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From: Pradeep Kumar Chitrapu <pradeepc@codeaurora.org>
To: Johannes Berg <johannes@sipsolutions.net>, ath11k@lists.infradead.org
Cc: Pradeep Kumar Chitrapu <pradeepc@codeaurora.org>,
	linux-wireless@vger.kernel.org
Subject: [PATCH v3 1/9] cfg80211: Add helper function to identify 6GHz PSC channel
Date: Tue, 26 May 2020 15:42:09 -0700	[thread overview]
Message-ID: <20200526224217.11119-2-pradeepc@codeaurora.org> (raw)
In-Reply-To: <20200526224217.11119-1-pradeepc@codeaurora.org>

6GHz channels are divided into preferred scanning channels(PSC)
and non-PSC channels. One in every four 20MHz channels is a PSC.
Spec mandates to use only PSC channels as primary channels for
setting up BSS on 6GHz only AP.

The set of 20 MHz channels in the 6 GHz band, with channel center
frequency, ch_a = Channel starting frequency – 55 + 80 × n (MHz)
are referred to as preferred scanning channels (PSCs) where,
n = 1, …, 15 as per IEEE P802.11ax/D6.1.

This function can be used by drivers or cfg80211 when making
scanning decision on 6GHz channels.

Signed-off-by: Pradeep Kumar Chitrapu <pradeepc@codeaurora.org>
---
v3:
 - update channel starting frequency from 5945 to 5950 as per
   IEEE P802.11ax/D6.1
 - Define helper function and remove cahnnel flag PSC

 include/net/cfg80211.h | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index fd6a973b1249..bd27020ea8c9 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -5281,6 +5281,30 @@ ieee80211_get_channel(struct wiphy *wiphy, int freq)
 	return ieee80211_get_channel_khz(wiphy, MHZ_TO_KHZ(freq));
 }
 
+/**
+ * ieee80211_is_channel_psc - is 6ghz channel a Preferred Scanning Channel (PSC)
+ *
+ * @chan: struct ieee80211_channel to determine
+ * Return: True if 6ghz channel is a PSC channel. False for the rest.
+ */
+static inline bool ieee80211_is_channel_psc(struct ieee80211_channel *chan)
+{
+	if (chan->band != NL80211_BAND_6GHZ)
+		return false;
+
+	/*
+	 * From IEEE P802.11ax/D6.1: The set of 20 MHz channels in the 6 GHz
+	 * band, with channel center frequency, ch_a = Channel starting
+	 * frequency – 55  80 × n (MHz) are referred to as preferred scanning
+	 * channels (PSCs). Channel starting frequency is defined in 27.3.23.2
+	 * (Channel allocation in the 6 GHz band), and n = 1, …, 15.
+	 */
+	if (!(((chan->center_freq - 5950 + 55) >> 4) % 5))
+		return true;
+
+	return false;
+}
+
 /**
  * ieee80211_get_response_rate - get basic rate for a given rate
  *
-- 
2.17.1


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WARNING: multiple messages have this Message-ID (diff)
From: Pradeep Kumar Chitrapu <pradeepc@codeaurora.org>
To: Johannes Berg <johannes@sipsolutions.net>, ath11k@lists.infradead.org
Cc: linux-wireless@vger.kernel.org,
	Pradeep Kumar Chitrapu <pradeepc@codeaurora.org>
Subject: [PATCH v3 1/9] cfg80211: Add helper function to identify 6GHz PSC channel
Date: Tue, 26 May 2020 15:42:09 -0700	[thread overview]
Message-ID: <20200526224217.11119-2-pradeepc@codeaurora.org> (raw)
In-Reply-To: <20200526224217.11119-1-pradeepc@codeaurora.org>

6GHz channels are divided into preferred scanning channels(PSC)
and non-PSC channels. One in every four 20MHz channels is a PSC.
Spec mandates to use only PSC channels as primary channels for
setting up BSS on 6GHz only AP.

The set of 20 MHz channels in the 6 GHz band, with channel center
frequency, ch_a = Channel starting frequency – 55 + 80 × n (MHz)
are referred to as preferred scanning channels (PSCs) where,
n = 1, …, 15 as per IEEE P802.11ax/D6.1.

This function can be used by drivers or cfg80211 when making
scanning decision on 6GHz channels.

