linux-kernel - [PATCH v2] wcn36xx: handle connection loss indication

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Message-Id: <20210901180606.11686-1-benl@squareup.com>
Date:   Wed,  1 Sep 2021 11:06:05 -0700
From:   Benjamin Li <benl@...areup.com>
To:     Kalle Valo <kvalo@...eaurora.org>
Cc:     Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Loic Poulain <loic.poulain@...aro.org>,
        Benjamin Li <benl@...areup.com>, stable@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, wcn36xx@...ts.infradead.org,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2] wcn36xx: handle connection loss indication

Firmware sends delete_sta_context_ind when it detects the AP has gone
away in STA mode. Right now the handler for that indication only handles
AP mode; fix it to also handle STA mode.

Cc: stable@...r.kernel.org
Signed-off-by: Benjamin Li <benl@...areup.com>
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Reviewed-by: Loic Poulain <loic.poulain@...aro.org>
---
 drivers/net/wireless/ath/wcn36xx/smd.c | 44 +++++++++++++++++++-------
 1 file changed, 33 insertions(+), 11 deletions(-)

diff --git a/drivers/net/wireless/ath/wcn36xx/smd.c b/drivers/net/wireless/ath/wcn36xx/smd.c
index 57fa857b290b..f6bea896abe8 100644
--- a/drivers/net/wireless/ath/wcn36xx/smd.c
+++ b/drivers/net/wireless/ath/wcn36xx/smd.c
@@ -2623,30 +2623,52 @@ static int wcn36xx_smd_delete_sta_context_ind(struct wcn36xx *wcn,
 					      size_t len)
 {
 	struct wcn36xx_hal_delete_sta_context_ind_msg *rsp = buf;
-	struct wcn36xx_vif *tmp;
+	struct wcn36xx_vif *vif_priv;
+	struct ieee80211_vif *vif;
+	struct ieee80211_bss_conf *bss_conf;
 	struct ieee80211_sta *sta;
+	bool found = false;
 
 	if (len != sizeof(*rsp)) {
 		wcn36xx_warn("Corrupted delete sta indication\n");
 		return -EIO;
 	}
 
-	wcn36xx_dbg(WCN36XX_DBG_HAL, "delete station indication %pM index %d\n",
-		    rsp->addr2, rsp->sta_id);
+	wcn36xx_dbg(WCN36XX_DBG_HAL,
+		    "delete station indication %pM index %d reason %d\n",
+		    rsp->addr2, rsp->sta_id, rsp->reason_code);
 
-	list_for_each_entry(tmp, &wcn->vif_list, list) {
+	list_for_each_entry(vif_priv, &wcn->vif_list, list) {
 		rcu_read_lock();
-		sta = ieee80211_find_sta(wcn36xx_priv_to_vif(tmp), rsp->addr2);
-		if (sta)
-			ieee80211_report_low_ack(sta, 0);
+		vif = wcn36xx_priv_to_vif(vif_priv);
+
+		if (vif->type == NL80211_IFTYPE_STATION) {
+			/* We could call ieee80211_find_sta too, but checking
+			 * bss_conf is clearer.
+			 */
+			bss_conf = &vif->bss_conf;
+			if (vif_priv->sta_assoc &&
+			    !memcmp(bss_conf->bssid, rsp->addr2, ETH_ALEN)) {
+				found = true;
+				wcn36xx_dbg(WCN36XX_DBG_HAL,
+					    "connection loss bss_index %d\n",
+					    vif_priv->bss_index);
+				ieee80211_connection_loss(vif);
+			}
+		} else {
+			sta = ieee80211_find_sta(vif, rsp->addr2);
+			if (sta) {
+				found = true;
+				ieee80211_report_low_ack(sta, 0);
+			}
+		}
+
 		rcu_read_unlock();
-		if (sta)
+		if (found)
 			return 0;
 	}
 
-	wcn36xx_warn("STA with addr %pM and index %d not found\n",
-		     rsp->addr2,
-		     rsp->sta_id);
+	wcn36xx_warn("BSS or STA with addr %pM not found\n", rsp->addr2);
 	return -ENOENT;
 }
 
-- 
2.17.1