net: ethernet: mtk_eth_soc: reset all TX queues on DMA free

[ Upstream commit 4db6c75 ]

The purpose of resetting the TX queue is to reset the byte and packet
count as well as to clear the software flow control XOFF bit.

MediaTek developers pointed out that netdev_reset_queue would only
resets queue 0 of the network device.

Queues that are not reset may cause unexpected issues.

Packets may stop being sent after reset and "transmit timeout" log may
be displayed.

Import fix from MediaTek's SDK to resolve this issue.

Link: https://git01.mediatek.com/plugins/gitiles/openwrt/feeds/mtk-openwrt-feeds/+/319c0d9905579a46dc448579f892f364f1f84818
Fixes: f63959c ("net: ethernet: mtk_eth_soc: implement multi-queue support for per-port queues")
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Link: https://patch.msgid.link/c9ff9adceac4f152239a0f65c397f13547639175.1746406763.git.daniel@makrotopia.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/net/ethernet/mediatek/mtk_eth_soc.c

@@ -3140,11 +3140,19 @@ static int mtk_dma_init(struct mtk_eth *eth)
 static void mtk_dma_free(struct mtk_eth *eth)
 {
 	const struct mtk_soc_data *soc = eth->soc;
-	int i;
+	int i, j, txqs = 1;
+
+	if (MTK_HAS_CAPS(eth->soc->caps, MTK_QDMA))
+		txqs = MTK_QDMA_NUM_QUEUES;
+
+	for (i = 0; i < MTK_MAX_DEVS; i++) {
+		if (!eth->netdev[i])
+			continue;
+
+		for (j = 0; j < txqs; j++)
+			netdev_tx_reset_subqueue(eth->netdev[i], j);
+	}
 
-	for (i = 0; i < MTK_MAX_DEVS; i++)
-		if (eth->netdev[i])
-			netdev_reset_queue(eth->netdev[i]);
 	if (!MTK_HAS_CAPS(soc->caps, MTK_SRAM) && eth->scratch_ring) {
 		dma_free_coherent(eth->dma_dev,
 				  MTK_QDMA_RING_SIZE * soc->tx.desc_size,