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authorLuis R. Rodriguez <lrodriguez@atheros.com>2009-07-16 10:05:41 -0700
committerJohn W. Linville <linville@tuxdriver.com>2009-07-24 15:05:16 -0400
commit4c6d4f5c33fbe19b134c1af43af166fee79eb986 (patch)
tree789bd7f9c049ea9c57ad8f4826df6bcad3774ade /net/mac80211/rate.c
parent943ab70f6aebfdc0005ef7e58ae982e9ec22224b (diff)
downloadlinux-next-4c6d4f5c33fbe19b134c1af43af166fee79eb986.tar.gz
mac80211: add helper for management / no-ack frame rate decision
All current rate control algorithms agree to send management and no-ack frames at the lowest rate. They also agree to do this when sta and the private rate control data is NULL. We add a hlper to mac80211 for this and simplify the rate control algorithm code. Developers wishing to make enhancements to rate control algorithms are for broadcast/multicast can opt to not use this in their gate_rate() mac80211 callback. Cc: Zhu Yi <yi.zhu@intel.com> Acked-by: Reinette Chatre <reinette.chatre@intel.com> Cc: ipw3945-devel@lists.sourceforge.net Cc: Gabor Juhos <juhosg@openwrt.org> Acked-by: Felix Fietkau <nbd@openwrt.org> Cc: Derek Smithies <derek@indranet.co.nz> Cc: Chittajit Mitra <Chittajit.Mitra@Atheros.com> Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/rate.c')
-rw-r--r--net/mac80211/rate.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/net/mac80211/rate.c b/net/mac80211/rate.c
index 4641f00a1e5c..8ac7a984d886 100644
--- a/net/mac80211/rate.c
+++ b/net/mac80211/rate.c
@@ -198,6 +198,35 @@ static void rate_control_release(struct kref *kref)
kfree(ctrl_ref);
}
+static bool rc_no_data_or_no_ack(struct ieee80211_tx_rate_control *txrc)
+{
+ struct sk_buff *skb = txrc->skb;
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ __le16 fc;
+
+ fc = hdr->frame_control;
+
+ return ((info->flags & IEEE80211_TX_CTL_NO_ACK) || !ieee80211_is_data(fc));
+}
+
+bool rate_control_send_low(struct ieee80211_sta *sta,
+ void *priv_sta,
+ struct ieee80211_tx_rate_control *txrc)
+{
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(txrc->skb);
+
+ if (!sta || !priv_sta || rc_no_data_or_no_ack(txrc)) {
+ info->control.rates[0].idx = rate_lowest_index(txrc->sband, sta);
+ info->control.rates[0].count =
+ (info->flags & IEEE80211_TX_CTL_NO_ACK) ?
+ 1 : txrc->hw->max_rate_tries;
+ return true;
+ }
+ return false;
+}
+EXPORT_SYMBOL(rate_control_send_low);
+
void rate_control_get_rate(struct ieee80211_sub_if_data *sdata,
struct sta_info *sta,
struct ieee80211_tx_rate_control *txrc)