[PATCH wireless-next 8/8] wifi: mm81x: tx multicast frames from AP at primary width

[Lachlan Hodges <lachlan.hodges@morsemicro.com>]

If an AP has stations that are operating on a sub-primary (i.e using
the 4MHz primary of the 8MHz operating) multicast frames sent on the
operating width will be lost. Make sure we tx them on the primary width
to ensure all stations are capabile of receiving them.

Signed-off-by: Lachlan Hodges <lachlan.hodges@morsemicro.com>
---
 drivers/net/wireless/morsemicro/mm81x/mac.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/net/wireless/morsemicro/mm81x/mac.c b/drivers/net/wireless/morsemicro/mm81x/mac.c
index d77df6e9af85..4485748518b4 100644
--- a/drivers/net/wireless/morsemicro/mm81x/mac.c
+++ b/drivers/net/wireless/morsemicro/mm81x/mac.c
@@ -1257,6 +1257,15 @@ static int mm81x_tx_h_get_bw(struct mm81x *mors, struct ieee80211_sta *sta,
 	if (is_mgmt || info->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO)
 		return cfg80211_chandef_s1g_pri_width(&mors->chandef);
 
+	/*
+	 * In AP mode group addressed frames go out at the primary width so
+	 * that every associated STA can receive them, including any that
+	 * cannot support the operating width.
+	 */
+	if (info->control.vif->type == NL80211_IFTYPE_AP &&
+	    is_multicast_ether_addr(ieee80211_get_DA(hdr)))
+		return cfg80211_chandef_s1g_pri_width(&mors->chandef);
+
 	if (sta)
 		mors_sta = (struct mm81x_sta *)sta->drv_priv;
 
-- 
2.43.0