+++ /dev/null
-Add an optional background scanning threshold triggered by low rssi
-(useful for passing updated scan results to the supplicant ahead of
-time, before losing connectivity entirely)
-
-Signed-off-by: Felix Fietkau <nbd@openwrt.org>
-
-Index: madwifi-trunk-r3776/net80211/ieee80211_ioctl.h
-===================================================================
---- madwifi-trunk-r3776.orig/net80211/ieee80211_ioctl.h 2008-07-17 03:07:53.000000000 +0200
-+++ madwifi-trunk-r3776/net80211/ieee80211_ioctl.h 2008-07-17 04:03:30.000000000 +0200
-@@ -655,6 +655,7 @@
- IEEE80211_PARAM_MINRATE = 84, /* Minimum rate (by table index) */
- IEEE80211_PARAM_PROTMODE_RSSI = 85, /* RSSI Threshold for enabling protection mode */
- IEEE80211_PARAM_PROTMODE_TIMEOUT = 86, /* Timeout for expiring protection mode */
-+ IEEE80211_PARAM_BGSCAN_THRESH = 87, /* bg scan rssi threshold */
- };
-
- #define SIOCG80211STATS (SIOCDEVPRIVATE+2)
-Index: madwifi-trunk-r3776/net80211/ieee80211_var.h
-===================================================================
---- madwifi-trunk-r3776.orig/net80211/ieee80211_var.h 2008-07-17 02:56:18.000000000 +0200
-+++ madwifi-trunk-r3776/net80211/ieee80211_var.h 2008-07-17 04:03:07.000000000 +0200
-@@ -92,6 +92,8 @@
- #define IEEE80211_BGSCAN_IDLE_MIN 100 /* min idle time (ms) */
- #define IEEE80211_BGSCAN_IDLE_DEFAULT 250 /* default idle time (ms) */
-
-+#define IEEE80211_BGSCAN_TRIGGER_INTVL 20 /* min trigger interval for thresh based bgscan (secs) */
-+
- #define IEEE80211_COVERAGE_CLASS_MAX 31 /* max coverage class */
- #define IEEE80211_REGCLASSIDS_MAX 10 /* max regclass id list */
-
-@@ -229,6 +231,9 @@
- u_int8_t iv_nickname[IEEE80211_NWID_LEN];
- u_int iv_bgscanidle; /* bg scan idle threshold */
- u_int iv_bgscanintvl; /* bg scan min interval */
-+ u_int iv_bgscanthr; /* bg scan rssi threshold */
-+ u_int iv_bgscantrintvl; /* bg scan trigger interval */
-+ 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 */
-
-@@ -612,6 +617,7 @@
- #define IEEE80211_FEXT_SWBMISS 0x00000400 /* CONF: use software beacon timer */
- #define IEEE80211_FEXT_DROPUNENC_EAPOL 0x00000800 /* CONF: drop unencrypted eapol frames */
- #define IEEE80211_FEXT_APPIE_UPDATE 0x00001000 /* STATE: beacon APP IE updated */
-+#define IEEE80211_FEXT_BGSCAN_THR 0x00002000 /* bgscan due to low rssi */
-
- #define IEEE80211_COM_UAPSD_ENABLE(_ic) ((_ic)->ic_flags_ext |= IEEE80211_FEXT_UAPSD)
- #define IEEE80211_COM_UAPSD_DISABLE(_ic) ((_ic)->ic_flags_ext &= ~IEEE80211_FEXT_UAPSD)
-Index: madwifi-trunk-r3776/net80211/ieee80211_wireless.c
-===================================================================
---- madwifi-trunk-r3776.orig/net80211/ieee80211_wireless.c 2008-07-17 03:08:16.000000000 +0200
-+++ madwifi-trunk-r3776/net80211/ieee80211_wireless.c 2008-07-17 04:03:07.000000000 +0200
-@@ -2778,6 +2778,9 @@
- else
- retv = EINVAL;
- break;
-+ case IEEE80211_PARAM_BGSCAN_THRESH:
-+ vap->iv_bgscanthr = value;
-+ break;
- case IEEE80211_PARAM_MCAST_RATE:
- /* units are in KILObits per second */
- if (value >= 256 && value <= 54000)
-@@ -3181,6 +3184,9 @@
