netdev - [PATCH v2 net-next] net: ethernet: mtk_wed: do not assume offload callbacks are always set

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Date: Wed, 13 Sep 2023 20:42:47 +0200
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: netdev@...r.kernel.org
Cc: lorenzo.bianconi@...hat.com,
	nbd@....name,
	john@...ozen.org,
	sean.wang@...iatek.com,
	Mark-MC.Lee@...iatek.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	horms@...nel.org
Subject: [PATCH v2 net-next] net: ethernet: mtk_wed: do not assume offload callbacks are always set

Check if wlan.offload_enable and wlan.offload_disable callbacks are set
in mtk_wed_flow_add/mtk_wed_flow_remove since mt7996 will not rely
on them.

Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
Changes since v1:
- move offload check inside hw_lock critical section
---
 drivers/net/ethernet/mediatek/mtk_wed.c | 32 +++++++++++++------------
 1 file changed, 17 insertions(+), 15 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_wed.c b/drivers/net/ethernet/mediatek/mtk_wed.c
index 94376aa2b34c..e7d3525d2e30 100644
--- a/drivers/net/ethernet/mediatek/mtk_wed.c
+++ b/drivers/net/ethernet/mediatek/mtk_wed.c
@@ -1713,19 +1713,20 @@ mtk_wed_irq_set_mask(struct mtk_wed_device *dev, u32 mask)
 int mtk_wed_flow_add(int index)
 {
 	struct mtk_wed_hw *hw = hw_list[index];
-	int ret;
+	int ret = 0;
 
-	if (!hw || !hw->wed_dev)
-		return -ENODEV;
+	mutex_lock(&hw_lock);
 
-	if (hw->num_flows) {
-		hw->num_flows++;
-		return 0;
+	if (!hw || !hw->wed_dev) {
+		ret = -ENODEV;
+		goto out;
 	}
 
-	mutex_lock(&hw_lock);
-	if (!hw->wed_dev) {
-		ret = -ENODEV;
+	if (!hw->wed_dev->wlan.offload_enable)
+		goto out;
+
+	if (hw->num_flows) {
+		hw->num_flows++;
 		goto out;
 	}
 
@@ -1744,14 +1745,15 @@ void mtk_wed_flow_remove(int index)
 {
 	struct mtk_wed_hw *hw = hw_list[index];
 
-	if (!hw)
-		return;
+	mutex_lock(&hw_lock);
 
-	if (--hw->num_flows)
-		return;
+	if (!hw || !hw->wed_dev)
+		goto out;
 
-	mutex_lock(&hw_lock);
-	if (!hw->wed_dev)
+	if (!hw->wed_dev->wlan.offload_disable)
+		goto out;
+
+	if (--hw->num_flows)
 		goto out;
 
 	hw->wed_dev->wlan.offload_disable(hw->wed_dev);
-- 
2.41.0