ath9k: add LDPC support

LDPC is enabled by the rate control if the its determined
that the target peer supports LDPC. We would have already
intersected the HT capabilities so if our peer supports
LDPC so do we.

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 10 insertions, 4 deletions

diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c
index c2b45030d0b4..90e629f276f3 100644
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -1483,8 +1483,7 @@ static void assign_aggr_tid_seqno(struct sk_buff *skb,
         INCR(tid->seq_next, IEEE80211_SEQ_MAX);
 }
 
-static int setup_tx_flags(struct ath_softc *sc, struct sk_buff *skb,
-                          struct ath_txq *txq)
+static int setup_tx_flags(struct sk_buff *skb, bool use_ldpc)
 {
         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
         int flags = 0;
@@ -1495,6 +1494,9 @@ static int setup_tx_flags(struct ath_softc *sc, struct sk_buff *skb,
         if (tx_info->flags & IEEE80211_TX_CTL_NO_ACK)
                 flags |= ATH9K_TXDESC_NOACK;
 
+        if (use_ldpc)
+                flags |= ATH9K_TXDESC_LDPC;
+
         return flags;
 }
 
@@ -1646,6 +1648,7 @@ static int ath_tx_setup_buffer(struct ieee80211_hw *hw, struct ath_buf *bf,
         int hdrlen;
         __le16 fc;
         int padpos, padsize;
+        bool use_ldpc = false;
 
         tx_info->pad[0] = 0;
         switch (txctl->frame_type) {
@@ -1672,10 +1675,13 @@ static int ath_tx_setup_buffer(struct ieee80211_hw *hw, struct ath_buf *bf,
                 bf->bf_frmlen -= padsize;
         }
 
-        if (conf_is_ht(&hw->conf))
+        if (conf_is_ht(&hw->conf)) {
                 bf->bf_state.bf_type |= BUF_HT;
+                if (tx_info->flags & IEEE80211_TX_CTL_LDPC)
+                        use_ldpc = true;
+        }
 
-        bf->bf_flags = setup_tx_flags(sc, skb, txctl->txq);
+        bf->bf_flags = setup_tx_flags(skb, use_ldpc);
 
         bf->bf_keytype = get_hw_crypto_keytype(skb);
         if (bf->bf_keytype != ATH9K_KEY_TYPE_CLEAR) {