371b6d5b9719d7e98 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-core.h
+++ b/drivers/net/wireless/iwlwifi/iwl-core.h
@@ -209,6 +209,7 @@ struct iwl_mod_params {
  * @ucode_api_min: Lowest version of uCode API supported by driver.
  * @max_ll_items: max number of OTP blocks
  * @shadow_ram_support: shadow support for OTP memory
+ * @use_rts_for_ht: use rts/cts protection for HT traffic
  *
  * We enable the driver to be backward compatible wrt API version. The
  * driver specifies which APIs it supports (with @ucode_api_max being the
@@ -247,6 +248,7 @@ struct iwl_cfg {
        bool use_isr_legacy;
        const u16 max_ll_items;
        const bool shadow_ram_support;
+       bool use_rts_for_ht;
 };
 
 /***************************