carl9170: configurable beacon rates

Previously, the beacon rate was fixed to either:
 * 1Mb/s [2.4GHz band]
 * 6Mb/s [5GHz band]

This limitation has been addressed and now the
beacon rate is selected by ieee80211_tx_info's
rate control info, almost like any ordinary
data frame.

Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 32 insertions, 20 deletions

diff --git a/drivers/net/wireless/ath/carl9170/mac.c b/drivers/net/wireless/ath/carl9170/mac.c
index c34eeeeb8af3..385cf508479b 100644
--- a/drivers/net/wireless/ath/carl9170/mac.c
+++ b/drivers/net/wireless/ath/carl9170/mac.c
@@ -457,8 +457,9 @@ int carl9170_set_beacon_timers(struct ar9170 *ar)
 
 int carl9170_update_beacon(struct ar9170 *ar, const bool submit)
 {
-        struct sk_buff *skb;
+        struct sk_buff *skb = NULL;
         struct carl9170_vif_info *cvif;
+        struct ieee80211_tx_info *txinfo;
         __le32 *data, *old = NULL;
         u32 word, off, addr, len;
         int i = 0, err = 0;
@@ -487,7 +488,13 @@ found:
 
         if (!skb) {
                 err = -ENOMEM;
-                goto out_unlock;
+                goto err_free;
+        }
+
+        txinfo = IEEE80211_SKB_CB(skb);
+        if (txinfo->control.rates[0].flags & IEEE80211_TX_RC_MCS) {
+                err = -EINVAL;
+                goto err_free;
         }
 
         spin_lock_bh(&ar->beacon_lock);
@@ -504,11 +511,8 @@ found:
                         wiphy_err(ar->hw->wiphy, "beacon does not "
                                   "fit into device memory!\n");
                 }
-
-                spin_unlock_bh(&ar->beacon_lock);
-                dev_kfree_skb_any(skb);
                 err = -EINVAL;
-                goto out_unlock;
+                goto err_unlock;
         }
 
         if (len > AR9170_MAC_BCN_LENGTH_MAX) {
@@ -518,22 +522,22 @@ found:
                                  AR9170_MAC_BCN_LENGTH_MAX, len);
                 }
 
-                spin_unlock_bh(&ar->beacon_lock);
-                dev_kfree_skb_any(skb);
                 err = -EMSGSIZE;
-                goto out_unlock;
+                goto err_unlock;
         }
 
-        carl9170_async_regwrite_begin(ar);
+        i = txinfo->control.rates[0].idx;
+        if (txinfo->band != IEEE80211_BAND_2GHZ)
+                i += 4;
 
-        /* XXX: use skb->cb info */
-        if (ar->hw->conf.channel->band == IEEE80211_BAND_2GHZ) {
-                carl9170_async_regwrite(AR9170_MAC_REG_BCN_PLCP,
-                                ((skb->len + FCS_LEN) << (3 + 16)) + 0x0400);
-        } else {
-                carl9170_async_regwrite(AR9170_MAC_REG_BCN_PLCP,
-                                ((skb->len + FCS_LEN) << 16) + 0x001b);
-        }
+        word = __carl9170_ratetable[i].hw_value & 0xf;
+        if (i < 4)
+                word |= ((skb->len + FCS_LEN) << (3 + 16)) + 0x0400;
+        else
+                word |= ((skb->len + FCS_LEN) << 16) + 0x0010;
+
+        carl9170_async_regwrite_begin(ar);
+        carl9170_async_regwrite(AR9170_MAC_REG_BCN_PLCP, word);
 
         for (i = 0; i < DIV_ROUND_UP(skb->len, 4); i++) {
                 /*
@@ -557,7 +561,7 @@ found:
                 cvif->beacon = skb;
         spin_unlock_bh(&ar->beacon_lock);
         if (err)
-                goto out_unlock;
+                goto err_free;
 
         if (submit) {
                 err = carl9170_bcn_ctrl(ar, cvif->id,
@@ -565,10 +569,18 @@ found:
                                         addr, skb->len + FCS_LEN);
 
                 if (err)
-                        goto out_unlock;
+                        goto err_free;
         }
 out_unlock:
         rcu_read_unlock();
+        return 0;
+
+err_unlock:
+        spin_unlock_bh(&ar->beacon_lock);
+
+err_free:
+        rcu_read_unlock();
+        dev_kfree_skb_any(skb);
         return err;
 }