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ramips: ethernet: ralink: mtu change while interface is down

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fe_change_mtu didn't update the registers if the interface was down.

DSA increases the CPU port MTU to accommodate the CPU tag. As this
happens while the CPU port was still down, the chip regs didn't get
updated and larger frames were dropped.

Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/23933
Signed-off-by: Robert Marko <robimarko@gmail.com>
This commit is contained in:
Luiz Angelo Daros de Luca
2026-06-29 14:54:58 +02:00
committed by Robert Marko
parent a24bdc2e9f
commit 84aafc08d7
1 changed files with 6 additions and 4 deletions
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target/linux/ramips/files/drivers/net/ethernet/ralink/mtk_eth_soc.c
+6 -4
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@@ -1452,10 +1452,9 @@ static int fe_change_mtu(struct net_device *dev, int new_mtu)
priv->rx_ring.frag_size = PAGE_SIZE;
priv->rx_ring.rx_buf_size = fe_max_buf_size(priv->rx_ring.frag_size);
if (!netif_running(dev))
return 0;
if (netif_running(dev))
fe_stop(dev);
fe_stop(dev);
if (!IS_ENABLED(CONFIG_SOC_MT7621)) {
fwd_cfg = fe_r32(DMA_FWD_REG);
if (new_mtu <= ETH_DATA_LEN) {
@@ -1469,7 +1468,10 @@ static int fe_change_mtu(struct net_device *dev, int new_mtu)
fe_w32(fwd_cfg, DMA_FWD_REG);
}
return fe_open(dev);
if (netif_running(dev))
return fe_open(dev);
return 0;
}
static const struct net_device_ops fe_netdev_ops = {