mac80211: add block ack request capability

This patch adds block ack request capability

Signed-off-by: Ester Kummer <ester.kummer@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Ron Rindjunsky <ron.rindjunsky@intel.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 86abdf96390c..e080482b63cd 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -1536,6 +1536,35 @@ void ieee80211_send_delba(struct net_device *dev, const u8 *da, u16 tid,
         ieee80211_sta_tx(dev, skb, 0);
 }
 
+void ieee80211_send_bar(struct net_device *dev, u8 *ra, u16 tid, u16 ssn)
+{
+        struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
+        struct sk_buff *skb;
+        struct ieee80211_bar *bar;
+        u16 bar_control = 0;
+
+        skb = dev_alloc_skb(sizeof(*bar) + local->hw.extra_tx_headroom);
+        if (!skb) {
+                printk(KERN_ERR "%s: failed to allocate buffer for "
+                        "bar frame\n", dev->name);
+                return;
+        }
+        skb_reserve(skb, local->hw.extra_tx_headroom);
+        bar = (struct ieee80211_bar *)skb_put(skb, sizeof(*bar));
+        memset(bar, 0, sizeof(*bar));
+        bar->frame_control = IEEE80211_FC(IEEE80211_FTYPE_CTL,
+                                        IEEE80211_STYPE_BACK_REQ);
+        memcpy(bar->ra, ra, ETH_ALEN);
+        memcpy(bar->ta, dev->dev_addr, ETH_ALEN);
+        bar_control |= (u16)IEEE80211_BAR_CTRL_ACK_POLICY_NORMAL;
+        bar_control |= (u16)IEEE80211_BAR_CTRL_CBMTID_COMPRESSED_BA;
+        bar_control |= (u16)(tid << 12);
+        bar->control = cpu_to_le16(bar_control);
+        bar->start_seq_num = cpu_to_le16(ssn);
+
+        ieee80211_sta_tx(dev, skb, 0);
+}
+
 void ieee80211_sta_stop_rx_ba_session(struct net_device *dev, u8 *ra, u16 tid,
                                         u16 initiator, u16 reason)
 {