[PATCH v1 2/2] wifi: mt76: mt7925: Add coredump end collect mechanism

[Eason Lai <eason.lai@mediatek.com>]

From: "ck.chang" <ck.chang@mediatek.com>

Add collect mechanism, when parse to specific coredump string, immediately save the collected coredump content into coredump file

Signed-off-by: ck.chang <ck.chang@mediatek.com>
---
 drivers/net/wireless/mediatek/mt76/mt76_connac.h |  1 +
 drivers/net/wireless/mediatek/mt76/mt7925/mac.c  |  8 +++++++-
 drivers/net/wireless/mediatek/mt76/mt7925/mcu.c  | 10 +++++++++-
 3 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt76_connac.h b/drivers/net/wireless/mediatek/mt76/mt76_connac.h
index b1677ca24703..6374add14160 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76_connac.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76_connac.h
@@ -128,6 +128,7 @@ struct mt76_connac_coredump {
 	struct sk_buff_head msg_list;
 	struct delayed_work work;
 	unsigned long last_activity;
+	bool complete;
 };
 
 struct mt76_connac_sta_key_conf {
diff --git a/drivers/net/wireless/mediatek/mt76/mt7925/mac.c b/drivers/net/wireless/mediatek/mt76/mt7925/mac.c
index b5dd1b58618c..77b6fa34a1ba 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7925/mac.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7925/mac.c
@@ -1580,12 +1580,18 @@ void mt7925_coredump_work(struct work_struct *work)
 
 	dev = (struct mt792x_dev *)container_of(work, struct mt792x_dev, coredump.work.work);
 
-	if (time_is_after_jiffies(dev->coredump.last_activity +
+	/* if received the last coredump payload or timeout, start
+	 * saving coredump file and trigger reset.
+	 * Otherwise, wait for other coredump payload coming
+	 */
+	if (!dev->coredump.complete &&
+		time_is_after_jiffies(dev->coredump.last_activity +
 				  4 * MT76_CONNAC_COREDUMP_TIMEOUT)) {
 		queue_delayed_work(dev->mt76.wq, &dev->coredump.work,
 				   MT76_CONNAC_COREDUMP_TIMEOUT);
 		return;
 	}
+	dev->coredump.complete = false;
 
 	skb_queue_head_init(&local_list);
 	spin_lock_bh(&dev->mt76.lock);
diff --git a/drivers/net/wireless/mediatek/mt76/mt7925/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7925/mcu.c
index fa29c486a455..c4194c800dc6 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7925/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7925/mcu.c
@@ -671,6 +671,7 @@ static void
 mt7925_mcu_uni_rx_unsolicited_event(struct mt792x_dev *dev,
 				    struct sk_buff *skb)
 {
+#define COREDUMP_END_STR	"; coredump end"
 	struct mt7925_mcu_rxd *rxd;
 
 	rxd = (struct mt7925_mcu_rxd *)skb->data;
@@ -700,10 +701,17 @@ mt7925_mcu_uni_rx_unsolicited_event(struct mt792x_dev *dev,
 	case MCU_UNI_EVENT_RSSI_MONITOR:
 		mt7925_mcu_rssi_monitor_event(dev, skb);
 		break;
-	case MCU_UNI_EVENT_COREDUMP:
+	case MCU_UNI_EVENT_COREDUMP: {
+		size_t hdr_len = sizeof(struct mt7925_mcu_rxd) + 8;
+
 		dev->fw_assert = true;
+		if (skb->len > hdr_len &&
+			strnstr(skb->data + hdr_len, COREDUMP_END_STR,
+				skb->len - hdr_len))
+			dev->coredump.complete = true;
 		mt76_connac_mcu_coredump_event(&dev->mt76, skb, &dev->coredump);
 		return;
+	}
 	case MCU_UNI_EVENT_NAN:
 		mt7925_nan_mcu_event(dev, skb);
 		break;
-- 
2.45.2