netdev - [PATCH net-next 1/4] net: airoha: Enable Tx drop capability for each Tx DMA ring

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Message-Id: <20250103-airoha-en7581-qdisc-offload-v1-1-608a23fa65d5@kernel.org>
Date: Fri, 03 Jan 2025 13:17:02 +0100
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: Felix Fietkau <nbd@....name>, Sean Wang <sean.wang@...iatek.com>, 
 Mark Lee <Mark-MC.Lee@...iatek.com>, Andrew Lunn <andrew+netdev@...n.ch>, 
 "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>
Cc: linux-arm-kernel@...ts.infradead.org, 
 linux-mediatek@...ts.infradead.org, netdev@...r.kernel.org, 
 upstream@...oha.com, Lorenzo Bianconi <lorenzo@...nel.org>
Subject: [PATCH net-next 1/4] net: airoha: Enable Tx drop capability for
 each Tx DMA ring

This is a preliminary patch in order to enable hw Qdisc offloading.

Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
 drivers/net/ethernet/mediatek/airoha_eth.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/mediatek/airoha_eth.c b/drivers/net/ethernet/mediatek/airoha_eth.c
index d8bfc21a5b194478e18201ee3beca7494c223e24..59e889cf08e49b89d20fa630f83a1c1322bae6b4 100644
--- a/drivers/net/ethernet/mediatek/airoha_eth.c
+++ b/drivers/net/ethernet/mediatek/airoha_eth.c
@@ -1789,6 +1789,10 @@ static int airoha_qdma_init_tx_queue(struct airoha_queue *q,
 		WRITE_ONCE(q->desc[i].ctrl, cpu_to_le32(val));
 	}

+	/* xmit ring drop default setting */
+	airoha_qdma_set(qdma, REG_TX_RING_BLOCKING(qid),
+			TX_RING_IRQ_BLOCKING_TX_DROP_EN_MASK);
+
 	airoha_qdma_wr(qdma, REG_TX_RING_BASE(qid), dma_addr);
 	airoha_qdma_rmw(qdma, REG_TX_CPU_IDX(qid), TX_RING_CPU_IDX_MASK,
 			FIELD_PREP(TX_RING_CPU_IDX_MASK, q->head));

-- 
2.47.1