linux-kernel - [PATCH net] net: mv643xx_eth: implement descriptor cleanup in txq_submit

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Message-Id: <20250124062414.195101-1-dheeraj.linuxdev@gmail.com>
Date: Fri, 24 Jan 2025 11:54:14 +0530
From: Dheeraj Reddy Jonnalagadda <dheeraj.linuxdev@...il.com>
To: sebastian.hesselbarth@...il.com,
	netdev@...r.kernel.org
Cc: andrew+netdev@...n.ch,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	linux-kernel@...r.kernel.org,
	Dheeraj Reddy Jonnalagadda <dheeraj.linuxdev@...il.com>
Subject: [PATCH net] net: mv643xx_eth: implement descriptor cleanup in txq_submit_tso

Implement cleanup of used descriptors in the error path of txq_submit_tso.

Fixes: 3ae8f4e0b98b ("net: mv643xx_eth: Implement software TSO")
Signed-off-by: Dheeraj Reddy Jonnalagadda <dheeraj.linuxdev@...il.com>
---
 drivers/net/ethernet/marvell/mv643xx_eth.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/marvell/mv643xx_eth.c b/drivers/net/ethernet/marvell/mv643xx_eth.c
index 67a6ff07c83d..8d217f8d451e 100644
--- a/drivers/net/ethernet/marvell/mv643xx_eth.c
+++ b/drivers/net/ethernet/marvell/mv643xx_eth.c
@@ -881,10 +881,20 @@ static int txq_submit_tso(struct tx_queue *txq, struct sk_buff *skb,
 	txq_enable(txq);
 	txq->tx_desc_count += desc_count;
 	return 0;
+
 err_release:
-	/* TODO: Release all used data descriptors; header descriptors must not
+	/* Release all used data descriptors; header descriptors must not
 	 * be DMA-unmapped.
 	 */
+	for (int i = 0; i < desc_count; i++) {
+		int desc_index = (txq->tx_curr_desc + i) % txq->tx_ring_size;
+		struct tx_desc *desc = &txq->tx_desc_area[desc_index];
+		desc->cmd_sts = 0; /* Reset the descriptor */
+	}
+
+	/* Adjust the descriptor count */
+	txq->tx_desc_count -= desc_count;
+
 	return ret;
 }
 
-- 
2.34.1