[PATCH] mac80211: Implementation of SIOCSIWRATE

The WEXT ioctl SIOCSIWRATE is not implemented in mac80211. This patch
adds the missing routine. It supports the 'auto' keyword, fixed rates,
and the combination of 'auto' and a fixed rate to select an upper bound.

Based on the patch from Mohamed Abbas <mabbas@linux.intel.com>.
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Jiri Benc <jbenc@suse.cz>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/ieee80211_ioctl.c

@@ -863,6 +863,44 @@ static int ieee80211_ioctl_giwscan(struct net_device *dev,
 }
 
 
+static int ieee80211_ioctl_siwrate(struct net_device *dev,
+				  struct iw_request_info *info,
+				  struct iw_param *rate, char *extra)
+{
+	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
+	struct ieee80211_hw_mode *mode;
+	int i;
+	u32 target_rate = rate->value / 100000;
+	struct ieee80211_sub_if_data *sdata;
+
+	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+	if (!sdata->bss)
+		return -ENODEV;
+	mode = local->oper_hw_mode;
+	/* target_rate = -1, rate->fixed = 0 means auto only, so use all rates
+	 * target_rate = X, rate->fixed = 1 means only rate X
+	 * target_rate = X, rate->fixed = 0 means all rates <= X */
+	sdata->bss->max_ratectrl_rateidx = -1;
+	sdata->bss->force_unicast_rateidx = -1;
+	if (rate->value < 0)
+		return 0;
+	for (i=0; i< mode->num_rates; i++) {
+		struct ieee80211_rate *rates = &mode->rates[i];
+		int this_rate = rates->rate;
+
+		if (mode->mode == MODE_ATHEROS_TURBO ||
+		    mode->mode == MODE_ATHEROS_TURBOG)
+			this_rate *= 2;
+		if (target_rate == this_rate) {
+			sdata->bss->max_ratectrl_rateidx = i;
+			if (rate->fixed)
+				sdata->bss->force_unicast_rateidx = i;
+			break;
+		}
+	}
+	return 0;
+}
+
 static int ieee80211_ioctl_giwrate(struct net_device *dev,
 				  struct iw_request_info *info,
 				  struct iw_param *rate, char *extra)
@@ -1658,7 +1696,7 @@ static const iw_handler ieee80211_handler[] =
 	(iw_handler) NULL,				/* SIOCGIWNICKN */
 	(iw_handler) NULL,				/* -- hole -- */
 	(iw_handler) NULL,				/* -- hole -- */
-	(iw_handler) NULL,				/* SIOCSIWRATE */
+	(iw_handler) ieee80211_ioctl_siwrate,		/* SIOCSIWRATE */
 	(iw_handler) ieee80211_ioctl_giwrate,		/* SIOCGIWRATE */
 	(iw_handler) ieee80211_ioctl_siwrts,		/* SIOCSIWRTS */
 	(iw_handler) ieee80211_ioctl_giwrts,		/* SIOCGIWRTS */