mac80211: clean up rate selection

Move some code out of rc80211_simple since it's probably needed for all rate
selection algorithms, and fix iwlwifi accordingly. While at it, clean up the
rate_control_get_rate() interface.

Signed-off-by: Stefano Brivio <stefano.brivio@polimi.it>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 47 insertions, 0 deletions

diff --git a/net/mac80211/ieee80211_rate.c b/net/mac80211/ieee80211_rate.c
index c3f2783..e495b09 100644
--- a/net/mac80211/ieee80211_rate.c
+++ b/net/mac80211/ieee80211_rate.c
@@ -147,6 +147,53 @@ static void rate_control_release(struct kref *kref)
 	kfree(ctrl_ref);
 }
 
+void rate_control_get_rate(struct net_device *dev,
+			   struct ieee80211_hw_mode *mode, struct sk_buff *skb,
+			   struct rate_selection *sel)
+{
+	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
+	struct rate_control_ref *ref = local->rate_ctrl;
+	struct ieee80211_sub_if_data *sdata;
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+	struct sta_info *sta = sta_info_get(local, hdr->addr1);
+	int i;
+	u16 fc;
+
+	memset(sel, 0, sizeof(struct rate_selection));
+
+	/* Send management frames and broadcast/multicast data using lowest
+	 * rate. */
+	fc = le16_to_cpu(hdr->frame_control);
+	if ((fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA ||
+	    is_multicast_ether_addr(hdr->addr1))
+		sel->rate = rate_lowest(local, mode, sta);
+
+	/* If a forced rate is in effect, select it. */
+	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+	if (sdata->bss && sdata->bss->force_unicast_rateidx > -1)
+		sel->rate = &mode->rates[sdata->bss->force_unicast_rateidx];
+
+	/* If we haven't found the rate yet, ask the rate control algo. */
+	if (!sel->rate)
+		ref->ops->get_rate(ref->priv, dev, mode, skb, sel);
+
+	/* Select a non-ERP backup rate. */
+	if (!sel->nonerp) {
+		for (i = 0; i < mode->num_rates - 1; i++) {
+			struct ieee80211_rate *rate = &mode->rates[i];
+			if (sel->rate->rate < rate->rate)
+				break;
+
+			if (rate_supported(sta, mode, i) &&
+			    !(rate->flags & IEEE80211_RATE_ERP))
+				sel->nonerp = rate;
+		}
+	}
+
+	if (sta)
+		sta_info_put(sta);
+}
+
 struct rate_control_ref *rate_control_get(struct rate_control_ref *ref)
 {
 	kref_get(&ref->kref);