Signed-off-by: Pradeep Kumar Chitrapu <pradeepc@codeaurora.org>
---
v3:
 - update channel starting frequency from 5945 to 5950 as per
   IEEE P802.11ax/D6.1
 - Define helper function and remove cahnnel flag PSC

 include/net/cfg80211.h | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index fd6a973b1249..bd27020ea8c9 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -5281,6 +5281,30 @@ ieee80211_get_channel(struct wiphy *wiphy, int freq)
 	return ieee80211_get_channel_khz(wiphy, MHZ_TO_KHZ(freq));
 }
 
+/**
+ * ieee80211_is_channel_psc - is 6ghz channel a Preferred Scanning Channel (PSC)
+ *
+ * @chan: struct ieee80211_channel to determine
+ * Return: True if 6ghz channel is a PSC channel. False for the rest.
+ */
+static inline bool ieee80211_is_channel_psc(struct ieee80211_channel *chan)
+{
+	if (chan->band != NL80211_BAND_6GHZ)
+		return false;
+
+	/*
+	 * From IEEE P802.11ax/D6.1: The set of 20 MHz channels in the 6 GHz
+	 * band, with channel center frequency, ch_a = Channel starting
+	 * frequency – 55  80 × n (MHz) are referred to as preferred scanning
+	 * channels (PSCs). Channel starting frequency is defined in 27.3.23.2
+	 * (Channel allocation in the 6 GHz band), and n = 1, …, 15.
+	 */
+	if (!(((chan->center_freq - 5950 + 55) >> 4) % 5))
+		return true;
+
+	return false;
+}
+
 /**
  * ieee80211_get_response_rate - get basic rate for a given rate
  *
-- 
2.17.1


  reply	other threads:[~2020-05-26 22:42 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-26 22:42 [PATCH v3 0/9] add 6GHz radio support in ath11k driver Pradeep Kumar Chitrapu
2020-05-26 22:42 ` Pradeep Kumar Chitrapu
2020-05-26 22:42 ` Pradeep Kumar Chitrapu [this message]
2020-05-26 22:42   ` [PATCH v3 1/9] cfg80211: Add helper function to identify 6GHz PSC channel Pradeep Kumar Chitrapu
2020-05-28  7:08   ` Johannes Berg
2020-05-28  7:08     ` Johannes Berg
2020-05-28  7:41     ` Pradeep Kumar Chitrapu
2020-05-28  7:41       ` Pradeep Kumar Chitrapu
2020-05-26 22:42 ` [PATCH v3 2/9] ath11k: add 6G frequency list supported by driver Pradeep Kumar Chitrapu
2020-05-26 22:42   ` Pradeep Kumar Chitrapu
2020-05-26 22:42 ` [PATCH v3 3/9] ath11k: add support for 6GHz radio in driver Pradeep Kumar Chitrapu
2020-05-26 22:42   ` Pradeep Kumar Chitrapu
2020-05-26 22:42 ` [PATCH v3 4/9] ath11k: Use freq instead of channel number in rx path Pradeep Kumar Chitrapu
2020-05-26 22:42   ` Pradeep Kumar Chitrapu
2020-05-26 22:42 ` [PATCH v3 5/9] ath11k: extend peer_assoc_cmd for 6GHz band Pradeep Kumar Chitrapu
2020-05-26 22:42   ` Pradeep Kumar Chitrapu
2020-05-26 22:42 ` [PATCH v3 6/9] ath11k: set psc channel flag when sending channel list to firmware Pradeep Kumar Chitrapu
2020-05-26 22:42   ` Pradeep Kumar Chitrapu
2020-05-26 22:42 ` [PATCH v3 7/9] ath11k: Add 6G scan dwell time parameter in scan request command Pradeep Kumar Chitrapu
2020-05-26 22:42   ` Pradeep Kumar Chitrapu
2020-05-26 22:42 ` [PATCH v3 8/9] ath11k: Send multiple scan_chan_list messages if required Pradeep Kumar Chitrapu
2020-05-26 22:42   ` Pradeep Kumar Chitrapu
2020-05-26 22:42 ` [PATCH v3 9/9] ath11k: Add support for 6g scan hint Pradeep Kumar Chitrapu
2020-05-26 22:42   ` Pradeep Kumar Chitrapu

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