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net: airoha: Add missing bits in airoha_qdma_cleanup_tx_queue()

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Similar to airoha_qdma_cleanup_rx_queue(), reset DMA TX descriptors in
airoha_qdma_cleanup_tx_queue routine. Moreover, reset TX_DMA_IDX to
TX_CPU_IDX to notify the NIC the QDMA TX ring is empty.

Fixes: 23020f0493 ("net: airoha: Introduce ethernet support for EN7581 SoC")
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://patch.msgid.link/20260417-airoha_qdma_cleanup_tx_queue-fix-net-v4-2-e04bcc2c9642@kernel.org
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Lorenzo Bianconi
2026-04-17 08:36:32 +02:00
committed by Paolo Abeni
parent f329924bb4
commit 3309965fe4
1 changed files with 30 additions and 2 deletions
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32
drivers/net/ethernet/airoha/airoha_eth.c
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@@ -1063,12 +1063,15 @@ static int airoha_qdma_init_tx(struct airoha_qdma *qdma)
static void airoha_qdma_cleanup_tx_queue(struct airoha_queue *q)
{
struct airoha_eth *eth = q->qdma->eth;
int i;
struct airoha_qdma *qdma = q->qdma;
struct airoha_eth *eth = qdma->eth;
int i, qid = q - &qdma->q_tx[0];
u16 index = 0;
spin_lock_bh(&q->lock);
for (i = 0; i < q->ndesc; i++) {
struct airoha_queue_entry *e = &q->entry[i];
struct airoha_qdma_desc *desc = &q->desc[i];
if (!e->dma_addr)
continue;
@@ -1079,8 +1082,33 @@ static void airoha_qdma_cleanup_tx_queue(struct airoha_queue *q)
e->dma_addr = 0;
e->skb = NULL;
list_add_tail(&e->list, &q->tx_list);
/* Reset DMA descriptor */
WRITE_ONCE(desc->ctrl, 0);
WRITE_ONCE(desc->addr, 0);
WRITE_ONCE(desc->data, 0);
WRITE_ONCE(desc->msg0, 0);
WRITE_ONCE(desc->msg1, 0);
WRITE_ONCE(desc->msg2, 0);
q->queued--;
}
if (!list_empty(&q->tx_list)) {
struct airoha_queue_entry *e;
e = list_first_entry(&q->tx_list, struct airoha_queue_entry,
list);
index = e - q->entry;
}
/* Set TX_DMA_IDX to TX_CPU_IDX to notify the hw the QDMA TX ring is
* empty.
*/
airoha_qdma_rmw(qdma, REG_TX_CPU_IDX(qid), TX_RING_CPU_IDX_MASK,
FIELD_PREP(TX_RING_CPU_IDX_MASK, index));
airoha_qdma_rmw(qdma, REG_TX_DMA_IDX(qid), TX_RING_DMA_IDX_MASK,
FIELD_PREP(TX_RING_DMA_IDX_MASK, index));
spin_unlock_bh(&q->lock);
}