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Enable ACK timeout estimation algorithm (dynack) using mac80211 set_coverage_class API. Dynack is activated passing coverage class equals to -1 to lower drivers and it is automatically disabled setting valid value for coverage class. Define NL80211_ATTR_WIPHY_DYN_ACK flag attribute to enable dynack from userspace. In order to activate dynack NL80211_FEATURE_ACKTO_ESTIMATION feature flag must be set by lower drivers to indicate dynack capability. Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi83@gmail.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>