wifi: mac80211: add flag to disallow puncturing in 5 GHz

Some devices may not be capable of handling puncturing in 5 GHz
only (vs. the current flag that just removes puncturing support
completely). Add a flag to support such devices: check and then
downgrade the channel width if needed.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://msgid.link/20240318184907.49759510da7d.I12c5a61f0be512e0c4e574c2f794ef4b37ecaf6b@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

include/net/mac80211.h

@@ -2779,6 +2779,8 @@ struct ieee80211_txq {
  *
  * @IEEE80211_HW_DISALLOW_PUNCTURING: HW requires disabling puncturing in EHT
  *	and connecting with a lower bandwidth instead
+ * @IEEE80211_HW_DISALLOW_PUNCTURING_5GHZ: HW requires disabling puncturing in
+ *	EHT in 5 GHz and connecting with a lower bandwidth instead
  *
  * @IEEE80211_HW_HANDLES_QUIET_CSA: HW/driver handles quieting for CSA, so
  *	no need to stop queues. This really should be set by a driver that
@@ -2843,6 +2845,7 @@ enum ieee80211_hw_flags {
 	IEEE80211_HW_DETECTS_COLOR_COLLISION,
 	IEEE80211_HW_MLO_MCAST_MULTI_LINK_TX,
 	IEEE80211_HW_DISALLOW_PUNCTURING,
+	IEEE80211_HW_DISALLOW_PUNCTURING_5GHZ,
 	IEEE80211_HW_HANDLES_QUIET_CSA,
 
 	/* keep last, obviously */

net/mac80211/debugfs.c

@@ -498,6 +498,7 @@ static const char *hw_flag_names[] = {
 	FLAG(DETECTS_COLOR_COLLISION),
 	FLAG(MLO_MCAST_MULTI_LINK_TX),
 	FLAG(DISALLOW_PUNCTURING),
+	FLAG(DISALLOW_PUNCTURING_5GHZ),
 	FLAG(HANDLES_QUIET_CSA),
 #undef FLAG
 };

net/mac80211/mlme.c

@@ -599,6 +599,10 @@ static bool ieee80211_chandef_usable(struct ieee80211_sub_if_data *sdata,
 	    ieee80211_hw_check(&sdata->local->hw, DISALLOW_PUNCTURING))
 		return false;
 
+	if (chandef->punctured && chandef->chan->band == NL80211_BAND_5GHZ &&
+	    ieee80211_hw_check(&sdata->local->hw, DISALLOW_PUNCTURING_5GHZ))
+		return false;
+
 	return true;
 }