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

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[ Upstream commit 4db6c75124d871fbabf8243f947d34cc7e0697fc ]

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: 319c0d9905
Fixes: f63959c7ee ("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>
This commit is contained in:
Daniel Golle
2025-05-05 02:07:32 +01:00
committed by Greg Kroah-Hartman
parent 370635397b
commit 68f29bb97a
1 changed files with 12 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/net/ethernet/mediatek/mtk_eth_soc.c
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@@ -3117,11 +3117,19 @@ 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->txrx.txd_size,