mac80211: Send the management frame at requested rate

Whenever the scan request or tx_mgmt is requesting not to
use CCK rate for managemet frames through
NL80211_ATTR_TX_NO_CCK_RATE attribute, then mac80211 should
select appropriate least non-CCK rate. This could help to
send P2P probes and P2P action frames at non 11b rates
without diabling 11b rates globally.

Cc: Jouni Malinen <jouni@qca.qualcomm.com>
Signed-off-by: Rajkumar Manoharan <rmanohar@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 90dfcc9..1e83afa 100644 (file)
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -363,6 +363,9 @@ struct ieee80211_bss_conf {
  * @IEEE80211_TX_INTFL_TKIP_MIC_FAILURE: Marks this packet to be used for TKIP
  *     testing. It will be sent out with incorrect Michael MIC key to allow
  *     TKIP countermeasures to be tested.
+ * @IEEE80211_TX_CTL_NO_CCK_RATE: This frame will be sent at non CCK rate.
+ *     This flag is actually used for management frame especially for P2P
+ *     frames not being sent at CCK rate in 2GHz band.
  *
  * Note: If you have to add new flags to the enumeration, then don't
  *      forget to update %IEEE80211_TX_TEMPORARY_FLAGS when necessary.
@@ -393,6 +396,7 @@ enum mac80211_tx_control_flags {
        IEEE80211_TX_CTL_STBC                   = BIT(23) | BIT(24),
        IEEE80211_TX_CTL_TX_OFFCHAN             = BIT(25),
        IEEE80211_TX_INTFL_TKIP_MIC_FAILURE     = BIT(26),
+       IEEE80211_TX_CTL_NO_CCK_RATE            = BIT(27),
 };
 
 #define IEEE80211_TX_CTL_STBC_SHIFT            23

diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 9cba010..56c3504 100644 (file)
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -1897,6 +1897,9 @@ static int ieee80211_mgmt_tx(struct wiphy *wiphy, struct net_device *dev,
                flags |= IEEE80211_TX_CTL_TX_OFFCHAN;
        }
 
+       if (no_cck)
+               flags |= IEEE80211_TX_CTL_NO_CCK_RATE;
+
        if (is_offchan && !offchan)
                return -EBUSY;
 

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 21186e2..4822d69 100644 (file)
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1324,7 +1324,7 @@ struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
                              const u8 *ssid, size_t ssid_len,
                              const u8 *ie, size_t ie_len,
-                             u32 ratemask, bool directed);
+                             u32 ratemask, bool directed, bool no_cck);
 
 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
                                  const size_t supp_rates_len,

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 1a59fb6..cc80d32 100644 (file)
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -1239,7 +1239,7 @@ static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
        } else {
                ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
                ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0,
-                                        (u32) -1, true);
+                                        (u32) -1, true, false);
        }
 
        ifmgd->probe_send_count++;

diff --git a/net/mac80211/rate.c b/net/mac80211/rate.c
index 3d5a2cb..f61244c 100644 (file)
--- a/net/mac80211/rate.c
+++ b/net/mac80211/rate.c
@@ -233,6 +233,27 @@ static void rc_send_low_broadcast(s8 *idx, u32 basic_rates,
        /* could not find a basic rate; use original selection */
 }
 
+static inline s8
+rate_lowest_non_cck_index(struct ieee80211_supported_band *sband,
+                         struct ieee80211_sta *sta)
+{
+       int i;
+
+       for (i = 0; i < sband->n_bitrates; i++) {
+               struct ieee80211_rate *srate = &sband->bitrates[i];
+               if ((srate->bitrate == 10) || (srate->bitrate == 20) ||
+                   (srate->bitrate == 55) || (srate->bitrate == 110))
+                       continue;
+
+               if (rate_supported(sta, sband->band, i))
+                       return i;
+       }
+
+       /* No matching rate found */
+       return 0;
+}
+
+
 bool rate_control_send_low(struct ieee80211_sta *sta,
                           void *priv_sta,
                           struct ieee80211_tx_rate_control *txrc)
@@ -242,7 +263,13 @@ bool rate_control_send_low(struct ieee80211_sta *sta,
        int mcast_rate;
 
        if (!sta || !priv_sta || rc_no_data_or_no_ack(txrc)) {
-               info->control.rates[0].idx = rate_lowest_index(txrc->sband, sta);
+               if ((sband->band != IEEE80211_BAND_2GHZ) ||
+                   !(info->flags & IEEE80211_TX_CTL_NO_CCK_RATE))
+                       info->control.rates[0].idx =
+                               rate_lowest_index(txrc->sband, sta);
+               else
+                       info->control.rates[0].idx =
+                               rate_lowest_non_cck_index(txrc->sband, sta);
                info->control.rates[0].count =
                        (info->flags & IEEE80211_TX_CTL_NO_ACK) ?
                        1 : txrc->hw->max_rate_tries;

diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index 6f09eca..830e60f 100644 (file)
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -660,7 +660,8 @@ static void ieee80211_scan_state_send_probe(struct ieee80211_local *local,
                        local->scan_req->ssids[i].ssid,
                        local->scan_req->ssids[i].ssid_len,
                        local->scan_req->ie, local->scan_req->ie_len,
-                       local->scan_req->rates[band], false);
+                       local->scan_req->rates[band], false,
+                       local->scan_req->no_cck);
 
        /*
         * After sending probe requests, wait for probe responses

diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 4b1466d..ead345d 100644 (file)
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -899,14 +899,18 @@ struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
                              const u8 *ssid, size_t ssid_len,
                              const u8 *ie, size_t ie_len,
-                             u32 ratemask, bool directed)
+                             u32 ratemask, bool directed, bool no_cck)
 {
        struct sk_buff *skb;
 
        skb = ieee80211_build_probe_req(sdata, dst, ratemask, ssid, ssid_len,
                                        ie, ie_len, directed);
-       if (skb)
+       if (skb) {
+               if (no_cck)
+                       IEEE80211_SKB_CB(skb)->flags |=
+                               IEEE80211_TX_CTL_NO_CCK_RATE;
                ieee80211_tx_skb(sdata, skb);
+       }
 }
 
 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,

diff --git a/net/mac80211/work.c b/net/mac80211/work.c
index bac3439..af374fa 100644 (file)
--- a/net/mac80211/work.c
+++ b/net/mac80211/work.c
@@ -458,7 +458,7 @@ ieee80211_direct_probe(struct ieee80211_work *wk)
         */
        ieee80211_send_probe_req(sdata, NULL, wk->probe_auth.ssid,
                                 wk->probe_auth.ssid_len, NULL, 0,
-                                (u32) -1, true);
+                                (u32) -1, true, false);
 
        wk->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
        run_again(local, wk->timeout);