madwifi: add an optional threshold for low-rssi disconnection. This can be useful when letting wpa_supplicant control roaming.

SVN-Revision: 11799

package/madwifi/patches/362-rssithr.patch

@@ -0,0 +1,91 @@
+Add an optional threshold for low-rssi disconnection. This can be useful
+when letting wpa_supplicant control roaming.
+
+Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+
+--- a/net80211/ieee80211_ioctl.h
++++ b/net80211/ieee80211_ioctl.h
+@@ -647,6 +647,8 @@
+ 	IEEE80211_PARAM_PROTMODE_RSSI		= 77,	/* RSSI Threshold for enabling protection mode */
+ 	IEEE80211_PARAM_PROTMODE_TIMEOUT	= 78,	/* Timeout for expiring protection mode */
+ 	IEEE80211_PARAM_BGSCAN_THRESH		= 79,	/* bg scan rssi threshold */
++	IEEE80211_PARAM_RSSI_DIS_THR	= 80,	/* rssi threshold for disconnection */
++	IEEE80211_PARAM_RSSI_DIS_COUNT	= 81,	/* counter for rssi threshold */
+ };
+ 
+ #define	SIOCG80211STATS			(SIOCDEVPRIVATE+2)
+--- a/net80211/ieee80211_wireless.c
++++ b/net80211/ieee80211_wireless.c
+@@ -2798,6 +2798,12 @@
+ 	case IEEE80211_PARAM_ROAM_RATE_11G:
+ 		vap->iv_roam.rate11b = value;
+ 		break;
++	case IEEE80211_PARAM_RSSI_DIS_THR:
++		vap->iv_rssi_dis_thr = value;
++		break;
++	case IEEE80211_PARAM_RSSI_DIS_COUNT:
++		vap->iv_rssi_dis_max = value;
++		break;
+ 	case IEEE80211_PARAM_UAPSDINFO:
+ 		if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
+ 			if (ic->ic_caps & IEEE80211_C_UAPSD) {
+@@ -3183,6 +3189,12 @@
+ 	case IEEE80211_PARAM_ROAM_RATE_11G:
+ 		param[0] = vap->iv_roam.rate11b;
+ 		break;
++	case IEEE80211_PARAM_RSSI_DIS_THR:
++		param[0] = vap->iv_rssi_dis_thr;
++		break;
++	case IEEE80211_PARAM_RSSI_DIS_COUNT:
++		param[0] = vap->iv_rssi_dis_max;
++		break;
+ 	case IEEE80211_PARAM_UAPSDINFO:
+ 		if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
+ 			if (IEEE80211_VAP_UAPSD_ENABLED(vap))
+@@ -5732,6 +5744,14 @@
+ 	  IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1, 0, "rate11g" },
+ 	{ IEEE80211_PARAM_ROAM_RATE_11G,
+ 	  0, IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1, "get_rate11g" },
++	{ IEEE80211_PARAM_RSSI_DIS_THR,
++	  IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1, 0, "rssi_disthr" },
++	{ IEEE80211_PARAM_RSSI_DIS_THR,
++	  0, IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1, "get_rssi_disthr" },
++	{ IEEE80211_PARAM_RSSI_DIS_COUNT,
++	  IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1, 0, "rssi_discnt" },
++	{ IEEE80211_PARAM_RSSI_DIS_COUNT,
++	  0, IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1, "get_rssi_discnt" },
+ 	{ IEEE80211_PARAM_UAPSDINFO,
+ 	  IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1, 0, "uapsd" },
+ 	{ IEEE80211_PARAM_UAPSDINFO,
+--- a/net80211/ieee80211_input.c
++++ b/net80211/ieee80211_input.c
+@@ -3263,6 +3263,17 @@
+ 
+ 			/* When rssi is low, start doing bgscans more frequently to allow
+ 			 * the supplicant to make a better switching decision */
++			if ((vap->iv_rssi_dis_thr > 0) && (vap->iv_rssi_dis_max > 0)) {
++				if ((rssi > 0) && (rssi < vap->iv_rssi_dis_thr)) {
++					if (++vap->iv_rssi_dis_trig > vap->iv_rssi_dis_max) {
++						vap->iv_rssi_dis_trig = 0;
++						ieee80211_node_leave(ni);
++						return;
++					}
++				} else {
++					vap->iv_rssi_dis_trig = 0;
++				}
++			}
+ 			if ((rssi < vap->iv_bgscanthr) &&
+ 					(!vap->iv_bgscanthr_next ||
+ 						!time_before(jiffies, vap->iv_bgscanthr_next)) &&
+--- a/net80211/ieee80211_var.h
++++ b/net80211/ieee80211_var.h
+@@ -223,6 +223,9 @@
+ 	u_int iv_bgscanintvl;				/* bg scan min interval */
+ 	u_int iv_bgscanthr;					/* bg scan rssi threshold */
+ 	u_int iv_bgscantrintvl;				/* bg scan trigger interval */
++	u_int iv_rssi_dis_thr;				/* rssi disassoc threshold */
++	u_int iv_rssi_dis_max;				/* max beacons below disconnect threshold */
++	u_int iv_rssi_dis_trig;				/* rssi disassoc trigger count */
+ 	unsigned long iv_bgscanthr_next;		/* last trigger for bgscan */
+ 	u_int iv_scanvalid;				/* scan cache valid threshold */
+ 	struct ieee80211_roam iv_roam;			/* sta-mode roaming state */