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nl80211: Introduce scan flags to emphasize requested scan behavior

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This commit defines new scan flags (LOW_SPAN, LOW_POWER, HIGH_LATENCY)
to emphasize the requested scan behavior for the driver. These flags
are optional and are mutually exclusive. The implementation of the
respective functionality can be driver/hardware specific.

These flags can be used to control the compromise between how long
a scan takes, how much power it uses, and high accurate/complete
the scan is in finding the BSSs.

Signed-off-by: Sunil Dutt <usdutt@qti.qualcomm.com>
Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Sunil Dutt
2018-01-25 17:13:37 +02:00
committed by Johannes Berg
parent 6335698e24
commit 5037a00992
2 changed files with 38 additions and 3 deletions
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13
net/wireless/nl80211.c
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@@ -6715,8 +6715,17 @@ nl80211_check_scan_flags(struct wiphy *wiphy, struct wireless_dev *wdev,
*flags = nla_get_u32(attrs[NL80211_ATTR_SCAN_FLAGS]);
if ((*flags & NL80211_SCAN_FLAG_LOW_PRIORITY) &&
!(wiphy->features & NL80211_FEATURE_LOW_PRIORITY_SCAN))
if (((*flags & NL80211_SCAN_FLAG_LOW_PRIORITY) &&
!(wiphy->features & NL80211_FEATURE_LOW_PRIORITY_SCAN)) ||
((*flags & NL80211_SCAN_FLAG_LOW_SPAN) &&
!wiphy_ext_feature_isset(wiphy,
NL80211_EXT_FEATURE_LOW_SPAN_SCAN)) ||
((*flags & NL80211_SCAN_FLAG_LOW_POWER) &&
!wiphy_ext_feature_isset(wiphy,
NL80211_EXT_FEATURE_LOW_POWER_SCAN)) ||
((*flags & NL80211_SCAN_FLAG_HIGH_ACCURACY) &&
!wiphy_ext_feature_isset(wiphy,
NL80211_EXT_FEATURE_HIGH_ACCURACY_SCAN)))
return -EOPNOTSUPP;
if (*flags & NL80211_SCAN_FLAG_RANDOM_ADDR) {