[PATCH v2 07/22] mac80211: s1g: choose scanning width based on frequency

From: Thomas Pedersen <thomas@adapt-ip.com>
To: Johannes Berg <johannes@sipsolutions.net>
Cc: linux-wireless <linux-wireless@vger.kernel.org>,
	Thomas Pedersen <thomas@adapt-ip.com>
Subject: [PATCH v2 07/22] mac80211: s1g: choose scanning width based on frequency
Date: Mon, 31 Aug 2020 13:55:45 -0700	[thread overview]
Message-ID: <20200831205600.21058-8-thomas@adapt-ip.com> (raw)
In-Reply-To: <20200831205600.21058-1-thomas@adapt-ip.com>

An S1G BSS can beacon at either 1 or 2 MHz and the channel
width is unique to a given frequency. Ignore scan channel
width for now and use the allowed channel width.

Signed-off-by: Thomas Pedersen <thomas@adapt-ip.com>
---
 net/mac80211/scan.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index 5ac2785cdc7b..5002791fe165 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -905,6 +905,17 @@ static void ieee80211_scan_state_set_channel(struct ieee80211_local *local,
 	local->scan_chandef.center_freq1 = chan->center_freq;
 	local->scan_chandef.freq1_offset = chan->freq_offset;
 	local->scan_chandef.center_freq2 = 0;
+
+	/* For scanning on the S1G band, ignore scan_width (which is constant
+	 * across all channels) for now since channel width is specific to each
+	 * channel. Detect the required channel width here and likely revisit
+	 * later. Maybe scan_width could be used to build the channel scan list?
+	 */
+	if (chan->band == NL80211_BAND_S1GHZ) {
+		local->scan_chandef.width = ieee80211_s1g_channel_width(chan);
+		goto  set_channel;
+	}
+
 	switch (scan_req->scan_width) {
 	case NL80211_BSS_CHAN_WIDTH_5:
 		local->scan_chandef.width = NL80211_CHAN_WIDTH_5;
@@ -925,8 +936,14 @@ static void ieee80211_scan_state_set_channel(struct ieee80211_local *local,
 		else
 			local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
 		break;
+	case NL80211_BSS_CHAN_WIDTH_1:
+	case NL80211_BSS_CHAN_WIDTH_2:
+		/* shouldn't get here, S1G handled above */
+		WARN_ON(1);
+		break;
 	}
 
+set_channel:
 	if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL))
 		skip = 1;
 
-- 
2.20.1

