From 5d3a160365306c4161b7064d482c26a85829f170 Mon Sep 17 00:00:00 2001 From: Eyal Shapira Date: Sat, 8 Dec 2012 02:58:23 +0200 Subject: [PATCH] wlcore: increase scan dwell times if no activity There's a limit on scan dwell times of max 30ms in order to avoid degrading voip traffic which could be going on while scanning. However these dwell times increase the chance of missing out on nearby APs leading to partial scan results. Allow configuration of longer dwell times in case there no active interface (i.e. no STA associated or AP up). [Arik - count started vifs using an in-driver function] [Fixed some new checkpatch warnings regarding comments in the networking subsystem. -- Luca] Signed-off-by: Eyal Shapira Signed-off-by: Arik Nemtsov Signed-off-by: Luciano Coelho --- drivers/net/wireless/ti/wl12xx/main.c | 2 ++ drivers/net/wireless/ti/wl18xx/main.c | 2 ++ drivers/net/wireless/ti/wlcore/conf.h | 22 ++++++++++++++++++++ drivers/net/wireless/ti/wlcore/scan.c | 30 ++++++++++++++++++++++++--- 4 files changed, 53 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/ti/wl12xx/main.c b/drivers/net/wireless/ti/wl12xx/main.c index 8b4827f47deb..08b67625f7ff 100644 --- a/drivers/net/wireless/ti/wl12xx/main.c +++ b/drivers/net/wireless/ti/wl12xx/main.c @@ -269,6 +269,8 @@ static struct wlcore_conf wl12xx_conf = { .scan = { .min_dwell_time_active = 7500, .max_dwell_time_active = 30000, + .min_dwell_time_active_long = 25000, + .max_dwell_time_active_long = 50000, .dwell_time_passive = 100000, .dwell_time_dfs = 150000, .num_probe_reqs = 2, diff --git a/drivers/net/wireless/ti/wl18xx/main.c b/drivers/net/wireless/ti/wl18xx/main.c index 55fd46b9628d..62f431a2ed34 100644 --- a/drivers/net/wireless/ti/wl18xx/main.c +++ b/drivers/net/wireless/ti/wl18xx/main.c @@ -396,6 +396,8 @@ static struct wlcore_conf wl18xx_conf = { .scan = { .min_dwell_time_active = 7500, .max_dwell_time_active = 30000, + .min_dwell_time_active_long = 25000, + .max_dwell_time_active_long = 50000, .dwell_time_passive = 100000, .dwell_time_dfs = 150000, .num_probe_reqs = 2, diff --git a/drivers/net/wireless/ti/wlcore/conf.h b/drivers/net/wireless/ti/wlcore/conf.h index fd173b9ca46a..2b96ff821341 100644 --- a/drivers/net/wireless/ti/wlcore/conf.h +++ b/drivers/net/wireless/ti/wlcore/conf.h @@ -1088,6 +1088,7 @@ struct conf_roam_trigger_settings { struct conf_scan_settings { /* * The minimum time to wait on each channel for active scans + * This value will be used whenever there's a connected interface. * * Range: u32 tu/1000 */ @@ -1095,11 +1096,32 @@ struct conf_scan_settings { /* * The maximum time to wait on each channel for active scans + * This value will be currently used whenever there's a + * connected interface. It shouldn't exceed 30000 (~30ms) to avoid + * possible interference of voip traffic going on while scanning. * * Range: u32 tu/1000 */ u32 max_dwell_time_active; + /* The minimum time to wait on each channel for active scans + * when it's possible to have longer scan dwell times. + * Currently this is used whenever we're idle on all interfaces. + * Longer dwell times improve detection of networks within a + * single scan. + * + * Range: u32 tu/1000 + */ + u32 min_dwell_time_active_long; + + /* The maximum time to wait on each channel for active scans + * when it's possible to have longer scan dwell times. + * See min_dwell_time_active_long + * + * Range: u32 tu/1000 + */ + u32 max_dwell_time_active_long; + /* time to wait on the channel for passive scans (in TU/1000) */ u32 dwell_time_passive; diff --git a/drivers/net/wireless/ti/wlcore/scan.c b/drivers/net/wireless/ti/wlcore/scan.c index 7f42f8a4d90b..6cfdeaea12f0 100644 --- a/drivers/net/wireless/ti/wlcore/scan.c +++ b/drivers/net/wireless/ti/wlcore/scan.c @@ -89,6 +89,25 @@ out: } +static void wlcore_started_vifs_iter(void *data, u8 *mac, + struct ieee80211_vif *vif) +{ + int *count = (int *)data; + + if (!vif->bss_conf.idle) + (*count)++; +} + +static int wlcore_count_started_vifs(struct wl1271 *wl) +{ + int count = 0; + + ieee80211_iterate_active_interfaces_atomic(wl->hw, + IEEE80211_IFACE_ITER_RESUME_ALL, + wlcore_started_vifs_iter, &count); + return count; +} + static int wlcore_scan_get_channels(struct wl1271 *wl, struct ieee80211_channel *req_channels[], @@ -109,9 +128,14 @@ wlcore_scan_get_channels(struct wl1271 *wl, /* configure dwell times according to scan type */ if (scan_type == SCAN_TYPE_SEARCH) { struct conf_scan_settings *c = &wl->conf.scan; - - min_dwell_time_active = c->min_dwell_time_active; - max_dwell_time_active = c->max_dwell_time_active; + bool active_vif_exists = !!wlcore_count_started_vifs(wl); + + min_dwell_time_active = active_vif_exists ? + c->min_dwell_time_active : + c->min_dwell_time_active_long; + max_dwell_time_active = active_vif_exists ? + c->max_dwell_time_active : + c->max_dwell_time_active_long; dwell_time_passive = c->dwell_time_passive; dwell_time_dfs = c->dwell_time_dfs; } else { -- 2.39.2