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BACKPORT: cfg80211: add a helper to identify 6 GHz PSCs

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This allows identifying whether or not a channel is a PSC
(preferred scanning channel).

Bug: 163110886

Link: https://lore.kernel.org/r/20200528213443.414363ecf62c.Ic15e681a0e249eab7350a06ceb582cca8bb9a080@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Change-Id: Ia0b369ead18ce1d1e585df9467d680be4aa8adef
(cherry picked from commit afbc9c9e8bfe71e8bd12a8c01bedd969fbab8f0e)
Signed-off-by: Vamsi Krishna <vamsin@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Johannes Berg 2020-05-28 21:34:25 +02:00 • committed by Greg Kroah-Hartman
commit bdb178cf07
1 changed files with 15 additions and 0 deletions
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15
include/net/cfg80211.h
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@ -5209,6 +5209,21 @@ ieee80211_get_channel(struct wiphy *wiphy, int freq)
return ieee80211_get_channel_khz(wiphy, MHZ_TO_KHZ(freq));
}
/**
* cfg80211_channel_is_psc - Check if the channel is a 6 GHz PSC
* @chan: control channel to check
*
* The Preferred Scanning Channels (PSC) are defined in
* Draft IEEE P802.11ax/D5.0, 26.17.2.3.3
*/
static inline bool cfg80211_channel_is_psc(struct ieee80211_channel *chan)
{
if (chan->band != NL80211_BAND_6GHZ)
return false;
return ieee80211_frequency_to_channel(chan->center_freq) % 16 == 5;
}
/**
* ieee80211_get_response_rate - get basic rate for a given rate
*