From 8f186693ec50d34275aef0dfa64a4874a649e279 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Sat, 12 Jul 2008 22:23:55 +0000 Subject: [PATCH] madwifi: add an optional background scanning threshold triggered by low rssi (useful for passing updated scan results to the wpa_supplicant ahead of time, before losing connectivity entirely) SVN-Revision: 11794 --- .../madwifi/patches/357-bgscan_thresh.patch | 127 ++++++++++++++++++ 1 file changed, 127 insertions(+) create mode 100644 package/madwifi/patches/357-bgscan_thresh.patch diff --git a/package/madwifi/patches/357-bgscan_thresh.patch b/package/madwifi/patches/357-bgscan_thresh.patch new file mode 100644 index 0000000000..e0d5752b32 --- /dev/null +++ b/package/madwifi/patches/357-bgscan_thresh.patch @@ -0,0 +1,127 @@ +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 + +--- a/net80211/ieee80211_ioctl.h ++++ b/net80211/ieee80211_ioctl.h +@@ -646,6 +646,7 @@ + IEEE80211_PARAM_MINRATE = 76, /* Maximum rate (by table index) */ + 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 */ + }; + + #define SIOCG80211STATS (SIOCDEVPRIVATE+2) +--- a/net80211/ieee80211_var.h ++++ b/net80211/ieee80211_var.h +@@ -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 */ + +@@ -219,6 +221,9 @@ + 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 */ + +@@ -608,6 +613,7 @@ + #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) +--- a/net80211/ieee80211_wireless.c ++++ b/net80211/ieee80211_wireless.c +@@ -2744,6 +2744,9 @@ + 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) +@@ -3144,6 +3147,9 @@ + 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; +@@ -5666,6 +5672,10 @@ + 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, +--- a/net80211/ieee80211_input.c ++++ b/net80211/ieee80211_input.c +@@ -3013,8 +3013,10 @@ + { + 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 +@@ -3258,6 +3260,23 @@ + /* 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: " +--- a/net80211/ieee80211_scan.c ++++ b/net80211/ieee80211_scan.c +@@ -782,7 +782,7 @@ + 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;