- case IEEE80211_PARAM_BGSCAN_INTERVAL:
- param[0] = vap->iv_bgscanintvl / HZ; /* seconds */
- break;
-+ case IEEE80211_PARAM_BGSCAN_THRESH:
-+ param[0] = vap->iv_bgscanthr; /* rssi */
-+ break;
- case IEEE80211_PARAM_MCAST_RATE:
- param[0] = vap->iv_mcast_rate; /* seconds */
- break;
-@@ -5704,6 +5710,10 @@
- IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1, 0, "bgscanintvl" },
- { IEEE80211_PARAM_BGSCAN_INTERVAL,
- 0, IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1, "get_bgscanintvl" },
-+ { IEEE80211_PARAM_BGSCAN_THRESH,
-+ IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1, 0, "bgscanthr" },
-+ { IEEE80211_PARAM_BGSCAN_THRESH,
-+ 0, IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1, "get_bgscanthr" },
- { IEEE80211_PARAM_MCAST_RATE,
- IW_PRIV_TYPE_INT | IW_PRIV_SIZE_FIXED | 1, 0, "mcast_rate" },
- { IEEE80211_PARAM_MCAST_RATE,
-Index: madwifi-trunk-r3776/net80211/ieee80211_input.c
-===================================================================
---- madwifi-trunk-r3776.orig/net80211/ieee80211_input.c 2008-07-17 02:56:18.000000000 +0200
-+++ madwifi-trunk-r3776/net80211/ieee80211_input.c 2008-07-17 04:03:07.000000000 +0200
-@@ -2984,8 +2984,10 @@
- {
- struct ieee80211com *ic = vap->iv_ic;
-
-+ vap->iv_bgscantrintvl = (vap->iv_bgscantrintvl + 1) % 4;
- return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) &&
-- time_after(jiffies, ic->ic_lastdata + vap->iv_bgscanidle));
-+ (((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN_THR) && !vap->iv_bgscantrintvl) ||
-+ time_after(jiffies, ic->ic_lastdata + vap->iv_bgscanidle)));
- }
-
- static __inline int
-@@ -3229,6 +3231,23 @@
- /* record tsf of last beacon */
- memcpy(ni->ni_tstamp.data, scan.tstamp,
- sizeof(ni->ni_tstamp));
-+
-+ /* When rssi is low, start doing bgscans more frequently to allow
-+ * the supplicant to make a better switching decision */
-+ if ((rssi < vap->iv_bgscanthr) &&
-+ (!vap->iv_bgscanthr_next ||
-+ !time_before(jiffies, vap->iv_bgscanthr_next)) &&
-+ !(ic->ic_flags & IEEE80211_F_SCAN)) {
-+ int ret;
-+
-+ ic->ic_lastdata = 0;
-+ ic->ic_lastscan = 0;
-+ ic->ic_flags_ext |= IEEE80211_FEXT_BGSCAN_THR;
-+ ret = ieee80211_bg_scan(vap);
-+ if (ret)
-+ vap->iv_bgscanthr_next = jiffies + msecs_to_jiffies(IEEE80211_BGSCAN_TRIGGER_INTVL * 1000);
-+ }
-+
- if (ni->ni_intval != scan.bintval) {
- IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
- "beacon interval divergence: "
-Index: madwifi-trunk-r3776/net80211/ieee80211_scan.c
-===================================================================
---- madwifi-trunk-r3776.orig/net80211/ieee80211_scan.c 2008-07-17 03:07:53.000000000 +0200
-+++ madwifi-trunk-r3776/net80211/ieee80211_scan.c 2008-07-17 04:03:07.000000000 +0200
-@@ -793,7 +793,7 @@
- ieee80211_sta_pwrsave(vap, 0);
- if (ss->ss_next >= ss->ss_last) {
- ieee80211_notify_scan_done(vap);
-- ic->ic_flags_ext &= ~IEEE80211_FEXT_BGSCAN;
-+ ic->ic_flags_ext &= ~(IEEE80211_FEXT_BGSCAN|IEEE80211_FEXT_BGSCAN_THR);
- }
- }
- SCAN_PRIVATE(ss)->ss_iflags &= ~ISCAN_CANCEL;
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