netdev - [PATCH net] net: airoha: Update tx cpu dma ring idx at the end of xmit loop

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Message-Id: <20241004-airoha-eth-7581-mapping-fix-v1-1-8e4279ab1812@kernel.org>
Date: Fri, 04 Oct 2024 15:51:26 +0200
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: Felix Fietkau <nbd@....name>, Sean Wang <sean.wang@...iatek.com>, 
 Mark Lee <Mark-MC.Lee@...iatek.com>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Lorenzo Bianconi <lorenzo@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org, 
 linux-mediatek@...ts.infradead.org, netdev@...r.kernel.org
Subject: [PATCH net] net: airoha: Update tx cpu dma ring idx at the end of
 xmit loop

Move the tx cpu dma ring index update out of transmit loop of
airoha_dev_xmit routine in order to not start transmitting the packet
before it is fully DMA mapped (e.g. fragmented skbs).

Fixes: 23020f049327 ("net: airoha: Introduce ethernet support for EN7581 SoC")
Reported-by: Felix Fietkau <nbd@....name>
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
 drivers/net/ethernet/mediatek/airoha_eth.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/airoha_eth.c b/drivers/net/ethernet/mediatek/airoha_eth.c
index 930f180688e5caf1175481a43d243812bc07be07..2c26eb185283725ff50803437dac5143d7884b5a 100644
--- a/drivers/net/ethernet/mediatek/airoha_eth.c
+++ b/drivers/net/ethernet/mediatek/airoha_eth.c
@@ -2471,10 +2471,6 @@ static netdev_tx_t airoha_dev_xmit(struct sk_buff *skb,
 		e->dma_addr = addr;
 		e->dma_len = len;

-		airoha_qdma_rmw(qdma, REG_TX_CPU_IDX(qid),
-				TX_RING_CPU_IDX_MASK,
-				FIELD_PREP(TX_RING_CPU_IDX_MASK, index));
-
 		data = skb_frag_address(frag);
 		len = skb_frag_size(frag);
 	}
@@ -2483,6 +2479,11 @@ static netdev_tx_t airoha_dev_xmit(struct sk_buff *skb,
 	q->queued += i;

 	skb_tx_timestamp(skb);
+	if (!netdev_xmit_more())
+		airoha_qdma_rmw(qdma, REG_TX_CPU_IDX(qid),
+				TX_RING_CPU_IDX_MASK,
+				FIELD_PREP(TX_RING_CPU_IDX_MASK, q->head));
+
 	if (q->ndesc - q->queued < q->free_thr)
 		netif_tx_stop_queue(txq);

---
base-commit: 096c0fa42afa92b6ffa4e441c4c72a2f805c5a88
change-id: 20241004-airoha-eth-7581-mapping-fix-919481cbb340

Best regards,
-- 
Lorenzo Bianconi <lorenzo@...nel.org>